• [gentoo-user] Expand host name for all subdomains except primary domain

    From whiteman808@21:1/5 to All on Mon May 19 14:40:01 2025
    Hello,

    I'm configuring dnsmasq for virtual machines and have no idea how can I configure dnsmasq to exclude primary domain name from expanding its
    name.

    I have a domain rpk.lan, which is the PC running VMs, and virtual
    machines have set accordingly following domains: vm1.rpk.lan,
    vm2.rpk.lan and so on.

    For testing purposes I ran the Gentoo livecd. When I issue ping livecd
    in the minimal Gentoo install iso name livecd was properly expanded to livecd.rpk.lan, but when I type ping rpk name is expanded to
    rpk.rpk.lan, not rpk.lan as I want.

    On the host side rpk.lan is properly resolved as 192.168.122.1, which is
    the IP of the computer managing VMs.

    I tried to change domain=rpk.lan to domain=rpk.lan,192.168.122.2,192.168.122.254,
    but still pinging rpk in VM resulted in answers to rpk.rpk.lan, not rpk.lan.

    How can I tell dnsmasq to expand host name for all names bound to
    address range from 192.168.122.2 to 192.168.122.254 except
    192.168.122.1, which is the rpk.lan?

    I included /etc/dnsmasq.conf contents in attachment.

    Thanks, whiteman808 :-)

    # Configuration file for dnsmasq.
    #
    # Format is one option per line, legal options are the same
    # as the long options legal on the command line. See
    # "/usr/sbin/dnsmasq --help" or "man 8 dnsmasq" for details.

    # Listen on this specific port instead of the standard DNS port
    # (53). Setting this to zero completely disables DNS function,
    # leaving only DHCP and/or TFTP.
    #port=5353

    # The following two options make you a better netizen, since they
    # tell dnsmasq to filter out queries which the public DNS cannot
    # answer, and which load the servers (especially the root servers)
    # unnecessarily. If you have a dial-on-demand link they also stop
    # these requests from bringing up the link unnecessarily.

    # Never forward plain names (without a dot or domain part)
    domain-needed
    # Never forward addresses in the non-routed address spaces.
    bogus-priv

    # Uncomment these to enable DNSSEC validation and caching:
    # (Requires dnsmasq to be built with DNSSEC option.) #conf-file=/usr/share/dnsmasq/trust-anchors.conf
    #dnssec

    # Replies which are not DNSSEC signed may be legitimate, because the domain
    # is unsigned, or may be forgeries. Setting this option tells dnsmasq to
    # check that an unsigned reply is OK, by finding a secure proof that a DS
    # record somewhere between the root and the domain does not exist.
    # The cost of setting this is that even queries in unsigned domains will need
    # one or more extra DNS queries to verify.
    #dnssec-check-unsigned

    # Uncomment this to filter useless windows-originated DNS requests
    # which can trigger dial-on-demand links needlessly.
    # Note that (amongst other things) this blocks all SRV requests,
    # so don't use it if you use eg Kerberos, SIP, XMMP or Google-talk.
    # This option only affects forwarding, SRV records originating for
    # dnsmasq (via srv-host= lines) are not suppressed by it.
    #filterwin2k

    # Change this line if you want dns to get its upstream servers from
    # somewhere other that /etc/resolv.conf
    #resolv-file=

    # By default, dnsmasq will send queries to any of the upstream
    # servers it knows about and tries to favour servers to are known
    # to be up. Uncommenting this forces dnsmasq to try each query
    # with each server strictly in the order they appear in
    # /etc/resolv.conf
    #strict-order

    # If you don't want dnsmasq to read /etc/resolv.conf or any other
    # file, getting its servers from this file instead (see below), then
    # uncomment this.
    no-resolv

    # If you don't want dnsmasq to poll /etc/resolv.conf or other resolv
    # files for changes and re-read them then uncomment this.
    no-poll

    # Add other name servers here, with domain specs if they are for
    # non-public domains.
    #server=/localnet/192.168.0.1
    server=/lan/192.168.0.1
    server=1.1.1.1
    server=1.0.0.1

    # Example of routing PTR queries to nameservers: this will send all
    # address->name queries for 192.168.3/24 to nameserver 10.1.2.3 #server=/3.168.192.in-addr.arpa/10.1.2.3

    # Add local-only domains here, queries in these domains are answered
    # from /etc/hosts or DHCP only.
    #local=/localnet/

    # Add domains which you want to force to an IP address here.
    # The example below send any host in double-click.net to a local
    # web-server.
    #address=/double-click.net/127.0.0.1
    address=/rpk.lan/192.168.122.1

    # --address (and --server) work with IPv6 addresses too. #address=/www.thekelleys.org.uk/fe80::20d:60ff:fe36:f83

    # Add the IPs of all queries to yahoo.com, google.com, and their
    # subdomains to the vpn and search ipsets: #ipset=/yahoo.com/google.com/vpn,search

    # Add the IPs of all queries to yahoo.com, google.com, and their
    # subdomains to netfilters sets, which is equivalent to
    # 'nft add element ip test vpn { ... }; nft add element ip test search { ... }' #nftset=/yahoo.com/google.com/ip#test#vpn,ip#test#search

    # Use netfilters sets for both IPv4 and IPv6:
    # This adds all addresses in *.yahoo.com to vpn4 and vpn6 for IPv4 and IPv6 addresses.
    #nftset=/yahoo.com/4#ip#test#vpn4
    #nftset=/yahoo.com/6#ip#test#vpn6

    # You can control how dnsmasq talks to a server: this forces
    # queries to 10.1.2.3 to be routed via eth1
    # server=10.1.2.3@eth1

    # and this sets the source (ie local) address used to talk to
    # 10.1.2.3 to 192.168.1.1 port 55 (there must be an interface with that
    # IP on the machine, obviously).
    # server=10.1.2.3@192.168.1.1#55

    # If you want dnsmasq to change uid and gid to something other
    # than the default, edit the following lines.
    #user=
    #group=

    # If you want dnsmasq to listen for DHCP and DNS requests only on
    # specified interfaces (and the loopback) give the name of the
    # interface (eg eth0) here.
    # Repeat the line for more than one interface.
    #interface=
    # Or you can specify which interface _not_ to listen on
    #except-interface=
    # Or which to listen on by address (remember to include 127.0.0.1 if
    # you use this.)
    listen-address=::1,127.0.0.1,192.168.122.1
    # If you want dnsmasq to provide only DNS service on an interface,
    # configure it as shown above, and then use the following line to
    # disable DHCP and TFTP on it.
    #no-dhcp-interface=

    # On systems which support it, dnsmasq binds the wildcard address,
    # even when it is listening on only some interfaces. It then discards
    # requests that it shouldn't reply to. This has the advantage of
    # working even when interfaces come and go and change address. If you
    # want dnsmasq to really bind only the interfaces it is listening on,
    # uncomment this option. About the only time you may need this is when
    # running another nameserver on the same machine.
    #bind-interfaces

    # If you don't want dnsmasq to read /etc/hosts, uncomment the
    # following line.
    no-hosts
    # or if you want it to read another file, as well as /etc/hosts, use
    # this.
    #addn-hosts=/etc/banner_add_hosts

    # Set this (and domain: see below) if you want to have a domain
    # automatically added to simple names in a hosts-file.
    expand-hosts

    # Set the domain for dnsmasq. this is optional, but if it is set, it
    # does the following things.
    # 1) Allows DHCP hosts to have fully qualified domain names, as long
    # as the domain part matches this setting.
    # 2) Sets the "domain" DHCP option thereby potentially setting the
    # domain of all systems configured by DHCP
    # 3) Provides the domain part for "expand-hosts"
    domain=rpk.lan

    # Set a different domain for a particular subnet #domain=wireless.thekelleys.org.uk,192.168.2.0/24

    # Same idea, but range rather then subnet #domain=reserved.thekelleys.org.uk,192.68.3.100,192.168.3.200

    # Uncomment this to enable the integrated DHCP server, you need
    # to supply the range of addresses available for lease and optionally
    # a lease time. If you have more than one network, you will need to
    # repeat this for each network on which you want to supply DHCP
    # service.
    #dhcp-range=192.168.0.50,192.168.0.150,12h

    # This is an example of a DHCP range where the netmask is given. This
    # is needed for networks we reach the dnsmasq DHCP server via a relay
    # agent. If you don't know what a DHCP relay agent is, you probably
    # don't need to worry about this. dhcp-range=192.168.122.2,192.168.122.254,255.255.255.0,12h

    # This is an example of a DHCP range which sets a tag, so that
    # some DHCP options may be set only for this network. #dhcp-range=set:red,192.168.0.50,192.168.0.150

    # Use this DHCP range only when the tag "green" is set. #dhcp-range=tag:green,192.168.0.50,192.168.0.150,12h

    # Specify a subnet which can't be used for dynamic address allocation,
    # is available for hosts with matching --dhcp-host lines. Note that
    # dhcp-host declarations will be ignored unless there is a dhcp-range
    # of some type for the subnet in question.
    # In this case the netmask is implied (it comes from the network
    # configuration on the machine running dnsmasq) it is possible to give
    # an explicit netmask instead.
    #dhcp-range=192.168.0.0,static

    # Enable DHCPv6. Note that the prefix-length does not need to be specified
    # and defaults to 64 if missing/
    #dhcp-range=1234::2, 1234::500, 64, 12h

    # Do Router Advertisements, BUT NOT DHCP for this subnet.
    #dhcp-range=1234::, ra-only

    # Do Router Advertisements, BUT NOT DHCP for this subnet, also try and
    # add names to the DNS for the IPv6 address of SLAAC-configured dual-stack
    # hosts. Use the DHCPv4 lease to derive the name, network segment and
    # MAC address and assume that the host will also have an
    # IPv6 address calculated using the SLAAC algorithm.
    #dhcp-range=1234::, ra-names

    # Do Router Advertisements, BUT NOT DHCP for this subnet.
    # Set the lifetime to 46 hours. (Note: minimum lifetime is 2 hours.) #dhcp-range=1234::, ra-only, 48h

    # Do DHCP and Router Advertisements for this subnet. Set the A bit in the RA
    # so that clients can use SLAAC addresses as well as DHCP ones. #dhcp-range=1234::2, 1234::500, slaac

    # Do Router Advertisements and stateless DHCP for this subnet. Clients will
    # not get addresses from DHCP, but they will get other configuration information.
    # They will use SLAAC for addresses.
    #dhcp-range=1234::, ra-stateless

    # Do stateless DHCP, SLAAC, and generate DNS names for SLAAC addresses
    # from DHCPv4 leases.
    #dhcp-range=1234::, ra-stateless, ra-names

    # Do router advertisements for all subnets where we're doing DHCPv6
    # Unless overridden by ra-stateless, ra-names, et al, the router
    # advertisements will have the M and O bits set, so that the clients
    # get addresses and configuration from DHCPv6, and the A bit reset, so the
    # clients don't use SLAAC addresses.
    enable-ra

    # Supply parameters for specified hosts using DHCP. There are lots
    # of valid alternatives, so we will give examples of each. Note that
    # IP addresses DO NOT have to be in the range given above, they just
    # need to be on the same network. The order of the parameters in these
    # do not matter, it's permissible to give name, address and MAC in any
    # order.

    # Always allocate the host with Ethernet address 11:22:33:44:55:66
    # The IP address 192.168.0.60
    #dhcp-host=11:22:33:44:55:66,192.168.0.60

    # Always set the name of the host with hardware address
    # 11:22:33:44:55:66 to be "fred"
    #dhcp-host=11:22:33:44:55:66,fred

    # Always give the host with Ethernet address 11:22:33:44:55:66
    # the name fred and IP address 192.168.0.60 and lease time 45 minutes #dhcp-host=11:22:33:44:55:66,fred,192.168.0.60,45m

    # Give a host with Ethernet address 11:22:33:44:55:66 or
    # 12:34:56:78:90:12 the IP address 192.168.0.60. Dnsmasq will assume
    # that these two Ethernet interfaces will never be in use at the same
    # time, and give the IP address to the second, even if it is already
    # in use by the first. Useful for laptops with wired and wireless
    # addresses.
    #dhcp-host=11:22:33:44:55:66,12:34:56:78:90:12,192.168.0.60

    # Give the machine which says its name is "bert" IP address
    # 192.168.0.70 and an infinite lease
    #dhcp-host=bert,192.168.0.70,infinite

    # Always give the host with client identifier 01:02:02:04
    # the IP address 192.168.0.60
    #dhcp-host=id:01:02:02:04,192.168.0.60

    # Always give the InfiniBand interface with hardware address
    # 80:00:00:48:fe:80:00:00:00:00:00:00:f4:52:14:03:00:28:05:81 the
    # ip address 192.168.0.61. The client id is derived from the prefix
    # ff:00:00:00:00:00:02:00:00:02:c9:00 and the last 8 pairs of
    # hex digits of the hardware address. #dhcp-host=id:ff:00:00:00:00:00:02:00:00:02:c9:00:f4:52:14:03:00:28:05:81,192.168.0.61

    # Always give the host with client identifier "marjorie"
    # the IP address 192.168.0.60
    #dhcp-host=id:marjorie,192.168.0.60

    # Enable the address given for "judge" in /etc/hosts
    # to be given to a machine presenting the name "judge" when
    # it asks for a DHCP lease.
    #dhcp-host=judge

    # Never offer DHCP service to a machine whose Ethernet
    # address is 11:22:33:44:55:66
    #dhcp-host=11:22:33:44:55:66,ignore

    # Ignore any client-id presented by the machine with Ethernet
    # address 11:22:33:44:55:66. This is useful to prevent a machine
    # being treated differently when running under different OS's or
    # between PXE boot and OS boot.
    #dhcp-host=11:22:33:44:55:66,id:*

    # Send extra options which are tagged as "red" to
    # the machine with Ethernet address 11:22:33:44:55:66 #dhcp-host=11:22:33:44:55:66,set:red

    # Send extra options which are tagged as "red" to
    # any machine with Ethernet address starting 11:22:33: #dhcp-host=11:22:33:*:*:*,set:red

    # Give a fixed IPv6 address and name to client with
    # DUID 00:01:00:01:16:d2:83:fc:92:d4:19:e2:d8:b2
    # Note the MAC addresses CANNOT be used to identify DHCPv6 clients.
    # Note also that the [] around the IPv6 address are obligatory. #dhcp-host=id:00:01:00:01:16:d2:83:fc:92:d4:19:e2:d8:b2, fred, [1234::5]

    # Ignore any clients which are not specified in dhcp-host lines
    # or /etc/ethers. Equivalent to ISC "deny unknown-clients".
    # This relies on the special "known" tag which is set when
    # a host is matched.
    #dhcp-ignore=tag:!known

    # Send extra options which are tagged as "red" to any machine whose
    # DHCP vendorclass string includes the substring "Linux" #dhcp-vendorclass=set:red,Linux

    # Send extra options which are tagged as "red" to any machine one
    # of whose DHCP userclass strings includes the substring "accounts" #dhcp-userclass=set:red,accounts

    # Send extra options which are tagged as "red" to any machine whose
    # MAC address matches the pattern.
    #dhcp-mac=set:red,00:60:8C:*:*:*

    # If this line is uncommented, dnsmasq will read /etc/ethers and act
    # on the ethernet-address/IP pairs found there just as if they had
    # been given as --dhcp-host options. Useful if you keep
    # MAC-address/host mappings there for other purposes.
    #read-ethers

    # Send options to hosts which ask for a DHCP lease.
    # See RFC 2132 for details of available options.
    # Common options can be given to dnsmasq by name:
    # run "dnsmasq --help dhcp" to get a list.
    # Note that all the common settings, such as netmask and
    # broadcast address, DNS server and default route, are given
    # sane defaults by dnsmasq. You very likely will not need
    # any dhcp-options. If you use Windows clients and Samba, there
    # are some options which are recommended, they are detailed at the
    # end of this section.

    # Override the default route supplied by dnsmasq, which assumes the
    # router is the same machine as the one running dnsmasq.
    #dhcp-option=3,1.2.3.4

    # Do the same thing, but using the option name #dhcp-option=option:router,1.2.3.4

    # Override the default route supplied by dnsmasq and send no default
    # route at all. Note that this only works for the options sent by
    # default (1, 3, 6, 12, 28) the same line will send a zero-length option
    # for all other option numbers.
    #dhcp-option=3

    # Set the NTP time server addresses to 192.168.0.4 and 10.10.0.5 #dhcp-option=option:ntp-server,192.168.0.4,10.10.0.5

    # Send DHCPv6 option. Note [] around IPv6 addresses. #dhcp-option=option6:dns-server,[1234::77],[1234::88]

    # Send DHCPv6 option for namservers as the machine running
    # dnsmasq and another.
    #dhcp-option=option6:dns-server,[::],[1234::88]

    # Ask client to poll for option changes every six hours. (RFC4242) #dhcp-option=option6:information-refresh-time,6h

    # Set option 58 client renewal time (T1). Defaults to half of the
    # lease time if not specified. (RFC2132)
    #dhcp-option=option:T1,1m

    # Set option 59 rebinding time (T2). Defaults to 7/8 of the
    # lease time if not specified. (RFC2132)
    #dhcp-option=option:T2,2m

    # Set the NTP time server address to be the same machine as
    # is running dnsmasq
    #dhcp-option=42,0.0.0.0

    # Set the NIS domain name to "welly"
    #dhcp-option=40,welly

    # Set the default time-to-live to 50
    #dhcp-option=23,50

    # Set the "all subnets are local" flag
    #dhcp-option=27,1

    # Send the etherboot magic flag and then etherboot options (a string). #dhcp-option=128,e4:45:74:68:00:00
    #dhcp-option=129,NIC=eepro100

    # Specify an option which will only be sent to the "red" network
    # (see dhcp-range for the declaration of the "red" network)
    # Note that the tag: part must precede the option: part.
    #dhcp-option = tag:red, option:ntp-server, 192.168.1.1

    # The following DHCP options set up dnsmasq in the same way as is specified
    # for the ISC dhcpcd in
    # https://web.archive.org/web/20040313070105/http://us1.samba.org/samba/ftp/docs/textdocs/DHCP-Server-Configuration.txt
    # adapted for a typical dnsmasq installation where the host running
    # dnsmasq is also the host running samba.
    # you may want to uncomment some or all of them if you use
    # Windows clients and Samba.
    #dhcp-option=19,0 # option ip-forwarding off
    #dhcp-option=44,0.0.0.0 # set netbios-over-TCP/IP nameserver(s) aka WINS server(s)
    #dhcp-option=45,0.0.0.0 # netbios datagram distribution server #dhcp-option=46,8 # netbios node type

    # Send an empty WPAD option. This may be REQUIRED to get windows 7 to behave. #dhcp-option=252,"\n"

    # Send RFC-3397 DNS domain search DHCP option. WARNING: Your DHCP client
    # probably doesn't support this...... #dhcp-option=option:domain-search,eng.apple.com,marketing.apple.com

    # Send RFC-3442 classless static routes (note the netmask encoding) #dhcp-option=121,192.168.1.0/24,1.2.3.4,10.0.0.0/8,5.6.7.8

    # Send vendor-class specific options encapsulated in DHCP option 43.
    # The meaning of the options is defined by the vendor-class so
    # options are sent only when the client supplied vendor class
    # matches the class given here. (A substring match is OK, so "MSFT"
    # matches "MSFT" and "MSFT 5.0"). This example sets the
    # mtftp address to 0.0.0.0 for PXEClients. #dhcp-option=vendor:PXEClient,1,0.0.0.0

    # Send microsoft-specific option to tell windows to release the DHCP lease
    # when it shuts down. Note the "i" flag, to tell dnsmasq to send the
    # value as a four-byte integer - that's what microsoft wants. See
    # http://technet2.microsoft.com/WindowsServer/en/library/a70f1bb7-d2d4-49f0-96d6-4b7414ecfaae1033.mspx?mfr=true
    #dhcp-option=vendor:MSFT,2,1i

    # Send the Encapsulated-vendor-class ID needed by some configurations of
    # Etherboot to allow is to recognise the DHCP server. #dhcp-option=vendor:Etherboot,60,"Etherboot"

    # Send options to PXELinux. Note that we need to send the options even
    # though they don't appear in the parameter request list, so we need
    # to use dhcp-option-force here.
    # See http://syslinux.zytor.com/pxe.php#special for details.
    # Magic number - needed before anything else is recognised #dhcp-option-force=208,f1:00:74:7e
    # Configuration file name
    #dhcp-option-force=209,configs/common
    # Path prefix
    #dhcp-option-force=210,/tftpboot/pxelinux/files/
    # Reboot time. (Note 'i' to send 32-bit value)
    #dhcp-option-force=211,30i

    # Set the boot filename for netboot/PXE. You will only need
    # this if you want to boot machines over the network and you will need
    # a TFTP server; either dnsmasq's built-in TFTP server or an
    # external one. (See below for how to enable the TFTP server.) #dhcp-boot=pxelinux.0

    # The same as above, but use custom tftp-server instead machine running dnsmasq #dhcp-boot=pxelinux,server.name,192.168.1.100

    # Boot for iPXE. The idea is to send two different
    # filenames, the first loads iPXE, and the second tells iPXE what to
    # load. The dhcp-match sets the ipxe tag for requests from iPXE. #dhcp-boot=undionly.kpxe
    #dhcp-match=set:ipxe,175 # iPXE sends a 175 option. #dhcp-boot=tag:ipxe,http://boot.ipxe.org/demo/boot.php

    # Encapsulated options for iPXE. All the options are
    # encapsulated within option 175
    #dhcp-option=encap:175, 1, 5b # priority code
    #dhcp-option=encap:175, 176, 1b # no-proxydhcp
    #dhcp-option=encap:175, 177, string # bus-id
    #dhcp-option=encap:175, 189, 1b # BIOS drive code
    #dhcp-option=encap:175, 190, user # iSCSI username
    #dhcp-option=encap:175, 191, pass # iSCSI password

    # Test for the architecture of a netboot client. PXE clients are
    # supposed to send their architecture as option 93. (See RFC 4578) #dhcp-match=peecees, option:client-arch, 0 #x86-32
    #dhcp-match=itanics, option:client-arch, 2 #IA64
    #dhcp-match=hammers, option:client-arch, 6 #x86-64
    #dhcp-match=mactels, option:client-arch, 7 #EFI x86-64

    # Do real PXE, rather than just booting a single file, this is an
    # alternative to dhcp-boot.
    #pxe-prompt="What system shall I netboot?"
    # or with timeout before first available action is taken:
    #pxe-prompt="Press F8 for menu.", 60

    # Available boot services. for PXE.
    #pxe-service=x86PC, "Boot from local disk"

    # Loads <tftp-root>/pxelinux.0 from dnsmasq TFTP server.
    #pxe-service=x86PC, "Install Linux", pxelinux

    # Loads <tftp-root>/pxelinux.0 from TFTP server at 1.2.3.4.
    # Beware this fails on old PXE ROMS.
    #pxe-service=x86PC, "Install Linux", pxelinux, 1.2.3.4

    # Use bootserver on network, found my multicast or broadcast. #pxe-service=x86PC, "Install windows from RIS server", 1

    # Use bootserver at a known IP address.
    #pxe-service=x86PC, "Install windows from RIS server", 1, 1.2.3.4

    # If you have multicast-FTP available,
    # information for that can be passed in a similar way using options 1
    # to 5. See page 19 of
    # http://download.intel.com/design/archives/wfm/downloads/pxespec.pdf


    # Enable dnsmasq's built-in TFTP server
    #enable-tftp

    # Set the root directory for files available via FTP.
    #tftp-root=/var/ftpd

    # Do not abort if the tftp-root is unavailable
    #tftp-no-fail

    # Make the TFTP server more secure: with this set, only files owned by
    # the user dnsmasq is running as will be send over the net.
    #tftp-secure

    # This option stops dnsmasq from negotiating a larger blocksize for TFTP
    # transfers. It will slow things down, but may rescue some broken TFTP
    # clients.
    #tftp-no-blocksize

    # Set the boot file name only when the "red" tag is set. #dhcp-boot=tag:red,pxelinux.red-net

    # An example of dhcp-boot with an external TFTP server: the name and IP
    # address of the server are given after the filename.
    # Can fail with old PXE ROMS. Overridden by --pxe-service. #dhcp-boot=/var/ftpd/pxelinux.0,boothost,192.168.0.3

    # If there are multiple external tftp servers having a same name
    # (using /etc/hosts) then that name can be specified as the
    # tftp_servername (the third option to dhcp-boot) and in that
    # case dnsmasq resolves this name and returns the resultant IP
    # addresses in round robin fashion. This facility can be used to
    # load balance the tftp load among a set of servers. #dhcp-boot=/var/ftpd/pxelinux.0,boothost,tftp_server_name

    # Set the limit on DHCP leases, the default is 150
    dhcp-lease-max=253

    # The DHCP server needs somewhere on disk to keep its lease database.
    # This defaults to a sane location, but if you want to change it, use
    # the line below.
    #dhcp-leasefile=/var/lib/misc/dnsmasq.leases

    # Set the DHCP server to authoritative mode. In this mode it will barge in
    # and take over the lease for any client which broadcasts on the network,
    # whether it has a record of the lease or not. This avoids long timeouts
    # when a machine wakes up on a new network. DO NOT enable this if there's
    # the slightest chance that you might end up accidentally configuring a DHCP
    # server for your campus/company accidentally. The ISC server uses
    # the same option, and this URL provides more information:
    # http://www.isc.org/files/auth.html
    #dhcp-authoritative

    # Set the DHCP server to enable DHCPv4 Rapid Commit Option per RFC 4039.
    # In this mode it will respond to a DHCPDISCOVER message including a Rapid Commit
    # option with a DHCPACK including a Rapid Commit option and fully committed address
    # and configuration information. This must only be enabled if either the server is
    # the only server for the subnet, or multiple servers are present and they each # commit a binding for all clients.
    #dhcp-rapid-commit

    # Run an executable when a DHCP lease is created or destroyed.
    # The arguments sent to the script are "add" or "del",
    # then the MAC address, the IP address and finally the hostname
    # if there is one.
    #dhcp-script=/bin/echo

    # Set the cachesize here.
    #cache-size=150

    # If you want to disable negative caching, uncomment this.
    #no-negcache

    # Normally responses which come from /etc/hosts and the DHCP lease
    # file have Time-To-Live set as zero, which conventionally means
    # do not cache further. If you are happy to trade lower load on the
    # server for potentially stale date, you can set a time-to-live (in
    # seconds) here.
    #local-ttl=

    # If you want dnsmasq to detect attempts by Verisign to send queries
    # to unregistered .com and .net hosts to its sitefinder service and
    # have dnsmasq instead return the correct NXDOMAIN response, uncomment
    # this line. You can add similar lines to do the same for other
    # registries which have implemented wildcard A records. #bogus-nxdomain=64.94.110.11

    # If you want to fix up DNS results from upstream servers, use the
    # alias option. This only works for IPv4.
    # This alias makes a result of 1.2.3.4 appear as 5.6.7.8
    #alias=1.2.3.4,5.6.7.8
    # and this maps 1.2.3.x to 5.6.7.x
    #alias=1.2.3.0,5.6.7.0,255.255.255.0
    # and this maps 192.168.0.10->192.168.0.40 to 10.0.0.10->10.0.0.40 #alias=192.168.0.10-192.168.0.40,10.0.0.0,255.255.255.0

    # Change these lines if you want dnsmasq to serve MX records.

    # Return an MX record named "maildomain.com" with target
    # servermachine.com and preference 50 #mx-host=maildomain.com,servermachine.com,50

    # Set the default target for MX records created using the localmx option. #mx-target=servermachine.com

    # Return an MX record pointing to the mx-target for all local
    # machines.
    #localmx

    # Return an MX record pointing to itself for all local machines.
    #selfmx

    # Change the following lines if you want dnsmasq to serve SRV
    # records. These are useful if you want to serve ldap requests for
    # Active Directory and other windows-originated DNS requests.
    # See RFC 2782.
    # You may add multiple srv-host lines.
    # The fields are <name>,<target>,<port>,<priority>,<weight>
    # If the domain part if missing from the name (so that is just has the
    # service and protocol sections) then the domain given by the domain=
    # config option is used. (Note that expand-hosts does not need to be
    # set for this to work.)

    # A SRV record sending LDAP for the example.com domain to
    # ldapserver.example.com port 389 #srv-host=_ldap._tcp.example.com,ldapserver.example.com,389

    # A SRV record sending LDAP for the example.com domain to
    # ldapserver.example.com port 389 (using domain=)
    #domain=example.com
    #srv-host=_ldap._tcp,ldapserver.example.com,389

    # Two SRV records for LDAP, each with different priorities #srv-host=_ldap._tcp.example.com,ldapserver.example.com,389,1 #srv-host=_ldap._tcp.example.com,ldapserver.example.com,389,2

    # A SRV record indicating that there is no LDAP server for the domain
    # example.com
    #srv-host=_ldap._tcp.example.com

    # The following line shows how to make dnsmasq serve an arbitrary PTR
    # record. This is useful for DNS-SD. (Note that the
    # domain-name expansion done for SRV records _does_not
    # occur for PTR records.)
    #ptr-record=_http._tcp.dns-sd-services,"New Employee Page._http._tcp.dns-sd-services"

    # Change the following lines to enable dnsmasq to serve TXT records.
    # These are used for things like SPF and zeroconf. (Note that the
    # domain-name expansion done for SRV records _does_not
    # occur for TXT records.)

    #Example SPF.
    #txt-record=example.com,"v=spf1 a -all"

    #Example zeroconf
    #txt-record=_http._tcp.example.com,name=value,paper=A4

    # Provide an alias for a "local" DNS name. Note that this _only_ works
    # for targets which are names from DHCP or /etc/hosts. Give host
    # "bert" another name, bertrand
    #cname=bertrand,bert

    # For debugging purposes, log each DNS query as it passes through
    # dnsmasq.
    #log-queries

    # Log lots of extra information about DHCP transactions.
    #log-dhcp

    # Include another lot of configuration options. #conf-file=/etc/dnsmasq.more.conf
    #conf-dir=/etc/dnsmasq.d

    # Include all the files in a directory except those ending in .bak #conf-dir=/etc/dnsmasq.d,.bak

    # Include all files in a directory which end in .conf #conf-dir=/etc/dnsmasq.d/,*.conf

    # If a DHCP client claims that its name is "wpad", ignore that.
    # This fixes a security hole. see CERT Vulnerability VU#598349 #dhcp-name-match=set:wpad-ignore,wpad
    #dhcp-ignore-names=tag:wpad-ignore

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)