[Dnsmasq-discuss] dnsmasq ignoring some clients

[Chris Marget]

Greetings,


I've been happily using dnsmasq 2.33 for some time.  It came bundled
with the openwrt distribution running on my Linksys router.

Happily, that is, until I started trying to use it to serve some virtual
servers.  It's still serving up adresses to everything else, but is
ignoring the requests from my virtual servers.

Nothing is logged to syslog or to stdout with the -d flag.

I've compared packet dumps of lots of different clients, and found lots
of differences between them, so nothing jumps out at me as THE
difference.

Following is my dnsmasq.conf, and following that is a sample DHCP
packet, received on eth0.  Is there something wrong with the request?
Can I tweak dnsmasq to service this request?

Thanks very much for any assistance.

/chris

------------- dnsmasq.conf -------------
domain-needed
bogus-priv
filterwin2k
localise-queries

local=/lan/
domain=lan
expand-hosts
no-negcache
resolv-file=/tmp/resolv.conf.auto

log-queries
dhcp-authoritative
dhcp-range=eth0,192.168.1.101,192.168.1.150,255.255.255.0,24h
dhcp-range=eth2,172.16.1.101,172.16.1.150,255.255.255.0,24h
dhcp-leasefile=/tmp/dhcp.leases

dhcp-option=eth0,3,192.168.1.1
dhcp-option=eth2,3,172.16.1.1
dhcp-option=eth0,6,192.168.1.1
dhcp-option=eth2,6,172.16.1.1
dhcp-option=eth0,42,time.nist.gov
dhcp-option=eth2,42,time.nist.gov

read-ethers
------------- dnsmasq.conf -------------

-------------- the packet --------------
Ethernet II, Src: Xensourc_11:11:11 (00:16:3e:11:11:11), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        Address: Broadcast (ff:ff:ff:ff:ff:ff)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
    Source: Xensourc_11:11:11 (00:16:3e:11:11:11)
        Address: Xensourc_11:11:11 (00:16:3e:11:11:11)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 576
    Identification: 0x0000 (0)
    Flags: 0x04 (Don't Fragment)
        0... = Reserved bit: Not set
        .1.. = Don't fragment: Set
        ..0. = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: UDP (0x11)
    Header checksum: 0x38ae [correct]
        [Good: True]
        [Bad : False]
    Source: 0.0.0.0 (0.0.0.0)
    Destination: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Source port: bootpc (68)
    Destination port: bootps (67)
    Length: 556
    Checksum: 0x0000 (none)
        Good Checksum: False
        Bad Checksum: False
Bootstrap Protocol
    Message type: Boot Request (1)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x2bb26297
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    Client IP address: 0.0.0.0 (0.0.0.0)
    Your (client) IP address: 255.255.255.255 (255.255.255.255)
    Next server IP address: 255.255.255.255 (255.255.255.255)
    Relay agent IP address: 0.0.0.0 (0.0.0.0)
    Client MAC address: Xensourc_11:11:11 (00:16:3e:11:11:11)
    Server host name not given
    Boot file name not given
    Magic cookie: (OK)
    Option: (t=53,l=1) DHCP Message Type = DHCP Request
        Option: (53) DHCP Message Type
        Length: 1
        Value: 03
    Option: (t=54,l=4) Server Identifier = 1.2.3.4
        Option: (54) Server Identifier
        Length: 4
        Value: 01020304
    Option: (t=50,l=4) Requested IP Address = 255.255.255.255
        Option: (50) Requested IP Address
        Length: 4
        Value: FFFFFFFF
    Option: (t=55,l=7) Parameter Request List
        Option: (55) Parameter Request List
        Length: 7
        Value: 0103060C0F1128
        1 = Subnet Mask
        3 = Router
        6 = Domain Name Server
        12 = Host Name
        15 = Domain Name
        17 = Root Path
        40 = Network Information Service Domain
    End Option
    Padding
-------------- the packet --------------