invalid DISCOVER packet - update

Duane Cox duanec at mail.illicom.net
Fri Apr 6 19:05:21 UTC 2007


What I initially thought was an invalid discover packet turns out to not be
the case.
Other dhcp servers respond to the packet just fine, as well as does the ISC
server (using a bare bones config).

So what I found out was if I removed the "failover peer" declaration, then
the server sends out an OFFER.
If the failover peer exists in the config, then it does not.

I have never had any problem with DISCOVERS before, and I've been running
this failover peer setup for a VERY long time.

If I post some configs, could somebody help me out?

Thanks
Duane Cox


----- Original Message ----- 
From: "Duane Cox" <duanec at mail.illicom.net>
To: <dhcp-users at isc.org>
Sent: Thursday, April 05, 2007 3:19 PM
Subject: invalid DISCOVER packet


> Hello List, please HELP!
>
> Can someone tell me what is wrong with this discover packet?  There must
be
> something either invaid or not exactly RFC spec.
> When this packet hits my dhcp-relay agent (not ISC) it gets disreguarded
or
> dropped.
> When this packet hits the dhcp server (ISC), the server doesn't respond,
> instead logs "peer holds all free leases" BUT PEER DOES NOT, other
discovers
> work just fine....
>
> 00:1b:0c:90:70:3e > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length
618:
> IP (tos 0x0, ttl 255, id 339, offset 0, flags [none], length: 604)
> 0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from
> 00:1b:0c:90:70:3e, length: 576, xid:0x24d1, flags: [Broadcast] (0x8000)
>           Client Ethernet Address: 00:1b:0c:90:70:3e
>           Vendor-rfc1048:
>             DHCP:DISCOVER
>             MSZ:1152
>             CID:"cisco-001b.0c90.703e-Fa0"
>             HN:"Clarkip"
>             PR:SM+NS+DN+WNS+DG+SR+T150+VO
>         0x0000:  4500 025c 0153 0000 ff11 b83e 0000 0000  E..\.S.....>....
>         0x0010:  ffff ffff 0044 0043 0248 d35a 0101 0600  .....D.C.H.Z....
>         0x0020:  0000 24d1 0000 8000 0000 0000 0000 0000  ..$.............
>         0x0030:  0000 0000 0000 0000 001b 0c90 703e 0000  ............p>..
>         0x0040:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0050:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0060:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0070:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0080:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0090:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x00a0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x00b0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x00c0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x00d0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x00e0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x00f0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0100:  0000 0000 0000 0000 6382 5363 3501 0139  ........c.Sc5..9
>         0x0110:  0204 803d 1900 6369 7363 6f2d 3030 3162  ...=..cisco-001b
>         0x0120:  2e30 6339 302e 3730 3365 2d46 6130 0c07  .0c90.703e-Fa0..
>         0x0130:  436c 6172 6b69 7037 0801 060f 2c03 2196  Clarkip7....,.!.
>         0x0140:  2bff 0000 0000 0000 0000 0000 0000 0000  +...............
>         0x0150:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0160:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0170:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0180:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0190:  0000 0000 0000 0000 0000 0000 0000 0000  ...............
>         0x01a0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x01b0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x01c0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x01d0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x01e0:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x01f0:  0000 0000 0000 0000 0000 0000 0000 0000  ...............
>         0x0200:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0210:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0220:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0230:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0240:  0000 0000 0000 0000 0000 0000 0000 0000  ................
>         0x0250:  0000 0000 0000 0000 0000 0000            ............
>
>
>
>
>



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