DHCP OFFER issues (to relay client)

Gideon Viator ktcisg at kaplantel.net
Mon Jun 25 16:19:27 UTC 2007


What device is relaying the DHCP requests? 

Gideon Viator
IT Administrator 
Kaplan Telecommunications

-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On Behalf
Of Tim Preston
Sent: Monday, June 25, 2007 10:58 AM
To: dhcp-users at isc.org
Subject: DHCP OFFER issues (to relay client)

Hi there - I'm new to the list so I hope I'm using it right ; ) - sorry for
the length!
I'm trying to get DHCPd version 3.0 hand out IPs to hosts through a relay
client. Other DHCP servers (Windows, Cisco, HaneWin) have no problem doing
this with the exact same network config, so I figure I must be doing
something wrong with ISC DHCPd.
My config is simple:
        |                                  |
    DHCPd                 DHCP relay agent
(        ( eth0)
                               ( eth1)
                                   DHCP client
Everything can ping everything else with the DHCP client configured staticly
with a 3.11.1.x/24 address.
dhcpd.conf is even simpler:
subnet netmask {
subnet netmask {
   option routers;
   option subnet-mask;
At the Linux box, the DHCP DISCOVER is being received:
Jun 25 10:42:34 dualboot dhcpd: DHCPDISCOVER from 00:90:c8:61:1c:1e
(eum61-1c-1e) via
...and subsequently answered with a DHCP OFFER (so it says):
Jun 25 10:42:34 dualboot dhcpd: DHCPOFFER on to 00:90:c8:61:1c:1e
(eum61-1c-1e) via

However, a packet capture on the Linux switch port shows no sign of the
offers DHCPd says it's sending out; only 'discovers':


No.     Time        Source                Destination           Protocol
      1 4.688431           DHCP
DHCP Discover

      2 4.823431           DHCP
DHCP Discover

      3 4.993382           DHCP
DHCP Discover


Has anyone run across this before??






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