DHCP reject to listen to single interface

[Chris Buxton]

On Jan 7, 2013, at 8:02 PM, Yaroslav Molochko wrote:

> I have simple configuration of the DHCP server. 

[cut]

> Then I configure Dlink DES-3200 series switch to be my DHCP Relay. And here is what I see in tcpdump output:
> ====
>     10.75.0.146.68 > 10.75.0.252.67: [udp sum ok] BOOTP/DHCP, Request from 8c:89:a5:13:bf:f0, length 324, hops 1, xid 0x50c40ccf, secs 3328, Flags [none] (0x0000)

[cut]

> and here DHCP server rejects requests:
> ====
> 05:42:26.633369 IP (tos 0xc0, ttl 64, id 30699, offset 0, flags [none], proto ICMP (1), length 380)
>     10.75.0.252 > 10.75.0.146: ICMP 10.75.0.252 udp port 67 unreachable, length 360
> 	IP (tos 0x0, ttl 128, id 16204, offset 0, flags [none], proto UDP (17), length 352)
> ====
> 
> I've checked out my firewall:
> ====
>  iptables -nvL
> Chain INPUT (policy ACCEPT 395 packets, 35787 bytes)
>  pkts bytes target     prot opt in     out     source               destination         

Is the server listening on UDP port 67?

If this is Linux, you can probably find out with this command (as root):

lsof -i:67

If not, is dhcpd running at all? Again, for Linux:

ps ax | grep dhcpd | grep -v grep

Chris Buxton
BlueCat Networks
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