dhcpd doesn't acknowledge dhcp requests

[Graham Clinch]

> I have a dhcp server that won't give out leases and doesn't acknowledge 
> DHCPDISCOVERs.
> 
> I see the requests come in with tcpdump, but the daemon doesn't log them 
> and doesn't respond.
>
> [snip]
>
>  >ss -anlp | grep ':67'
> tcp    UNCONN     0      0 *:67                    *:* 
> users:(("dhcpd",21614,9))

Is the daemon listening on interface em2?

# ss -anp | grep dhcpd
p_raw  UNCONN     0      0                      *:eth0                   *      users:(("dhcpd",24985,5))
[...]

Alternatively, running the daemon manually in debug mode (-d) should give some hints as to the interfaces it's discovered:

Listening on LPF/eth0/00:14:22:28:ad:83/192.168.125.0/24
Sending on   LPF/eth0/00:14:22:28:ad:83/192.168.125.0/24
Sending on   Socket/fallback/fallback-net

Graham