Posted by
Sean McMurray on
Jun 03, 2015; 2:51pm
URL: http://isc-dhcp-users.193.s1.nabble.com/dhcpd-doesn-t-acknowledge-dhcp-requests-tp124p130.html
On 06/02/2015 03:40 PM, Graham Clinch wrote:
>> 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
On startup it says that it is Listening and Sending on em2. It also
lists interfaces it will ignore because there is no matching subnet
declared in dhcpd.conf.
It also says:
Sending on Socket/fallback/fallback-net
> ss -anp | grep dhcpd
p_raw UNCONN 0 0 *:em2 * users:(("dhcpd",21614,5))
u_str ESTAB 0 0 * 558943 * 559749 users:(("dhcpd",21614,2),("dhcpd",21614,1))
u_dgr UNCONN 0 0 * 558954 * 8044 users:(("dhcpd",21614,3))
raw UNCONN 0 0 *:1 *:* users:(("dhcpd",21614,4))
tcp UNCONN 0 0 *:14659 *:* users:(("dhcpd",21614,20))
tcp UNCONN 0 0 *:67 *:* users:(("dhcpd",21614,9))
tcp UNCONN 0 0 :::23465 :::* users:(("dhcpd",21614,21))
tcp LISTEN 0 1 10.64.0.104:647 *:* users:(("dhcpd",21614,11))
tcp ESTAB 0 0 10.64.0.104:647 10.64.0.112:56061 users:(("dhcpd",21614,10))
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