dhcp server logging and via text
glenn.satchell at uniq.com.au
Tue Jun 15 13:24:27 UTC 2010
On 06/15/10 23:01, Bohmer, Andre ten wrote:
> On a redhat dhcp server sporadicly fails the dhcp service, probably load
> related. Interesting to see that if there are problems, the logging
> regarding clients with problems shows an other 'via' text. Instead of the
> dhcp servers local network interface (eth0) it starts logging the ip address
> of the forwarder/relay (x.x.x.254) of the specific subnet:
> Jun 12 19:42:28 scomp1001 dhcpd: DHCPREQUEST for x.x.238.41 from
> 00:24:81:20:14:e6 (d0117465) via x.x.238.254
> Jun 12 19:42:28 scomp1001 dhcpd: DHCPACK on x.x.238.41 to 00:24:81:20:14:e6
> (d0117465) via x.x.238.254
> Jun 12 04:02:41 scomp1001 dhcpd: DHCPREQUEST for x.x.238.41 from
> 00:24:81:20:14:e6 (d0117465) via eth0
> Jun 12 04:02:41 scomp1001 dhcpd: DHCPACK on x.x.238.41 to 00:24:81:20:14:e6
> (d0117465) via eth0
> Someone has an idea what's happening here?
> Wageningen University
> The Netherlands
The device with IP x.x.238.254 is acting as a dhcp-relay. Normally this
is required when you have dhcp clients on subnets that are a different
broadcast domain to that of the server. Is this a misconfigured switch
or router perhaps?
However, this should not cause the dhcp server to exit.
If it is load related it may be that normally the server is quick enough
to process the broadcast dhcp packet, but when it is busy the router
gets there first.
what version of dhcpd are you using (hint try: dhcpd --version)? Any
3.0.x versions are out of support and an upgrade should be considered.
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