When you have eliminated the impossible, whatever remains, however improbable, must be the truth —Sherlock Holmes
This stands particularly true with networking. I had an issue with our home network tonight and a rogue machine. I eliminated every option (including a stranger on our open AP) — with no avail. The rogue machine — the debian server I was using was that rogue IP. It had swapped mysteriously from static to DHCP — I’m not exactly sure how… but it did. (include is the offending section from /var/log/daemon.log). Strange!
<br />
May 12 07:17:12 localhost imapd[18488]: connect from 192.168.1.40 (192.168.1.40)<br />
May 12 07:17:12 localhost imapd[18489]: connect from 192.168.1.41 (192.168.1.41)<br />
May 12 07:17:12 localhost identd[18471]: started<br />
May 12 07:17:12 localhost identd[18471]: s_getpeername(8): Transport endpoint is not connected<br />
May 12 07:17:12 localhost identd[18471]: s_getpeername(8): Transport endpoint is not connected<br />
May 12 10:47:26 localhost dhclient: DHCPREQUEST on eth1 to 192.168.1.1 port 67<br />
May 12 10:47:26 localhost dhclient: DHCPNAK from 192.168.1.1<br />
May 12 10:47:26 localhost dhclient: DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 3<br />
May 12 10:47:27 localhost dhclient: DHCPOFFER from 192.168.1.1<br />
May 12 10:47:29 localhost dhclient: DHCPREQUEST on eth1 to 255.255.255.255 port 67<br />
May 12 10:47:29 localhost dhclient: DHCPACK from 192.168.1.1<br />
May 12 10:47:29 localhost dhclient: bound to 192.168.1.53 -- renewal in 43200 seconds.<br />
May 12 11:10:16 localhost named[9697]: listening on IPv4 interface eth1, 192.168.1.53#53<br />
May 12 11:10:16 localhost named[9697]: no longer listening on 192.168.1.40#53<br />
May 12 11:10:16 localhost named[9697]: no longer listening on 192.168.1.41#53<br />
May 12 22:47:29 localhost dhclient: DHCPREQUEST on eth1 to 192.168.1.1 port 67<br />
May 12 22:47:29 localhost dhclient: DHCPACK from 192.168.1.1<br />
May 12 22:47:30 localhost dhclient: bound to 192.168.1.53 -- renewal in 43200 seconds.<br />