[ubuntu-uk] DNS settings resetting
clanlaw at googlemail.com
Sat Jan 16 08:45:28 GMT 2010
2010/1/15 James Tait <james.tait at wyrddreams.org>:
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> Colin Law wrote:
>>>> I have looked for clues as to why the DNS settings might be
>>>> disappearing but have not found anything logged anywhere, suggestions
>>>> as to where to look for information would be much appreciated. Or any
>>>> other ideas for that matter.
> DHCP transactions or normally logged by dhclient in /var/log/syslog.
> You should be able to grep for dhclient and see what IP address you've
> been offered and by what server. Also, NetworkManager logs the DHCP
> information it gets in the same file.
Got that, thanks, I am not sure why I did not see those when I initially looked.
>> I suppose one possibility is that when the PC asks for the lease to be
>> renewed the router is not providing the DNS correctly. That seems an
>> odd sort of fault however. It has only recently started happening.
> It sounds a bit like you may be getting a lease from a different server
> on your network. Has anything recently been added to the network that
> could be acting as a DHCP server? A new computer, router, access point?
There is just the laptop that is seeing the problem and two other
Ubuntu PCs on fixed ip addresses (plus the router). I have recently
added one of these PCs so I suppose I may have accidentally enabled a
dhcp server on it, though not sure how. I will disable dhcp in the
router and see if the laptop finds a server.
Otherwise I will wait till it fails again and see what is in the log.
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