Weird network problem

[Mikkel L. Ellertson]

On 05/25/2013 08:00 PM, Phil Dobbin wrote:
> Hi, all.
>
> I've got several machines on a LAN behind a NAT with DHCP assigning
> always the same addresses from a dynamic IP.
>
> A couple of days ago the IP changed & since then, one of the machines
> running Fedora 17 always fails first time to connect to the network:
> launch Thunderbird, no start screen, first attempt to check mail, it
> tells me that there's no network connection, second attempt it connects.
>
> The scheduled DejaDup backup always fails with no network but will run
> manually no problem. Firefox can't find Google but the Nagios
> web interface is fine as is all the cli stuff (ping, ssh, etc).
>
> Most annoyingly, yum update goes through every mirror before partially
> downloading part of the updates & if the updates are large, it takes
> about three attempts to get them all installed.
>
> I'd like to clear this up naturally especially as in the next couple of
> weeks I'll be upgrading this box to Fedora 18 & the last thing I need is
> a dodgy network connection.
>
> All the machines below are on the same LAN & they all work fine after
> the IP address change, it's only the Fedora box that's causing problems.
>
> Any help appreciated. I'm stuck.
>
> Cheers,
>
>   Phil...
>
Check your name server settings. Does /etc/resolv.conf have a name
server that from the old IP address? Do you have one machine on the
network that runs a catching name server and the rest of the Fedora
machines are looking for it at the old address? Or are you running
something like dnsmasq on the machines, and have the old IP address
in the config file?

Mikkel
-- 
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