Ip route issues

[fedora]

On 02/02/2015 12:09 PM, Jarmo Hurri wrote:
>
> Greetings.
>
> Something changed in our work network configuration or my Linux laptop
> around Christmas. I now have serious network issues.
>
> The following happens all the time.
>
> ----------------------------------------------------------------------
> 1. I am unable to contact a server
>
> http://en.wikipedia.org/
> Browser says ERR_ADDRESS_UNREACHABLE
>
> 2. Name server works just fine
>
> [jarmo at localhost tmp]$ dig en.wikipedia.org +short
> 91.198.174.192
>
> 3. traceroute shows issues
>
> [jarmo at localhost tmp]$ traceroute en.wikipedia.org
> traceroute to en.wikipedia.org (91.198.174.192), 30 hops max, 60 byte packets
>   1  localhost.localdomain (172.16.43.148)  3004.217 ms !H  3004.195 ms !H  3004.187 ms !H
>
> 4. The problem is solved temporarily by flushing the route cache
>
> [jarmo at localhost tmp]$ ip ro get 91.198.174.192
> 91.198.174.192 via 91.198.174.192 dev em1  src 172.16.43.148
>      cache <redirected>
> [jarmo at localhost tmp]$ su -c "ip route flush cache"
> [jarmo at localhost tmp]$ ip ro get 91.198.174.192
> 91.198.174.192 via 172.16.40.1 dev em1  src 172.16.43.148
>      cache
>
> Now the address works ok for a while, but then I get connection
> problems again quite quickly.
> ----------------------------------------------------------------------
>
> I have no idea whether the problem is in my laptop or in the
> network. I have no problems in other networks. On the other hand,
> Windows machine in this network work without issues.
>
> Any ideas? I am running an up-to-date Fedora 20 with
>
> [jarmo at localhost tmp]$ uname -a
> Linux localhost.localdomain 3.17.8-200.fc20.x86_64 #1 SMP Thu Jan 8 23:26:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>
> [jarmo at localhost tmp]$ yum info iproute
> Loaded plugins: langpacks, refresh-packagekit
> Installed Packages
> Name        : iproute
> Arch        : x86_64
> Version     : 3.14.0
> Release     : 2.fc20
>
> Jarmo
>

Duplicate IP Addresses somewhere in your network?

suomi