[SWLUG] Helping me debug network issue

[Curon Davies]

You're MTU (1200) is already set quite low, so maybe it's not that, but if
this fails then if could be:

ping -s 1200 -c 1 google.co.uk

Ideally the interface should work with an MTU of 1500 although routers can
be problematic, particularly when VPNs are thrown in. Could it be that the
MTU is too low and that the router isn't handling fragmentation correctly?
(or have you already tried a higher value?)

Curon

The RX errors is rather high.

On 9 January 2012 14:58, Daniel Morgan <plodski at gmail.com> wrote:

> heres the results of that:
>
>
> ping -s 512 -c 400 -f -n www.google.co.uk
> PING www-cctld.l.google.com (173.194.67.94) 512(540) bytes of data.
>
> --- www-cctld.l.google.com ping statistics ---
> 400 packets transmitted, 400 received, 0% packet loss, time 5597ms
>
>
> and my ifconfig for MTU
>
> root at daniel-debian:/etc# ifconfig
>
> eth0      Link encap:Ethernet  HWaddr 00:1a:a0:13:78:4f
>          inet addr:172.16.1.15  Bcast:172.16.3.255  Mask:255.255.252.0
>          UP BROADCAST RUNNING MULTICAST  MTU:1200  Metric:1
>          RX packets:64836 errors:1563 dropped:0 overruns:0 frame:1563
>          TX packets:52740 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:7076832 (6.7 MiB)  TX bytes:4097326 (3.9 MiB)
>          Interrupt:17
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