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From: Raven on 29 May 2010 17:50
Hi all.
At the office, we have a debian server to take care of routing &
transparent proxy'ing.
I recently installed vnstat to monitor the bandwidth usage (turns out
some of the employees spent their day downloading with uTorrent, but
that's another story..) and for the last week or so I noticed that some
of the values drastically dropped.

The gateway server has two network interfaces, with eth0 connected to
the local network and eth1 to the cisco router. Iptables takes care of
the routing between them.

The local i'face seems to be fine, but eth1's data is really hard to
believe:


> root(a)dl580:/home/config# ifconfig
> eth0 Link encap:Ethernet HWaddr 00:03:47:42:5c:17
> inet addr:10.0.1.2 Bcast:10.0.1.255 Mask:255.255.255.0
> inet6 addr: fe80::203:47ff:fe42:5c17/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:31640949 errors:0 dropped:0 overruns:0 frame:0
> TX packets:18811757 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:595968566 (568.3 MiB) TX bytes:128856216 (122.8
> MiB)
>
> eth1 Link encap:Ethernet HWaddr 00:03:47:42:5c:18
> inet addr:*** Bcast:*** Mask:255.255.255.248
> inet6 addr: fe80::203:47ff:fe42:5c18/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:7700 errors:0 dropped:0 overruns:0 frame:0
> TX packets:13057486 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:2652885 (2.5 MiB) TX bytes:1146875616 (1.0 GiB)
>

Most of the traffic is inbound, so it should show up in the RX bytes for
eth1. But it doesn't..
Any clue?

-RV



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