Paket counters for aliased interfaces ?

Paket counters for aliased interfaces ?

[Patrick Mau]

Hello,

I would like to use IP-Aliasing to create a private network
between a few machines without buying more hardware. That's
easy, but ifconfig tells me:

eth0      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:x.x.x.x  Bcast:x.x.x.x  Mask:x.x.x.x
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:126810 errors:0 dropped:0 overruns:0 frame:1426
          TX packets:49286 errors:0 dropped:0 overruns:0 carrier:0
          collisions:15942 txqueuelen:100
          Interrupt:17

eth0:0    Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:10.1.1.1  Bcast:10.1.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:17

And here's the question:
I would like to collect statistics for eth0:0 but obviously the
pakets are only counted for the real interface. If I had enough time
and knowledge, how should I implement paket counters for aliased
interfaces ?

PS: Am I right that it isn't possible ? tcpdump doesn't 'work right'
    either.
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Re: Paket counters for aliased interfaces ?

[David Ford]

[-- Attachment #1: Type: text/plain, Size: 518 bytes --]

Patrick Mau wrote:
[...]

> And here's the question:
> I would like to collect statistics for eth0:0 but obviously the
> pakets are only counted for the real interface. If I had enough time
> and knowledge, how should I implement paket counters for aliased
> interfaces ?
>
> PS: Am I right that it isn't possible ? tcpdump doesn't 'work right'
>     either.

Correct.  "eth0" is only a label.  You need to use a userland process such as
firewalling and count the packets.  For tcpdump, specify 'src or dst ....'

-d


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