On 06/12/2012 05:51, Olivier Nicole wrote:
> I used netstat -i for the first time and I saw something I cannot
> understand:
>
> # netstat -ibh -I em1
> Name Mtu Network Address Ipkts Opkts
> em1 9000 <Link#2> 00:0e:0c:5c:32:29 92M 129M
> em1 9000 10.41.170/24 ufo2000 924K 926K
>
> I understand that the line reporting MAc address means the traffic
> seen at layer2, while the line reporting IP address means the traffic
> seen at layer3.
>
> How would that be possible to have suh a difference (on a switched
> network)?
It's certainly possible -- arp (and dhcp to some extent) involve sending
broadcast packets at layer 2. There can be a lot of arp traffic on a
well-populated network, or if you're going things like running multiple
layer 3 networks over the same physical infrastructure. There can be
other forms of Ethernet-only (rather than IP traffic) -- switches often
speak to each other like that. Generally it is not a problem unless it
is affecting performance, at which point the answer is to segment the
network into smaller broadcast domains by sub-netting and/or using VLANs.
Cheers,
Matthew
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