[CentOS] how to capture packets that was forwarded

Andy Smith spookza at gmail.com
Tue Apr 16 09:04:58 UTC 2013


Hi Jaze


On 16 April 2013 09:52, Jaze Lee <jazeltq at gmail.com> wrote:

> hello,
> the topology is like this:
>
>  centos v0:eth1 <------> centos v0: eth2
>   fc00:2:3:4::1                      fc00:2:3::4
>
> i turned the packet forwarding
>

If you are talking about forwarding on Centos V0, forwarding will have no
effect here.  You appear to be trying to ping eth1 from a box somewhere on
eth2's network.
This is still classed as an input to V0 and will be handled by the INPUT
chain.

>
> ping6 -i eth2 fc00:2:3:4::1
> the output is
>
> PING fc00:2:3:4::1(fc00:2:3:4::1) from fc00:2:3::5 eth2: 56 data bytes
> >From fc00:2:3::4 icmp_seq=1 Destination unreachable: Administratively
> prohibited
> >From fc00:2:3::4 icmp_seq=2 Destination unreachable: Administratively
> prohibited
> >From fc00:2:3::4 icmp_seq=3 Destination unreachable: Administratively
> prohibited
> >From fc00:2:3::4 icmp_seq=4 Destination unreachable: Administratively
> prohibited
>

Administratively prohibited looks like a firewall issue.
Check your IPv6 firewall settings on V0

>
> why the box do not forwarding icmp packets to eth2?
> and how to set forwarding rules on centos 6.3?
> Thanks
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