On 12/20/06, Asfand Yar Qazi <ayqazi@gmail.com> wrote:
On 12/20/06, Petr Pisar <xpisar@fi.muni.cz> wrote:
> On 2006-12-20, Asfand Yar Qazi <ayqazi@gmail.com> wrote:
> > On 12/20/06, Petr Pisar <xpisar@fi.muni.cz> wrote:
> >> On 2006-12-20, Asfand Yar Qazi <ayqazi@gmail.com> wrote:
> >> > I have an ipv6 tunnel on the device 'tunbt6', and another interface on
> >> > eth0 to the rest of my network.
> >> >
> >> > When I enter the following commands:
> >> >
> >> > ip6tables -N filter6
> >> > ip6tables -A filter6 -m state --state NEW -i ! tunbt6 -j ACCEPT
> >> > ip6tables -A filter6 -m state --state ESTABLISHED,RELATED -j ACCEPT
> >> > ip6tables -A filter6 -j REJECT
> >> >
> >> > ip6tables -A INPUT -j filter6
> >> > ip6tables -A FORWARD -j filter6
> >> >
> >> >
> >> > It doesn't work! I can't even ping6 the machine over eth0 from my
> >> > other computer connected to the same ethernet segment!
> >> >
> >>
> >> IP6 uses ICMP6 for link level address resolution (like IP4 uses ARP).
> >> Therefore you need to accept NEW icmp6 packets. At least some types.
> >> Read draft-ietf-v6ops-icmpv6-filtering-bcp-01.txt (can be found on IETF
> >> FTP server) for more detailes.
> >>
> >
> > I'll just let in all icmp6 packets. Now to figure out how to do that...
> >
> ip6tables -I filter6 -p icmpv6 -j ACCEPT
>
Yep, figured that out, thanks :-)
Argh - still no luck. I can now ping6 remote destinations, but I
can't, for example, establish ssh connections. I can't even ssh to
another local box over eth0!
To summarise, here's where it stands:
ip6tables -N filter6
ip6tables -A filter6 -p icmpv6 -j ACCEPT
ip6tables -A filter6 -m state --state NEW -i ! tunbt6 -j ACCEPT
ip6tables -A filter6 -m state --state ESTABLISHED,RELATED -j ACCEPT
ip6tables -A filter6 -j REJECT
ip6tables -A INPUT -j filter6
ip6tables -A FORWARD -j filter6
To force it to let me ssh around to and from my router box, I am
forced to do this:
ip6tables -N filter6
ip6tables -A filter6 -i eth0 -j ACCEPT
ip6tables -A filter6 -i lo -j ACCEPT
ip6tables -A filter6 -p icmpv6 -j ACCEPT
ip6tables -A filter6 -m state --state NEW -i ! tunbt6 -j ACCEPT
ip6tables -A filter6 -m state --state ESTABLISHED,RELATED -j ACCEPT
ip6tables -A filter6 -j REJECT
ip6tables -A INPUT -j filter6
ip6tables -A FORWARD -j filter6
Anybody know what's happening?
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