[LARTC] Re: what's wrong?

[Andrew Beverley]

On Thu, 2007-02-22 at 14:30 +0100, francesco messineo wrote:
> On 2/22/07, francesco messineo <francesco.messineo at gmail.com> wrote:
> > # iptables -t mangle -A POSTROUTING -m mark  --mark ! 0 -j ACCEPT
> >
> > iptables v1.3.3: Bad MARK value `!'
> >
> >
> > I'm puzzled, what's wrong with this syntax?
> > kernel is 2.6.15.7-ubuntu1

Not all extensions support all types of matching. Looks like MARK
doesn't support an inverse match.

If you want the same effect redirect all traffic to another chain, and
within that chain RETURN if you match a 0, and then with a subsequent
rule ACCEPT any other packets. This way if packets are MARKed 0 then
they will carry on traversing the table, otherwise they will be ACCEPTed

iptables -t mangle -A POSTROUTING -J new_chain

--

iptables -t mangle -N new_chain
iptables -t mangle -A new_chain -m mark --mark 0 -j RETURN
iptables -t mangle -A new_chain -j ACCEPT


> also tried with a 2.6.20.1 compiled from source and same result.
> I can't make also work these two rules:
> 
> 
> iptables -t mangle -A POSTROUTING -j CONNMARK --save-mark
> 
> iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark
> 
> both fail with:
> 
> iptables: Invalid argument

Looks like your iptables (or your kernel?) doesn't support CONNMARK.
What version of iptables do you have?

Andy Beverley