X11 forwarding and iptables question

[bob 295]

I recently locked down my ports using some iptables rules to DROP all INPUT 
and FORWARD packets and then accept only on certain ports.

My most of my stuff is working as expected except for X11 forwarding (ie. by 
logging in with ssh -X and running stuff like xclock).

I noticed that ports 177 and 6000:6007 are X11 related.   I opened these up on 
the INPUT chain but X11 forwarding still doesn't work.

What iptable rule should I be invoking to allow X11 forwarding?

Thanks in advance for your help.

bob
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