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[suse-security] iptables question

I am running Suse 7.3 / 2.4.16  / Susefirewall2
for my cablemodem connection I was recommended mtu1472 on eth0
and add the following line:

iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS 

If I stop the firewall and start it up again do I have to add the line above 
again or is this a permanent thing?
what command can I use to see the iptable configuration?

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