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Is there a way to delete all iptables rules, that relate to a given interface? I don't see any command line option for this, may be there is a shorcut bash script for this?

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I could be wrong but I don't think iptables usually keeps a record of interfaces. If you're using debian/ubuntu, /etc/network/interfaces keeps a record of interfaces and IP addresses, so maybe you could whip up a script that cross-references that? – smcg Aug 21 '12 at 15:55
@smcg it should keep it. Try iptables -L -v for detailed output. – Vladislav Rastrusny Aug 23 '12 at 17:59

Some possibilities, depending on your setup.

If you are running a quite simple structure of chains and dont to nesting and implications, use iptables-save to save your firewallset. Remove all lines with -i $if or -o $if, depending on your needs. Use grep or something. Save that ruleset, diff it to your first saved ruleset and if it's okay, load it with iptables-restore.

Alternatively - gather your rules in interface-specific chains. That way you can easily migrate or remove interfaces. And you are going speed up your firewall processing!

iptables -N fw-eth1
iptables -A FORWARD -o eth1 -j fw-eth1
iptables -A fw-eth1 --your-rules-here
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Add a rule to accept all the trafic on one interface : iptables -A INPUT -i eth0 -j ACCEPT ; iptables -A OUTPUT -o eth0 -j ACCEPT All the trafic from or to this interface is allowed.

To delete all the firewall rules (I have a doubt in reading your text), iptables -P INPUT ACCEPT ; iptables -P OUTPUT ACCEPT ; iptables -P FORWARD ACCEPT ; iptables -X : all the trafic is allowed.

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