Application iptables rule with virtual interfaces

Question

If I have two or more network interfaces, ranging from virtual and real, as it could to set iptables rules to affect all of these interfaces?

Example: I have four interfaces, eth0, eth0:0, eth1 and loopback, I want to set the following rule:

iptables -A INPUT -i eth0 -p tcp --dport 80 -j ACCEPT

how would this rule to apply it interfaces eth0, eth0:0, eth1 and not apply it in loopback?

If the rule applies to eth0 applies in eth0:0 as well?

score 0 · Accepted Answer · answered Sep 03 '16 at 17:38

0

Regarding the iptables syntax, replace the -i eth0 with \! -i loopback to apply the rule to incoming traffic on all interfaces except loopback.

I'm 99% sure that eth0 and eth0:0 are treated as different interfaces by iptables, so any rule you wish to create needs to be applied separately to each interface.

answered Sep 03 '16 at 17:38

Jeremy Dover

318
1
6

But what if I do not specify the interface with the -i? The rule would be applied to all interfaces? – SoabTI Sep 03 '16 at 20:38
That is correct. – Jeremy Dover Sep 04 '16 at 00:42

Application iptables rule with virtual interfaces

1 Answers1