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I am working on an arch linux machine with ethernet interface eth1. I have created interface eth1:0 using ifconfig and given it a dummy hw address (00:01:02:03:04:05). When I send a UDP packet to a server application running on a remote server machine, I get back the right response. But then I see ICMP Destination Unreachable going out from the eth1:0 interface ip address. How can I mute this ICMP message? I have tried different mac addresses, setup arp cache on both client and server machines without success.

Appreciate any help and thanks in advance.

John Qualis
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I'm sort of in the same boat with others here. Its better to track down and fix the root cause. To open the port isn't it a case of simply writing the correct firewall/IPTables rule? If you just want to blow ICMP outgoing, this thread should give you a good idea,

Why not block ICMP?

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dtbnguyen
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