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I am working on an Arch Linux machine with an ethernet interface eth1. I have created the interface eth1:0 using ifconfig and given it a dummy hardware 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 an 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 and set up an arp cache on both client and server machines without success.

Appreciate any help and thanks in advance.

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  • how do you send the UDP packet ? could you please dump here the output from the ` ip route list` command ?
    – Hanan
    Dec 20, 2011 at 10:08
  • Here's the output of ip route list - default via 192.168.100.1 dev eth1 192.168.100.0/24 dev eth1 proto kernel scope link src 192.168.100.144
    – John Qualis
    Dec 20, 2011 at 10:40
  • add more details about your ip address (as i am understand from your question both interfaces have diefferrent ip address).
    – Hanan
    Dec 20, 2011 at 17:01
  • eth1 is 92.168.100.144, eth1:0 is 192.168.100.81
    – John Qualis
    Dec 21, 2011 at 4:45
  • Is there a reason to use another interface with another MAC address for IP address in one subnet? Why you don't use the second IP address as a secondary IP address on the eth1 interface?
    – Jan Marek
    Jan 27, 2012 at 12:14

1 Answer 1

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Sound like you have a netmask mismatch on your sibinterface. Double check the netmask of your application server then ensure the same netmask is being used on the sub-interface of your Linux server.

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    They issue would not be ICMP specific.
    – Karlson
    Nov 30, 2012 at 16:04

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