All nework interfaces hang for seconds while one interface goes up/down

Posted by user3698377 on Server Fault See other posts from Server Fault or by user3698377
Published on 2014-06-02T07:27:12Z Indexed on 2014/06/03 3:30 UTC
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linux

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networking

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ip

I am building a client/server application that uses several network interfaces in parallel for redundancy, and I have noticed that while one network interface goes down or goes up, the communication on other interfaces hangs for several seconds.

I could reproduce this behavior without my application in a simple way:

there are 2 interfaces available on computer 1 ( Ethernet and WiFi )
ping from computer 2 the IP address of the Ethernet connection of computer 1
disconnect the WiFi of computer 1
ping hangs for seconds, and then the packets are traveling again between the 2 computers.

The hanging happens as well if I turn back on the WiFi connection on computer 1. It happens as well if I ping the WiFi IP, and turn off/on the Ethernet connection ( or unplug/plug the cable).

I am using Linux Ubuntu 12.04 on both computers.

Any ideas why is this happening, and if / how can it be avoided?

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