Asymmetric Routing

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#03 Apr 2014
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#Beer of the night:
#Boulder Beer’s Shake Chocolate Porter.
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#Music during this post:
# Joe Hisaishi’s Spirited Away
# Agent Alvin
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#Revisions: Only 11
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First off….nightmares of Cisco questions with multiple router icons………

Rage

This was a Thursday night Linux rant with K-Dog celebrating his B-Day with dark beers and games. I had a situation where no matter which default gateway I set, one of the subnets couldn’t ping/connect/whatevertheF….

Potential resolutions:
http://kindlund.wordpress.com/2007/11/19/configuring-multiple-default-routes-in-linux/
(Editing /etc/iproute2/rt_tables to add a top down rule for routes. )

Or maybe:
https://access.redhat.com/site/solutions/53031
(Accept asymmetrically routed packets)

Try it out K-Dog…

#Update:
#08 Apr 2014:
Setting net.ipv4.conf.default.rp_filter to 2 really worked…!  Of course its not supported in our environment.