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Why does named lock up when it attempts to connect over IPSEC tunnels?
Author: ISC Support Reference Number: AA-00316 Views: 5294 Created: 2011-05-16 17:36 Last Updated: 2017-02-15 17:43 0 Rating/ Voters

This is due to a kernel bug where the fact that a socket is marked non-blocking is ignored. It is reported that setting xfrm_larval_drop to 1 helps but this may have negative side effects.

For more information, see:

https://bugzilla.redhat.com/show_bug.cgi?id=427629

and

http://lkml.org/lkml/2007/12/4/260

xfrm_larval_drop can be set to 1 by the following procedure:

echo "1" > proc/sys/net/core/xfrm_larval_drop


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