RELENG_5 and FAST_IPSEC limits

Mike Tancsa mike at
Tue Mar 15 09:40:37 PST 2005


We are running into a case where there are too many SAs, and doing a setkey 
-D would fail with a

"recv: Resource temporarily unavailable"

after displaying most of the associations.

Is there a way to get around this, or is there a hard limit ?

# setkey -D | grep ^172 | wc
      186     372    5096

When the remotes are renegotiating, and there are a lot of tunnels in the 
state of mature and dying, this number can go up to 341, but not 
higher.  This also seems to send racoon into a hung state that we then need 
to kill off and restart.

It was suggested in a post that /usr/src/sys/net/raw_cb.h get changed from

#define RAWSNDQ 8192
#define RAWRCVQ 8192

to something larger like

#define RAWSNDQ 24576
#define RAWRCVQ 24576

If this is the underlying issue, will it work on its own, or are there 
other values that need to be tuned ?  Will I need to recompile any userland 
apps (e.g. racoon, setkey) and are there any other values I would need to 


Mike Tancsa,                                      tel +1 519 651 3400
Sentex Communications,                            mike at
Providing Internet since 1994          
Cambridge, Ontario Canada               

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