max tcp sockets for bind 9.4.2-P1
Jason Bratton
jbratton at rackspace.com
Thu Jul 17 10:09:37 UTC 2008
Hello all,
Like many of you, I recently upgraded all of our caching nameservers.
Since we were already running BIND 9.4.2, I chose to upgrade to 9.4.2-P1.
After the upgrade, I started receiving complaints of DNS queries that were
truncated and retried over TCP failing.
It appears that BIND is limiting the number of open TCP connections to ~
100 per IP address it listens on. For example, on one of our caching
nameservers:
cachens-4:~# netstat -an | grep tcp | grep 72.3.128.240 | wc -l
99
cachens-4:~# netstat -an | grep tcp | grep 72.3.128.241 | wc -l
105
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