[nsd-users] NSD4 goes unresponsive with lots of TCP connection!

Kabindra Shrestha kabindra at geeks.net.np
Fri Apr 8 06:10:49 UTC 2016


> On Apr 6, 2016, at 5:41 PM, Daisuke HIGASHI <daisuke.higashi at gmail.com> wrote:
> Hi,
>  I have seen opposite (same?) situation with BIND9 nameserver -- many
> UDP queries and
> almost unresponsible both for UDP and TCP query.
> That was not due to BIND9's issue, but firewall (iptables) state table was full.
Yes, we have seen that problem as well. The state table keep tracks of UDP connections as well, so we bypass state table for port 53 both UDP and TCP on all our production servers.


Kabindra Shrestha

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