[Openswan Users] Tunnel up, some hosts work, others don't.

Simon Deziel simon at xelerance.com
Thu Feb 26 12:31:20 EST 2015

On 02/26/2015 12:22 PM, Richard Whittaker wrote:
> I can also reproduce this with MySQL. I can establish an initial
> connection and login to db2 from either 0.2 or 0.9, but as soon as I try
> "connect mysql" from the client command line, everything just freezes in
> the client.

This looks like PMTU issue. I'd give "iptables --clamp-mss-to-pmtu" a try.

> This got me to thinking the issue might be fragmentation,
> but large pings work just fine.

I haven't seen/looked at your config but if your have some compression
going on, this could explain why large ICMP go through but not large TCP

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