From: Guus Sliepen <guus@tinc-vpn.org>
Date: Thu, 31 Jan 2013 14:58:33 +0000 (+0100)
Subject: Detect increases in PMTU.
X-Git-Tag: release-1.0.20~6
X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=commitdiff_plain;h=1d7b86cd9d1421f67d3717a52a52635155a29829;hp=1d7b86cd9d1421f67d3717a52a52635155a29829

Detect increases in PMTU.

Tinc never restarts PMTU discovery unless a node becomes unreachable. However,
it can be that the PMTU was very low during the initial discovery, but has
increased later. To detect this, tinc now tries to send an extra packet every
PingInterval, with a size slightly higher than the currently known PMTU. If
this packet is succesfully received back, we partially restart PMTU discovery
to find out the new maximum.
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