Clarify mssfix documentation

Acked-by: Jan Just Keijser <janjust@nikhef.nl>
Message-Id: <1452354825-5096-1-git-send-email-iam@valdikss.org.ru>
URL: http://article.gmane.org/gmane.network.openvpn.devel/10969

Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 651591525ee933c69f442d51d2b6064f2893181d)

diff --git a/doc/openvpn.8 b/doc/openvpn.8
index f68b1633892c6874c95cd837fa982cbdac05ad30..db5dd48bee513847e5653424726024f88acc9d21 100644 (file)
--- a/doc/openvpn.8
+++ b/doc/openvpn.8
@@ -1360,7 +1360,11 @@ parameter is interpreted in the same way as the
 .B \-\-link\-mtu
 parameter, i.e. the UDP packet size after encapsulation
 overhead has been added in, but not including
-the UDP header itself.
+the UDP header itself. Resulting packet would be at most 28
+bytes larger for IPv4 and 48 bytes for IPv6 (20/40 bytes for IP
+header and 8 bytes for UDP header). Default value of 1450 allows
+IPv4 packets to be transmitted over a link with MTU 1473 or higher
+without IP level fragmentation.
 
 The
 .B \-\-mssfix