Hi, On Mon, Aug 24, 2015 at 09:17:44PM +0200, Jiri Horky wrote: > thanks for the information. I see you effectively increased the size to > 1.2k which, as far as I know, will not work for people with dial ups.
If that wouldn't work, openvpn data transfers would not work either - but
surprisingly, they do :-) - data packets are 1500+ bytes in size, unless
specifically told (--link-mtu) to be smaller. We do cap the control channel
MTU to a smaller value to give particularily broken setups (like, 1400 MTU
*and* broken fragments) the chance to push smaller --link-mtu from the
server.
"Dial-Up", per se, does not imply a smaller-than-1500 MTU - some folks
do that, for "performance reasons" (reducing MTU actually reduces
performance, as it increases TCP overhead, but what do I know against
glossy computer magazine advice...), but even a 574 byte MTU will still
work *if* fragmentation works.
Which it normally does in this combination - fragmentation tends to break
if stupid NAT routers are involved, but "dialup with modem links and
574 mtu" is usually not connected to a NAT router but modem->PC...
But as I said - I'm waiting for feedback.
gert
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Gert Doering - Munich, Germany g...@greenie.muc.de
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