PMTU discovery, was Re: rdp and Wi-Fi

[Guus Sliepen]

On Fri, Dec 19, 2003 at 01:37:20PM -0700, Jason wrote:

> If it helps, I rdp through tinc all the time so it is most likely not a compatibility
> issue between the two.  Does it start to connect but then kinda hangs
> displaying the login scrn?  It might be an mtu issue... where large packets
> are getting dropped. A friend is having a similar weird issue with rdp
> through another (non-tinc) vpn and I suspect an mtu issue for him too..  Try
> setting the mtu of the network interface on the windows client (either the
> ethernet/wifi port if tinc runs on another box or the tinc tap interface if
> tinc is running on your client) to something lower than 1500.. try 1300 or
> 1400.

You could try the current CVS version, which contains code to do Path
MTU Discovery. Basically, it tries to figure out the effective MTU by
sending a few test packets, and after a while enforces the discovered
MTU on the VPN by sending ICMP messages which tell the hosts on the VPN
when to fragment their packets. To enable this, add "PMTUDiscovery =
yes" to the host config files.

-- 
Met vriendelijke groet / with kind regards,
    Guus Sliepen <guus at sliepen.eu.org>
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