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[Openvpn-users] UDP fragmentation


  • Subject: [Openvpn-users] UDP fragmentation
  • From: manu@xxxxxxxxxx (Emmanuel Dreyfus)
  • Date: Mon, 1 Nov 2004 17:20:47 +0100

Hi

I'm considering working with OpenVPN, but I have a concern about a
problem I encountered with IPsec VPN: many DSL routers are broken enough
to block fragmented UDP packets.

With IPsec this problems pops up on ISAKMP phase 1 when using
certificates and a lot of vendor ID. This makes an UDP packet big enough
to be blocked. This is solved by handling fragmentation at the
application layer. Sending packets of no more than 552 bytes works.

Is that problem handled in OpenVPN?

-- 
Emmanuel Dreyfus
Il y a 10 sortes de personnes dans le monde: ceux qui comprennent 
le binaire et ceux qui ne le comprennent pas.
manu@xxxxxxxxxx

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