Junk wrote:
I found my answer. (MTU size) This is good to know so I will let everyone else know.
I was aware of MTU, I just didn't realize VPNs were testy about them. (enough to make VNC choke)
I found the following information on Netgears website, but it pertains to all networks.
Setting MTU size is a process of trial-and-error: start with the maximum value of 1500, then reduce the size until the problem goes away. Using one of these values is likely to solve problems caused by MTU size:
1500. The largest Ethernet packet size; it is also the default value. This is the typical setting for non-PPPoE, non-VPN connections. The default value for NETGEAR routers, adapters and switches.
1492. The size PPPoE prefers.
1472. Maximum size to use for pinging. (Bigger packets are fragmented.)
1468. The size DHCP prefers.
1460. Usable by AOL if you don't have large email attachments, etc.
1430. The size VPN and PPTP prefer. <= My answer! woohoo :)
1400. Maximum size for AOL DSL.
576. Typical value to connect to dial-up ISPs.
Someone correct me if I'm barking up the wrong tree, but isn't IP supposed to handle all that sort of thing transparently in the background ? Ie, if the packets are too big for an intermediate link, the routers involved should fragment the packets and they should automatically get re-assembled at the other end. The only problem I thought an excess MTU was supposed to cause was a slight increase in router/IP stack workload as packets are fragmented and re-assembled.
Simon
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