Have you tried dropping the mtu? what size is it now??
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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.
- 1400. Maximum size for AOL DSL.
- 576. Typical value to connect to dial-up ISPs.
These are setting for netgear routers but the figures should be similar