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VPN IP packet size problem

Could anyone answer the following question or point me in the right direction?

In trying to configure all of our Macintosh clients to connect to our VPN were running into an IP packet sizing problem.

In testing I can establish a VPN connection fine from a Mac and ssh to another macintosh or linux box on the company's intranet. I can do various commands as long as the response of the command is only a few lines of text (eg. ls). When the response to the command is long (eg. ls -lag) I get a few lines of text and then the connection hangs. We've determined that this is related to the size of IP packets that it's trying to send.

It appears that the PIX firewall and router cant allow automatic IP packet size negotiation. We have no control over the router. As embarrassing as it is, the VPN adapter for a windoze 98 machine has an option for IP packet size. Choices are Automatic, Small, Medium and Large. Selecting small IP packet size for the VPN adapter under windows 98 gets a windows machine up and running.

The question is: Is there a way to specify the packet size that the VPN client can send or disable automatic negotiation?
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