On Mon, 15 Jun 1998, Charles M. Hannum wrote:

> The only solution that can be applied on your end is to raise the MRU
> on your end of the PPP link (and the MTU on the other end), so that
> large packets can get through intact.

Note that the problem can't be the MTU of the link between him and the
Linux machine being to small (unless he is talking to a _very_ broken
system), but must be the MTU between the Linux machine and the ISP or some
other MTU higher in the path. 

If he _lowers_ the MTU between him and the Linux machine to match the MTU
of the link where the problem is, that should also solve the problem.