Iīve lived with this bug for the last year with all kernel versions and
ipppd releases.
When the MTUs are different (eth and ippp), 2 things can happen:
-the kernel hangs completely when someone dials in
-not everything is reachable from the masqueraded hosts:
* some web images donīt go through the gateway
* cannot pop mimed mail from an external host
And the last one Iīve discovered is when you choose 1500 as the MTU for
all the interfaces. After a few bytes socket tranmissions stop
completely. For instance listing an FTP directory and starting MC. The
ISDN connection remains, but I have to kill the hang apps.
My final workaround has been setting an MTU of 576. Till now everything
seems to work ok, but I still havenīt tested it enough to be 100% sure.
If you nedd further testing Iīll be pleased to help in anything I can.
Thank you
Pau Aliagas
Ready Soft