John Mullan wrote:
Charles (and all).  I'd be quite interested in any information that would
optimize the "path MTU" within Bering between my Windoz boxes and my PPPoE
connection (DSL modem of course).

Could someone point in the right direction?
For windows registry settings, see one of the many speed-tweak sites on the 'net, for example:
http://www.speedguide.net/Cable_modems/cable_registry.shtml

It is also possible to control MTU size with the 2.4 kernel, where the kernel over-writes the portion of the TCP header that indicates the maximum allowable segment size, so the two ends negotiate a MSS smaller than your MTU without requiring registry tweaks. Some details about how this works are available in the advanced routing HOWTO:

http://www.linux.org/docs/ldp/howto/Adv-Routing-HOWTO/lartc.cookbook.mtu-discovery.html
http://www.linux.org/docs/ldp/howto/Adv-Routing-HOWTO/lartc.cookbook.mtu-mss.html

There's also a bit of general info on MTU problems in the FreeS/WAN docs (an IPSec VPN solution for linux), with a lot more detailed information in the mailing list archives, if you really want to get into the nitty-gritty:
http://www.freeswan.org/freeswan_trees/freeswan-1.99/doc/background.html#MTU.trouble
http://www.freeswan.org/mail.html

--
Charles Steinkuehler
[EMAIL PROTECTED]




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