Based on the number of web sites that are (stupidly) blocking *ALL* ICMP traffic at their border, and thus breaking MTU Path Discovery, you pretty much have to use 1500 (or at least 1460) nowadays. Mike Andrews (MA12) * mandrews@dcr.net * http://www.bit0.com/ VP, sysadmin, & network guy, Digital Crescent Inc, Frankfort KY Internet services for Frankfort, Lawrenceburg, Owenton, & Shelbyville "With sufficient thrust, pigs fly just fine." -- RFC 1925 On Wed, 17 Nov 1999 farber@admin.f-tech.net wrote:

What would be the optimum MTU speed for dial up modems? Ethernet default is 1500, but what about PPP connections?

I remember back in Trumpet Winsock days that you would lower that to a 2x multiple of the MSS size (or something like that).

Does PPP automatically try and negotiate the largest MTU?

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