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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Path-MTU-discovery
On Sun, 16 Jul 2000, Greg A. Woods wrote: > Experience is beginning to suggest that it's the vast majority of them > that use PMTUd now. Where it doesn't work _at_all_ on the "client" side > you quickly find out that perhaps as many as 2/3's (anecdotally > measured) of the "popular" web servers out there seem to be unusable I am behind a tunnel with something like 1446 MTU. It works just nicely, I have not found any sites so far that won't work. On the other hand, at work we're doing some tunneling using ciscos. Due to routing etc the ICMP "need-to-frag"-messages get lost and the people behind those tunnels cannot use 90% of the www sites (so they have to resort to proxies). Seems to me that PMTUd works better than most people think. I do believe that NT and Win2k comes default with a registry setting that makes it send all TCP traffic with the DF flag set (which I can see no reason for unless M$ IP stack cannot do refragmentation properly). This setting is changable as far as I know but I cannot seem to find the information at this time. Anyone? -- Mikael Abrahamsson email: [email protected]
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