Are you saying that hosts are required to support MTUs of at least 576 bytes? People have said that some dialup connections use 256 byte MTUs...
On Wed, Jan 19, 2005 at 06:04:25PM +0000, Ben Golding wrote: > Toad> "Please find me an internet standard that mentions an MTU of 576 > bytes" > > RFC879> HOSTS MUST NOT SEND DATAGRAMS LARGER THAN 576 OCTETS UNLESS > THEY > RFC879> HAVE SPECIFIC KNOWLEDGE THAT THE DESTINATION HOST IS > PREPARED TO > RFC879> ACCEPT LARGER DATAGRAMS. > RFC879> > RFC879> This is a long established rule. > http://www.ietf.org/rfc/rfc0879.txt?number=879 > > I agree, the best MTU is the largest possible without fragmentation, > which depends on your ISP and all other routers between yourself and the > other host. For example, between my PC at work and www.mit.edu it is > 1500. > > My answer to your original email was saying that a lot of dialup ISPs > have a max MTU of 576 and maybe some DSL connections as well. > > Anyway, here is some interesting info about finding your personal max > MTU: > http://www.internetweekly.org/llarrow/mtumss.html > http://members.tripod.com/~EasyMTU/easymtu/findmtu.html > > and some related tweaking info about Receive Window size for the curious > among you. > http://www.dslreports.com/tweaks/RWIN > > Ben -- Matthew J Toseland - [EMAIL PROTECTED] Freenet Project Official Codemonkey - http://freenetproject.org/ ICTHUS - Nothing is impossible. Our Boss says so.
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