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[lots of people discussing MTUs and TCP efficiency] Ah, it was my understanding that all modern TCP implementations used path MTU discovery. By initially setting the don't fragment bit and watching for ICMP error packets they can quickly find the largets possible MTU which can be used without IP fragmentation between two computers. Is there some reason that fragmentation even matters here? The real problem seems to be that PPPoe uses a small MTU resulting in poor data/header ratios. I suppose there might be some NAT gateways which don't handle this properly... Bill Bogstad bogstad at pobox.com
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