Date: Fri, 31 Oct 2003 00:56:11 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Michal Mertl <mime@traveller.cz> Cc: current@freebsd.org Subject: Re: jumbograms (& em) & nfs a no go Message-ID: <3FA223AB.797B2528@mindspring.com> References: <20031029183808.M99053@prg.traveller.cz>
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Michal Mertl wrote: > I then left one computer at 4.9 and upgraded the other to 5.0. When I > mount a partition from 5.0 machine I found out, that copying reliably > works only from 5.0 to 4.9. The other way around I see messages 'em0: > discard oversize frame (ether type 800 flags 3 len 67582 > max 6014)' on > 5.0 and the copying stalls. On 4.9 machine I later see 'nfs server > 10.0.0.2:/usr: not responding'. The interface is stuck for some time - can > be revived by changing mtu back to 1500 and down/up sequence. Implies the sending host is not honoring the MTU restriction when deciding whether or not to frag packets. -- Terry
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