Date: Fri, 31 Oct 2003 12:50:30 -0500 From: Barney Wolff <barney@databus.com> To: Terry Lambert <tlambert2@mindspring.com> Cc: current@freebsd.org Subject: Re: jumbograms (& em) & nfs a no go Message-ID: <20031031175030.GB78910@pit.databus.com> In-Reply-To: <3FA223AB.797B2528@mindspring.com> References: <20031029183808.M99053@prg.traveller.cz> <3FA223AB.797B2528@mindspring.com>
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On Fri, Oct 31, 2003 at 12:56:11AM -0800, Terry Lambert wrote: > 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. 67582 looks awfully bogus even as a pre-frag length. How could that come over the wire? -- Barney Wolff http://www.databus.com/bwresume.pdf I'm available by contract or FT, in the NYC metro area or via the 'Net.
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