Re: jumbograms (& em) & nfs a no go

From: Terry Lambert (tlambert2_at_mindspring.com)
Date: 10/31/03

  • Next message: Stefan Farfeleder: "Re: Anyone object to the following change in libc?" 
    Date: Fri, 31 Oct 2003 00:56:11 -0800
To: Michal Mertl <mime@traveller.cz>

    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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