Linux-kernel mailing list archive 2000-29,: Re: setting MTU on ethernet interfaces.

# Re: setting MTU on ethernet interfaces.

Cesar Eduardo Barros (cesarb@nitnet.com.br)
Mon, 17 Jul 2000 15:32:27 -0300

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- Maybe in reply to: Laurence Sanford: "setting MTU on ethernet interfaces."

If nothing but web browsing is working, try:

echo 1 > /proc/sys/net/ipv4/ip_no_pmtu_disc

If it works after that, someone is (incorrectly) blocking PMTU. Read more about
it at http://www.robertgraham.com/pubs/firewall-seen.html

You should really try to find who is blocking PMTU and convince him to stop,
since disabling PMTU makes things slower. Lowering your MTU isn't enough, since
the sending side (the web browser) will still try to use PMTU, trying 1500
first.

    --
    Cesar Eduardo Barros
    cesarb@nitnet.com.br
    cesarb@dcc.ufrj.br

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- Next message: Andre Hedrick: "RE: linux-kernel-documentation, proposal"
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- Maybe in reply to: Laurence Sanford: "setting MTU on ethernet interfaces."