Re: Duplicate IP ??

From: Matti Aarnio (
Date: Tue Jun 26 2001 - 16:06:21 EST

On Tue, Jun 26, 2001 at 03:51:33PM -0400, Richard B. Johnson wrote:
> I just got a bunch of messages from, sent to
>, claiming a "local configuration error"
> and some kind of a loop.

        Weird... I don't recall any bounces..

        Logs show *one* bounce from just
        about an hour ago, and it went to linux-kernel-owner ..

        There are also 121 successfull deliveries in 12 hours
        collected in the log.

> There is no configuration that has changed on that machine for
> at least two years although our firewall got updated last week
> to fix the ECN bug.
> I checked with to see if the machine address was still
> resolvable, it is.
> I can `telnet 25`. That connectivity works.
> So I don't get any mail from What goes?

        Where then those 121 messages went ?

        The ECN connectivity problem is visible only when
        connection originator (= vger) has the ECN bit on.

        If incoming SYN doesn't have ECN bit on, reply to
        SYN is sent without ECN. That is why people can
        reach VGER, but VGER might not be able to reach
        people's MTAs.

> Dick Johnson

/Matti Aarnio
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This archive was generated by hypermail 2b29 : Sat Jun 30 2001 - 21:00:15 EST