[4522] in linux-net channel archive
Re: IP Masquerading
daemon@ATHENA.MIT.EDU (Nigel Metheringham)
Tue Sep 24 17:25:39 1996
To: Charles Brian Hill <hill@unr.net>
cc: linux-net@vger.rutgers.edu
From: Nigel Metheringham <Nigel.Metheringham@theplanet.net>
In-reply-to: Your message of "Tue, 24 Sep 1996 02:12:21 EDT."
<Pine.GSO.3.93.960924020641.14910A-100000@corona>
Date: Tue, 24 Sep 1996 16:36:45 +0100
} I have been using Masquerading for quite a while, and have recently begun
} to notice errors of the following type reported by syslog:
}
} kernel: MASQ: failed TCP/UDP checksum from xxx.yyy.zzz.qqq!
}
} I know these are referring to erroneous data transfers...i.e., the TCP
} packets are arriving with errors. My question is, is anyone else seeing
} these kinds of errors? They are occurring on the machine that is acting
} as the dialup host and performing all the ipfwadm trickery.
This *should* mean that the other end is broken, or there is a
problem piece of kit/cable between you and the remote end. These
messages were added so I could see if there were problems in the masq
code, but to date all occurances of them have been traced to duff
data rather than broken masq code.
The priority of these messages should be drmataically lowered - I'll
send a patch to Linus/Alan within the next couple of days.
} If any of you have seen these, is there something that can be done about
} them? Is there some kind of trick I need to do in order to correct the
} problem? I'm using SLIP to connect to my dialup provider. That's about
} all the relevant information I can think of, though.
Do they come from the same IP every time, or all over the place?
Do they come in bursts?
Do you see errors on the slip interface?
Is there any way I can blame this on your setup :-)
If they are relatively rare (I mean 1 per minute or less), then I'd
say ignore them, otherwise there are problems somewhere.
Nigel.
--
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