From: Thomas Heiling <tom@goofy>
Message-Id: <199703142019.VAA00934@goofy.chess.langenfeld.de>
Subject: MASQ: TCP/UDP checksum errors SOLVED!
To: isdn4linux@hub-wue.franken.de
Date: Fri, 14 Mar 1997 21:19:35 +0100 (MET)
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Hello!
after some tweaking and testing I have solved the problem with
the checksum errors. ( Apparently and hopefully, up to now no
more error messages)
Because of the slowness of my computer (thanks Fritz!) I have done
two things:
a) changed the IRQ from 15 to 5 for the Teles card -> the Teles is now
on the Master controller
b) got irqtune and changed the priority for the teles card to maximum
in favour of disk. ( irqtune 5 )
With this two changes I was able to cure my errors from HiSax:
MASQ: failed TCP/UDP checksum from xx.xx.xx.xx!
for the Teles-driver the following error messages:
Teles: 	HSCX RDO mode=2
	HSCX B EXIR 40
Possibly the first solution would be sufficient, but what the heck,
don't touch a running system.

The original message is included below and yes I know my reply address
is wrong and should be heiling@online-club.de. I will fix
this really soon now, if my new Debian CD has arrived.
Thanks 
Dr. Thomas Heiling 
> 
> Newsgroups: comp.os.linux.networking
> Subject: MASQ:failed TCP/UDP checksum ?
> Reply-To: heiling@mail.online-club.de
> Followup-To:
> Keywords:
> Summary:
> 
> Hello!
> I am running Linux 2.0.29 with the isdnlinux-patches and
> with the hisax driver. I have configured this system as a router,
> that means with IP_FIREWALL and IP_MASQUERADING enabled.
> The connectivity from the Linux computer is o.k. and the first time
> the private net "behind " the firewall had access to the internet.
> If I start the Windows Microsoft Explorer from another machine and
> do some surfing everything went fine.
> But after some time I get something like this:
> Mar  8 20:42:24 goofy kernel: MASQ: failed TCP/UDP checksum from
> 194.77.170.27!
> and the Windows computer hungs up.
> The first thought was, that the "Optimize as router not as host" config
> is not 100% error proven, so I compiled a new kernel without this option
> and tried again. But the same error message comes up again.
> Thanks for any pointers and help
> 
> My System:
> 386/40 Mhz + CoPro, 20 MB RAM, 2 * 520 MB harddisk
> Teles 16.3 Isdn card ( with HiSax 2.0 + Patch 1-3),
> Adaptec 1542 + CD-Rom
> The system was first a Debian 1.1 System, but now I had done some
> tweaking and compiled/installed new versions.
> The System is connected via ISDN/PPP and the Firewall is up.
> 
> 
> Dr. Thomas Heiling
> email: heiling@online-club.de
> 
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