A.P. Lawrence

tcpdump

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From - Tue Aug 10 08:19:21 1999
Xref: world comp.unix.sco.misc:102627
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From: "Radek Tomis" <rts@mediumsoft.cz>
Subject: Re: Need Packet Sniffer
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Date: Mon, 9 Aug 1999 08:54:07 GMT Message-ID: <009401bee244$e3c45160$8e0314ac@rtsnt>
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> From: Fairlight <fairlite@iglou.com>
> Sent: Monday, August 09, 1999 9:48 AM

> There is a SCO OS5 server on a LAN of a client's, and need to diagnose a
> network problem.  Something appears to be saturating his LAN from time to
> time.  The client is not able to diagnose with Win* sniffers, and putting
> a Linux box on at this point is not feasible.
>
> Someone suggested TLS604 (for tcpdump), and while I'd be happy to use it,
> I can't seem to get OS5 to recognize the second ethernet card but not put
> a TCP stack on top of it either, so that tcpdump would work with the MDI
> interface.  The MDI interface apparently requires that tcpdump be highly
> crippled.
>
> Therefore, I need to find some freeware/shareware packet sniffer that will
> compile on, and is compatible with OpenServer 5.0.x and will work on a
> card that presently has a TCP stack running.
>
> That, or if someone can tell me how to meet the requirements of TLS604, it
> would be greatly appreciated.  Removing the ifconfig did NOT prevent the
> device from being used (in /etc/tcp / S85tcp).

I never used tcpdump with two NICs, but if you want, you can look at my MDI
reservation script at <http://members.xoom.com/rts101/tmp/mdirsv.sh> I used
to easily switch the NIC between TCP/IP stack and tcpdump.

The script may not work on your particular system (especially with two NICs
installed), but you can at least verify that you followed the correct steps
to reserve MDI for your NIC.

Before running the script (should you decide to), study it thoroughly and
make backups of all files that are being modified.

--
Radek Tomis
rts@mediumsoft.cz

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