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Detecting TCP checksum errors

 
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jsavage



Joined: 16 Nov 2004
Posts: 2

PostPosted: Tue Nov 16, 2004 3:29 am    Post subject: Detecting TCP checksum errors Reply with quote

Can IP Tools be used for detecting any occurances of TCP Checksums being incorrect with respect to the pseudo header + payload ?

If not, what tools are recomended for A. checking for such errors and B. generating test packets that can be used to demonstrate the tool ?

James Savage
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KS-Soft



Joined: 03 Apr 2002
Posts: 11761
Location: USA

PostPosted: Tue Nov 16, 2004 2:24 pm    Post subject: Reply with quote

IP-Tools can provide information about invalid incoming TCP packets ("Local Info" utility -> "Statistics" -> "TCP" -> "Incoming Errors" counter).

But you need to detect such packets in automatic mode, right?
In this case you may use Advanced Host Monitor http://www.ks-soft.net/hostmon.eng/index.htm
Use "SNMP Get" test method with OID=1.3.6.1.2.1.6.14.0

On the other hand, if you need to see detailed information about TCP packets, our tools cannot help you.
You need some sort of sniffer...
I think this list will be useful http://www.snapfiles.com/Shareware/network/swpacketsniffer.html

Regards
Alex
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jsavage



Joined: 16 Nov 2004
Posts: 2

PostPosted: Wed Nov 17, 2004 11:16 am    Post subject: Reply with quote

Thanks for that. I have taken a look at Advanced Host Monitor but am a little over awed by it at the moment. I can only see SNMP, SNMP Trap and SNMP test so how do I specify 'Get' ? Presumably I set the alert to monitor the Oid you mentioned but what should I compare it to ?

James
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KS-Soft



Joined: 03 Apr 2002
Posts: 11761
Location: USA

PostPosted: Wed Nov 17, 2004 2:47 pm    Post subject: Reply with quote

"SNMP" and "SNMP Get" is the same test method

Quote:
Presumably I set the alert to monitor the Oid you mentioned but what should I compare it to ?


Compare to previous value using "increase by" option of the test.

Regards
Alex
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