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jsavage
Joined: 16 Nov 2004 Posts: 2
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Posted: Tue Nov 16, 2004 3:29 am Post subject: Detecting TCP checksum errors |
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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: 12805 Location: USA
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Posted: Tue Nov 16, 2004 2:24 pm Post subject: |
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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
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Posted: Wed Nov 17, 2004 11:16 am Post subject: |
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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: 12805 Location: USA
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Posted: Wed Nov 17, 2004 2:47 pm Post subject: |
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"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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