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Hello guys :)

I'm looking for a help. I have a problem with capture filter configuration.

I want to capture just a traffic from specific tcp ports. (TCP port 23 (telnet) and tcp portrange 2066-2100)

So my syntax in "Capture options" "Capture filter" field looks like this:

tcp dst port 23 and tcp dst portrange 2066-2100

and there is no capture with this command!

If I use just "tcp dst port 23" or just "tcp dst portrange 2066-2100" as a filter, I can see the output, but I can't get these filters to work together as one. Where is a problem?

Thank you for your time and for your answers. Any helpful information is highly appreciated.

asked 26 Jun '12, 06:59

jomajo's gravatar image

accept rate: 100%

I don't know why, but this is working:

tcp dst portrange 2066-2100 or tcp dst port 23


Oh thanks, I saw I have an answer too :)

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answered 26 Jun '12, 07:08

jomajo's gravatar image

accept rate: 100%

I don't know why, but this is working

see the answer of Bill Meier. OR is the key. Reason: The destination port cannot be 23 AND in the range of 2066-2100 (at the same time).

(26 Jun '12, 07:39) Kurt Knochner ♦

Use ... or ...

and means both conditions must be satisfied which is not going to happen if the conditions are exclusive ....

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answered 26 Jun '12, 07:07

Bill%20Meier's gravatar image

Bill Meier ♦♦
accept rate: 17%

edited 26 Jun '12, 07:09

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question asked: 26 Jun '12, 06:59

question was seen: 33,932 times

last updated: 26 Jun '12, 07:39

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