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How can I filter-out a range of IP Addresses belonging to a given subnet (and not the whole subnet)

asked 2019-03-14 12:37:26 +0000

Let's say I have a subnet defined as 10.223.105.0/24 and that I want to discard any message originating from addresses 10.223.105.17 through 10.223.105.123.

How can I do that?

Documentation shows that operators <, <=, > and >= can be used with single-number values like frame.len but how can it be used with IP Addresses? Can they directly handle a IP Address in the 10.223.105.22 format? Do we have to use the numerical value of the IP Address and compare it to a 32-bit number? If so, how should every field of the IP Address be mapped into that 32-bit number?

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If you want to discard packets originating from that IP address range, then it sounds like you'd be more interested in a capture filter than a Wireshark display filter. Is that the case?

cmaynard gravatar imagecmaynard ( 2019-03-14 16:49:41 +0000 )edit

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answered 2019-03-14 15:16:52 +0000

grahamb gravatar image

Did you try it?

You can indeed use > et all on ip addresses directly, no need to convert to a number. I prefer to view my filter as to what should be filtered "in", so that's everything with a source address less than 10.223.105.17 or greater than .123 giving:

ip.src < 10.223.105.17 || ip.src > 10.223.105.123
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Asked: 2019-03-14 12:37:26 +0000

Seen: 40 times

Last updated: Mar 14