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arp arp.src.proto_ipv4 wildcard search?

asked 2018-10-26 06:30:41 +0000

NJL gravatar image


Use case: identify what gateway servers on a number of different VLANs use, by identifying what GW the servers ARP for. This is needed since the GW must change IP address prior to a larger network migration.

I know I can see the details I'm after by using the field "arp.src.proto_ipv4", but my problem is that I can't search on this using wildcards.

As far as I can tell ( the field is simply an IPv4 address field, so I'm unable to use the "matches" keyword which would've given me the opportunity to use regex.

I need to know which servers ARP for a GW IP that ends with ".12", so essentially a display filter such as "arp.src.proto_ipv4 == ..*.12" is what I'm looking for.

Any and all help much appreciated!



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answered 2018-10-26 07:42:25 +0000

updated 2018-10-26 07:45:59 +0000

Hi Niels, did you try to make a filter like @cmaynard recommended (slice operator)?

For example this filter: arp.src.proto_ipv4[3] == c

Also I suspect when you use arp.src.proto_ipv4 ==x you're actually looking for the servers that have IP ending with 12 themselves.

Probably you have to use arp.dst.proto_ipv4[3] ==c for matching target IP address? And make a column for "sender IP address" (arp.src.proto_ipv4)

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Hi Packet_vlad, no I haven't found that thread, very helpful.

And you're completely right - it's not arp.src.protoipv4 I need, it's arp.src.protoipv4.

Thank you very much, it works!

NJL gravatar imageNJL ( 2018-10-26 08:00:47 +0000 )edit

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Asked: 2018-10-26 06:30:41 +0000

Seen: 990 times

Last updated: Oct 26 '18