Slice it Like Roast Beef: Parsing Raw ARP Messages in Gravwell

Feb 23, 2021 9:06:44 AM / by John Floren posted in Data Fusion, compound queries

One of Gravwell's great strengths is binary ingest: you can store things like raw packets, then parse them later when you know what you want to extract. This came in handy recently when I set up IPv6 on my home network and wanted to keep an eye on who's issuing Router Advertisement (RA) messages. A RA message by itself isn't very helpful, since you just get a MAC address and an IPv6 link-local address, but with a little bit of Gravwell query magic, I was able to parse out ARP packets to link the IPv6 address to an IPv4 address, which helps identify the machine.

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