What is Martian Source in my logs?

Martian errors are usually generated when anyone is trying to connect to you from the internet with private_range_of_ip_addresses.


[17179910.136000] martian source 192.168.1.2 from 192.168.1.1, on dev wlan0
[17179910.136000] ll header: ff:ff:ff:ff:ff:ff:00:12:5a:b5:53:e9:08:06


Packets such as these which are impossible to route are labelled as Martian. I’d classify these as “mostly harmless” — if you have security problems
that are remotely exploitable, chances are good the attacker already
knows about them. If you don’t have any remotely exploitable security
problems, these are really nothing to be afraid of.