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Rev

Thanks for the answer! I did indeed run ip addr .../4 .... Edited the question. Will try your solution out immediately.
– Tim Hilt
Commented Mar 26, 2020 at 11:18
In your case, specifying a too-large subnet (too-short prefix length) shouldn't actually make the Arduino unreachable – it includes more than needed, but doesn't exclude what's necessary. (It can cause other problems though, such as being unable to reach 160.0.0.0–175.255.255.255 which are unnecessarily included.)
– grawity_u1686
Commented Mar 26, 2020 at 11:19
I tried it out. The ping still returns Destination Host Unreachable and the arping doesn't receive anything either. And you're probably right about me confusing subnet- and DNS-mask. I wonder why it worked before though!
– Tim Hilt
Commented Mar 26, 2020 at 11:30
I know why it worked! I didn't ping 172.31.255.254, but 172.31.255.253, which means i pinged myself. No wonder that worked
– Tim Hilt
Commented Mar 27, 2020 at 12:27

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