.arpa, rDNS and a few magical ICMP hacks

Submitted ⁨⁨4⁩ ⁨weeks⁩ ago⁩ by ⁨nadia@links.nadia.moe⁩ to ⁨tech@links.nadia.moe⁩

https://sdomi.pl/weblog/24-arpa-hacks/