I have this fw4 rule when tethering from my phone
chain mangle_postrouting_ttl65 {
type filter hook postrouting priority 300; policy accept;
counter ip ttl set 65
}
chain mangle_prerouting_ttl65 {
type filter hook prerouting priority 300; policy accept;
counter ip ttl set 65
}
in
/etc/nftables.d/12-mangle-ttl-65.nft