I use alpine standard 3.8.1, which has kernel 4.14.82-0-vanilla. When I start wireguard as client peer with *wg-quick up client*, It says: > [#] ip link add client type wireguard > [#] wg setconf client /dev/fd/63 > [#] ip address add 10.0.0.4/24 dev client > [#] ip link set mtu 1420 dev client > [#] ip link set client up > [#] resolvconf -a client -m 0 -x > [#] wg set client fwmark 51820 > [#] ip -4 route add 0.0.0.0/0 dev client table 51820 > [#] ip -4 rule add not fwmark 51820 table 51820 > [#] ip -4 rule add table main suppress_prefixlength 0 > sysctl: unrecognized option: r > BusyBox v1.29.3 (2018-11-21 11:45:56 UTC) multi-call binary. > > Usage: sysctl -p [-enq] [FILE...] / [-enqaw] [KEY[=VALUE]]... > > Show/set kernel parameters > > -p Set values from FILEs (default /etc/sysctl.conf) > -e Don't warn about unknown keys > -n Don't show key names > -q Quiet > -a Show all values > -w Set values > The client peer cannot ping server peer.