10-wg-vpn-ipv6

#!/usr/bin/fish

# NetworkManager-dispatcher script to disable IPv6 for WireGuard VPN connections
#
# The `vpn-{up,down}` events are not sent for WG connections, so we have to use
# pattern matching on the interface on generic `up/down` events, by default this
# script matches any interface which starts with `wg`.
#
# Just install this script in `/etc/NetworkManager/dispatcher.d` to use it.
# (Don't forget to install fish shell since this is a fish script, not bash)

set DISABLE_PARAM /proc/sys/net/ipv6/conf/all/disable_ipv6

function main -a IFACE EVENT
	if not string match -q 'wg*' $IFACE
		return
	end
	switch $EVENT
		case up
			echo 1 > $DISABLE_PARAM
		case down
			echo 0 > $DISABLE_PARAM
	end
end

main $argv