Interface forwarding range may be to wide

In vmrouter script you'll find this piece of code:
```
if [ -n "$IF_IP_FORWARDING" ]; then
	[ "$ADDRFAM" = "inet" ] && echo 1 > /proc/sys/net/ipv4/conf/all/forwarding
	[ "$ADDRFAM" = "inet6" ] && echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
fi
```
Do we need to enable forwarding in all the interfaces?