pkg/iptables: enable simultaneous ipv4 and ipv6

This commit enables simultaneously managing IPv4 and IPv6 iptables
rules. This makes it possible to have peers with IPv6 allowed IPs in an
otherwise IPv4 stack and vice versa.

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

pkg/mesh/mesh.go

@@ -252,7 +252,7 @@ func New(backend Backend, enc encapsulation.Encapsulator, granularity Granularit
 	}
 	level.Debug(logger).Log("msg", fmt.Sprintf("using %s as the private IP address", privateIP.String()))
 	level.Debug(logger).Log("msg", fmt.Sprintf("using %s as the public IP address", publicIP.String()))
-	ipTables, err := iptables.New(len(subnet.IP))
+	ipTables, err := iptables.New()
 	if err != nil {
 		return nil, fmt.Errorf("failed to IP tables controller: %v", err)
 	}