IPv6 links are unfortunately not "reliable." Many IPv6 gateways, while not

implementing NAT, do implement stateful firewalling with absurdly short
timeouts (<60s). Keepalives are still required in IPv6.

Network engineers continue to mindlessly carry forward cruft and baggage
from IPv4 to IPv6.

node/Path.hpp

@@ -252,7 +252,7 @@ public:
 	 */
 	inline bool reliable() const throw()
 	{
-		if (_addr.ss_family == AF_INET)
+		if ((_addr.ss_family == AF_INET)||(_addr.ss_family == AF_INET6))
 			return ((_ipScope != InetAddress::IP_SCOPE_GLOBAL)&&(_ipScope != InetAddress::IP_SCOPE_PSEUDOPRIVATE));
 		return true;
 	}