Oui, it is firewalled, but since the core changes are on UP election. When the masses upgrade, no more 3.7 ultrapeers would become UP if firewalled, so in long term they will disappear. I think it is wise to let those dumb UP to connect to newer UP, because otherwise they would cluster themselves will older UP and make a large portion of the LW nodes to get low performance (+ they would consume lot of bandwith harrrassing newer UP to get their 32 gnet connections).

À+