On 5-jun-2007, at 4:29, Adrian Chadd wrote:
Don't forget that the reason NAT works to the degree that it does today is because of all the workarounds in applications or protocol- specific workarounds in the NATs (ALGs). In IPv6, you don't have any of this stuff, so IPv6 NAT gets you nowhere fast with any protocol that does more than something HTTP-like. (Yes, I've tried it.)
Won't stateful firewalls have similar issues? Ie, if you craft a stateful firewall to allow an office to have real IPv6 addresses but not to allow arbitrary connections in/out (ie, the "stateful" bit), won't said stateful require protocol tracking modules with similar (but not -as-) complexity to the existing NAT modules?
I'm afraid so, yes. http://arstechnica.com/articles/paedia/ipv6-firewall-mixed-blessing.ars