North American Network Operators Group|
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Re: Cool IPv6 Stuff
It's a lot easier to write a firewall module that monitors a SIP connection to allow for bi-directional traffic than it is to monitor for such connections and rewrite the packets.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?
Not to mention- what happens when the SIP traffic (for example) goes out with 1918 addresses in the packets? The firewall never sees the return traffic because the destination system is trying to send traffic to a private address- it gets lost in the ether and troubleshooting becomes a pain. With real addresses in the packets the traffic will at least make it back to the firewall- even if the firewall doesn't know how to handle them. At that point you know what's happening and can either correct the rules, enable a proxy, or yell at your firewall vendor.