On 7/16/07 10:43 AM, "Joel Jaeggli" <joelja@xxxxxxxxx> wrote: > Widespread deployment of ALG's as mediators means you have to upgrade > the network to support new applications. or applications are built on > top of hostile tunnels over your alg infrastructure (sound familiar?). > While some enterprise networks seem to favor this, it's not really the > Internet. At some point a lot of these things tend to look awfully similar to one another (NATs look like tunnel endpoints look like relays, etc.) but they tend to break out into broad categories. So, you have some mechanisms that operate at the network layer and some that operate at the session or application layer. The lower in the stack they sit the more general they can be, clearly, but then you tend to encounter more problems around reachability and findability. Melinda _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf