[ns] Firewall and NAT simulation

Hi, Could anyone please point me to the NS2 simulation package for the firewall and NAT traversals (e.g. STUN protocol), if there is any? Many thanks in advance! G.

[ns] large-scale p2p simulation

Hi, I need to simulate and study applications performance over large-scale (e.g. million nodes) p2p networks (e.g. chord ). Could any NS2 expert please provides some suggestions on whether NS2 is a good simulator for this purpose? I mainly concern about NS2 scalability. Thanks in advance!