Traffic passing between remote terminals and corporate intranets through an access server provider network can encounter security and addressing problems. Intercepting and manipulating this traffic can overcome these, as well as other problems. For such traffic that is being transported over a plurality of Network Based Tunnels (NBT), this manipulation can be performed by manipulation equipment that may reside in the access server provider's network between an Access Gateway (AGW) and a Border Gateway (BGW). The manipulation equipment may manipulate received NBT packets by parsing the original packet that is encapsulated in the NBT packet, manipulating the original packet and reconstructing the NBT packet with the manipulated data of the original packet.