It has relation with the system agreement that how we establish momentarily an IP multicast tunnel mechanism in WAN which does not support IP multicast mechanisms.
在一个不支持IP组播机制的广域骨干网中，如何随时建立一个IP组播隧道机制。它与体系协议有关。
2
For WAN access, a router (s) will be provided to route plant incoming and outgoing IP and other protocol traffic via the incoming communications system.
You can set up different packet filters for different users that are located on internal (LAN) side or external (WAN) side based on their IP addresses or their network Port number.