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¾  Default Route: If enable this function, the current PVC will be considered as the default 

gateway to internet from this device. 

¾  TCP MTU Option: Enter the TCP MTU as your desire. 
¾  Dynamic Route: Select this option to specify the RIP (Routing Information protocol) version 

for WAN interface, including RIP1, RIP2-B and RIP2-M. RIP2-B and RIP2-M are both sent in 

RIP2 format, the difference is that RIP2-M using Multicast, while RIP2-B using Broadcast 

format.  
• 

Direction: Select this option to specify the RIP direction. None is for disabling the RIP 

function.  Both means the ADSL Router will periodically send routing information and 

accept routing information, and then incorporate them into routing table. IN only means 

the ADSL router will only accept but will not send RIP packet. OUT only means the 

ADSL router will only send but will not accept RIP packet. 

¾  Multicast:  Select IGMP version, or disable the function. IGMP (Internet Group Multicast 

Protocol) is a session-layer protocol used to establish membership in a multicast group. The 

ADSL ATU-R supports both IGMP version 1 (IGMP v1) and IGMP v2. Select “Disabled” to 

disable it. 

Select this option if your ISP provides static IP information to you. You should set static IP 

address, IP subnet mask, and gateway address in the screen below (shown in Figure 4-8). 

 

Figure 4-8