Draytek Vigor IPPBX 2820 Series User Manual page 230

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use the Main Router to surf the Internet.
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create a private subnet 192.168.10.0 using an internal Router A (192.168.1.2)
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create a public subnet 211.100.88.0 via an internal Router B (192.168.1.3).
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have set Main Router 192.168.1.1 as the default gateway for the Router A 192.168.1.2.
Before setting Static Route, user A cannot talk to user B for Router A can only forward
recognized packets to its default gateway Main Router.
1. Go to LAN page and click General Setup, select 1st Subnet as the RIP Protocol
Control. Then click the OK button.
Note: There are two reasons that we have to apply RIP Protocol Control on 1st
Subnet. The first is that the LAN interface can exchange RIP packets with the
neighboring routers via the 1st subnet (192.168.1.0/24). The second is that those
hosts on the internal private subnets (ex. 192.168.10.0/24) can access the Internet
via the router, and continuously exchange of IP routing information with different
subnets.
2. Click the LAN - Static Route and click on the Index Number 1. Check the Enable
box. Please add a static route as shown below, which regulates all packets destined to
192.168.10.0 will be forwarded to 192.168.1.2. Click OK.
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VigorIPPBX 2820 Series User's Guide