LAN IP Alias allows Vigor Router to own multiple LAN IP addresses in a single subnet. Each IP address can be a gateway mapping to a specific WAN interface. So LAN clients can go through a different WAN interface simply by changing their gateway IP on the PC.
This article demonstrates how to set up BGP routing between two Vigor Routers which are connecting on the WAN. Suppose the two routers both have several routing subnets, and we would like them to exchange the routing information with each other. In this example, we use a different Autonomous System (AS) number for each router to make them External BGP (eBGP) peers.Note: The BGP peers with the same AS number are referred to as Internal BGP (iBGP) peers, and to as External BGP (eBGP) peers if they have different AS number. The main difference between iBGP and eBGP is that routes learned from an eBGP peer will be re-advertised to both iBGP peers and eBGP peers. However, routes learned from an iBGP peer will only be re-advertised to eBGP peers.
This article demonstrates how to set up a route policy and specify the interface for the traffic which destined for a certain domain name, e.g., draytek.com, so that network administrator may ensure which gateway will the LAN clients use when they are accessing a website.
Route Policy Diagnosis helps us simulate which route will a packet take, especially when there are a lot of static routes and route policies on the router. The function is at Diagnostics >> Route Policy Diagnosis (or Load Balance/Route Policy >> Diagnose for older version.)
If your ISP provides a block of IP addresses, you can add them to the "WAN IP Alias" configuration. To use the alias IP, you can either enable "Join NAT IP Pool" for the router to randomly pick one for outgoing connections, or map specific LAN client to the IP by Route Policy. This article introduces how to set up address mapping by Route Policy.
Suppose the Vigor Router is used for LAN-to-LAN VPN connections, and there is a firewall router on the network act as the Internet Gateway. We want all the traffic to be sent to the firewall router first, especially those from the remote network. This article shows how to use Route Policy and forward the VPN traffic to another device on LAN.