Allied Telesis AT-WR4500 manual Standard Policy-Based Routing with Failover

114	AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers
	RouterOS v3 Configuration and User Guide

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ISP1 gives us 2Mbps and ISP2 - 4Mbps so we want a traffic ratio 1:2 (1/3 of the source/destination IP pairs from 192.168.0.0/24 goes through ISP1, and 2/3 through ISP2).

IP addresses of the router:

[admin@ECMP-Router] ip address> print
Flags: X - disabled, I - invalid, D - dynamic
#	ADDRESS	NETWORK	BROADCAST	INTERFACE
0	192.168.0.254/24	192.168.0.0	192.168.0.255	Local
1	10.1.0.2/28	10.1.0.0	10.1.0.15	Public1
2	10.1.1.2/28	10.1.1.0	10.1.1.15	Public2

[admin@ECMP-Router] ip address>

Add the default routes - one for ISP1 and 2 for ISP2 so we can get the ratio 1:3:

[admin@ECMP-Router] ip route> add gateway=10.1.0.1,10.1.1.1,10.1.1.1

[admin@ECMP-Router] ip route> print

Flags: X - disabled, A - active, D - dynamic,

C - connect, S - static, r - rip, b - bgp, o - ospf

#	DST-ADDRESS	G GATEWAY	DISTANCE INTERFACE
0	ADC 10.1.0.0/28		Public1
1	ADC 10.1.1.0/28		Public2
2	ADC 192.168.0.0/24		Local
3	A S 0.0.0.0/0	r 10.1.0.1	Public1
		r 10.1.1.1	Public2
		r 10.1.1.1	Public2

[admin@ECMP-Router] ip route>

Standard Policy-Based Routing with Failover

This example will show how to route packets, using an administrator defined policy. The policy for this setup is the following: route packets from the network 192.168.0.0/24, using gateway 10.0.0.1, and packets from network 192.168.1.0/24, using gateway 10.0.0.2. If GW_1 does not respond to pings, use GW_Backup for network 192.168.0.0/24, if GW_2 does not respond to pings, use GW_Backup also for network 192.168.1.0/24 instead of GW_2.

The setup:

[GW_Backup]

IP: 10.0.0.1

[GW_1]		[GW_2]
IP: 10.0.0.2		IP: 10.0.0.3
	Network
	10.0.0.0/24
		Interface: Public
		IP: 10.0.0.7/24
Interface: Local1		Interface: Local2
IP: 192.168.0.1/24		IP: 192.168.1.1/24
192.168.0.0/24	192.168.1.0/24

Figure 17: Standard Policy-Based Routing with Failover