Hi Gino,
It can be done. It isn't well-documented, however. On Mikrotik, for example, you put a management IP address on each router's ethernet interface, used for speaking vrrp only, and then put the IP address(es) that deal with customers on the vrrp subinterface. For example: rtr-1 ether1 assigned 172.16.1.1/30 (management IP used to negotiate vrrp only) vrrp1 = master 24.5.20.17/30 <-> 24.5.20.18/30 = cust-rtr-1 24.5.21.1/30 <-> 24.5.21.1/30 = cust-rtr-2 etc rtr-2 ether1 assigned 172.16.1.2/30 (management IP used to negotiate vrrp only) vrrp1 = backup, configure same IP addresses as found on rtr-1's vrrp1 interface In this configuration, the two rtr's use 172.16.1.0/30 to negotiate vrrp master/backup only. While rtr-1 is up, only the vrrp1 interface on rtr-1 is active and the /30s that are assigned between you and your customers are active only on rtr-1's vrrp1 interface. The vrrp1 interface on rtr-2 is not active, and the IP addresses configured there aren't doing anything. If rtr-1 fails, then the vrrp1 interface configured on rtr-2 becomes active and rtr-2 begins responding to the IP addresses that were previously being responded to on rtr-1's vrrp interface. You do need to configure the same IPs on both router's vrrp1 interfaces. I use this as my preferred setup on Mikrotiks, as the documented way of having traffic go out the ether1 interface and in the vrrp1 interface can make firewall configs and troubleshooting unnecessarily complicated. In this way, all traffic goes through the vrrp1 interfaces and the ether1 interfaces are used exclusively for management/vrrp traffic. Hope this helps, Dave From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Gino Villarini Sent: Thursday, July 28, 2011 3:36 PM To: motor...@afmug.com; WISPA General List (wireless@wispa.org) Subject: [WISPA] Router Redundancy and /30 Ip address Anyone have a way of having Router Redundancy with /30 ip address. all methods that I have researched (VRRP,HSRP) call for various IP addresses and are suitable for /26 or larger IP blocks. How could I have a Router Backup with multiple /30 ip addresses facing our customers? Gino A. Villarini g...@aeronetpr.com Aeronet Wireless Broadband Corp. 787.273.4143
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