One Public IP address for Two ISPs

Hi All,

We have two leased line terminated on a single firewall from ISP A (a.b.c.d) and ISP B (e.f.g.h) . We have static public IP address pool from both the ISPs. Both links are configured active and backup link primary(ISP A) fails then backup (ISP B) link goes up.

In this kind of failures Public IP address changes on Firewall to the respective ISP. In this kind of failures we have to point our VPN users to ISP B's (e.f.g.h) public address which is cumbersome.

Please suggest what we have to do to use the same public IP address for both the ISPs.

Whether we have to any kind of Configuration on Firewall. We are having Cyberoam CR25ia.

Thanks