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G_W_Albrecht
MVP Silver
MVP Silver
‎2023-01-22 12:30 AM

As you have different routable IPs from the ISPs, i would do HA ISP redundancy using 2 VPNs:

- ISP 1 with IP 1 is the default ISP for all traffic

- IP 1 builds VPN tunnel 1 to remote site

- ISP 2 with IP 2 is the HA ISP

- IP 2 builds VPN tunnel 2 to remote site

- only VPN 1 goes up !

This is the working config, until connection monitoring finds that ISP 1 is down:

- if ISP 1 goes down, VPN tunnel 1 goes down

- ISP 2 goes active, and now VPN tunnel 2 comes up

Routing works as both VPN tunnels can not be up together...

CCSP - CCSE / CCTE / CTPS / CCME / CCSM Elite / SMB Specialist

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