Hi All, We have dual ISP setup, and to load-balance the traffic we are using ECMP with static routes, and it works fine for the internet bound connections and traffic gets load-balanced. We however face issues with connection to our VPN servers in the DMZ. They are used by remote users to create a RA-VPN tunnel with the VPN servers from internet. The users have to try atleast 4-5 times before they get a successful connection with the VPN servers. We suspect it is because the VPN server have a public IP published on internet, which is a ISP2 public range. The return packet is getting load balanced too , towards ISP1 and cause assymmetric routing and ISP2 doesnt like it. Is there a way to ensure the return packet goes through ISP2 only? We ahve tried PBF but doesnt seem to work. We ahve also enabled symmetric return option in ECMP, and confused why it doesn't seem to work. We have a TAC case open, but no engineer has any idea or shown any willingness to go deeper. Below is the topology.
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