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Hey got same Problem with 3 IP's and Same Gateway, got ist solved.
You need seperate MAC for every IP and set it to the seperate Interface in Proxmox VM Conf for Opnsense.
Interfaces conf file add to Main vmbr0 with Main-IP
up ip route add WAN2-IP dev vmbr0
up ip route add WAN3-IP dev vmbr0
In Opnsense create Interfaces and set IP4 on DHCP then you are able to get same Gateway for Multiple Wan Interfaces. What a Heck :-)
Try and Error multiple Times and a lot of Beer :-)
Hope it helps you.
You need seperate MAC for every IP and set it to the seperate Interface in Proxmox VM Conf for Opnsense.
Interfaces conf file add to Main vmbr0 with Main-IP
up ip route add WAN2-IP dev vmbr0
up ip route add WAN3-IP dev vmbr0
In Opnsense create Interfaces and set IP4 on DHCP then you are able to get same Gateway for Multiple Wan Interfaces. What a Heck :-)
Try and Error multiple Times and a lot of Beer :-)
Hope it helps you.
