OPNsense Forum

English Forums => General Discussion => Topic started by: serveria.com on December 13, 2017, 10:02:14 am

Title: Multiple IPv4 subnets on one interface
Post by: serveria.com on December 13, 2017, 10:02:14 am

Hi,

I wonder if there's a way to hook up several IPv4 subnets to multiple interfaces simultaneously? Our topology is as follows: two incoming interfaces from our upstreams (dynamically routed via BGP) and two outgoing to two server racks. We tried virtual IPs but the GUI only allows us to add a single /24 subnet to each interface then it says "This IP address is being used by another interface or VIP". Any ideas on how this can be fixed?

Title: Re: Multiple IPv4 subnets on one interface
Post by: franco on December 13, 2017, 10:27:10 am

Hi there,

You probably want to bridge them which is possible by creating a bridge holding both interfaces, but that is not a recommended setup. Best to get a hardware switch to do this for you if you want a thoroughly reliable implementation.


Cheers,
Franco

Title: Re: Multiple IPv4 subnets on one interface
Post by: serveria.com on December 13, 2017, 10:49:46 am

Yes, we have hardware switches in both racks behind the OPNsense router.

Yes, we have a bridge set up. Does it mean we need to specify the subnets via virtual IP only on one interface which is a part of the bridge?

Title: Re: Multiple IPv4 subnets on one interface
Post by: mimugmail on December 13, 2017, 10:55:08 am

Does you switches support MLAG or are stacked? Then you could create a LAGG via LACP.

Title: Re: Multiple IPv4 subnets on one interface
Post by: serveria.com on December 13, 2017, 11:00:36 am

I will try to find out but I doubt they do. These switches were shipped to us by our customer so we're not in a position to swap anything unfortunately. I guess one of the switches is even unmanaged or has some kind of issue with remote access.