High Availability with ONE WAN IP

dmcentire

I don't think it's possible – but is there a way to have high availability with just 1 WAN IP and gateway (/30 network)?

I'd like to use CARP and the pfSense sync capabilities, but I don't have more than one WAN IP address to use. Here's what I have (sample IPs):

WAN Gateway: 255.50.75.153/30
WAN IP Address: 255.50.75.154/30

I also have a second block of IPs but I don't think it will help:

WAN #2 - 255.60.75.1/25 -- Also public addresses available through the above gateway

I thought about having a script enable the WAN interface (with the same IPs as the primary) on the backup if the primary goes down but I'm not sure if that's the best (or only) way to do this.

Thanks,

Dennis

cmb

No, have to have 3 static public IPs for CARP.

jasonlitka

@dmcentire:

I don't think it's possible – but is there a way to have high availability with just 1 WAN IP and gateway (/30 network)?

I'd like to use CARP and the pfSense sync capabilities, but I don't have more than one WAN IP address to use. Here's what I have (sample IPs):

WAN Gateway: 255.50.75.153/30
WAN IP Address: 255.50.75.154/30

I also have a second block of IPs but I don't think it will help:

WAN #2 - 255.60.75.1/25 -- Also public addresses available through the above gateway

I thought about having a script enable the WAN interface (with the same IPs as the primary) on the backup if the primary goes down but I'm not sure if that's the best (or only) way to do this.

Thanks,

Dennis

Who is your ISP? Comcast Metro-E does that but they've been willing in all the cases I know of to skip the /30 and just hand off your block at the switch. If you're with someone else, it never hurts to ask.