topic Re: HA Cluster Internet Failover - Starlink in Spark Firewall (SMB)

HA Cluster Internet Failover - Starlink

SnafuNL — Mon, 17 Aug 2026 17:58:24 GMT

Hello All

I've got two 1590 appliances running HA through Spark Management at a remote site which has a mix of satellite connections - VSAT, OneWeb, and Starlink. I'm running into a problem with the Starlink.

The Starlink terminal only has a single ethernet, it's connected to a DEMARC switch so both firewalls can access it. Starlink appears to only provide a single CG-NAT IP per terminal and both firewalls seemingly try to lay claim to it - leading to a conflict and traffic loss.

As a stopgap I've disabled the Starlink port for the second firewall, but that defeats the purpose of HA. Is there a way to put the second firewall into a passive mode?

Re: HA Cluster Internet Failover - Starlink

PhoneBoy — Wed, 19 Aug 2026 00:05:09 GMT

Clustering requires connectivity on all interfaces, including WAN.
Which means if your Starlink terminal only hands out one IP, you're likely out of luck.

Re: HA Cluster Internet Failover - Starlink

Tom_Hinoue — Wed, 19 Aug 2026 02:27:08 GMT

Can the private IP space (before CG-NAT) be assigned statically?
If so, Scope Local may help if you have only 1 assignable private IP (under the Starlink terminal)