Hi all,
Recently my company has acquired some a few Firepower 1120 security appliances and a firepower management VM for use at our various branch offices.
I am trying to configure a route-based site-to-site IPsec tunnel between a pair of them within the FMC and am having no luck.
The problem is that when attempting to save the VPN configuration, I am given the following error:
"Both peers have different tunnel source IP versions configured for
their interfaces.
One peer has been configured with an IPv4 tunnel source and the
other peer has been configured with an IPv6 tunnel source.
Select both interfaces so that the IP versions of the tunnel source
interfaces match on both peers."
I'm not sure what the cause of this error is, as it's clear that both tunnel source interfaces have been assigned an IPv4 address.
A couple of things to note:
Both firewalls are assigned a static address via DHCP
The remote firewall is managed remotely via the outside interface. Not sure if this is a possible issue since i've noticed that I cannot select the outside interface as a source for the VTI unless FMC management is temporarily disabled
IPv6 is disabled on the outside interface of both firewalls
Pretty new to these so apologies for any ignorance. Not sure if i've just missed something obvious or there is something else going on.
Regards
Dan
