Issue after changing IP address of master and backup firewall

[James Chase]

Hi,

I recently upgraded to 4.9 and everything seemed OK between my master 
and backup firewalls setup with CARP and state sharing. The firewalls 
were setup strange, the backup had the internal IP of .25 and the master 
had .26. I wanted to swap this so that the master firewall IP would be 
in numerical order, so I changed the hostname.x file and rebooted them 
both at the same time.

After that I had continuous issues with the backup firewall. It just 
kept restarting, so I switched the IP's back. The problem continued, and 
I found that it would only boot without crashing if I let it boot with 
the network cables unplugged and then plugged them in after it was up. 
However, trying to connect to that firewall with SSH causes the system 
to crash immediately (it often makes a click sound right when you do it 
and then hard reboots). It seemed like it functioned when I tested the 
carp failover though!

I brought the firewall home and it works fine away from that network. 
The crash dumps don't appear to be understandable by the everyday man. 
Is there some sort of disk caching or other area that could cause the IP 
change to have created a problem? I only changed the hostname file for 
the interfaces I wanted to swap (internal interface and the pfsync 
interface) so I'm not sure where the problem would be.