Having a hard time wrapping my head around this problem. Working at a place with multiple sites, lots of computers, phones, POS systems, etc. we use a large application that runs the POS systems and records a whole bunch of stuff and sends it to a centralized server. Essentially use it for financial purposes and data and blah blah blah.
So last week one of the sites started trying to send packets from the POS to the server, but then the server tried sending packets to our core and then right to the firewall, where it was promptly dropped. Nobody could figure out why it was happening but changing the POS out seemed to have fixed it.
So today the same thing happened at a different site, we didn’t have the time or resources to change out the POS but changing the IP of the POS seems to have temporarily fixed it.
If it’s any help at all we use BGP as the routing protocol. I’m hoping this is enough information for someone to possibly point me in the right direction, eventually this is going to be a bigger problem, but I just have no idea why this would start randomly occurring at different sites, and there are so many POS systems it would be a massive project and a huge time and money sink to change out everything, without a guarantee it wouldn’t happen again.
Any suggestions would be great.
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