I may reveal some ignorance with this question, but I am really confused. We have 3 static IPs and one gateway/modem with my organization. The gateway/modem is located in a remote area of our building, so we only have one line from the gateway/modem to our "IT Office" where our routers, switches, servers, etc. are located.
I created two VLANS on our primary switch. All of the router WAN ports and the line from the gateway/modem are on one VLAN (public data); all internal LAN traffic is on the other (private data). The "public" VLAN has 3 different public IPs with one gateway IP coming from the gateway/modem.
Here is the problem: the routers will suddenly lose the connection with the modem, and our internet traffic will crash. And then it will come back up a minute later and work for 2-3 minutes before dying again. Sometimes one of the routers will continue to work fine. If I disconnect the gateway/modem line from the switch and connect it directly to one WAN port on one router, everything works fine (at least through that one public IP).
Is there something I am missing that would make this a likely scenario for disaster? Does this look like a possible hardware issue? I think either the switch is causing the problem or I am missing something obvious.