Setup: 1 ethernet cable coming from the wall, 2 external IP's. Cable from wall goes to a switch, switch goes to a wlan router for our wifi (with its own external IP) and to a cisco firewall. Cisco firewall goes to a few different switches which power all our rooms.
Cisco firewall has it's own external IP-adress too, and works like DHCP server.
Lately we have had a lot of troubles on our network, external access just drops out of nowhere for a few minutes. This ONLY affects everything from the cisco firewall and "downward". The wifi isn't affected.
I had plugged in an extra switch last week, problems got worse. Disconnected it yesterday, and we had less problems but the internet still craps out a few times a day. Internal IP's are still pingable. Problem is resolved when i unplug the firewall for a few seconds and then plug it back in. No other changes than this made to the network for months. Problems started 4-isch weeks ago.
I can connect to the firewalls internal management, but cant find anything strange there. The connection to it craps out when the net craps out though.
Anyway, this is about as far as i have come. No idea how to go further. What would the next logical step of troubleshooting be?
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