I'm having a VERY strange problem with the network here. The users here are having intermitent connectivity problems. At random, they can't get out to the internet. Everything internally works fine. DNS resolves just fine, but when they try to ping out, they get a "Destination NET unreachable" response. 5 minutes later, everything is back up and working just fine.
**This is random and doesn't affect ALL users at the same time. Most users are fine while some are having problems.**
**ALL INTERNAL TRAFFIC IS FLAWLESS**
Current network configuration:
Users ----- Switch ------ Switch ------ Firebox X55e ----- Internet
Users ----- Switch ------ Switch
# of users: 30
Firewall: Watchguard Firebox X55e firmware 11.1
All switches are gigabit unmanaged
Ip subnet: 192.168.99.0/24
The firewall is currently configured with Wan Failover.
Things I have tried:
*Saved config of firewall and swapped it out with the same model (actually helped out a bit, but still having some issues)
*tried moving the firewall to a different switch
*Installed a hub between switch and firewall for packet capture (noticed that there is no traffic from the pc having problems when the problem is occuring even though they are trying to get on or pinging)
*monitored traffic through the firewall traffic monitor and noticed no packets coming in from pc with problems
*i've connected another switch to the network, connected the firebox to that, and connected specific users to it
I've tried to find a common denominator to try to solve the problem but haven't been able to pin point anything.
Any help is greatly appreciated.
Thanks in advance