Network Crash - Ping Tests Won't Respond To Anything?

Feb 6, 2013

About a week ago, our network started to experience complete failure.

Our Equipment:

Router: Netgear FVS336.xxx
Switch: Dlink DES-1024D (we have 6 of these switches in our building)
Wifi Routers: Dlink DIR-601, Linksys wrt54g, wrt54gv2
Computersservers: 40x
Copiersfax: 5x
Wireless clients: (iphones, laptops) at least 30

All has been working together in harmony for many years.Fast forward to last week when my hell began with intermittent crashes.Not sure what's causing the problem.When it happens, everybody loses their internet, the ability to communicate over the network; ping tests won't respond to anything (including the router) that exists on the lan, even with a static IP against other statics.In visually inspection of the switches and router, they seem to be happily blinking away with no apparent issue (visually).The only way I've been able to fix the problem is by power cycling the router.About 1 second after doing that, we're back in action for 2-6 hours (very unpredictable).I never had to power cycle any other devices)

Steps I've taken in troubleshootingeliminating potential culprits:

Replaced the router with a spare (new) FVS318G

Replaced the power supply for the router (suspected because problem remained after router swap)

Replaced cable going from router to lan switch

Removed linksys wifi router from network (the router had needed power cycling weekly and was old. So I unplugged it)

Removed Dlink wifi router from network (I hate dlink routers, so removed it).I'm at a loss.

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