I'm stuck in between a very bad cocktail mix of two very desperate technologies. One is Nessus and other is a Juniper EX2200. When I'm running the two together, the NIC on my HP MiniTower 6200 Pro shuts down completely. This happens roughly 2-3 minutes into the Nessus scan.
My environment is that I have a Juniper switch set up along with SSG-5, which provides the gateway for the lab-test environment. Firewall is working in NAT mode.
Rough description of my problem environment is:
Juniper ---> uplink | SWITCH ---> vlan 20 > connected via trunk cable | PC - Gigbait Ethernet card (belongs to vlan20)
When the Ethernet card shuts down, the packet dump shows (if I remember correctly):
Juniper84:91:12 ........ 52 RST spanning tree
It is a link layer protocol message coming from the Juniper switch.
Also, if I run the scan using uplink direct connected into my NIC card I do not get a problem.
I'm thinking that there is some kind of update sent from switch to my access port which shuts down the NIC card, something like STP updates. Right now, I haven't disabled such updates because I really don't know what is causing it.
Also, please suggest any troubleshooting steps / commands I can run on switch device.
I just resolved the problem as I just found that VMWare networking service was sending in VTP updates through my machine access port, doing so resulted in core switch putting my port into blocking mode.
With this solved, is there a way I can prevent this from happening at the switch level instead of just disabling VMWare services?