Can't reach devices on same vlan

[kramerz]

Hi,

The design is the following.

(Site A#) Watchguard/computer <---L2---> (Site B#) HP Procurve <---> computers, printers (About 10 devices)
The L2 connection is provided by our isp and is not on the same site.

The problem is that we loosing connectivty to some devices on site B randomly, sometimes it works fine and then it stops working. At the same time we can reach some devices from site A. The computers always have connectivty to site A but other devices particularly the printers and sometimes the switch which cant be reached at all from site A. However when trying to ping from a local pc at site B they can reach the devices but we cant reach them from site A at all.

I can see the arp table populate fine from the pc/watchguard at site A with the correct mac adresses but dosn't get any ping reply from these devices.

Any input is appreciated!

 

[cajuntank]

Watchguard/computer??? Are you saying this computer is acting as a router/firewall? Is the site B switch not connected to a site A switch?

 

[VinceWhirlwind]

This sounds just like a similar problem posted here a few weeks ago.

If you have a layer2 link across an ISP, you are sending L2 broadcast traffic across your WAN link. If the ISP only supports a set number of MAC addresses in their MAC address table for your VLAN, then only some devices will have connectivity at any given time.