3750 arp issue ?

[Tejas Kunte]

pls refer to the attached network diagram

my application delivery controllers are connected to a 3750 stack thru imperva web application firewalls operating in bridge mode (essentially a bump in the wire, not doing stp)

the problem is my ADCs cannot communicate with each other, even though the arp entries populate on the switch in the correct vlan

if i remove the imperva's everything works fine

any idea what logs i can check on the 3750

[Mark Malone]

Hi It sounds like the imperva is the problem not the switch , if the switch has received a mac address from the unit(its not incomplete) and resolved it to arp its working as it should , the question is why the adcs cant communicate through these firewalls there must be a setting on them preventing it.

As you said remove them theres no issue with the adcs communicating so the switch is not the fault traffic sounds like its blocked by the imperva unit , I cant offer advice on that unit have not come across them before im just thinking from a logical point of the setup and what you have said above

I would be investigating the imperva rather than the switch