I'm attempting to provide access from one FWSM to another, using VLAN's and ACL's. the purpose is to allow a set of servers behind one firewall, to use DNS appliances behind another firewall. Here is some basic config info:
FIREWALL A = VLAN 1 - Host VLAN
FIREWALL B = VLAN 2 - DNS Appliance VLAN
FIREWALL A&B VLAN 3 - Transit VLAN between 2 FWSM
ACL is open to VLAN 1, allowing port 53 TCP/UDP connections from all hosts in the subnet.
ACL is open to VLAN 3, allowing the traffic through the interface at FW-B.
I am able to observe the traffic (through captures) up through VLAN 3. Once I start capturing on FW-B VLAN 2, I see nothing. No traffic at all...
Any thoughts off hand? something I've missed?