Hi,
We have a 3750 as core switch. It has following vlans:- VLAN21 - 10.58.21.1/24 , VLAN41 - 10.58.41.1/24 , VLAN100 - 192.168.100.1/24 , VLAN201-172.16.1.0/30
All the servers in VLAN21 and VLAN41 are accessed by services and users from VLAN100 and within the same vlans.
Now, there is a firewall(non-cisco) which is to be placed logically between the users and the servers.
The server layer 3 vlans - VLAN21 - 10.58.21.1/24 and VLAN41 - 10.58.41.1/24 will be deleted from the 3750 and created on the firewall.
Route from 3750 is added for these; ip route 10.58.21.0 255.255.255.0 172.16.1.2 and
ip route 10.58.41.0 255.255.255.0 172.16.1.2
( 172.16.1.2 is the ip on the firewall interface connected to the 3750 , used for routing traffic across )
After this is done, we face a strange problem. Traffic within vlan 21 , eg. 10.58.21.10 and 10.58.21.20 are not able to communicate for application processing. The ping between these two is fine. From my understanding, these will only be switched at 3750, but it doesn't work.
As soon as the firewall is removed, the traffic works as usual.
Any possible reasons for this and what should be done to mitigate this.
Appreciate all help!
