I have a strange problem and I hope someone here can help me. Here is a brief explanation of the problem:
I have a Cisco 3550 layer 3 switch, which is configured with multiple Vlans and inter Vlan routing is enabled.Â Most of the Vlans have class C IP subnet (i.e, 192.168.2.0/24)addressing schemes and are working just fine.Â The clients that are members of these Vlans can access the resources in other subnets and access the Internet.Â I have a Vlan (named ExternalWiFi) that has an IP subnet scheme of 192.168.12.0/22 and is acting a bit strange. The member workstations of this Vlan, which receive an IP address within the range of 192.168.12.1 through 192.168.12.254, can access other Vlan resources as well as accessing the Internet.Â But, the clients who get an IP address in the range of 192.168.13.1 through 192.168.15.254 can't access the Internet.Â This Vlan is configured with the address of the dhcp server just like the other Vlans.Â The dhcp server is running on a Windows 2000 SP4 server and here is the info about the addressing scheme of ExternalWiFi vlan:
Network:Â Â 192.168.12.0/22
Gateway address: 192.168.12.1
Here is the result of the test that I did:
I put a host in ExternalWiFi Vlan and gave it a static IP address of 192.168.13.2/22 with gateway address of 192.168.12.1. I was able to ping hosts in same Vlan and other Vlans without any problem but I was not able to ping the host 192.168.2.3. This is the internal IP address of our firewall device and it is connected to port 3 of Cisco 3550 switch.
I have no problem pinging the FW from other /24 Vlans and I am also able to ping the FW from a host with an ip address in range of 192.168.12.1 through 192.168.12.254. The problem starts when client gets an ip address of 192.168.13.1 and above. I am very sure the same problem applies to our other /22 Vlans.
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