Hi,
I’m new to VLANs and had some questions. Our CT office outgrew our Class C subnet so we decided to add two VLANs to break out about 80 users from our rapidly multiplying servers and leave some room for growth.
I finally got the VLANs working on an HP Procurve 2900 Layer 3 Switch. .100 was the original subnet, we added .400 and .401. They are all untagged, .100 uses our firewall as it’s default gateway and .400 and .401 use the IPs created by the Switch during the VLAN setup as GWs. There is a route back on the Firewall (which acts as our router) to .400 and .401 through the Switch’s .100 address. If we wanted to use the Firewall’s router instead of the Switch I would plug the Firewall into one of the ports on the switch, turn on tagging and join it to all three VLANs and add virtual interfaces on the Firewall with the corresponding subnets and tags, right?
Also, how can I get a DHCP server in the .100 subnet / VLAN (that’s where our VMWare servers are) to correctly process requests from all 3 VLANs? Do I again have to use tagging? I tried using the IP-Helper feature on the Switch but my new DHCP server for .400 gave out (wrong) addresses to the .100 subnet too.
