We currently have a layer 3 switch/3750g with various vlans/svi's. All appears to be working fine. We have a device which requires port 4000 UDP to be forwarded across vlans. We already have ip helper; however, this opens 8 default ports. (DHCP is working fine). I used the ip forward-protocol udp 4000 global command; however, the installer still can't find its device located in another vlan during its install. Long as both are in same vlan, installer is happy/works fine. Wireshark shows destination port 4000 and source increments, such as 1271, 1272, etc. I don't believe the source is important, only since destination is 4000 and dealing with UDP. Any idea's on how to get port 4000 UDP to traverse vlans?