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I have configured a Catalyst 3750G with 2 VLANs. VLAN10 is configured with an IP address of 192.168.10.1 and VLAN20 is using 192.168.20.1. Workstations on VLAN10 use IP addresses from 192.168.10.2 to 200 and VLAN20 workstations use 192.168.20.2 to 200. The workstations are setup with their gateways pointing to their respective VLAN's IP address. IP routing is configured so both VLANs can communicate with each other. Workstations on both VLANs have no problems pinging each other so inter-VLAN routing works fine. The problem I have is that I have a network device that has an unconfigurable gateway setting. That device resides on VLAN10 and the workstations on that VLAN can communicate with that device but the workstations on VLAN20 are not able to communicate with that device. What must I configure so that the workstations on VLAN20 are able to communicate with the unconfigurable gateway device on VLAN10?

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  • usavmony
    usavmony Aug 30, 2010

    I cannot change the device's IP. The device is managed by another group that is not willing to change IPs and their devices (custom made devices) are engineered to collect data and broadcast the info on the 192.168.10.x subnet but their devices cannot be configured with gateway info so I am not sure how to instruct VLAN10 to forward the broadcasts to VLAN20. Is bridging the VLANs an option? How about creating a route table that includes the devices' IP addresses to route to VLAN20 and vice versa?

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I would suggest you to give it an ip 192.168.30.1 and then give a tracert command from both the vlans clients and let me know the output. Further if you will let me know the device which you are trying to configure then my solution will be more accurate.

Posted on Aug 29, 2010

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