Brocade Communications Systems IP250 user manual Finding IP addresses, Select Tools Address Finder

8 Address Finder

If a workstation is connected to a third-party device, and that device is connected to a IronWare or Network OS device, then Address Finder should be able to report the downstream port from which that traffic is coming (that is, the port to which the third-party device is connected), as long as the workstation is sending traffic that passes through the IronWare or Network OS device.

This directional information indicates which device interface can be used to reach the target MAC address. By combining this information with the knowledge of the network topology, you can trace a path from a device to the wireless client in question.

Address Finder finds MAC addresses that are in the forwarding tables at the moment when the search is performed.

You can use Address Finder if you have the Address Finder privilege in your user account or role. For more information about privileges, refer to “User Privileges” on page 1283.

Finding IP addresses

NOTE

Address Finder is only supported on Network OS products running 3.0 or later.

When searching for an IP address, Address Finder sends a couple of packets to the target IP address to prime Address Resolution Protocol (ARP) caches. It then looks in the Management application database to find all the Layer 3 devices on the target subnet, and then queries the ARP table of each one to find the target IP address. The result of the query provides the corresponding MAC address. Once the MAC address is known, then the MAC address is searched for in the learned MAC address tables of each device that is in the database that has an IP address on the same subnet as the target IP address. To find a MAC address, refer to “Finding MAC addresses” on page 304.

To find an IP address, complete the following steps.

1.Click the IP tab.

2.Select Tools > Address Finder.

The Address Finder dialog box displays.

FIGURE 127 Address Finder dialog box

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