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WAN Address

Discussion in 'Networks' started by Nelix, Dec 17, 2013.

  1. Nelix
    Honorary Member

    Nelix Gigabyte Poster

    Hi All

    It's been.... Ohhh, at least a few years since I frequented this place but was the first place I came to now that I need some assistance.

    I need to find the WAN/External IP address of a router we have here on site, easy you think, well let me explain.

    We have a linksys router in the lounge area for students to use after hours, the WAN port of the router plugs into our network and goes out through our DMZ & Proxy. So with this in mind the WAN address is one of our private addresses, We are now replacing the router with a wireless solution to cover the whole of our residential block, I cant log into the router as the previous IT tech set this up and no one knows the Login details, I want to give the controller for the new wireless solution the same IP as the current router.

    Does anyone know of any software that will tell me the WAN IP, tracert obviously just gives my the address for the gateway but I need to know what that address is translated/nat'ed to.

    Hope someone can help.
    Certifications: A+, 70-210, 70-290, 70-291
    WIP: 70-294
  2. GSteer

    GSteer Megabyte Poster

    Grab this: Free IP Scanner: a very fast IP scanner and port scanner.

    Then run it against the subnet where you believe the router resides (Edit: on the WAN side), takes just a minute. It should flag up with an open port for remote access, if it was enabled, even if not you'll get a ping response and IPScan will return the vendor ID from the OUI of the MAC which should then let you ID which unit the IP is on.

    That's my preferred scanner, it's standalone and does't require Java to be installed unlike some others I used to use.
    Last edited: Dec 17, 2013
    Certifications: BSc. (Comp. Sci.), MBCS, MCP [70-290], Specialist [74-324], Security+, Network+, A+, Tea Lord: Beverage Brewmaster | Courses: LFS101x Introduction to Linux (edX)
    WIP: CCNA Routing & Switching
  3. Sparky
    Highly Decorated Member Award

    Sparky Zettabyte Poster Moderator

    Does the router IP show up in the leases in your DHCP scope?
    Certifications: MSc MCSE MCSA:M MCSA:S MCITP:EA MCTS(x5) Security+ Network+ A+
    WIP: Exchange 2007\2010
  4. Cunningfox

    Cunningfox Byte Poster

    The linksys probably has a mac address written on the bottom of it, you should be able to trace the mac address through the network (if not exactly that one it'll be it +/- 1 or 2. Failing that you should know what device and port that linksys device is plugged into having a look at it's mac address table will confirm it's mac address. Once you have that you can find the IP in the ARP table.
    Certifications: CCNP, CCNA, MCP
    WIP: ??
  5. danielno8

    danielno8 Gigabyte Poster

    If you have access to the device the Linksys is connected to, depending what type of device it is you should be able find this through a combination of MAC tables and arp cache.
    Certifications: CCENT, CCNA

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