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DHCP - Strange Names

Discussion in 'Networking' started by brianjj, Mar 25, 2008.

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  1. brianjj

    brianjj Thread Starter

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    Since activating DHCP on my Windows 2003 Server, I'm starting to see some really strange names associated with my IP addresses. Even after I delete them, they somehow show up again. I have attached a screen shot of the strange names. I blocked out the valid names for security purposes. Is there something that could be assigning the IP addresses to these unknown machines? And is there a way to avoid this in the future? Thanks in advance.
     

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  2. Courtneyc

    Courtneyc

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    That's because any device that requests an IP address will be allowed one on your server. If I brought my laptop into your building and plugged it in, I would get an IP address (doesn't matter if I have access to your actual network). That's the nature of the beast. DHCP uses broadcasts to give out IP addresses.

    If someone is connecting to your network wirelessly (with a laptop or even a cell phone) they will also get an IP address. It will stay there as long as the lease allows.

    Courtney
     
  3. Frank4d

    Frank4d Retired Trusted Advisor

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    It appears you have unknown computers connected to your network and your Windows 2003 Server is giving them IP addresses. Am I missing something?
     
  4. brianjj

    brianjj Thread Starter

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    Thanks for the response. We have a small office that is actually part of a larger office building, so that does make sense that it would pick up other devices. That being the case, are there any recommendations to prevent or manage this? I have a feeling that this could get worse, based on the number of surrounding offices. Some days, I have hundreds of these strange names. Should I maybe look at a different DHCP product, assign static IP addresses, shorten my lease times, etc.
     
  5. JohnWill

    JohnWill Retired Moderator

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    A properly managed firewall will do a lot. Do you have a domain login?
     
  6. brianjj

    brianjj Thread Starter

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    Yes, I believe we are running a Netgear Firewall. Yes, I do have a domain login. This might be a dumb question, but how do I isolate the addresses on the Firewall.
     
  7. rhynes

    rhynes

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    Are you by chance running wireless?
     
  8. brianjj

    brianjj Thread Starter

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    Good question. I do have a wireless router, but the DHCP part is turned off. My regular router is a Netgear, which is connected to a couple of Dell switches. I actually did wonder if those strange names are actually coming from the wireless router.
     
  9. rhynes

    rhynes

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    Well there's your problem. If you're not using the wireless, shut it down. If you are, start using wpa for security.
     
  10. jmwills

    jmwills

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    Yes, you have freeloaders on your network. The T-60 is an indicator as this is an IBM laptop.

    Use WPA with a STRONG password and chnage the default password ont he router so no changes can be made. No other measures are needed.
     
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