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WRV54G DHCP Client table

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by sec39, Jan 17, 2006.

  1. sec39

    sec39 Network Guru Member

    I've managed to get the WRV54G working with VPN access thanks to this forum. It has been a great help.

    However, there is a wireless computer on the network that will not obtain an IP from the router. I have disabled DHCP and re-enabled it. There always seems to be a rogue entry in the DHCP client table. The only work around that I have found right now is to assign it a static IP. Is there any way to clear out all DHCP address in the router? Here is the DHCP table with the rogue entry.

    vaiolaptop 10.184.38.101 00:0e:35:a4:00:00 Expire

    As long as that entry is in the DHCP table, the laptop is not able to reget a new IP. Is there any way to fix this? Thanks!
     
  2. DocLarge

    DocLarge Super Moderator Staff Member Member

    If you have a "rogue" entry, you may have someone tapping into your connection, my man, due to broadcasting DHCP in clear text...

    So, I would *AHEM* HIGHLY suggest you use encryption, change your default SSID, if you haven't, and/or use a static IP address because "rougue" entry's are nothing more than people hopping onto your connection because you haven't secured your site...

    Doc
     
  3. sec39

    sec39 Network Guru Member

    Thanks for the response Doc.. I guess I should better rephrase what I posted and use "rogue" lightly next time. The Mac address listed on the DHCP table is the same one listed on the laptop.. along with the machine name too. When I set the laptop to get an IP, it tries to find one from the router and then just fails. Plus it is quite odd that the DHCP lease says it has expired, but hasn't let go of the IP.

    Not to be naive or anything, I don't think anyone is hacking into my site. There isn't another house for a few hundred yards. I could be wrong though, I'll look into it more.
     
  4. DocLarge

    DocLarge Super Moderator Staff Member Member

    If your use of the word "rogue" is your own computer, then disregard what I said, I was under the impression the computer coming up was another one and not "your own."

    Try doing and ipconfig /release and then an ipconfig /renew on your laptop if you haven't already tried that to see what happens...
     
  5. moot

    moot LI Guru Member

    Just replaced my old router with the WRT54G.
    At this time I have two computers and a print server connected.
    When I check the DHCP Client Table it is empty.
    Should I see wired and wireless addresses issued?
     
  6. moot

    moot LI Guru Member

    DHCP Clients Table

    ok. The wife just came home with the laptop. I connected wireless and did see the laptop in the table.
    Guess only wireless DHCP assignments are shown.
    If it says 'DHCP Clients Table' - why doesn't it show all addresses issued?
    Nice to know ALL clients on the network... just in case you have to kick one off... :wink:
     
  7. moot

    moot LI Guru Member

    DHCP Clients Table

    Well, this morning all DHCP addresses were in table.
    Only reason I can see is that the wired PC's where not put into the table until the lease was renewed:confused:
    The wireless device showed as soon as connected.:)
     

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