DHCP Problem

Discussion in 'Cisco/Linksys Wireless Routers' started by jl9294, Aug 13, 2006.

  1. jl9294

    jl9294 Network Guru Member

    I have a wrt54g v3 router that I just flashed to the new ddwrt mini generic firmware. I do a lot of port forwarding and what seems to happen is the router will be up for 4-5 hours then all of a sudden my machines get a new internal ip address from the router. This really messes with my port forwarding so is there something I can do to help with this.
  2. swinn

    swinn Network Guru Member

    What version and build of DD-WRT did you flash it with? Did you reset your router after flashing it? Generally it won't reassign new IP addresses to your clients if they are just renewing the lease.

    The safe thing to do since you are port forwarding is to either set your clients with static IP addresses or use static DHCP on the router to make sure they always get the same IPs (Administration->Services->DHCP Server).
  3. jl9294

    jl9294 Network Guru Member

    I flashed with ddwrt v23 sp1 mini generic firmware and I did reset afterward(manually) and it seems the connection very briefly(less than 30 seconds) drops after 4-5 hours just long enough to give me new ips. Do you think I should flash to the ddwrt v23 sp1 wrt54g firmware now. Thanks for the help
  4. swinn

    swinn Network Guru Member

    I personally prefer the SP2 builds and the current 8/11 one is stable and very nice. Among other things, SP2 adds fixes to DNSMasq which would probably solve the changing IP address problem you are having. If you do upgrade to SP2 be sure to reset to the default settings again.

    You should use the generic version when flashing using your browser. The model specific versions are intended for tftp only. I would also use the standard version instead of the mini since you have a v3.. the standard version will give you the rest of the features of the firmware and I cannot remember what the mini doesn't have compared to the standard. I remember when I last looked at the mini version that it didn't have everything I needed.

    I still would recommend setting your computers to use a static IP address either directly or by using static DHCP on the router (not sure if mini has that or not). Static DHCP is found at Administration->Services->DHCP Server.
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