WARNING NEWB: Address Reservation ?

Discussion in 'Cisco/Linksys Wireless Routers' started by BassKozz, Dec 9, 2005.

  1. BassKozz

    BassKozz Network Guru Member

    I jusy installed my new WRT54G v3.1 (Stock Firmware: v4.20.7)...
    I upgraded from a Netgear WGR614.

    I ran into a little problem I can't seem to find a solution for. On my netgear router there was a section called "Address Reservation" where I could tell the DHCP server to keep the IP addresses on certain devices STATIC on my LAN (based upon MAC)... I can't seem to find a way to do this on the Linksys, and I have set & re-set port forwarding a couple of times, and I am sick of it :sad:

    1. How can I set static LAN IP numbers for my devices (Computers, ReplayTV's, etc...) ?
    2. For Security Reasons: Is it bad to set a static LAN IP address for computers on a Local Area Network?

    Thanks in advance,
  2. swinn

    swinn Network Guru Member

    The Linksys firmware does not support static DHCP. You will need to upgrade your firmware to HyperWRT Tofu (current version 11), which does offer that feature plus many more.

    If DHCP is enabled then I don't feel it makes much difference if you use dynamic IPs or static IPs. I use a combination of both.

  3. Esquire

    Esquire Mesquire Staff Member Member

  4. BassKozz

    BassKozz Network Guru Member

    Thanks for your post, but I am a little wery of using thirdparty FW, but if this is my only option, why HyperWRT ?


    This would work great for my computers, but I also have NON-computer devices on my network that I need to set a static IP address for (For example my ReplayTV).

    So this won't work :cry:

    Is there a way to set the port forwarding up to follow the device ?
    (i.e. port forwarding based upon MAC address)
    because then I could leave my ReplayTV's in a dynamic setting and have the port forwarding follow.

    Actually I take that back that won't work either.... I NEED to keep a couple of my devices in a STATIC setting.

    Is there anyway to do this w/o third party firmware ?

    Thanks in advance,
  5. dellsweig

    dellsweig Network Guru Member

    The ONLY way to do static IP reservations is with one of the third party firmwares

    Look at:

    hyperWRT - very close to Linksys stock firmware but with a few nice added features

    dd-wrt - way improved over stock linksys. Newer Linux kernel, newer GUI, lota of features

    Several others but this is a good start.

    Dont worry about 3rd party - there is nothing magical or special about the Linksys firmware and you can always load it back on.

    If you ever did need warrenty service I doubt Linksys even turns on your router before sending you the replacement.
  6. NateHoy

    NateHoy Network Guru Member

    HyperWRT is the closest to the Linksys firmware. It uses the Linksys firmware as its base, and simply adds features like Static DHCP, while still offering the familiar look and feel of the native code.

    It's a great choice for people who are uncomfortable with third party firmware, as it looks just like the native stuff, only with GOBS of additional features.

    Short answer - no. You can manually set static IP addresses, then port forward to them, but as you've probably discovered by now the ReplayTV cannot "keep" a static IP address if it detects a DHCP server - this is a known bug in the VXWORKS operating system that the ReplayTV's use.

    Until I loaded HyperWRT, I had to unplug all of my devices from my router when I restarted it, then plug in the ReplayTV *first* to ensure that it was assigned the first IP address in the range. Then my computer, which needed the second one so I could do port forwarding for BitTorrent, then my other devices. It didn't always work perfectly even when I did follow that procedure, and it was a PAIN.

    No one supports "routing packets by MAC", and the best you can hope for is static IP by MAC (aka. "Static DHCP"), and then forwarded ports by IP. For that, you need third party firmware.

    HyperWRT Tofu was, for me, a simple matter of downloading it and doing a standard firmware update, then pressing the reset button for 30 seconds on the router to be sure the memory was clean, then re-entering my configuration. There is risk, sure, but read the forums on how many people have made an unrecoverable brick from using HyperWRT. You won't find many.
  7. BassKozz

    BassKozz Network Guru Member

    I don't understand why Linksys wouldn't provide this as a feature of it's routers/firmware ?

    Is Static DHCP a security issue ?


    Ok It's time to face the facts, I am going to haveta install a 3rd party firmware, so after reviewing the 3rd Party Firmware Comparison, I think I am going to have to go with DD-WRT, because it has a couple of features I would like to utilize that Hyper-WRT doesn't have...
    Loopback support (This will help me w/ sending ReplayTV shows from unit to unit over LAN)
    SNMP (never used it but I'd like to have it available)

    Couple of questions:
    Comparision Table
    Whats the difference between these ? Whats Progressive Port Forwarding?

    How stable is DD-WRT v22 ? v23 (beta) ?
    -Should I go with a final version22 or is beta v23 stable

    What's the ETA on the Final v23 ?


    Thanks for all your help, I really appreciate it... you have no idea! :thumbup:
    Thanks, you guys rock :rockon: !!!
  8. dellsweig

    dellsweig Network Guru Member

    Well - as far as I know static assignments are not a security issue - in fact it may enhance security as you can control IP addressing from a central location - with more granularity than simply assigning addresses from a pool

    Progressive port forwarding: Instead of giving you a web screen with 20 empty input fields, DD-WRT gives you an 'add' button to make as many entries as you need.

    V22 vrs: V23 - I stopped using V22 as soon as V23 became stable
    I am currently using both the mini and standard builds of V23 12/06 build. There are a few open issues but they are being worked on.

    My gut feel is we will see a final release by years end - this is completly driven by us finding 'bugs'.

    Have you looked at the bug trak system??
  9. noladrillos

    noladrillos Network Guru Member

    Run another DHCP server on your LAN and disable the DHCP server on your router. There are several free full featured DHCP servers you can run on Linux or Windoz boxes.
  10. Esquire

    Esquire Mesquire Staff Member Member

    I find the Linksys firmware can have a static IP of sorts if you limit the amount of IP addresses DHCP can dish out to a minimum.

    I have 7 computers on my network, 2 of which get switched on every day; the rest are as needed, sometimes about once a month. I have been limiting my DHCP to 7 IPs and the assignemnts don't change until the router is reset - thereafter it is reassigned according to which computer reconnects first. I have tried this setup with a few WRT54G units and they all appear to behave this way.

    This may or may not work for you but it's worth a try.
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