Creating a *routed* wireless network

Discussion in 'Networking Issues' started by cgreentx, Jul 25, 2005.

  1. cgreentx

    cgreentx Network Guru Member

    I would like to connect two buildings, but I do not want to bridge them. I would like it to operate as a routed WAN. Is there a way to do this with stock firmware, third-party firmware, or otherwise? It seems like a simple task if the firmware has the features.


    Chris Green
  2. jjmack

    jjmack Network Guru Member

    Please check out the posting I added yesterday that is titled:
    "Cascading Linksys routers on a single network" :p
  3. cgreentx

    cgreentx Network Guru Member

    Unless I totally mis-reaad your posting, that was not what i'm looking for. I'm looking ot create a point to point WAN without bridging the networks.


    Chris Green
  4. windsurfer

    windsurfer Network Guru Member

  5. cgreentx

    cgreentx Network Guru Member

    Well, most of that thread seems full of people who don't even really understand what routing *is*.... however, I think that it confirms what I needed to know. The key for me is that a "routed" mode exists on the AP's with third-party firmware and i'll be able to configure them for a routed link (no NAT) between the WAN and LAN interfaces. Beyond that I can handle it on my own. :)

    Chris Green
  6. davidsonf

    davidsonf Network Guru Member

    Even with the Linksys stock firmware what you have asked about can be done. The routing is only between the WLAN port and the bridge (which has all of the LAN ports and the Wireless connected to it).

    If you get third party firmware, it is not trivial and requires someone who understand Linux systems administration and shell scripting, but it is entirely possible to reconfigure the VLAN and/or the bridge to have routing between just about any one or more of the 5 ethernet ports and the wireless.
  7. cgreentx

    cgreentx Network Guru Member

    Interesting to note. I will most likely run a third-party to control power output to make up for the 20-30 ft of LMR 400 I'll be using. Sounds as thought setting a routing table in the firmware and turning off NAT is trivial to do. Works for me.

    Chris Green
  8. davidsonf

    davidsonf Network Guru Member

    Should be good.

    Do note that 30 feet of LMR-400 will have about 2 dB loss, and hence is about the maximum length you'd want to use. You can crank up the transmit power, but that doesn't help the receiver at all!

    Because it will attenuate the received signal, when the transmit power is increased to match the line loss the result almost guarantees that at the fringes of your coverage it will be a low received signal that kills the connection, not the level of the transmit signal.

    While I normally suggest anything from 3 to 6 dB power increase as being potentially useful, the loss of received signal reduces that by an equal amount. Hence the useful power range, into 30 feet of LMR-400, might be 1 to 4 dB higher than the 28 mW default. That's a range of about 35 mW to about 71 mW. The high end of that range gives you a transmitted signal that, if all else is equal, will have a range of about twice the distance that your receiver does. (Thus being a wasteful source of interference... :)
  9. Fluxor

    Fluxor Network Guru Member

    As long as he uses a good antenna 2db shouldn't matter.
  10. cgreentx

    cgreentx Network Guru Member

    I've continued looking into this and found tons of info out there, but most of the info doesn't really get into what I'm trying to do. Since the Linksys firmwares support both gateway mode and routed mode do you think i can put both WRT54G's in "routed" mode and bridge them together creating what i would traditionally create as a routed network?

    LAN2 -> WRT54G -> Wireless Subnet/Bridge -> WRT54G -> LAN1

    I want full passthrough routing with no NAT in this configuration, and I don't mind at all using a dummy subnet between them on the wireless.

    I get the impression from your posts above that this would be possible with stock firmware plugging the LAN's into the WAN port and using the wireless as the WAN bridge.

    Chris Green
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