WRT54G config- turn it into a wireless switch?

Discussion in 'Cisco/Linksys Wireless Routers' started by gizmomelb, Apr 25, 2005.

  1. gizmomelb

    gizmomelb Network Guru Member

    Hi all,

    I've got a WRT54G v2.0 (linksys firmware v3.03) and what I'm basically wanting to do is configure it as a wireless network switch.

    currently my network setup is:

    ADSL modem
    5 port 10/100 switch
    | |
    V V
    computer 1 computer 2

    The ADSL modem has a built-on router and is already configured to auto login, port forward, it has UPnP enabled and an SPI firewall. The 2x computers are on static IPs in the 192.168.1.x range. I've added a wireless NIC to my girlfriend's laptop so she can also access the internet when she wants, hence the reason I bought a WRT54G.

    Basically the easiest config for me is to set the WRT54G to a wireless switch (ie: disable the routing, NAT etc. on the WRT54G and plug the ADSL and 2x wired computers into the 4 port switch on the back of the WRT54G. ie: not use the WAN port on the WRT54G). Is this possible?

    I tried setting the WRT54G to a static IP (ADSL:, WAN:, LAN:, disable WRT54G DHCP server, disable BLOCK WAN REQUEST) and connecting my wired computers and the ADSL to the WRT switch, but that did not work.

    I tried connecting the ADSL modem to the WAN on the WRT with the static IPs listed above (gateway and DNS set to the of the ADSL modem) but still no traffic could access outside of the modem.

    I tried setting the WRT to DHCP client on the WAN, but still no outside traffic. I'm also getting UPnP failure from my P2P client on one of the PCs.

    The switch on the back of the WRT does not appear to work as a normal switch, only as routed traffic - can anyone confirm/deny this?

    Is there a way to configure the WRT how I want (so I do not have to change my ADSL router settings, port forwardings etc.), or will I need to change the staic IP range for my LAN from 192.168.1.x to 192.168.2.x and have the ADSL port forward to the WRT, then have the WRT port forward to my new (x.x.2.x) static IP?

    I'm looking over the abilities of the Alchemy firmware but it doesn't seem to do what I want either.

    I would prefer to keep the ADSL modem doing the auto login and firewalling etc. if possible, or am I barking p the wrong tree?

    Also would it be better to change my internal LAN IP to x.x.2.x range, with port forward from the ADSL to the WRT, then port forward on the WRT to the new x.x.2.x IPs, while enabling BLOCK WAN REQUEST on the WRT54G so that there are two firewalls active on my LAN. ie: if someone breaches the ADSL modem, then they hit an invisible network on the other side of it?

    any comments/help most appreciated.

  2. Gandalf_SX1

    Gandalf_SX1 Network Guru Member

    here's how you do it,
    you set the IP of the router for example to as your case, then in the setup window set the local IP address to the same, disable all the WRT function from DHCP to UPNP everything must be disabled,
    then get a straight cable (NOT CROSSOVER) connect the WRT to the modem using the 1st LAN port
    that must do the trick i'm using it as an AP with IPCOP and it's working, when i tried using a crossover cable instead of a straight one, i could browse the LAN but not the internet

    tell me if it didn't work
  3. gizmomelb

    gizmomelb Network Guru Member


    many thanks for that! worked perfectly! I've now replaced my 5 port switch with the WRT54G and the wired and wireless network is working fine. much obliged.

  4. Guyfromhe

    Guyfromhe Network Guru Member

    the cable can't affect the types of packets you can send, it doesn't matter if it's straightthrough or crossover...
  5. Gandalf_SX1

    Gandalf_SX1 Network Guru Member

    well for me it does, i have a linux PC as a main router ( IPCOP ) and i wasted 3 days on it without success ( DHCP don't work, OUTSIDE pings don't work etc.. etc... ), but when i tried straight it worked
    see this post also

    no problem :D
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