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Port forwarding possible? (not port range!)

Discussion in 'Cisco/Linksys Wireless Routers' started by kutyafal, May 14, 2004.

  1. kutyafal

    kutyafal Network Guru Member

    I'm switching from the BEFW11S4 to the WRT54G and it seems this one doesn't have individual port forwarding or UPnP port forwarding (that is managable).

    What I'm trying to do (and have been doing with the BEF model) is to forward port 3389 (remote control) to several different computers on my lan. Basically by typing in IP:port1 or IP:port2 or IP:port3 from work I can control different machines on my home lan because these ports are all forwarded to 3389 but each to different internal IPs.

    This has been working well on the BEFW11S4 but I need to switch to G wlan so I'm trying out the WRT54G and it seems this now doesn't have this feature. Is there any hacked or other firmware that would provide this feature? I don't know why they've removed this feature. I might need to look at a router from another company if I can't fix this cause I need this feature.
  2. Anonymous

    Anonymous Guest

    same here. I need Trigger Port feature.
  3. Anonymous

    Anonymous Guest

    I guess maybe it would be called "port translation"? Like incoming port X mapped to internal port Y. What other router do you guys recommend that has this feature? US Robotics, others?
  4. Anonymous

    Anonymous Guest

  5. Anonymous

    Anonymous Guest

    Hmmm, again... TomsNetworking review shows firmware 1.01.4, Jan. 27 2003. This must be an early firmware. Now, why was this feature removed?!!!
  6. Anonymous

    Anonymous Guest

    Hmmm, the third time... Just got off the phone with Linksys support and they said that starting with firmware 1.3x this feature was removed cuz it gave "GAMERS!" a problem... :roll:

    So they're emailing me older firmwares 1.4, 1.3 and 1.2. They said downgrade flash should be done in that order. I'm eager to see what bugs they had in these early versions. Btw, Tom should update his review... :roll:
  7. Esquire

    Esquire Mesquire Staff Member Member

    Sorry, but how is TomsNetworking's port forwarding:


    different from this?


    Or are you folks referring to a feature that isn't there?
  8. Anonymous

    Anonymous Guest

    You're right! I mislooked the picture. However, they are saying that the earlier firmwares have a button for port triggering. Well I'll see when I get the files...
  9. kutyafal

    kutyafal Network Guru Member

    Anybody has any info on this? Any of the hacked firmwares support this? Multiple incoming ports to the same internal port on multiple machines... please!

    Right now I'm using a MS MN-700 router as an AP connected to the old Linksys router just for the 11g connection on one machine. I'd rather not keep this setup.
  10. gmartin

    gmartin Network Guru Member

    Port forwarding with ssh

    I recently switched from the BEFW to wrt54 and ran into this iissue. Fortunately for me, I run a linux workstation for fun and solve it using ssh. SSH allows you to build tunnels into your network. So now I fire up my putty client and it is set to forward 3389 to my winxp pc and 119 to my verizon news server.

    It's very slick and quite secure.

  11. dadmin

    dadmin Network Guru Member

    If you're comfortable using telnet you can go into the shell and use the iptables command to do what you want. The format would be something like this if you wanted to use an external port of 80 to map to the internal remote desktop port of 3389:

    iptables -t nat -I PREROUTING -p tcp -i eth1 -d <wan ip> --dport 80 -j DNAT --to <lan ip>:3389

    iptables -t nat -I PREROUTING -p udp -i eth1 -d <wan ip> --dport 80 -j DNAT --to <lan ip>:3389

    If you have a v2 or GS you need to replace eth1 with vlan1. For <wan ip> use the public ip assigned by your isp. The <lan ip> should be the internal ip address of the machine running remote desktop.
  12. DaMac

    DaMac Guest

    I am a new user with a WRT54GS so I don't know if this will help, or apply to you or others that might be reading this.

    One port can be forwarded by using the same port number in start and end port numbers.

    As far as the UPnP Ports, If you open up your web broswer to (Subsitute your routers IP if necessary)
    it should be the UPnP page that your use to.

    Interestingly there is also the Triggering Page:

    I updated firmware to Satori-4.0 before I accessed the UPnP/ Triggering pages so I don't know if it was there with the Factory Linksys Firmware. Also I haven't tested the feature (I don't have a use for it myself). The feature may or may not be active (might be legacy code from previous versions)

    Now that I have said that I will have to try that sometime.... If anybody else that has a chance to try this I would be interested to know if this feature is "hidden" in the earlier models as well.
  13. Toril

    Toril Network Guru Member

    There's several different ways to do this ... You can use a better remote desktop util like VNC, it allows you to choose different ports for each machine. Remote desktop is quite limited in this matter.

    Or, there's a PPTP vpn server in the Satori 4.0 firmware, you could VPN in, thus giving yourself a virtual IP on your local network, and remote desktop to any machine you want.

    Or, you could setup a linux box, and a sshd server (actually I think you can do this with the sshd on the WRT54G, not sure) and use a ssh tunnel. So localhost:5000 -> remote IP1:3389, localhost:2000 -> remote ip2:3389 ... I've actually tried this without any luck, because, surprise, remote desktop again is limited and gets confused when you try to remote desktop to "localhost" (obvisously the folks who designed it never thought of ssh tunnels).

    Ssh tunnels and VPN are probably an even better way to go, because not only do you have nice remote desktop capabilities, but it's encrypted to boot.

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