Reverse Router Into Bridge?

February 13, 2009 at 21:30:29
Specs: Microsoft Windows XP Professional x64 Edition, 3.368 GHz / 4095 MB
How hard would it be to reverse a Linksys or Dlink router into acting like a bridge and accept incoming connections and use the WAN or somthing as an internet exit. Flash the router or somthing?

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February 14, 2009 at 09:54:18
Assuming your talking about wireless routers;

If the router does not come with the firmware capability to do this, then you are correct, you would have to replace (or flash) the existing firmware with new firmware which provides that capability. This is the motivation many people have with replacing the factory firmware in these routers with 3rd party firmware like DD-WRT. The danger is "bricking" the router. If you try to do this and fail, it voids any warranty and the router will become a "brick" (only good for a doorstop).

I have done this with a couple of different routers for the exact purpose your talking about, using the wireless interface as the WAN connection. If the model of router you have has a very compatible 3rd party firmware available, then it's no more difficult than upgrading the firmware from the factory. That is a good way to get a taste of this, if your router has updated firmware available from the factory, go through the factory authorized upgrade procedure first. As for using the 3rd party stuff, you have to be very careful and study up on what your doing, because manufactuer will sometimes make internal changes to a router model and just change the version # making the firmware you think is correct not work (and then you "brick" your router...).

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February 14, 2009 at 10:03:08
Well... I got a stack of routers in my attic that are collecting and half of them are 802.11B so their old. Mostly Linksys, so if you fail you cant try again? Its liek a computers bios basically (only i have a tophat flash back thingy for my motherboard)

I looked at that WRT thing looked very complicated. Ive upgraded bios on motherboards and routers before.

How can I find if my model #s are good for this or not? Can I list them here?

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February 14, 2009 at 11:03:50
I have:

(1) DI-524 (A1)

(1) WRT54G Ver.2

(2) BEFW11S4 Ver.4

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Related Solutions

February 14, 2009 at 15:08:29
It's the same as flashing a BIOS on a motherboard, if there were a power failure in the middle of writing an update to a motherboard BIOS, the motherboard is usually toast unless you send it back to the factory or the BIOS chip is removeable and you get a good chip from the factory. If you have the proper special equipment you can restore a bad BIOS or firmware problem, but most of us don't have the specialized equipment to do that, so we can't just "try again".

Wireless routers usually are upgraded using the firmware on them. They have a web interface which you access through a browser. Within the web interface is a dialogue to upgrade the firmware. You have to be using the proper browser (or one that's compleatly compatible) and you just select to upgrade and the dialogue request the file to use. You point it to the file (just like uploading a file to the Internet) and it spends a minute or two rewriting the firmware in it's flash ram. If something happens while it's in the middle of re-writing it's firmware, or if the file itself is corrupted or incorrect in some way, the firmware in the flash ram becomes corrupted and will no longer boot the router. So, you no longer have a web interface to access. There's no way to communicate to the router unless you have the special equipment and interface software to "push" a new firmware correctly onto the flash ram.

The WRT54G is the original wireless router that DD-WRT was developed on (hence the name). One thing you can do is go to the linksys support page and download the latest firmware update for your model and carefully follow the linksys instructions for upgrading your firmware. That way, if it doesn't work out you can write to the linksys support and ask them to help you. After you've experienced upgrading the firmware using the factory firmware, then you can try using a 3rd party like DD-WRT, OpenWRT, whatever...

There's a pretty good overview of DD-WRT on wikipedia:
and at the bottom are links for more information about other 3rd party firmwares. The situation is, none of these freely available open source firmwares are going to be simple to use. That's intentional. If you read the FAQs and stuff, you will see that they ARE NOT wanting to encourage people who don't really know what they are doing from trying to do this. The people using their own time and efforts with no monetary compensation DO NOT want to hear from people, who didn't really spend any time or effort in learning what they are doing, complaining, "i tryed ur sofware an now my router don't work. what u gonna do about it. waaaa". If you want to do this for free, you are on your own. Otherwise, pay somebody to do it for you.

A Linksys WRT54G was the first router I did this with. I took the time and carefully identified the model and all other reference numbers. Then I read comments on forums from people who had done it on the same model,version,etc as I had and then downloaded the exact file they reported using and then just did the upgrade just like I'd done the Linksys upgrade. And it worked great. No problems. The router just booted up to this DD-WRT and then had all sorts of capabilities and configurations which the orginal Linksys firmware does not have. But, I was never totally confident that it was going to work until it did.

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February 14, 2009 at 15:15:05
I did it and I have it sucessfully running. Im having trouble setting it up for what I want though.

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February 14, 2009 at 18:50:01
Yes, the terminolgy used in DD-WRT is confusing, particularly with all the options it provides. You just have to start out with it in some sort of experimental setup and try stuff until you get it working like you want. I would suggest keeping notes about what changes you make until you learn what your doing.

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February 14, 2009 at 19:34:54
with making changes if I f--- it up I can just hard reset it right?

and I tried following some tutorial online with making a bridge thing I duno I got fustrated for today :)

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