Wrt54g setup wireless bridge




















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If you are located outside of the United States, or if Section 17 does not apply to you or is otherwise unenforceable as adjudicated by a court of competent jurisdiction, then Section 18 applies to you:. So the main router doesn't know about all the devices in the client network, it only sees the client router with the address So with this setup the computers in the client network can contact any computer in the main network or the internet, because all externally addressed packets are forwarded by the client router to the main router Now the tricky part is how to route packets originating in the main network to computers in the client network.

This is tricky because the main router doesn't know about these computers and their addresses. In fact, it doesn't even know that the That's why I need to manually add a routing table entry which says - "send all packets addressed to Now, normally the wrt54g should not accept packets addressed directly to its local private network, because all the packets it sends are NATed, so all replies should come addressed to its external address.

But the special magic of "client mode" is that the wrt54g accepts packets addressed to its own private network, and forwards them to the appropriate attached PC. I hope you understand it now. If you want to understand better, here's the routing tables of PC-1, PC-2 and wrt54g. Originally posted by: user Second, wrt54g is operating in a special "client mode" which is not AP mode - these are two different modes you can choose between with this firmware.

Originally posted by: VirtualLarry It then makes sense, if the PCs behind the client AP are on a different IP subnet than those PCs connected to the wired ports on the "main" AP, then by default IP packets sent out from the "main" AP would get routed to the default gateway, which is the WAN interface, and they wouldn't go anywhere, so you have to manually configure the routing to assign the gateway for the client AP's local subnet to be the IP of the client AP's wireless interface, so that the packets will reach there.

Or I might have that slightly wrong, maybe the gateway for that subnet would be the "main" AP's wireless interface. Now this is starting to make some sense. In fact, it would seem that the above probably would not work at all, if all of the devices, both the ones wired to the "main" AP, as well as ones wired to the client AP, were all on the same subnet. They have to be different subnets.

But NAT has nothing directly to do with anything either, since no layer-3 address-translation seems to be needed nor happening. If so, then my theory fits. Edit: In case it wasn't totally clear, what I'm suggesting is really going on here is slightly different than NAT.

Normally, all machines behind a NAT are on a local subnet with private IPs, and from the outside, there is only a single public IP address. In this case, it's a little different, from the outside, there is only a single MAC address visible, that of the client AP's wireless interface, but it appears to have multiple IP addresses, in fact all of the IPs of the machines behind it.

The client AP recieves the frames with its own wireless MAC as the destination address, containing an IP packet with a destination IP that actually belongs to another machine, but to the outside, it appears to belong to the client AP.

So it re-sends the ethernet frame containing that IP packet, except over the wired interface, with a destination MAC of the correct PC that corresponds with that destination IP on the local wired ethernet segment. I already heard from at least two other people that got it to work, but anyone else which does it, please post your experience here.

I have no doublt it will work with any existing wireless router that is, the wrt54g will serve as a wireless bridge , but would still like to hear if it worked for you without problems.

Originally posted by: user Bingo!!! Houston, we have lift off!! You are finally getting it, what you said in tha paragraph is exactly right except what you said in parenthesis at the end. Originally posted by: user I still think NAT is being done by the client AP, as the PCs in the client network are on a different private subnet, which the main router doesn't know about. So I think the client router is translating between those private network addresses e.

This is called NAT n-to-1 mode which linux kernel performs natively. Originally posted by: user Not sure how to do this on linux, but I can check the logs on the main router yep, the DI is quite a nice router, for sure which show all the connected wired and wireless clients by MAC address, and the only wireless client listed as currently connected is the client AP wrt54g mac address.

Does that answer your question? Originally posted by: user I think you can call this a double NATed configuration, which is how skyking correctly described it all along. I would think that normally these packets should be blocked by a NAT router. The links below describe essentially the same thing as what I did, but in a little less clear and concise fashion. I just wanted to give people a simple one-stop-shop guide so they don't have to chase around bits and pieces of information, or try out an endless number of configurations, which could be quite daunting to people with little networking knowledge.

Did you catually read the first paragraph of this sveasoft documentation page? The wireless mode list box shown has 3 options - AP, Client, and Ad-hoc. I've been using Client mode, not AP mode. In this mode you cannot connect to the WRT54G that is in client mode using another wireless client device".

And "AP mode: This is the default mode. It acts like a half-duplex HUB in the wired networks". I've been using client mode not AP mode! And btw, NAT is "network address translation", which is happening here. Don't get confused by the routing entry I added. In fact, it would be simpler to understand the setup without it.

In that case, the hosts in the client network are indeed unreachable from the main network, but the main network is reachable from the client network. So this is classic NAT, right? To work around this limitation, I had to add an entry to tell a compuer in the main network to route packets addressed to the client network addresses to the client router's address on the main network.

So even though a PC on the main network can't directly send to a PC on the client network, it can send to the client gateway which I added to its routing table I hope you understand routing tables, because that's what's used to implement all these high level policies.

So obviously, the main network PC never sees the mac address of PCs in the client network. And for the last time, there is no WDS - in fact, I changed nothing in the configuration of the DI when adding the wrt54g and its attached devices - that's part of the simplicity of this solution - no chance to mess up your existing configuration. Of course, this only works after I add the routing table entry: route add -net Feb 12, 1 0 0.

Thanks for all the good work user! I think you might be able to help me with this one. I have limited network experience so need your help with this. I have both of the ap and the bridge talking getting an ip from the dhcp. If not is there a way for the computers in the two subnets to see each other? Maybe throught the different subnets? If so would I also make the routes in the Firewall or in the router or both to connect the two differnet subnets?

This is so we can connect the computer from both sides of the network to see the windows domain and connect to it using windows xp pro.

Nutdotnet Diamond Member. Dec 5, 7, 3 My question is, and after reading this thread seems possible, but how exactly does one go about allowing PC1 and PC2 to speak to each other?

So, is it possible to FTP into the Xbox with this setup? Basically the Xbox is just like any PC connected to the client. And if so, how exactly would I configure it?

If you don't mind explaining, thanks! Oct 25, 29, Let first thank you ser You are the first one to put the effort to actually explain this process after hundred of posts that amount to one short phrase? Get a WRT54 and hack it. How ever can you explain to me the advantage of the usage of the WRT54? It worked and after that I put some security back on the main router and then I simply added the same security information on the dd-wrt flashed router.

I was having trouble getting it working when using the IP With this setup, I have full access to both routers — which runs contrary to a lot of the notes concerning Client Bridge mode. I can access both from either side of the bridge. There is no need to change any settings or IP addresses or the like with this setup in order to do so!

Note: if you want to be able to access the Client Bridge router externally, you need to set its gateway address to point to the address of the router that has external access If you don't have a matched pair of routers like I did, I would recommend changing step 3. For example, if your primary router was set to This way everything should be on the same subnet with unique IP addresses — and both routers should be accessible for configuration from anywhere on your network.

This is not the case anymore , but there may still be lots of reasons to go with this setup rather than WDS. While WDS allows both ends of the connection to accept wireless clients, there is less bandwidth to go around, and there could be more latency.

I was really amazed when I could reduce a file transfer in between a wired machine behind the WRT54GS and a wired machine behind the WAGG from about 55 minutes to 26 minutes more than twice as fast. The only difference was the absence of WDS and the updated firmware. Please note that there are technical limitations to wireless bridges, but that you can connect multiple clients to a bridged router and they will have both lan and wan access.

The average user will not likely notice any of these limitations. BrainSlayer Forum Answer [1] : "Client Bridge mode will only recognize one mac address on the bridged setup, due a limitation in the The problem is that the It may cause ARP table problems, if you connect more than one computer on the far end of a Client Bridge mode setup. You will not be able to, for example, block mac addresses of client of the bridged routers or set access restrictions based on mac addresses in the bridged router.

Although multiple devices on the client bridge wireless bridge appear to have the same MAC address in the arp tables of devices on the 'server' AP, something in the wireless bridge translates that MAC address on return traffic back to the correct one for a given device's IP address behind the bridge.

I suspect that there is enough of the routing function still turned on in the client bridge mode to maintain an arp table local to the client bridge and make the translations.

I would not want to count on multiple devices using non-IP protocols, and would be suspicious of things using special MAC addresses such as multicast addresses eg OSPF routers, multicast apps.

After a few seconds, the SSID broadcast disable network will show up as what you are connected to. The signal strength meter will also appear and light up. The following thread goes furhter more in detail concerning this discussion [2]. Only one single ethernet device is properly supported behind the router running in "client bridge" mode. It should have been baptized "client adapter mode" instead!

In the old forum we already had endless discussions about this subject. Note that this is a technical limitation of the To create a true transparent bridge, with multiple ethernet devices at both sides, use WDS. Here is my reason for my opinion:. Question: How does this work with one network card with multiple IP addresses?

Everything works and all devices in the local network subnet can talk to all devices in the network without using a gateway or default route. B Ping devices in your local subnet. Do not ping devices outside of your subnet. Also, ping devices behind your remote located DD-WRT "client bridge" mode radio and also ping the radios.

Now type in "arp -a". You may get an output like what I am showing below:. F Note that you have duplicate MAC addresses showing up in your "arp -a" output. Try this simple test while your network is active and passing traffic. Have all devices in your network perform a "ping -t a. Include the ping to your radio. If you have 10 devices in your network, open up 9 CMD screens on each computer and have each screen "ping -t" the other 9 devices.

While the "ping -t" is running, every device is forced to know the current MAC address and IP address of all other devices in your local network subnet. Test and see if things still work.

If you are running an advanced network which includes routing through the bridge, things go wrong pretty quick.

Routers on both sides of the bridge fail to route to each other. There are large delays in the network. UDP traffic starts get lost.

I just suggest that anybody using this bridge mode have a grasp on potential issues. If the remote network behind your remote DD-WRT "client bridge" radio is simple, you may not ever encounter a problem. Just select "Client Bridged". This will automatically turn off DHCP. See notes on a 2. I am also linking these in Client Bridged - updated for VFinal redhawk. Here's some extra information about client bridging and some, perhaps unexpected, side effects.

If you're a wireless networking wizard, you'll know this already. When you've switched to Client Bridge mode you won't be accessing the remote AP until your IP changes unless your box and the remote network are on the same subnet.



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