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egeller624
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PostPosted: Tue Apr 12, 2005 8:17 pm    Post subject: RT31P2 port forwarding Reply with quote Back to top

I've searched on this issue but haven't found a clear solution. I need to forward specific ports on my RT31P2 to my BEFW11S4, but the problem is, the RT31P2 only let's me specify an IP of 192.168.15.x and my wireless router is 192.168.1.1

Any suggestions?

In case this is unclear, I am trying to open up specific ports. I have the port forwarding setup on my wireless router and it points to my internal static IP. But that doesn't really help me since the RT31P2 is outside of all that. I need to forward the ports to my wireless router IP, or is that not correct?

Thanks in advance.

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ahamel
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PostPosted: Tue Apr 12, 2005 9:44 pm    Post subject: Reply with quote Back to top

Assign your wireless router an IP address in the range of the RT31P2. Something like 192.168.15.102
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aboat2
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PostPosted: Wed Apr 13, 2005 1:56 am    Post subject: Reply with quote Back to top

I wouldn't pick that .102 address (unless you've disabled the DHCP server in the RT31P2 as its default range is 100 to 149). Warning, this is wordy, but perhaps will help you understand a little about the way traffic flows (in a simplistic frame of mind)

I assume you have "internet" -> RT31P2 -> BEFW11S4 -> local printers and desktops, etc. Think of each router as having two sides, and to match the above diagram, think of the left side as the WAN or internet side and the right side as the LAN or Local Area Network side. So, the left side of the RT31P2 typically gets its address via DHCP from your service provider (or they've assigned you a static ip as part of the setup). "inside" of the RP31P2 it has multiple pathways and "doors" onto its right side LAN, and it controls those via the subnet mask. Typically 255.255.255.0 which basically says to look at the last .x part of the address and map that to a LAN cable plug (or doorway if think that way) as the other bits in the dotted address have to match (its a mask and 255 is binary 11111111 so all bits must match). So, on the basic setup page of the RT31P2, you'll see in the top half the "internet connection" part that corresponds to the "left" half or WAN part of the router. That will be assigned from your ISP to work with the ISP routers that are further infront of your router. Down a bit on the page is your local LAN setup. By default, 192.168.15.1 with a subnet mask of 255.255.255.0 which says that anything (host) plugged into the LAN ports of the RT31P2 must have an address of 192.168.15.xxx (a few of the xxx's are reserved ... 0, 255, as well as the way to address the router from the LAN side ... in the default configuration case its as host 15. Then just a bit further down is the DHCP range defaulting to 50 hosts starting at 100. Those 50 addresses are given out as hosts attached to the LAN ports request one. All the other 200 or so addresses are available for you to pick a static never changing value. You want a static never changing address assigned to your BEFW11S4 so you can tell the RT31P2 what address (doorway) to forward those ports to.

So on your BEFW11S4 router admin page, you should see something similiar on the addressing setup. Pick an address that is not in the DHCP range of the RT31P2 but is in the subnet (remember that 255.255.255.0 .... 255 is hex FF which is all 8 bits are significant). For example, assign your BEFW11S4 an address such as 192.168.15.2 or something else not in the DHCP range. Now that the BEFW11S4 has an address that never changes, you can go to the RT31P2 and forward ports to that specific host address.

Also, on your BEFW11S4, it probably has a DHCP server as well. You should assign its addresses in a different subnet ... for example 192.168.1.xxx and its range of DHCP addresses can be another block of 25 or 50 or what ever. It looks like that is what you have already from your description of your wireless router address of 192.168.1.1

The routers have a NAT (Network Address Translation) algorithm that maps LAN addresses to traffic it sends out on its WAN port. For example, plug a computer into your BFW11S4 and it asks BEFW11S4 for an address and might get 192.168.1.100. Perhaps you have an IP printer attached at a static IP address of 192.168.1.21. If you send some TCP/IP traffic from your box to anything with an address of 192.168.1.xxx your BFW11S4 will look up to see which LAN port has that device and send it merrily down that wire. If you try to connect to 192.168.15.1, the BFW11S4 sees that the subnet (192.168.15.xxx) is different from its subnet (192.168.1.xxx) so it sends the traffic out its WAN port which is connected to the RT31P2. The RP31P2 applies the subnet mask and sees that results is its subnet so looks to see which local device it should send the traffic to and in this case of .1, it sends it to its own mini web server built into the device.

So lets say your PC was requesting traffic to go to ip address 66.94.234.13. The BFW11S4 sees that it isn't on its subnet so it forwards it out its WAN port. The RT31P2 sees it isn't on its subnet so it goes out its WAN port, your ISP routers do the same thing. For inbound traffic think in reverse. For example, traffic coming into your setup for port 80 destined for 192.168.1.101 will hit the RT31P2 which says 192.168.1.xxx isn't on its subnet so will forward that to the host you've specfied in the port forwarding pages... in this case the address of your BEFW11S4 (192.168.15.2 for example). Now the BEFW11S4 applies the subnet mask and sees that it is on its subnet so it knows which host to send the port traffic to.

I tried to simplify this and it still is pretty wordy, but perhaps it helps understand the underlying concepts and thus you can understand how you want to configure things in your network. The simple answer is assign your BEFW11S4 a static IP address that is in the subnet of the RT31P2 and that also doesn't conflict with the RT31P2 range of addresses it dynamically assigns via DHCP.
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egeller624
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Joined: Jan 25, 2005
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PostPosted: Wed Apr 13, 2005 12:08 pm    Post subject: Reply with quote Back to top

Well that makes sense. Thanks for the advice. Turns out it might be unnecessary though. Last night I tried taking the routers out of the equation and just connected my PC directly to the cable modem... and I still had the same issue trying to reach a specific server on a specific port. So, either it's my ISP blocking it (doubtful) or the server is having issues (quite possible).

But at least I know what to do if and when I need to setup port forwarding in the future. Thanks again.

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aboat2
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PostPosted: Wed Apr 13, 2005 12:52 pm    Post subject: Reply with quote Back to top

My observation is that the home versions of routers are more like 1 way mirrows than 100% true firewalls. They'll let just about any port go out from the LAN side to the WAN side, but will block the reverse situation. So, if the application can be initiated on your LAN side and the server responds using the already established connection path from your LAN, then you are fine. i.e. like web page traffic ... Your PC requests out through port 80 to the server which replies back on that same existing connection path. Now on the other hand if the web server tried to initiate a new connection to your PC on port 80, typically the home router will block that request. (If not, many ISP's will also block that incoming port so you can't host a web server on the standard port yourself) Think of port blocking like a phone with a broken ringer.... you can dial out and make calls but if somebody calls you the phone doesn't ring so you don't know to answer. But on the other hand, once you've made the connection, it can last virtually forever or until one of the parties hangs up (not implying anything in particular about Vonage, just another analogy). So perhaps if there is a game server that needs to establish its own communication channel back to your PC, it will get blocked as it is initiating the connection.
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