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Vonage I wouldn't pick that .102 address (unless you've disabled the DHCP server in the
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.
Read The Full Thread: RT31P2 port forwarding
• I've searched on this issue but haven't found a clear solution. I need to forward
• Assign your wireless router an IP address in the range of the RT31P2. Something
• Well that makes sense. Thanks for the advice. Turns out it might be unnecessary
• My observation is that the home versions of routers are more like 1 way mirrows
aboat2 posted "I wouldn't pick that .102 address (unless you've disabled the DHCP server in the" on 04/13/2005 |
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