Help with forwarding a port.

Forums › LAN (ethernet/Wifi/routers/Bluetooth) › Help with forwarding a port.

peacemaker898

3 posts

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#19961 8-Mar-2008 05:08

Yes, I tried following the instructions on portforward.com but to no avail. What I was wondering was if I had to repeat the process on every one of the computers on the network (There are 4, 5 including a laptop) in order to get the static IP, I only did it on one of them.

I'm running on a Motorola SB5101 modem and a Netgear WGR614 v6 router.

Any help would be greatly appreciated.

By the way, I want do do this for uTorrent, which goes painfully slow for me.

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freitasm

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#115356 8-Mar-2008 08:36

You only need a static IP address on the PC you want the port forwarded to.

However you will need to prevent conflicts. If you enter a static IP on a computer you have to make sure the router won't give that address to any other PC in the LAN. You do this by correctly configuring th DHCP service in the router. You can make it use a pool of addresses and make sure your PC is using an address that falls outside the range the DHCP server is using.

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peacemaker898

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#115362 8-Mar-2008 10:11

Okay, how can i find what range my DHCP is using, or any of that for that matter. (If you couldn't tell, I am a complete noob with networking!)

xpd

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#116594 14-Mar-2008 11:03

Somewhere in your router should be a LAN settings area - usually this holds relevant information to your LAN, such as DHCP pool, router IP address etc etc.

A quick way to get a rough idea of what IP range your DHCP is offering, is goto Start->Run->cmd
type ipconfig /all
Where it shows IP address, thats your current IP and in theory your router is offering out the range from x.x.x.1 to x.x.x.254

example :

After entering ipconfig /all I get this (well, there is more but not relevant).

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : domain.local
Description . . . . . . . . . . . : Atheros L2 Fast Ethernet 10/100 Base-T Controller
Physical Address. . . . . . . . . : 00-1B-FC-BA-72-05
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.118
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.254
DHCP Server . . . . . . . . . . . : 192.168.1.4
DNS Servers . . . . . . . . . . . : 192.168.1.11
192.168.1.4
Lease Obtained. . . . . . . . . . : Friday, 14 March 2008 10:13:55 a.m.
Lease Expires . . . . . . . . . . : Saturday, 22 March 2008 10:13:55 a.m

If this wasnt my network and I wanted to see what range the router is potentially offering, looking at the Ip Address tells me that I'm on the 192.168.1.x range so could be given anything (tats not in use obviously) from .1 to .254.

So lets assume your router is giving out IPs in the 192.168.1.x range...

Go to your workstation network settings, Properties of the LAN connection, TCP/IP settings.
Specify an IP address (lets say 192.168.1.10), subnet of 255.255.255.0, gateway of 192.168.1.254 (this is your routers IP), DNS can either be your router, or your actual ISP DNS.

OK your way out of that.

Now your workstation should be on a static IP (only for LAN, not the internet).

Now goto your router and find the virtual server/port forwarding section. Most routers ask for a port number and destination IP - so in the example it would be <port number> (whatever you want for Utorrent, personally I use 1512 which is also specified in Utorrent settings) and 192.168.1.10.

Apply/save, reboot router and fingers crossed you should be away :)

Hope thats of help and hasnt confused you :)

PS: If youre not confident when making these sorts of changes, I find it helpful to write down/screenshot the original settings so i can put them back if everything goes to hell.

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webwat

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#118098 22-Mar-2008 20:23

Why do you have a modem AND a router? Does the router not have a built-in modem or does your other router do wireless or something? It sounds like you have 2 NAT routers there, each designed to block incoming traffic that wasnt setup with port forwarding. If you have 2 ranges of IP addresses but only 1 NAT router (a modem with a "WAN" port) you might want to simplify your network a bit by merging the network subnets, eg let the NAT router allocate IP address to the wifi router and everything else). If you have 2 NAT routers (both with "WAN" ports) then either turn off the NAT on the internal wifi router or forward traffic from the modem to the wifi router and setup forwarding on the wifi thing as well.

Time to find a new industry!

freitasm

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#118124 22-Mar-2008 21:54

The Motorola SB5101 Surfboard is for cable modem - they don't do NAT or routing. They are just a modem. They rely on your PC's or router's configuration, so there's no double NAT happening there.

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peacemaker898

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#118146 23-Mar-2008 07:38

I decided to let it go seeing as how I can't understand most of the network terms used. :P

And I have a modem and a router for the wireless and added ethernet ports, I don't know what you mean about the reast.

Thanks for trying to help anyways.