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how-to connect linksys wrt54g v5 router and a webstar dpc2100 cable modem

I am connected to internet using a cable modem webstar dpc2100 and it's working well in only one computer. I want to share this connection with other computers using wired and/or wireless NIC's. The IP of the cable modem is 192.168.100.1 when it is not connected to coaxial cable, and when it's connected its IP is 72.196.200.202. The default IP for the router is 192.168.1.1. Please help me.
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jbc_geo
Asked:
jbc_geo
1 Solution
 
Viper2299Commented:
Connect the cable modem to the "internet" port on the linksys router.  The router has it's own version of DHCP, so when  you connect more computers to the router (wired or wireless)  they will automatically be assigned a 192.168.xxx.xxx ip address and will work on the network.
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dmcoopCommented:
FIRST OF ALL DO NOT USE THE INSTALL DISK THAT COMES WITH THE LINKSYS.

1)  Connect the coax to the cable modem.

2) Connect the cable modem to the Linksys.  This should be a network patch cable.  Connect it to the "WAN" or "Internet" port on the Linksys.

3) Unplug the power from the cable modem and the Linksys and shutdown your PC.

4) Plug the power back into the cable modem first.  Let it boot all the way up (give it a minute or two).

5) Plug the Linksys up to power next.  Let it boot too (takes about 45 seconds).

6) Turn on your PC.  Once the PC is up you should be able to surg the net.  But you are not done . . . . read on.

Now you need to secure your Linksys WRT54G.

7) Open Internet Explorer.  Browse to http://192.168.1.1 and login.  Leave the username blank and the password is admin

8) Go to the administration setting and change the password to something secure.  Apply it and then log back in.

9) Go to the wireless section and change the channel for 6 (default) to something else.  Don't worry about this one if you don't have any neighbors near you.  The reason for the change is they all come out of the box on channel 6.  If you are near another one on the same channel it can cause problems and since most people do not change their routers basic settings . . . well you get the picture.

10) Change the SSID to something besides linksys.  This is so you can see yours easily from your neighbors.  I don't recommend using a name that can be tied back to you.  Make it something generic like "private" or "wireless".

Now you need to decide if you want to secure your wireless network to keep people from skimming the internet off of you.  Again if you live out in the boon docks then this won't matter.  I'll leave this part to you to figure out . . . or if you want you can post another question.

You'll like the Linksys product.  We have about 20 of them in our organization at construction offices and have zero problems out of them.

Good luck.
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dmcoopCommented:
I stated above: "Once the PC is up you should be able to surg the net"  I meant surf  . . .oops.

I also meant to tell you when I change the change from the default of 6 I usually go down to 1 or 2.  Just a habit based on some small matter of physics about high frequency signal loss.  The lower the frequency the longer it will carry.  Their probably isn't enough difference to matter . . . but it makes me feel good.  :-)
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logic0004Commented:
Here is the link to do all kinds of set-up of ur router with picture details as well

http://www.linksysinfo.org/modules.php?name=Content&pa=showpage&pid=12

check it out...
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jbc_geoAuthor Commented:
Thank you all, but it didn't work. What I really need is the configuration of both the router and the cable modem.
The modem is a Scientific-Atlantic Webstar DPC2100
Use this link to see the which modem exactly I have.

http://www.sciatl.com/products/consumers/userguidepdfs/webstar_userguides/DPC2100A.pdf

The router is a Linksys WRT54G v5
Use this link to see which router exactly I have:

http://www.linksys.com/servlet/Satellite?c=L_Product_C2&childpagename=US%2FLayout&cid=1115416825557&pagename=Linksys%2FCommon%2FVisitorWrapper

Please if someone know how-to connect this devices to share a cable internet connection, let it me know. Thank you

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dmcoopCommented:
Who is the cable company?

I have remote offices in 4 different cables companies.  The directions I outlined above work with all of them.  

Follow the directions I have outlined and stop at step six.  Now log into the Linksys and click on the Status link (at the top menu all the way to the right).  I need the following:

Domain Name:

Login Type:

IP Address: Don't give me the real one - just let me know the first three section.  ie  172.18.52.xxx

Subnet Mask:

Default Gateway:

DNS 1:

Now back on the Setup tab under Basic Setup.  The very top option is a drop down menu.  What is it set to?  It should be "Automatic Configuration - DHCP"

Also, don't try to get any wireless devices working UNTIL you have a PC that is connected to the Linksys working.

Lastly, and I guess this should have been first.  If you cannot log into the router then something needs to be changed on the PC.  Post back if that is the case and I'll give you some troubleshooting directions.  

Good luck.
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jbc_geoAuthor Commented:
Thank you "dmcopp"

My cable provider is COX

IP Routing enabled ......... No

IP Address: 72.196.220.xxx
Subnet 255.255.252.0
Default gateway 72.196.220.1
DHCP server: 179.19.105.13
DNS1 : 68.100.16.30

In router's Setup window the first option is set to "Automatic Configuration - DHCP"

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dmcoopCommented:
You said: "IP Routing Enabled . . . . No"  . . . . Where did you pull this information from?  What screen?  It is just a setting I didn't expect to see.

Default gateway 72.196.220.1 resolves to [ ip72-196-220-1.dc.dc.cox.net ] . . . so your router is picking up information from the cable modem.  That is good.

DNS1 : 68.100.16.30 points to [ ns1.dc.cox.net ] . . . which is a Cox name server.  This is also good.

Now I have to assume that since you can login to the Linksys that the Linksys is handing you an IP and the network between your PC and the Linksys is good.  I also am assuming that since you are getting Cox network information onto the Linksys that the network between the Linksys and the cable modem is good.

Based on everything you have told me it should be working.

There is something else to try.  Before you go through all of these steps I am outlining below.  Trying resetting the Linksys back to factory defaults and then follow the steps I outlined in my earlier post.  I did have one of these routers out of the box misbehaving and a factory default setting reset fixed it.  To do this log into the Linksys.  Click on the administration menu and then on the Factory Defaults sub menu then select Yes for Restore Factory Defaults and then click on Save Settings.  You'll have to reset your password because it'll be back to the "admin" one.  

If resetting the router to factory default settings and starting over with step one with my directions in the above post still did not yield a working situation I want you to do the following:

1) Open a command prompt.  This can be done by clicking on Start and then run.  Type "cmd" in the run dialog box and hit enter.  A block DOS window will open.  Don't worry about what is in front of the ">" . . . just so long as you have a flashing cursor.

2) Type in the following at the prompt and then hit enter: tracert www.yahoo.com
The very first hop should be 192.168.1.1 (your Linksys).  It may time out on the second hop or it may show the IP address of the cable modem.  The third hop will show Cox cable information.  I'm not worried about the rest.  Just post back here verbatim what those first 3 hops are.

3) While still at the DOS prompt type the following and hit enter: ping www.yahoo.com
Post back what you get.  You should get four replies.  

4) Again do the ping thing but this time enter: ping 4.2.2.2
Again you should get four replies.  Let me know what happens.

5) Lastly while still at the DOS prompt type in the following and hit enter: pathping 4.2.2.2
The first hop is labeled as a zero and it will be your PC, the second is labeled one and is the Linksys, the third one will be your cable modem and so on.  Please post back the first 5 hops.  The pathping command can take some time to run so don't think your PC has locked up.  Wait it out.

Good luck.




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jbc_geoAuthor Commented:
Thank you again "dmcoop"

The addresses i wrote above are what i got after executing the  IPCONFIG /ALL command in Command Prompt. At that time only the cable modem was connected to one computer using a UTP cat5 wire. Now the deal is that I want to share this internet connection using a Linksys WRT54G router, and what I did up to now didn't work. That's why I need help to configure the modem and the router to share this connection.
Thank for your help.
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dmcoopCommented:
"That's why I need help to configure the modem and the router to share this connection."

I left a step out above and that may have caused us to get hung . . . oops.  Here are my first six steps with an additional one I forgot.  Try these and then let me know what happens.

1)  Connect the coax to the cable modem.

2a) Connect the cable modem to the Linksys.  This should be a network patch cable (that UTP Cat5 you have).  Connect it to the "WAN" or "Internet" port on the Linksys.

2b) Connect the Linksys to your PC.  Plug a network patch cable in any of the four ports on the back of the Linksys and then into your NIC on the PC. (THIS IS THE STEP I FORGOT).

3) Unplug the power from the cable modem and the Linksys and shutdown your PC.

4) Plug the power back into the cable modem first.  Let it boot all the way up (give it a minute or two).

5) Plug the Linksys up to power next.  Let it boot too (takes about 45 seconds).

6) Turn on your PC.  Once the PC is up you should be able to surf the net.

Now if you have followed this directions and still cannot surf the net leave everything hooked up the way it is and do an ipconfig /all . . . it should show that you have an IP address of 192.168.1.100 (or whatever the Linksys is handing out) and a gateway of 192.168.1.1.

If you are not getting an IP from the Linksys then try at a DOS prompt IPCONFIG / release and wait till it completes then do a IPCONFIG /renew and wait for it to complete.  Then do an IPCONFIG /all and see if you the Linksys has handed you an IP address and gateway.  

If you still fail to get an IP address from the Linksys make sure you have a link-light on on the port you plugged the PC into on the Linksys.  If you have a link-light and still are not getting the Linksys to give you an IP then try doing a factory reset on the Linksys.  This is accomplished by unplugging it's power from the back and then pressing in the reset switch for 15 seconds, do not release the reset switch and plug the power back in, then release the reset switch.  Then start at the top again by powering everything down and turning it back on one piece at a time.

Now assuming you have got an IP address fomr the Linksys, open Internet Explorer.  Browse to http://192.168.1.1 (or whatever the gateway is after you do an IPCONFIG /all)and login.  Leave the username blank and the password is: admin

I want you to follow the directions I posted second . . . here they are again:

Click on the Status link (at the top menu all the way to the right).  I need the following:

Domain Name:

Login Type:

IP Address: Don't give me the real one - just let me know the first three section.  ie  172.18.52.xxx

Subnet Mask:

Default Gateway:

DNS 1:

Now back on the Setup tab under Basic Setup.  The very top option is a drop down menu.  What is it set to?  It should be "Automatic Configuration - DHCP"

All of this information is in the Linksys.  I'm not wanting to know what IPCONFIG /all reveals . . . maybe later or if you are not attaching to the Linksys.

Post the information back and we'll see what needs to happen next.
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