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Trouble Connecting a Router to a Router

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Last Modified: 2012-05-10
To get an extra port to the cable modem, I tried hooking up an unused DSL Modem/Router, but this caused one PC to lose internet connection.

The ORIGINAL LAN diagram (Figure 1) shows our working home configuration. The Trendnet router had 4 ports, all being used. We had a PS3 unit which we would swap in and out with another PC.

Then I found an unused DSL Router Modem - a Westell VersaLink Model 327W
           (actually, Model: D90-327W15-06 Rev.D)

I removed the telephone cord, and plugged it in (possibly using wrong ports and/or cables) as shown in Figure 2. All seemed to work for a few hours awhile with some intermittent problems.

Then the Windows 7 PC (on SWITCH1) reported that there was no internet connection. WV1 (Windows Vista), XP1, XP2 were all connected OK).

I removed the power from the Westell unit, and the Windows 7 PC regained connection almost immediately.

I was surprised that only the Windows 7 PC lost connection. Can the Westell DSL Router Modem be used essentially as a switch to give us the extra port that we need? Any idea why just one PC was affected by the configuration in Figure 2?

I can get a switch, but would think that I should be able to hook up the DSL unit to give us the extra port. All the cables in my home are of the same type.

=====================================

Here is a manual I found online for the Westell unit.
    http://westell.com/content/products/pdf/030_300444A.pdf

From the manual, it appears that the IP address is (192.168.1.1)
=====================================

Figure 1: ORIGINAL LAN
_____________
 Cable Modem
_____________
   ^
   |
Router-Gateway (192.168.0.1) Trendnet TWG-BRF114
  ^                     ^        ^       ^
  |                      |         |        |
-SWITCH1-     WV1    XP1    XP2
^     ^    ^    
|      |     |
XB  W7 XP3

All the cables I have are the same.

=====================================

Figure 2: ATTEMPTED TO ADD PS3 WITH ROUTER
_____________
 Cable Modem
_____________
   ^
   |
Router-Gateway (192.168.0.1)
  ^                    ^       ^          ^
  |                     |        |           |
-SWITCH1-    WV1   XP1    DSL_Router_Modem (DSL not used)
^      ^    ^                            ^        ^
 |      |     |                             |         |
XB  W7  XP3                        XP2     PS3

================================

Thanks for your assistance.

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JohnBusiness Consultant (Owner)
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JohnBusiness Consultant (Owner)
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Commented:
I think that is pretty much what I wrote above.   ... Thinkpads_User
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Commented:
>> an IP outside the DHCP range of the Trendnet
How do I determine the DHCP range  of the Trendnet?

>> Use a patch cable
The cables I have now connect a PC to the Trendnet router, or PC to a switch. This same cable is being used to connect SWITCH1 to the Trendnet router. For the two routers that I have, do I have to get a different cable?
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Commented:
Thanks for the replies.

BTW - I was wondering why it sort of worked for most of the PCs, but in the end (not initially), just the Windows 7 PC lost its internet connection.
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JohnBusiness Consultant (Owner)
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Commented:
Hey, thanks for all your input. I'll be attending to this but yesterday I got an unknown RAID 0 error. I'm working this now.
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Commented:
Thanks all for your guidance. No problems for a day. Much obliged.

http:#34125887 & http:#34125889 (2 minutes apart): explains to disable DHCP in the router that is to be converted to a switch; and change IP address of this router to be xxx.xxx.0.y, where y is outside the range of the Gateway Router (Trendnet).

http:#34125889 identifies the cable to use between the two routers

http:#34127076 explains why disabling DHCP is necessary to prevent conflicts

http:#34127103 clarifies how to determine the DHCP range  of the Trendnet and clarifies the types of cable to use
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Thank you. I was pleased to assist.  .... Thinkpads_User
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