Problems with adding switch to router.

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Nytmare

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Jun 26, 2008
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The set up I have...

1. Asus RT-AC66R Router
2. Netgear Prosafe10/100 Switch FS116.
3. Motorola SURFboard cable modem SB6120.
4. IP: Charter cable.
5. Windows 7 64 bit all involved computers #1-3.

Local area network settings for computers #1-3 for IPv4 and IPv6 do have the settings:
"Obtain an IP/IPv6 address automatically" and "Obtain DNS server address automatically"

Cable modem ---> Router WAN port.

Router LAN #1 ---> computer #1.

Router LAN #2 ---> (via cat5 cable in wall) LAN #1 of Switch.

Switch LAN #x --->(via cat5 cable in wall)---> computer #2

Switch LAN #x --->(via cat5 cable in wall)---> computer #3

The problem...
1. With Router LAN #2 not connected to switch, computer #1 has connection to internet no problem. The wireless networking function of the router is also good (both 2.4 G and 5G).

2. Connecting Router LAN #2 to LAN#1 of switch, causes all three computers (#1-3) to loose internet connection (there is the yellow triangle with "!" in the bottom right taskbar network icon.

Disconnecting router LAN #2 cable (to switch) restores computer #1 connection.

I am hoping someone can point me in the right direction.

I am thinking there is an IP conflict with one/both of computers #2-3, but not sure where to go to next.

Help?





 
Solution
InvalidError

Your setup should work as-is but something is either not working properly, not configured properly or not wired properly.

Try router -> switch -> PC1

with nothing else connected using known-good 7-10' patch cables (ex.: tested using the router and PC1) between the router, switch and PC to eliminate in-wall wiring as a variable. If it works with everything in the same room connected with short cables, your problem could very well be your in-wall wiring.
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InvalidError

InvalidError

Titan
Moderator
May 18, 2007
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If there was an IP conflict, Windows/Linux/whatever would complain about it and since you have the IP configuration set to automatic/DHCP, that should not happen unless you have multiple devices on your LAN attempting to play DHCP server instead of only your router.

Since even PC#1 connected to the router gets taken out, my guess would be you might have some form of broadcast storm going on... either the switch is defective or two of its ports are connected to each other.
 
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N

Nytmare

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Jun 26, 2008
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My house is kinda of big. Connecting computers #2 and #3 to LAN port of router not possible, they are in different rooms/floors of the house. (There is also my Blue Ray, PS4, ect).

Floor #2
Computer #1, modem, router.

Floor#1 Switch.

Floor #2 and #3.
Computers #2 and 3.

The walls have cat5 cables to all rooms.

Need to find solution where I can use the wall cat5 ports and switch.
 
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InvalidError

InvalidError

Titan
Moderator
May 18, 2007
23,815
5,265
108,890

Your setup should work as-is but something is either not working properly, not configured properly or not wired properly.

Try router -> switch -> PC1

with nothing else connected using known-good 7-10' patch cables (ex.: tested using the router and PC1) between the router, switch and PC to eliminate in-wall wiring as a variable. If it works with everything in the same room connected with short cables, your problem could very well be your in-wall wiring.
 
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Solution
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bill001g

Titan
Aug 9, 2012
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Assuming you have a fairly average size house you should be able to test the cables by removing the switch and directly patching between jacks in your closet. You of course can only do a single pc at a time but it would help to isolate the problem. You would in effect plug pc 2 and pc 3 into port 2 of your router directly one at a time...just on a long cable that takes a strange path.

What you are trying to do is a very common method to get wired networks in more modern houses. It normally works with no problems at all doing it exactly as you describe.
 
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