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Conflict between multiple routers


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MarkST3's Avatar
MarkST3 MarkST3 is offline
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11-Jul-2010, 06:25 AM #1
Question Conflict between multiple routers
Hi,

I've got a bit of an intermediate setup which probably isn't going to be long-term but I can't think of a logical reason why it shouldn't work so I'd like to solve it... after all, how do you learn about things if you don't give it a go :-)

I have combined DSL modem & wireless router providing internet access "wirelessly" to multiple PCs at home. I also have a wired router, connected to our main PC, also connected to a NAS HD which I use to back-up music and photos- this wired router has no other connection inc internet. (For info, the NAS HD used to be connected to the wireless router but the bandwidth wasn't high enough to support the large volume of data when I was backing up, particularly when our laptop was being used to go online).

So in summary- the subject PC is connected by wires to a NAS HD via a wired router, but accesses the internet via a wireless router/modem.

My problem is that there seems to be a conflict between the 2 arrangements- I'm a novice when it comes to setting up networks so I may well have missed something obvious! I have ensured the routers have different IPs (wireless 192.168.0.1 and wired 192.168.1.1) but other than that are left with basic/automatic settings. There was a short time when all seemed to be working in harmony, but shortly afterwards only one set of network connections will work at a time i.e. disable the wired network adapter and the wireless connection to the internet works fine; disable the wireless adapter and the wired connection to the NAS works fine.

I've plugged all known IPs into my software firewall, and even disabled the firewall and it has no effect.

I've seen in other places there are some system states that can help diagnose so I've included them below- from them I notice that:
1) 2 "tunnel adapter local area connections" seem to share the same physical address.
2) The IPv6 DUIDs for both network adapters are the same.

Could they be what's causing the problem here?

Cheers,

Mark

ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Mark
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Ralink RT61 Turbo Wireless LAN Card
Physical Address. . . . . . . . . : 00-0E-2E-D7-F9-12
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::d908:8d50:6649:1e5d%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.0.3(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 11 July 2010 01:14:44
Lease Expires . . . . . . . . . . : 14 July 2010 01:14:43
Default Gateway . . . . . . . . . : 192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DHCPv6 IAID . . . . . . . . . . . : 234884654
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-0F-AC-0D-11-00-1D-09-82-69-5D

DNS Servers . . . . . . . . . . . : 192.168.0.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) 82562V-2 10/100 Network Connection
Physical Address. . . . . . . . . : 00-1D-09-82-69-5D
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::ac0d:a0e2:ccfe:6a3%9(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.136(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 11 July 2010 00:39:08
Lease Expires . . . . . . . . . . : 18 July 2010 01:15:21
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 201334025
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-0F-AC-0D-11-00-1D-09-82-69-5D

DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 6:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 02-00-54-55-4E-01
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 10:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 11:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.{stuff!}
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes


route print

Interface List
10 ...00 0e 2e d7 f9 12 ...... Ralink RT61 Turbo Wireless LAN Card
9 ...00 1d 09 82 69 5d ...... Intel(R) 82562V-2 10/100 Network Connection
1 ........................... Software Loopback Interface 1
8 ...02 00 54 55 4e 01 ...... Teredo Tunneling Pseudo-Interface
25 ...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter
13 ...00 00 00 00 00 00 00 e0 isatap.{stuff!}
===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.136 20
0.0.0.0 0.0.0.0 192.168.0.1 192.168.0.3 25
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
192.168.0.0 255.255.255.0 On-link 192.168.0.3 281
192.168.0.3 255.255.255.255 On-link 192.168.0.3 281
192.168.0.255 255.255.255.255 On-link 192.168.0.3 281
192.168.1.0 255.255.255.0 On-link 192.168.1.136 276
192.168.1.136 255.255.255.255 On-link 192.168.1.136 276
192.168.1.255 255.255.255.255 On-link 192.168.1.136 276
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.1.136 276
224.0.0.0 240.0.0.0 On-link 192.168.0.3 281
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.1.136 276
255.255.255.255 255.255.255.255 On-link 192.168.0.3 281
===========================================================================
Persistent Routes:
None

IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
1 306 ::1/128 On-link
9 276 fe80::/64 On-link
10 281 fe80::/64 On-link
9 276 fe80::ac0d:a0e2:ccfe:6a3/128
On-link
10 281 fe80::d908:8d50:6649:1e5d/128
On-link
1 306 ff00::/8 On-link
9 276 ff00::/8 On-link
10 281 ff00::/8 On-link
===========================================================================
Persistent Routes:
None
JohnWill's Avatar
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11-Jul-2010, 09:05 AM #2
Why not simply one router and an Ethernet switch in front of it for all the connections? Having another router in the mix is sure to screw things up.

What are you trying to accomplish with the secondary router?
TerryNet's Avatar
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11-Jul-2010, 12:52 PM #3
When Windows has a choice of Default gateways to use (needed for internet access) it chooses wired over wireless. So, with your current setup you need to set a static IP on the ethernet connection, mask 255.255.255.0, and leave the Default Gateway and DNS server blank.
MarkST3's Avatar
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11-Jul-2010, 05:35 PM #4
JohnWill- as I said it's an interim setup. The wireless wasn't quick enough to support my bulk data backups, and I had a spare wired router lying around. I was also guessing a basic ethernet switch might solve it.

TerryNet- cheers for the suggestion but unless I misunderstood exactly what you meant, it doesn't seem to work. I defined an arbitrary static IP for the router (192.168.100.100), applied the mask as you say and left the other fields as blank as I could (they defaulted to 0.0.0.0). No change.

I'm not in a position to modify the wiring in my house right now so I'll probably get some of those network adapters that transmit over mains wiring.

If anyone has any other brain-waves I can try in the meantime, just let me know! :-)

Cheers,

Mark
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11-Jul-2010, 05:57 PM #5
You need not change the router's IP; just your PC's ethernet connection. With the router as it was before just assign your ethernet IP 192.168.1.x, where x is between 2 and 254 but not in the Dhcp server's address range.
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11-Jul-2010, 06:24 PM #6
If you just want to make that router into a switch, we have the recipe for that.


Connecting two (or more) SOHO broadband routers together.

Note: The "primary" router can be an actual router, a software gateway like Microsoft Internet Connection Sharing, or a server connection that has the capability to supply more than one IP address using DHCP server capability. No changes are made to the primary "router" configuration.

Configure the IP address of the secondary router(s) to be in the same subnet as the primary router, but out of the range of the DHCP server in the primary router. For instance DHCP server addresses 192.168.0.2 through 192.168.0.100, I'd assign the secondary router 192.168.0.254 as it's IP address, 192.168.0.253 for another router, etc.

Note: Do this first, as you will have to reboot the computer to connect to the router again for the remaining changes.

Disable the DHCP server in the secondary router.

Setup the wireless section just the way you would if it was the primary router, channels, encryption, etc. Note that you should use the same SSID and encryption key for the secondary router but a non-conflicting channel. I recommend channels 1, 6, or 11 for use for the best results.

Connect from the primary router's LAN port to one of the LAN ports on the secondary router. If there is no uplink port and neither of the routers have auto-sensing ports, use a cross-over cable. Leave the WAN port unconnected!

This procedure bypasses the routing function (NAT layer) and configures the router as a switch (or wireless access point for wireless routers).

For reference, here's a link to a Typical example config using a Netgear router
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MarkST3's Avatar
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13-Jul-2010, 05:15 PM #7
Terry, John, cheers guys- I'll give that a go soon and post up what happens!
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