2 Network Cards - One for network/One for 'net

[Murali]

I have two network cards installed in my computer... One is plugged into the Georgia Tech network for internet (The onboard gigabit controller), and the other one is plugged into my router-now-hub (standard/generic 10/100 card) for backing up to my file server... The kicker is in the fact that if I restart the machine with both cards enabled, my internet stops to work, and AIM won't connect... If I disable the generic 10/100, then I can connect to AIM and surf the net, but if I re-enable it after that, the internet stops working...

Help?

:help: :bonk:

[sodface]

How are the two cards setup? Is the onboard gigabit DHCP and the 10/100's IP is set manually? Have you ever had it working or did it just stop working recently? What OS are you running?

Instead of disabling the 10/100, have you tried disconnecting the cable from it and then booting - after you are up, re-connect the cable and does everything work correctly?

Try booting normally and running a "route print" command (if you are running windows) this computer with one interface looks like this:

C:\Documents and Settings\localadmin>route print
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 0b db d0 4b 58 ...... Intel(R) PRO/1000 MT Network Connection - Packet
Scheduler Miniport
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 172.17.200.1 172.17.200.235 30
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
172.17.200.0 255.255.254.0 172.17.200.235 172.17.200.235 10
172.17.200.235 255.255.255.255 127.0.0.1 127.0.0.1 10
172.17.255.255 255.255.255.255 172.17.200.235 172.17.200.235 10
224.0.0.0 240.0.0.0 172.17.200.235 172.17.200.235 10
255.255.255.255 255.255.255.255 172.17.200.235 172.17.200.235 1
Default Gateway: 172.17.200.1
===========================================================================
Persistent Routes:
None

The internet default gateway IP should be pointing to the IP address of the gigabit interface for your internet to work correctly.

I've messed around with this recently and tried it on both windows and solaris boxes - I think there was different results with each OS and I can't really remember how each one worked.

Give us some more info and we can get it sorted out - I'll try and get my thoughts sorted out in the meantime :p unless someone that really knows what they are talking about can post a solution...

I have a feeling it's something to do with IP address assignments (they shouldn't both be in the same range) and the order in which windows detects the interfaces.

[Murali]

Both are DHCP, the range of the IPs are different.
Gigabit IP - 128.61...
10/100 IP - 169....

Everything was working perfectly fine until I rebooted one day, and now its doing this.

Unplugging the physical cable I'm relatively sure would do it too... I wonder if setting the IP without DNS settings would make it work.

[Hawk]

I would assume that there are 2 cards. One nic on the MB and the other is an add on. Make sure that the one connected to the network w/ LAN is the first card to bind, that will ensure that the DNS is handled correctly.



BTW, :welcome: to the BE :wave:

[Shayd]

If your second card is getting a 169 address range that is the default "Can't find a DHCP server" IP (called private address range I believe.)

Might check to see if you actually can get to a dhcp server on the second card by switching cables real quick. You can do a ipconfig/renew to update/get a new assigned IP.

Let us know what happens with that.

Scott

[Murali]

Sorry... the real configuration is like this:

Gigabit Network (Plugged into GaTech network): 128.61...
10/100 Network (Plugged into router-turned-hub): 192.168.0.2

If I enable the 10/100 network, my default gateway automatically changes to the default gateway to the router connected to the 10/100 card.

What can I do?

[Hawk]

You need to change the interface metric on the Nic you don't want routing to
the internet. Open the TCP properties on your internal NIC, go to the DNS
section, and change the interface metric (use manual metrics for both nics)
from 1 to 2.

:yup:

This is under the Advanced IP Settings

This basically tells the PC which NIC has priority for routing.

[Murali]

Thanks!