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I've been having weird issues with setting up a routing table. Our company network recently changed, and chat programs are now blocked. My goal is to have certain IP addresses go out of 1 NIC (external), but everything else go through the internal NIC.

My main issues is that when I plug in the external NIC, I can no longer access internal sites, even if I have them routed. For example, I've done a tracert to our company internal main page. The data is:

IF 11 = Internal
IF 17 = External

internal IPs = 192.168.*.* and 10.*.*.*
internal gateway = 192.168.1.2

route add 192.168.0.0 mask 255.255.0.0 192.168.1.2 IF 11
route add 10.0.0.0 mask 255.0.0.0 192.168.1.2 IF 11

The internal NIC has a metric of 1, while the External metric is higher.

However, as soon as I plug in the external, even with these routes, I cannot access the internal network anymore.

This seems pretty straightforward, can anyone see some obvious flaws?

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    Exactly what kind of "External NIC" is in question? Also, your gateware need to be on the same subnet. So you can't use 192.168.1.2 as a gateway out of 10.0.0.0.
    – Ƭᴇcʜιᴇ007
    Commented Sep 1, 2016 at 15:08
  • The External NIC is an iphone as a hotspot. My internal IP is 192.168.2.*, with a gateway of 192.168.1.2, and some our servers we connect to are 10.*.*.*.
    – ChromeBlue
    Commented Sep 1, 2016 at 15:23
  • Can you post your actual routing table when things stop working?
    – Mark Riddell
    Commented Sep 1, 2016 at 21:36

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