Default gateway setting lost according to ipconfig but shows through control panel.

Posted on 2007-08-03
Last Modified: 2012-06-27
Running windows 2003 standard 32bit, SP1.  Broadcom 1GBit.  Machine has two NICs installed, one for the frontnet and one for the backnet.  FrontNet has 2 public IPs and a public default gateway.  For no known reason or cause the machine will stop responding on the public IP NIC when pinged from an outside address.  When pinged from a machien on the same subnet there is a response and all is good.  A closer look at ipconfig shows that there is no default gw assigned to the nic, but when I go into Control Panel and check there the default gateway is set.   If I do a repair on the NIC via CP and then do another IPConfig the gateway is listed properly and the world is again a perfect place.  There were no windows update, no changes to that machine between the time it was working and then not working.  The machien allows HTTPS/HTTP traffic only via an SPI FW at the perimeter.  Any ideas what causes and what the permanent fix may be?  Thank you.
Question by:BladesAway
    LVL 29

    Accepted Solution

            Hi BladesAway
                    A computer can not have more than 1 default gateway. So what you have to do is removing the gateway for inside NIC permenantly, leave it blank (If there is no inside router/vlan, otherwise you have to route add) and let only the OUTSIDE interface has a default gateway.


    Author Comment

    Each NIC can have its own gateway in a multi-homed environment which this is, and other nodes in the environment are functioning fine and have never experienced this issue in the two+ years that they have been running.   In this particular situation the gateway setting is not shown when doing a an IPconfig yet it shows through control panel.  This suggest to me that there is something else going on.  Any more thoughts?

    Thank you.


    Expert Comment

    I am having the exact same issue strangely enough. Only used to be with 1 of my servers but now with 3. I have a teamed pair public facing NIC's and a couple of NIC's for my iSCSI SAN. I seem to lose the public NICs' default gateway often. obviously this prevents any users outside the building from accessing the server and can be a pain.

    Expert Comment

    I am having almost the same issue:2 Nics,the Default Gaway is on the FrontNIC.But this morning ,the GW was gone.

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