Default gateway route goes missing

  • Thread starter Thread starter John Wilkins
  • Start date Start date
J

John Wilkins

We have a win2k server that will not maintain a default
IP route. The machine is configured to have such a route
(10.0.1.1) but the route is not functioning and does not
appear in the routing table (route print).

If I make a change to the networking configuration, the
default route gets added and works fine, but when I
reboot the machine the default route, although still
configured in networking properties, is not present.

I can manually add the route and it works fine. If I make
the route persistant it doesn't survive a reboot.

Conclusion is that something is removing the route at
each boot. Question is what?
 
-----Original Message-----
Is this server multihomed?
Post 'ipconfig /all' results here.
.
Click to expand...

Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.

C:\Documents and Settings\Administrator.INTERFACE>
C:\Documents and
Settings\Administrator.INTERFACE>ipconfig /all

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : saturn
Primary DNS Suffix . . . . . . . : interface
Node Type . . . . . . . . . . . . : Broadcast
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : interface

Ethernet adapter HQ Main Lan:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R)
82540EM Based Network Conne
ction
Physical Address. . . . . . . . . : 00-C0-9F-26-
A8-02
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.0.1.21
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 10.0.1.20

C:\Documents and Settings\Administrator.INTERFACE>
 
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.

C:\Documents and Settings\Administrator.INTERFACE>
C:\Documents and
Settings\Administrator.INTERFACE>ipconfig /all

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : saturn
Primary DNS Suffix . . . . . . . : interface
Node Type . . . . . . . . . . . . : Broadcast
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : interface

Ethernet adapter HQ Main Lan:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R)
82540EM Based Network Conne
ction
Physical Address. . . . . . . . . : 00-C0-9F-26-
A8-02
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.0.1.21
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 10.0.1.20

C:\Documents and Settings\Administrator.INTERFACE>
 
Assuming that this is from the server and you only have 1 nic, how are you
connecting to the internet?

Marina

John Wilkins said:
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.

C:\Documents and Settings\Administrator.INTERFACE>
C:\Documents and
Settings\Administrator.INTERFACE>ipconfig /all

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : saturn
Primary DNS Suffix . . . . . . . : interface
Node Type . . . . . . . . . . . . : Broadcast
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : interface

Ethernet adapter HQ Main Lan:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R)
82540EM Based Network Conne
ction
Physical Address. . . . . . . . . : 00-C0-9F-26-
A8-02
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.0.1.21
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 10.0.1.20

C:\Documents and Settings\Administrator.INTERFACE>

-----Original Message-----
What is your server's IP address and subnet mask?




.
Click to expand...
Click to expand...
 
Internet connection is via a router/firewall box at
address 10.0.1.1.

As you can see, there is no default route to 10.0.1.1 so
we can't connect to the Internet. However, a default
route is configured in the networking properties.
 
The ipconfig didn't show the gateway. Have you added the 10.0.1.1 in the
Gateway field on the TCP/IP-properties of the nic?
Is the server fully patched?

Marina
 
The 10.0.1.1 gateway is added to the NIC properties. The
server is fully patched - there is another one virtually
identical to it that does not exihibit this behaviour.

If I modify the TCP/IP props for the NIC and save, the
default route does appear in the ipconfig or route print
table. When I reboot the server, the route disappears
again. If I forcible add a static persistant route using
the route command, the route appears but will not persist
through a boot.

Something appears to be removing the default route from
the routing table at boot, even though it is configured
in the NIC properties.
 
Hi John,

Well, there is something weird going on. Because the ipconfig/all you
posted, didn't have a gateway. If the gateway is added to the
nic-properties, it should show up in the ipconfig.
You shouldn't need to use the route-command.
Is there anything in the eventlogs?

Marina
 
Hi Marina,

Checked the logs, can't see anything that looks
suspicious. Something that may be affecting matter is the
fact that the server has a second NIC. However, this NIC
is not currently in use and is disabled in the networking
properties. Also we have another server setup just the
same is the problem one - same machine type, OS, build,
etc. It also has a second, disabled NIC. No problems with
this machine and the default route.

The only difference between the two that I can think
could make a difference is the fact the the working
machine is also DNS and the primary DC. Does this give
you any ideas?
 
Shouldn't matter that it is the DC and runs DNS. If you put in the gateway
in the nic-properties and do an ipconfig, does it show up?
Check the bindingorder to see that the internal nic is on top.

Marina
 
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