Re: Misbehaving routing tables

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance



"DHK" <DHK@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:8AF9959E-B2B9-49B9-AFDE-CCF8FAA4AED4@xxxxxxxxxxxxxxxx
My client has Windows Server 2003 R2 Standard Edition SP2. It has two NICs
installed. 192.168.10.x is to an internal network. 192.168.20.x is only
attached to a firewall. The metrics are supposed to give priority to
192.168.20.x, but it isn't working out that way. I have written a bat file
for modifying the routing table, but it isn't working.

I have including a portion of the routing table below immediately following
a restart of the server:
ctive Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.10.254 192.168.10.2 10
0.0.0.0 0.0.0.0 192.168.20.254 192.168.20.5 10
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.10.0 255.255.255.0 192.168.10.2 192.168.10.2 10
192.168.10.2 255.255.255.255 127.0.0.1 127.0.0.1 10
192.168.10.255 255.255.255.255 192.168.10.2 192.168.10.2 10
192.168.20.0 255.255.255.0 192.168.20.5 192.168.20.5 10
192.168.20.5 255.255.255.255 127.0.0.1 127.0.0.1 10
192.168.20.255 255.255.255.255 192.168.20.5 192.168.20.5 10
224.0.0.0 240.0.0.0 192.168.10.2 192.168.10.2 10
224.0.0.0 240.0.0.0 192.168.20.5 192.168.20.5 10
255.255.255.255 255.255.255.255 192.168.10.2 192.168.10.2 1
255.255.255.255 255.255.255.255 192.168.20.5 192.168.20.5 1
Default Gateway: 192.168.10.254

The .bat file I use to modify the routing table is as follows. It is run
every time the system restarts:
route change 0.0.0.0 Mask 0.0.0.0 192.168.20.254 Metric 10 IF 0x10004
route change 0.0.0.0 Mask 0.0.0.0 192.168.10.254 Metric 20 IF 0x10003

When I run the bat file manually, it does not change the routing table
metrics.

If the server is left alone, a user is able to access the server via the
external address. The router forwards all traffic to 192.168.20.x. A full TCP
session is established and sustained. However, after a few days, the routing
table changes as follows:
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.10.254 192.168.10.2 10
0.0.0.0 0.0.0.0 192.168.20.254 192.168.20.5 20
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.10.0 255.255.255.0 192.168.10.2 192.168.10.2 10
192.168.10.2 255.255.255.255 127.0.0.1 127.0.0.1 10
192.168.10.255 255.255.255.255 192.168.10.2 192.168.10.2 10
192.168.20.0 255.255.255.0 192.168.20.5 192.168.20.5 20
192.168.20.5 255.255.255.255 127.0.0.1 127.0.0.1 20
192.168.20.255 255.255.255.255 192.168.20.5 192.168.20.5 20
224.0.0.0 240.0.0.0 192.168.10.2 192.168.10.2 10
224.0.0.0 240.0.0.0 192.168.20.5 192.168.20.5 20
255.255.255.255 255.255.255.255 192.168.10.2 192.168.10.2 1
255.255.255.255 255.255.255.255 192.168.20.5 192.168.20.5 1
Default Gateway: 192.168.10.254

This issue was addressed more than a year ago and for reasons unknown to me,
the problem has returned.

I did notice that the default gateway is the 192.168.10.x network, not the
192.168.20.x network. Is that part of the problem?

Can you advise me how I can fix this issue?

Thanks.
--
DHK

A machine should only have one default gateway set, and therefore only one default route. The default gateway on the internal NIC should be blank.


.

Relevant Pages

  • Re: AIX 1.3 Failures and Fables
    ... DESTINATION GATEWAY FLGS REFCNT USE INTERFACE ... Is my interpretation of the AIX 1.3 #man route correct? ... Manually manipulates the routing tables. ... Is the destination host or network. ...
    (comp.sys.ibm.ps2.hardware)
  • Re: AIX 1.3 Failures and Fables
    ... I don't know if 1.3 has SMIT or its equivalent but there should be some way to add a default gateway which is your router. ... Is my interpretation of the AIX 1.3 #man route correct? ... Manually manipulates the routing tables. ... Is the destination host or network. ...
    (comp.sys.ibm.ps2.hardware)
  • Re: Cant figure out simple routing between 2 Windows domains
    ... a static route like so?: ... If the router has an address in 192.168.1.x and 192.168.2.x, and the PCs have that as it's default gateway, it'll just work. ... network to the other? ... seems to be that case that to enable routing you need to enable RIP, ...
    (comp.dcom.sys.cisco)
  • Misbehaving routing tables
    ... The metrics are supposed to give priority to ... I have including a portion of the routing table below immediately following ... Default Gateway: 192.168.10.254 ... I did notice that the default gateway is the 192.168.10.x network, ...
    (microsoft.public.windows.server.networking)
  • Re: drivers/net/usb/asix - Re: WS-UL220G USB 2.0 Gigabit Ethernet Adapter in Dell Inspiron 7
    ... believe that anything over 16 (hops) is considered unusable. ... The unused default network on my jaunty box ... Routing table metrics have nothing to do with Internet hop count or time ...
    (Ubuntu)