Set Netmask on Direct Incomming Connection

[AlArcher]

I have a direct serial interface between an XP box and an embedded controller
that communicates via PPP. The XP box MUST supply an IP address to the
embedded device. So I created a new connection under "Network Tasks" within
the Network Connections Dialog and set up all the parameters including the
Incomming TCP/IP properties to specify the IP address range to assign the
device.

Everything connects great.

I need to be able to route packets from the XP box to different IP addresses
on the network controller so I wanted to add a route to the route table to
allow routing of packets to the embedded controller and use the embedded
controller as a gateway.

When I attempted to add a route to the route table the route was refused
because the netmask on the IP address assigned to the XP box side of the ppp
connection was 255.255.255.255.

Is there a way to change the netmask assigned to the XP box?

I beleive this is assigned by RAS and I could find no means to change it
using netsh.

ANY help would be greatly appreciated.

Al

 

[AlArcher]

I decided to provide additional information about my goals and what I have
attempted. Here is the additional information.

My goal is to route from a Windows XP box through an embedded controller
connected to the Windows XP box via a direct serial link that and is required
assign the IP address to the embedded controller.

I have a direct serial interface between an XP box and an embedded
controller that communicates via PPP. The XP box MUST supply an IP address
to the embedded device. So I created a new connection under "Network Tasks"
within the Network Connections Dialog and set up all the parameters including
the
Incomming TCP/IP properties to specify the IP address range to assign the
device.

Everything connects great.
I can send packets to the 192.168.1.82 device (embedded controller)
through the XP box.

I need to be able to route packets from the XP box to different IP addresses
on the network controller so I wanted to add a route to the route table to
allow routing of packets to the embedded controller and use the embedded
controller as a gateway.

When I attempted to add a route to the route table the route was refused
because the netmask on the IP address assigned to the XP box side of the ppp
connection was 255.255.255.255.

Is there a way to change the netmask assigned to the XP box PPP interface?
Is there a way to set the Gateway on the PPP interface?
Is there any other way to allow packets destined for 192.168.2.0 to be
routed out the PPP interface?

I believe this is assigned by RAS and I could find no means to change it
using netsh.

Here are some details of what I see on the XP box:

===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x1000002 ...00 53 45 00 00 00 ...... WAN (PPP/SLIP) Interface
0x1000003 ...00 d0 59 3d 6e db ...... Intel 8255x-based Integrated Fast
Ethernet
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.1.81 255.255.255.255 127.0.0.1 127.0.0.1 1
192.168.1.82 255.255.255.255 192.168.1.81 192.168.1.81 1
255.255.255.255 255.255.255.255 192.168.1.81 1000003 1
===========================================================================
Persistent Routes:
None

C:\Scripts>ipconfig

Windows 2000 IP Configuration

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Cable Disconnected

PPP adapter RAS Server (Dial In) Interface:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.1.81
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :


C:\Scripts>ROUTE ADD 192.168.2.0 MASK 255.255.255.0 192.168.1.82
The route addition failed: Either the interface index is wrong or the
gateway do
es not lie on the same network as the interface. Check the IP Address Table
for
the machine.



===========================================================================
Attempt to change the subnet mask using netsh:

First find the interface name:
===========================================================================
C:\Scripts>netsh
netsh>interface
interface>ip
interface ip>
interface ip>show interface

MIB-II Interface Information

Index: 16777218
User-friendly Name: Internal
GUID Name: Internal
Type: PPP
MTU: 0
Speed: 0
Physical Address:

===========================================================================
First use a command that we know the syntax is correct:
===========================================================================

interface ip>set address name="Internal" source=dhcp

Error obtaining configuration for interface Internal.

 

[AlArcher]

I figured it out.

When working with a PPP interface you MUST specify the interface in the
Route Add line. For example

Route Add 0.0.0.0 mask 0.0.0.0 192.168.1.82 IF 0x1000002

or

ROUTE ADD 192.168.2.0 MASK 255.255.255.0 192.168.1.82 IF 0x1000002

I am posting this for the next person that runs into this interesting issue.