Connectivity:Troubleshooting
Troubleshooting RAS
For Windows NT
Direct from the tech support team at Microsoft, these are the solutions to the
questions being asked most frequently by users of RAS under Windows NT.
How can I route TCP/IP packets from
tions, you need to configure the Win
work card on the RAS client's
my local LAN to the Internet through
dows NT 3.5x RAS client as follows to
computer should be blank.
a Windows NT RAS client?
allow it to function as a router.
5. Your local LAN clients must set
their Default Gateway to the IP
First, you must satisfy the following
1. Configure your RAS PhoneBook
address of the network card on the
conditions:
entry for either PPP or SLIP.
Windows NT RAS client.
2. Modify the DisableOtherSrc
6. You must set up a static route on
1. The RAS server must be a third
Packets registry. DisableOther
the third party PPP or SLIP server
party PPP or SLIP server.
SrcPackets is located in the HKEY_
that routes traffic destined for the
(Windows NT 3.5x RAS is curre
LOCAL_MACHINE subtree under
RAS client's local LAN via the RAS
ntly not designed to support LAN
the \System\CurrentControlSet\
IP address of the RAS client.
to LAN routing.)
Services\RasArp\Parameters sub
2. The third party RAS server must
key. It has a data type of REG_D
For additional information about
support routing tables that can be
WORD and can be set to 0 or 1.
using a Windows NT 3.5x RAS client to
configured to forward packets to
The default setting is 1. You must
route TCP/IP packets from your local
your LAN via the Windows NT
set the DisableOtherSrcPackets
LAN to the Internet, refer to Microsoft
3.5x RAS client connection.
parameter to 0.
Knowledge Base article Q121877,
3. TCP/IP is the protocol on both
3. Enable the IpEnableRouter value.
which is available on CompuServe or
sites.
IpEnableRouter is located in the
the Microsoft Network. Refer also to
4. The IP subnet address of your local
HKEY_LOCAL_MACHINE sub
"Using RAS for Routing of IP Packets"
LAN is different from the IP sub
tree under the \System\Current
in the NT Resource Kit.
net address of the RAS connection.
ControlSet\Services\Tcpip\Para
5. If connecting your local LAN to
meters subkey. It has a data type
After upgrading to Windows NT 3.51,
the Internet, your LAN must use a
of REG_DWORD and can be set
I am no longer able to send or receive
registered IP address.
to 0 or 1. Change the value to 1 to
TCP/IP packets via my RAS PPP con
enable this parameter.
nection.
If you have satisfied these condi
4. The Default Gateway for the net
This problem will occur if you use the
same IP address for your network in
terface card that you use for your RAS
"If you have enabled the "Use default
PPP connection. Using the same IP ad
dress for more than one interface is an
gateway on remote network" checkbox in
illegal configuration with TCP/IP.
Under Windows NT 3.5, you were able
the TCP/IP settings of your RAS Phone
to use the same IP address for both
interfaces and properly route packets
Book entry, any TCP/IP packets with a
via your RAS PPP connection due to a
bug in RAS. This bug has been fixed in
Windows NT 3.51.
destination IP address that indicates it is
To correct this problem, disable the
binding of the TCP/IP protocol to your
on the same IP subnet as the Windows NT
network interface card or use a differ
ent IP address for the network interface
machine's network interface card will be
card than the IP address you are using
for your RAS PPP connection.
sent via the network interface card."
Additionally, make sure you select
the "Use default gateway on remote
Issue 67 page 19
File: C1329.1
PC Network Advisor
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