RE: VPN and network connectivity issue
- From: v-edtian@xxxxxxxxxxxxxxxxxxxx (Edward Tian)
- Date: Thu, 06 Oct 2005 07:33:38 GMT
Hi Philip:
Thank you for posting here.
>From the description, I understand your VPN connection can be successfully
established, but you cannot ping the IP/name of the remote clients. If I
have misunderstood your concern, please feel free to let me know.
Based on the schema you provided, both the local computers and the remote
computers are using the same network schema 192.168.1.x/255.255.255.0,
which will cause confliction. Technically speaking, the system uses route
table to route IP traffics. By default, the local subnet does not need
route. The system will use broadcast to find local clients or send traffic
directly to the local address. If the remote client has the IP address
which is in the range of your local subnet, once the VPN client tries to
access the resource in the destination network (where the VPN server
resides), it will not find the way out since its route table treat the
request as a local network request. That's why there is no response from
the server.
To fix this kind of issue, we need to use different subnet addressing in
the VPN client and VPN server sites. For example, assign 192.168.1.x to the
VPN client side and 192.168.0.x to the VPN Server side. That is the
recommended configuration to establish a VPN connection. In this way, the
traffic will be sent to the right destination.
If the problem persists after you change the schema, please help to gather
the following information:
1. Please re-run the CEICW Wizard in order to make sure the network
connection is properly configured. You can refer to this step-by-step KB
article:
825763 How to configure Internet access in Windows Small Business Server
2003
http://support.microsoft.com/?id=825763
2. After the VPN connection established, please type ipconfig/all on the
client side and post the output to me in the reply for analysis.
3. After the VPN connection established, can you ping the ip/computername
of the remote VPN Server?
4. Does this problem occur on all the VPN clients?
5. If you plug a laptop directly to the router/modem, and then establish
the VPN connection, can you ping the IP/name of the remote clients?
6. Do you install ISA on the SBS Server? If so, which version is it, ISA 2k
or ISA 2k4?
I appreciate you taking time to perform the test. Please feel free to let
me know if there is anything I can do for you.
Have a nice day!
Best Regards
Edward Tian(MSFT)
Microsoft CSS Online Newsgroup Support
Get Secure! - www.microsoft.com/security
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--------------------
| Thread-Topic: VPN and network connectivity issue
| thread-index: AcXKCVEuc+J17EnGQG2kPG+J5oc2bA==
| X-WBNR-Posting-Host: 220.234.172.107
| From: =?Utf-8?B?UGhpbGlw?= <Philip@xxxxxxxxxxxxxxxxxxxxxxxxx>
| Subject: VPN and network connectivity issue
| Date: Wed, 5 Oct 2005 17:03:01 -0700
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|
| I have established a PPTP VPN connection to a remote office. The VPN
tunnel
| was successfully established, but I cannot ping the IP/servername of the
| remote clients.
|
| The local network uses the 192.168.1.1-192.168.1.30 schema, and the
remote
| office are taking the 192.168.1.100-192.168.1.200. Both of them are using
the
| SBS Server 2003. I have run the Remote Access Wizard and ICW. Is there
| anything wrong?
|
| Philip
|
.
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