RE: Route added by RRAS that overrides local LAN route on NIC
- From: v-crinal@xxxxxxxxxxxxxxxxxxxx ("Crina Li")
- Date: Mon, 09 Oct 2006 07:00:39 GMT
Hi John,
Thank you for posting in SBS newsgroup.
I am sorry for the delayed response due to weekend. Please understand that
the newsgroups are staffed weekdays by Microsoft Support professionals to
answer your systems and applications questions. Your understanding is
greatly appreciated!
From your description, do you mean the LAN clients will lose the connectionwith SBS if you create VPN to SBS from remote client?
To narrow down the problem, would you please help me collect the following
information?
1. Are you creating VPN to SBS or router from remote client? It means are
you using router or SBS as VPN server?
2. Post the ipconfig/all result from SBS, remote client and LAN client
before creating VPN and after creating VPN.
3. Post the route print result.
Also, you may need to follow the steps below to configure VPN access on an
SBS environment:
1. Run CEICW, follow the wizard and select Enable firewall and then make
sure Virtual Private Networking (VPN) is selected in the Services
Configuration page. And make sure you have typed the public FQDN of the SBS
server on the Web Server Certificate page.
2. Run Remote Access Wizard in Server Management\Internet and
E-mail\Configure Remote Access, and select VPN access in the Remote Access
Method page. After finishing this wizard, RRAS is configured to allow
inbound VPN access, and it can assign IP addresses to the VPN clients by
using DHCP.
Note: When we run the remote access wizard to set up the VPN service, we
need to input the public IP address or the public FQDN of the SBS server.
We need to make sure that the address can be accessed from the internet.
3. On the VPN client, go to https://publicFQDN/remote, clear I'm using a
public or shared computer, log in and download Connection Manager.
4. Install Connection Manager on the VPN client.
5. Is there a hardware router installed in front of the SBS server? If so,
ensure that the port forwarding for TCP 1723 and GRE port (protocol number
47) are opened. PPTP VPN is negotiating a connection on TCP port 1723 and
send data to and from the PPTP server using the GRE protocol (IP Protocol
47, 0x2F if you are looking in Network Monitor). You should open port 1723
on the router and also make sure IP Protocol 47 is allowed.
I appreciate your time and look forward to hearing from you.
Best regards,
Crina Li (MSFT)
Microsoft CSS Online Newsgroup Support
Get Secure! - www.microsoft.com/security
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| Thread-Topic: Route added by RRAS that overrides local LAN route on NIC
| thread-index: AcbqJyGWs4FS1gogRLGjAUd4XC/dGA==
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| From: =?Utf-8?B?Sm9obiBQaGlsaXBz?= <JohnPhilips@xxxxxxxxxxxxxxxxxxxxxxxxx>
| Subject: Route added by RRAS that overrides local LAN route on NIC
| Date: Sat, 7 Oct 2006 08:42:01 -0700
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| I have a SBS 2003 with dual NICs, but I am running the machine in a
single
| NIC configuration. I have set-up RRAS for remote access, which I have
done
| many times before on other machines (both SBS and Win2003). For this
| particular machine, when a RAS clent connection, the RRAS on the server
adds
| a 2nd route for the local LAN to the routing stack. With the same
| destination, but with the vpn client's assigned IP address as the gateway.
|
| To illustrate:
|
| Before the VPN client connects, the routing table contains 10.0.0.0/24
with
| a gateway of 10.0.0.1 (Server Local Area Connection address) on Interface
| 10.0.0.1. This entry has a metric of 10.
|
| After the VPN client connects, the routing table contains a 2nd entry of
| 10.0.0.0/24 with a gateway of 10.0.0.118 (the address assigned to the RAS
| client) on interface 10.0.0.121 (RRAS Internal Interface). This entry
has a
| metric of 1. Since this route has a lower metric it becomes the
preferred
| route for the LAN and not of the PCs on the LAN can communicate with the
| server.
|
| When the RAS client disconnects the route is removed, and the PC on the
LAN
| can reach the server again. I have dug through the RRAS configs many
times
| and can't explain this. Does anyone know what could be causing this?
Or,
| can you provide some pointers on how you control the routes that get
added to
| the server when a RAS client connects? Also, does anyone know if you a
| 10.0.0.0 network number is a problem. This is a class A private network,
and
| I normally use 192.168.x.x which is a class C. Could this be some issue
with
| the 10.0.0.0 being treated different due to it's class?
|
| Thanks,
| John
|
.
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