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I'm a scientific programmer with a loose grasp of what goes on under the hood in my small home network so bear with me whilst I try and explain using the correct words if possible.

My home network of five PCs (Windows 7, Vista, 2003, 2 x XP) uses the 192.168.0.0 range of IP addresses. My ADSL router is 192.168.0.1 and is set to do DHCP and all that good stuff. So far, so good. Most importantly I can connect to my local web server on 192.168.0.42.

I frequently have to connect up to a client's VPN using Checkpoint SecureClient. When I do so I'm given a 10.something IP address on the 'virtual' network card.

If I'm connected to the VPN I can no longer connect to my 192.168.0.42 web server.

How can I tell my PCs to only go via the VPN for anything beginning 10.* and to stay 'local' for everything else?

(below added following Chris Thorpe's answer)

BTW I don't see the VPN connection under Control Panel. I just see my physical NIC. Here's what I see running ipconfig, if that helps:

Ethernet adapter Local Area Connection* 6:

   Connection-specific DNS Suffix  . : <removed for security!> 
   IPv4 Address. . . . . . . . . . . : 10.14.2.130
   Subnet Mask . . . . . . . . . . . : 255.255.255.128
   Default Gateway . . . . . . . . . :

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . :
   IPv4 Address. . . . . . . . . . . : 192.168.0.101
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.0.1

(another edit following gravyface's response)

A route print gives 50+ lines of routing info. Here's some lines if that helps...

===========================================================================
Interface List
 11 ...54 ec 6d 95 66 05 ...... Check Point Virtual Network Adapter For SecureClient

  8 ...00 19 d1 6a 79 cb ...... Intel(R) 82566DC Gigabit Network Connection

  1 ........................... Software Loopback Interface 1

===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0      192.168.0.1    192.168.0.101     10
         10.0.2.0    255.255.255.0      10.14.2.129      10.14.2.130      1
         10.1.0.0      255.255.0.0      10.14.2.129      10.14.2.130      1
         10.2.0.0      255.254.0.0      10.14.2.129      10.14.2.130      1
         10.4.0.0      255.255.0.0      10.14.2.129      10.14.2.130      1

<lots of 10.*  removed>
<some seemingly random IP addresses removed until we get to the 192.168 >

      192.168.0.0    255.255.255.0         On-link     192.168.0.101    266
      192.168.0.0    255.255.255.0      10.14.2.129      10.14.2.130      1
    192.168.0.101  255.255.255.255         On-link     192.168.0.101    266
    192.168.0.101  255.255.255.255      10.14.2.129      10.14.2.130      1
    192.168.0.255  255.255.255.255         On-link     192.168.0.101    266
    192.168.0.255  255.255.255.255      10.14.2.129      10.14.2.130      1
      192.168.4.0    255.255.255.0      10.14.2.129      10.14.2.130      1
     192.168.16.0    255.255.255.0      10.14.2.129      10.14.2.130      1
     192.168.64.0    255.255.255.0      10.14.2.129      10.14.2.130      1
     192.168.67.0    255.255.255.0      10.14.2.129      10.14.2.130      1
    192.168.120.0    255.255.255.0      10.14.2.129      10.14.2.130      1
    192.168.125.0    255.255.255.0      10.14.2.129      10.14.2.130      1
    192.168.140.0    255.255.255.0      10.14.2.129      10.14.2.130      1
    192.168.150.0    255.255.255.0      10.14.2.129      10.14.2.130      1
    192.168.250.3  255.255.255.255      10.14.2.129      10.14.2.130      1
    192.168.250.8  255.255.255.254      10.14.2.129      10.14.2.130      1
    192.168.253.1  255.255.255.255      10.14.2.129      10.14.2.130      1
    192.168.253.2  255.255.255.255      10.14.2.129      10.14.2.130      1
    192.168.254.3  255.255.255.255      10.14.2.129      10.14.2.130      1
    192.168.254.8  255.255.255.254      10.14.2.129      10.14.2.130      1
   192.168.254.10  255.255.255.255      10.14.2.129      10.14.2.130      1
    192.168.255.1  255.255.255.255      10.14.2.129      10.14.2.130      1
    192.168.255.2  255.255.255.255      10.14.2.129      10.14.2.130      1

<some other non 192.168* removed>

  255.255.255.255  255.255.255.255         On-link         127.0.0.1    306
  255.255.255.255  255.255.255.255         On-link       10.14.2.130    256
  255.255.255.255  255.255.255.255         On-link     192.168.0.101    266
===========================================================================
Persistent Routes:
  None

IPv6 Route Table
===========================================================================
Active Routes:
 If Metric Network Destination      Gateway
  1    306 ::1/128                  On-link
  1    306 ff00::/8                 On-link
===========================================================================
Persistent Routes:
  None
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migrated from serverfault.com Aug 21 '10 at 9:51

This question came from our site for system and network administrators.

2 Answers 2

Go into:

  1. Control Panel -> Network Connections -> find your VPN connection
  2. Right-click it and select properties.
  3. Find the TCP/IP settings and then the 'advanced' settings pane.
  4. Untick 'use default gateway on remote network'
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The CheckPoint VPN client should be doing split tunneling by default, that is, there will be a route (you can run print route to see what I mean) that directs all traffic destined to the 10.0 subnet to your VPN interface/gateway. If it isn't then you can uncheck it: right-click Systray icon > Settings > Properties of your profile > Advanced tab > "Route all traffic through gateway" or something like that and uncheck it.

What this means is that you shouldn't have any problems getting to your webserver by IP but perhaps the CheckPoint is changing your DNS settings? Do you have a DNS server running? i.e. do you normally access your webserver via IP (http://192.168.0.42) or DNS?

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