Using Split-B to Simultaneously Connect the Main Office LAN to the Internet and to a Remote Office

Application Diagram

The Main Office LAN can connect to the Internet while having a connection to a Remote Office network.

Assumptions

• Both Main and Remote Office LANs are running Static IPs.
• A Static account with several valid IP addresses is provided by ISP.
• Main Office LAN is using legal IPs.
• Main Office is able to access the Internet and the Remote Office at the same time
• Remote Office LAN is using illegal IPs.
• Remote Office is able to access the Main Office but not able to access the Internet.
• Main Office initializes the connection to the Remote Office.

Configurations

IP address assignment

ISP assigns legal 207.214.100.177-190/255.255.255.240 address range. This is the range Main Office is running.

Remote Office is running 200.200.200.1-255/255.255.255.0 address range. This is an illegal address range.

Router at the Main Office

• A dial-out Client.
• Static IP Mode.
• NAT is disabled.
• DHCP is disabled.
• With Static IP of 207.214.100.177/255.255.255.240.
• PC's IP address range is from 207.214.100.178-190. Gateway is 207.214.100.177.

  Two Profiles are required

  • Profile 1
  • Profile Name: Go to the Internet (Assigning name is optional)
  • Select "Use this profile to dial out to ISP"
  • Use only one channel
  • Profile 2
  • Profile Name: Go to the Remote Office (Assigning name is optional)
  • Select "Use this profile to dial out to ISP"
  • Use only one channel

    Routing Table

Router at the Remote Office

• A dial-in Server.
• Static IP Mode.
• NAT is disabled.
• DHCP is disabled.
• With Static IP of 200.200.200.1/255.255.255.0.
• PC's IP address range is from 200.200.200.2-254. Gateway is 200.200.200.1.

  One Profile is required

  • Profile 1
  • Profile Name: From Main Office (Option).
  • Select "Use this profile to set the router as Dial-in Server".
  • Specify ISDN Interface IP as 207.214.100.177/255.255.255.240.
  • Use only one channel.

  Routing Table

Tips

• If the connection between Main and Remote Office can be initialized by both ends, Main Office router has to add a profile as a "Dialin Server", and Remote Office has to add a profile as a "Dial out Client".