11.6. Router vs. Modem

For most Internet connections, there is a choice between two different connection options:

  1. A router typically supplied by a provider assumes the actual dial-up. The Intra2net system is then connected to it using the setting "Router with static IP".

  2. The line is connected to a dedicated modem and connected to the Intra2net system. The Intra2net system handles the dial-up.

Variant 1. The router has the advantage of being set up faster, since the router is usually delivered pre-configured by the provider. If this router has additional functionality, such as VoIP, it may also reduce the need for additional devices for specific functions.

Variant 1. A router has the following disadvantages:

  • One external IP is used by the router itself. All other devices, such as the Intra2net system, can only communicate via NAT and port forwarding.

  • If the Intra2net system is to be accessed externally (e.g. for Activesync, VPN or email delivery via SMTP) port forwarding has to be configured on the router.

  • Some routers have difficulties forwarding VPN connections correctly and without interference. This can often be fixed with a router firmware update, but not in all cases. In some cases, we have observed that long-lasting connections, as is common for site-to-site VPNs, do not function reliably and are interrupted after a few days or weeks.

  • Very few routers support port forwarding on the local network. This is necessary so that mobile devices (such as laptops) can use both the external DNS name or the external IP for access on the LAN and on the Internet.

Variant 2. A separate modem has the disadvantage that an additional modem is required and dial-up has to be set up once. If necessary, a VoIP upgrade must also be implemented using a separate device and connected to the Intra2net system.

However, there is the advantage that no port forwarding or NAT is required for services, especially the Intra2net VPN. Internal access to the services via the external IP is also possible without difficulty.