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2. When not to use a default route

If your system is connected to the Internet using either SLIP or PPP, then don't set the default route in Linuxconf. Just select the default route option of the specific connectivity package you are using (dip, pppd, slirp). Those packages will setup the default route when the link is up and remove it when it goes down. With PPP, IP numbers are often allocated dynamically from the other side, so you have little idea of the gateway IP until the link is up.

On complex networks with many LANs, with many gateways and even redundant gateways, your best bet is to use dynamic routing with packages like routed (supported by Linuxconf) or gated.


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