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route through a PPP Link.

Posted on 1998-04-07
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Last Modified: 2010-03-18
how to I set my Linux up so that my LAN can go to internet through my linux.  my localnet is 128.230.75.0
and my PPP gateway is 111.222.333.5, let's say.  my Linux machine's IP is 128.230.75.1.  
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Question by:Sieger
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alexbik earned 100 total points
ID: 1587582
Hi,

First of all, you shouldn't use the 128.230.75.0 network if it is not officially assigned to you. If it is, then you will only have to add a route for this network to your ethernet adapter, and setup all your clients to use the Linux machine as a gateway. If it is _not_ officially assigned, you should use one of the IP ranges that are reserved for local use. In both cases, make your default route point to the PPP link to your ISP.

If you use local reserved IP addresses, you will have to install either a proxyserver (like Squid), or set up your box to do IP masquerading. Proxies have to be supported by the clients, IP masquerading works in all cases, because the clients don't even notice.

You can find the complete HOWTO on IP masquerading at:

ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/mini/IP-Masquerade

Alex.
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by:Sieger
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I thought there might be other ways to go besides IP-Masquerade.. anyway, thanks for you answer!
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