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Linux.com: An Introduction to IP Masquerading (Part 2 of 2)

Jun 04, 2000, 20:06 (0 Talkback[s])
(Other stories by Matt Craven)


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"Now that you've configured and compiled the Linux kernel to support IP Masquerading, we're going to setup your Ethernet cards, and configure the kernel firewall."

"In the first part we talked about "private" IP addresses. In the following example, we'll be using addresses in the range from to This is part of one of three special blocks of addresses set aside for the purpose of building a private network. These addresses are not routable on the Internet, and if such a network address were to be used to communicate directly with the Internet, packets coming from that address would be discarded by the first router they encounter. For more on private IP addresses, please see the document RFC 1918."

"First, we'll deal with the case in which you have two Ethernet cards: one connected to your cable/DSL modem, which we'll call eth0; and another connected to an Ethernet hub, which we'll call eth1. Since most Internet service providers hand out IP addresses dynamically whenever you boot your computer, configure eth0 to obtain an IP addresses dynamically (typically using the Dynamic Host Configuration Protocol). Please see the DHCP mini-HOWTO for distribution-specific information on how to handle this."

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