December 2000
Intermediate to advanced
800 pages
22h 41m
English
Content preview from Special Edition Using Linux®, Sixth EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Setup
IP masquerading is accomplished though the packet-filtering firewall capabilities of modern Linux kernels. When an outgoing network packet hits the firewall machine (the server with IP masquerading set up on it), the firewall rewrites elements of each packet to make them look as if they are emanating from the firewall and not the machine behind the firewall. The return packets are modified to go back to the machine that sent the original outgoing packets. To both ends of the transaction, nothing odd seems to be going on at all.
Some services, such as FTP, require special handling, thus the module to support FTP connection tracking. This is because an active FTP connection uses two separate ports, 21 for control, and 20 for data transfer. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.