October 2006
Intermediate to advanced
288 pages
6h 10m
English
book
Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT and l7-filter
by Lucian Gheorghe
Content preview from Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT and l7-filter
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Packet Mangling with iptables
The term "mangling" might mislead people to conceive it as malicious—packet mangling is nothing like that at all. Packet mangling refers to the process of intentionally altering data in IP packet headers before or after the routing process.
Well, not all fields of the IP packet header can be modified in the mangle table, but that is not necessary.
Let's recall what an IP packet header looks like:
We have already discussed NAT, where we saw that we can "mangle" a packet by modifying the Source IP address and Destination IP address fields of the IP header. This mangling of packets is done only with NAT and is a part of ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.