Download Designing and Implementing Linux Firewalls with QoS by Lucian Gheorghe PDF

By Lucian Gheorghe

Methods to safe your method and enforce QoS utilizing real-world eventualities for networks of all sizes

* enforcing Packet filtering, NAT, bandwidth shaping, packet prioritization utilizing netfilter/iptables, iproute2, category established Queuing (CBQ) and Hierarchical Token Bucket (HTB)
* Designing and enforcing five real-world firewalls and QoS eventualities starting from small SOHO workplaces to a wide scale ISP community that spans many cities
* construction clever networks via marking, queuing, and prioritizing sorts of traffic

In Detail
Firewalls are used to guard your community from the surface international. utilizing a Linux firewall, you are able to do much more than simply filtering packets. This booklet indicates you ways to enforce Linux firewalls and caliber of provider utilizing useful examples from very small to large networks.

After giving us a historical past of community safety, the publication strikes directly to clarify the fundamental applied sciences we'll paintings with, specifically netfilter, iproute2, NAT and l7-filter. those shape the crux of creating Linux firewalls and QOS. The later a part of the e-book covers five real-world networks for which we layout the safety regulations, construct the firewall, setup the script, and make sure our install. offering simply invaluable theoretical historical past, the ebook takes a pragmatic method, proposing case experiences and lots of illustrative examples.

The writer attracts on his event to supply the reader invaluable suggestion at the most sensible practices. supplying basically important theoretical heritage, the ebook takes a pragmatic process, providing case stories and lots of illustrative examples.

Who this publication is written for?
This publication is aimed toward Linux community directors with a few figuring out of Linux protection threats and concerns, or anybody attracted to securing their platforms in the back of a firewall. uncomplicated wisdom of Linux is presumed yet except that this publication indicates you ways to do the remainder, from configuring your approach to facing safety breaches.

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Example text

This will result in all the traffic passing through the attacker's computer, thus making it really easy for him or her to sniff all the network traffic from the clients. The rogue DHCP server can be set up even without performing the DHCP starvation attack, as clients accept the first DHCPOFFER they receive. Both these attacks can be easily accomplished using gobbler, a simple tool that can be found on the Internet. Unfortunately, only switches can protect users against these attacks. DHCP starvation attack can be prevented by using port security features that don't allow more than X MAC addresses on one port (the same method of prevention as for CAM attacks).

Users are assigned IP addresses by ISPs. net A local area network connected to the Internet through a router doesn't always need public IP addresses for all the devices in that network. The devices will use local IP addresses, and when going outside the network, the router can do Network Address Translation (NAT), a process that translates the local IP address of the device into one IP address that is actually routed on the Internet to that router. NAT will be explained in greater detail later in this book.

Padding: Extra zeros are added to this field to ensure that the IP header is always a multiple of 32 bits. Data is not a part of the IP header. It contains upper-layer information (TCP or UDP packets) and has a variable length of up to 64 bytes. If an IP packet needs to go out on an interface that has a MTU (Maximum Transmission Unit) size of less than the size of the IP packet, the Internet Protocol needs to fragment that packet into smaller packets matching the MTU of that interface. If the "Don't Fragment" bit in the Flags field of the IP packet is set to 1 and the packet is larger than the MTU of the interface, the packet will be dropped.

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