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

with a few realizing of Linux defense threats and matters, or anybody drawn to securing their platforms in the back of a firewall. easy wisdom of Linux is presumed yet except that this booklet exhibits you the way to do the remaining, from configuring your procedure to facing protection breaches

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Extra resources for Designing and Implementing Linux Firewalls with QoS using netfilter, iproute2, NAT and L7-filter

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1D) was designed to prevent network loops. STP works by deactivating links that can form a network loop, raising the possibility of deploying redundant links in the network that, without STP, would create network loops. STP manipulation is a type of threat in which an attacker broadcasts STP configuration or topology change BPDUs (Bridge Protocol Data Units), forcing STP recalculations and expecting that the attacker becomes the root bridge. As root bridge, the attacker can sniff Ethernet frames belonging to other VLANs.

Teardrop sent fragmented IP packets that could not be assembled properly by the attacked machine, by manipulating the offset values of the packets. The effect was a kernel panic in Linux or a blue screen in Windows. A reboot solved the problem until the next attack. Layer 4 Security Threats TCP and UDP are the transport protocols found at OSI Layer 4—transport. We've learned about them in more detail in Chapter 1, with TCP being more complex than UDP because it's a connection-oriented protocol that has a flow-control mechanism (windowing), while UDP is simple and connectionless, and with no flow-control implemented in the protocol.

The DHCP lease time is configurable from 120 seconds to whatever the administrator chooses. DHCP starvation attack consists of consuming the IP address space allocated by a DHCP server. This can easily be accomplished by an attacker by broadcasting a large number of DHCP requests using spoofed MAC addresses. The DHCP server will lease its IP addresses one by one to the attacker until it runs out of available IPs for new, normal clients. This leads to Denial of Service for those clients in the network requesting IP addresses from the DHCP server.

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Designing and Implementing Linux Firewalls with QoS using netfilter, iproute2, NAT and L7-filter by Lucian Gheorghe


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