Charly's Column The Sysadmin’s Daily Grind: Portfwd
Aug 31, 2005Incoming TCP connections do not always end up where they are supposed to. A freely configurable redirector points digital debris in the direction of a new and better place.
more »TCP Hijacking Understanding and preventing TCP attacks
Aug 31, 2005It is quite easy to take a TCP connection down using a RST attack, and this risk increases with applications that need long-term connections, such as VPNs, DNS zone transfers, and BGP. We’ll describe how a TCP attack can happen, and we’ll show you some simple techniques for protecting your network.
more »Socks 5 Examining the generic Socks version 5 proxy protocol
Jun 30, 2005Socks is a universal proxy protocol for TCP and UDP that allows internal hosts to securely pass the firewall and authenticates users. This article describes the latest version of the Socks proxy protocol and shows how to implement it.
more »ARP Spoofing ARP spoofing and poisoning
Jun 30, 2005Any user on a LAN can sniff and manipulate local traffic. ARP spoofing and poisoning techniques give an attacker an easy way in.
more »Security Intro Knowing the ways of the enemy
Jun 30, 2005more »
SSPE Security Policies SSPE: Managing security policies for multiple firewalls
Jun 30, 2005The Simple Security Policy Editor (SSPE) helps you organize your network and keep track of security policies across multiple firewalls. You can reference a central policy to generate rulesets for packet filters and VPN gateways.
more »Books
Jun 30, 2005more »
Charly's Column The Sysadmin’s Daily Grind: Mail and Queuegraph
May 31, 2005Worms, mail bombs, and users who send multiple megabyte Powerpoint files across the wire give Postfix administrators plenty of reasons to view their charges with a critical eye from time to time.
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