Cisco VPN error 412 will occassionally occur when using the Cisco VPN client.
The exact error message may differ between versions of the Cisco VPN client, but will be similar to this: Error Secure VPN Connection terminated locally by the Client. Reason 412: The remote peer is no longer responding. Causes for Cisco VPN Error 412
There are many causes of error 412, including: Poor network connection. Packet delay or loss can force the VPN session to drop. Hardware failure in a network...
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In most cases, disabling the firewall on your Netgear router is a really bad idea. In fact, it is such a bad idea that Netgear doesn't even make a button in their GUI that does this.
Nevertheless, we can effectively disable a Netgear router firewall just by adding a rule or two to the firewall configuration. Netgear Router Firewall Default Rules
Netgear devices with firewalls have two default rules: Outbound Services: Allow all access from the inside to the outside. Inbound...
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Every packet-based network has an MTU (Maximum Transmission Unit) size. The MTU is the size of the largest packet which that network can transmit.
Packets larger than the allowable MTU must be divided into multiple smaller packets, or fragments, to enable them to traverse the network. Network Standard MTU Ethernet 1500 Token Ring 4096 Packet Headers
Every IP packet has an IP (Internet Protocol) header which stores information about the...
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Packet Sniffing
Packet sniffing is listening (with software) to the raw network device for packets that interest you. When your software sees a packet that fits certain criteria, it logs it to a file. The most common criteria for an interesting packet is one that contains words like "login" or "password."
To do packet sniffing, you will have to obtain or code a packet sniffer that is capable of working with the type of network interface supported by your...
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Free firewalls have become very common and represent an excellent alternative to commercial firewall packages.
Most of these firewalls run under some form of Linux, FreeBSD, or OpenBSD.
Many of these free firewalls are front-ends for the lower-level firewall packages which ship with these operating systems, such as pf (Packet Filter), ipf (IPFilter), ipfw (IPFirewall), and iptables.
Free firewall packages which you can download include: Firestarter
Firesarter is a free firewall...
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A firewall is a software component that is developed to restrict unauthorized inward network access. It allows outward information flow. It is set up to control traffic flow between two networks by configured permissions like Allow, Deny, Block, Encrypt etc. They are normally employed to avoid illegal access to personal computers or corporate networks from external unsafe entities like the Internet.
All the information flowing in and out of the network is scrutinized by the firewall. If...
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Wireless traffic is considered to be those Internet protocol packets that are transmitted through an 802.11a, b, g, n, or i wireless protocol.
Monitoring Requirements
There are a few things to consider when you plan to setup wireless traffic monitoring. First you need to determine what kind of traffic you are intending to monitor, to or from your local systems, or to and from a system you do not have direct control of. Second, you need to have the appropriate wireless adapter installed...
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Peer Guardian is perhaps the most popular IP blocking software tool on the web. Peer Guardian is primarily used by the Peer2Peer sharing community to block the RIAA, MPAA and other organizations from tracking a sharer's IP address and online activity. In addition to blocking IP addresses, Peer Guardian also can block adware, spyware, government IP's and educational IP's. Peer Guardian is open source and originally developed by Phoenix Labs. The latest version is Peer Guardian 3...
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Kerberos is a network authentication protocol which utilizes symmetric cryptography to provide authentication for client-server applications.
The Kerberos Standard Definition
Kerberos is defined in RFC 1510 - The Kerberos Network Authentication Service (V5). The Kerberos Architecture
The core of a Kerberos architecture is the KDC (Key Distribution Server). The KDC stores authentication information and uses it to securely authenticate users and services.
This authentication is called...
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TLS (Transport Layer Security), defined in RFC 2246, is a protocol for establishing a secure connection between a client and a server. TLS (Transport Layer Security) is capable of authenticating both the client and the server and creating a encrypted connection between the two.
The TLS (Transport Layer Security) protocol is extensible, meaning that new algorithms can be added for any of these purposes, as long as both the server and the client are aware of the new algorithms. SSL vs...
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