Cisco VPN ports
L2TP protocol is assigned 115 as its port number. IPSec VPN ports assignments for uses of Encapsulation Security payload (protocol 50) and Authentication Header (protocol 51). Port 88 for Kerberos authentication in TCP/UDP and port 500 for Internet Security Association and Key Management Protocol in TCP/UDP. SSL VPN for secure HTTP application uses port 443. MPLS-in IP uses port 137 For the systems that use VPN hardware normally port 500,4500,10000 & 10001 are used. Hardware ports Hardware ports are an entirely different concept compared to software based network ports. All processors use assembly instructions to access the ports on the mother board or any add on boards. In the many hardware devices in the VPN market if we hear of number of ports being many these are referring to the number of simultaneous hardware connections that can be made. VPN ports for network setting is a bit complex when you have no knowledge of the protocols, the encryption and authentication techniques they use.
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Achord: A Variant of the Chord Lookup Service for Use in Censorship Resistant Peer-to-Peer Publishing Systems
Steven Hazel and Brandon Wileysah@thalassocracy.org, brandon@blanu.net The revision of this paper which was presented at IPTPS'02 is available here in postscript and pdf. Abstract Any peer-to-peer publishing system must provide a mechanism for efficiently locating published documents. For censorship resistant systems, it is particularly important that the lookup mechanism be difficult to disable or abuse. Chord [1] is a promising distributed lookup mechanism, because analysis has provided certain useful guarantees about the speed and correctness of Chord's operation. 1. The provable performance and correctness of Chord make it an attractive option for distributed lookup. Providing censorship resistance requires careful design of every component in the architecture of a peer-to-peer system. The last of these properties is particularly at odds with Chord's basic operation. 2. In an N-node Chord network, each node maintains a finger table of only O(log N) other nodes. 1. 2. 3. 4. 5.
VPN and Endpoint Security Clients
Enhance Productivity and Cut Costs Cisco VPN solutions provide exceptional security through encryption and authentication technologies that protect data in transit from unauthorized access and attacks. A Cisco VPN helps you: Use highly secure communications, with access rights tailored to individual users Quickly add new sites or users, without significantly expanding your existing infrastructure Improve productivity by extending corporate networks, applications, and collaboration tools Reduce communications costs while increasing flexibility Two VPN technologies are currently in use: site-to-site VPNs and remote access VPNs. Site-to-Site VPNs Site-to-site VPNs provide an Internet-based WAN infrastructure to extend network resources to branch offices, home offices, and business partner sites. Remote Access VPNs Remote access VPNs extend almost any data, voice, or video application to the remote desktop, emulating the main office desktop.
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PPTP Securely Tunneling to Linux server
NOTE: Running personal firewall software like ZoneAlarm or Sygate's Fire may cause issues. Either reconfigure these programs or disable them. Some ISPs (Internet Service Providers) may block services that would prevent you from getting into our system. Configuring Windows XP to establish a VPN tunnel (Point to Point Tunneling Protocol) connection to your office network is a straight forward process. The following procedure for configuring Windows XP assumes that a dial up connection to an ISP has already been configured on the client computer. Follow the steps below to configure a PPTP connection: Go to Start -> Settings ->Network and Dial-up Connections then select the New Connection Wizard icon. After selecting Finish, a logon box will appear. Initially, the settings for your connection to the Internet need to be checked to ensure the PPTP VPN connection to your network behaves as expected. Click on the WINS tab. DNS is an acronym for Domain Name System.
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