Software maker Opera's decision to support BitTorrent has added to some security experts' worries that applications which require open connections through firewalls are becoming increasingly popular. . Last week, the Norwegian company revealed that its latest technical preview adds support for downloading BitTorrent files, or torrents. BitTorrent, a peer-to-peer protocol that speeds files sharing by allowing every client to serve up pieces of a large file, requires that firewalls allow connections to the client software. With the adoption, the alternative Internet browser is the latest application to ask users to open ports, the numerical addresses that software applications use for communication. Some voice-over-Internet applications also require a direct connection to the Internet and need ports to be open if the hardware is placed behind a firewall. If such applications grow more popular, security may suffer, said Johannes Ullrich, chief research officer for the Internet Storm Center, a network-threat monitoring service hosted by the SANS Institute. "Opening more ports is never a good idea," he said. "Adding more functionality to heavily attacked applications like Web browsers isn't that great (of an idea) either." The link for this article located at SecurityFocus is no longer available. . The integration of BitTorrent into Opera has sparked discussions regarding potential vulnerabilities associated with port exposure and the handling of firewall configurations.. BitTorrent, Firewall Management, Open Ports, Application Security. . Brittany Day
Scanning helps one to know what services are running on a machine. This will show the open ports on which services are listening for connections. First we will determine whether the target machine is alive or not. This can be . . . . Scanning helps one to know what services are running on a machine. This will show the open ports on which services are listening for connections. First we will determine whether the target machine is alive or not. This can be done by sending a icmp echo request packet to the server. The server would respond with a icmp echo reply showing that it's alive. The process to do this on a range of hosts or ipaddresses is known as ping sweep. Of the many methods used, we will look on ICMP ping and echo port ping. Your machine will send an icmp echo request (type 8) to the target machine and it would respond with an icmp echo reply(type 0) if it is alive. You can use the Unix ping command to do this: The link for this article located at EBCVG is no longer available. . Master the art of network scanning to efficiently detect active services and accessible ports on distant servers.. Network Scanning, Service Discovery, Open Ports, ICMP Ping, Ping Sweep. . Anthony Pell
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