Ever had an ipv4 network address that is supposed to migrate over via a high availability mechanism simply not work or even stranger if there were several addresses some do and some do not? An experienced network administrator probably has seen mysterious non-migrating addresses, however, within this context is presented a rather interesting "solution" to when it has been observed.. The Setup For simplicity two addresses will be used, the idea being if a service or server in part of a 2 node high availability cluster are detected down via a heartbeat check the node that is up takes over (unless it is the one already holding the addresses). There are some details that need to be presented as well: The compute nodes are on the same logical but different physical networks and communicate via a switch. There is a cisco global site selector in front of the compute nodes. The compute nodes are running a recent version of Red Hat Linux. The link for this article located at systhread.net is no longer available. . Managing network address transitions in high availability clusters on Red Hat can be challenging; a combination of strategies is essential for success. Network Address, High Availability, Red Hat, Nmap, Troubleshooting. . Anthony Pell
Today, it's hard to imagine an organization operating without taking advantage of the vast resources and opportunities that the Internet provides. The Internet's role has become so significant that no organization can afford to have its Net connection going down for too long. Consequently, most organizations have some form of a secondary or backup connection ready (such as a leased line) in case their primary Net connection fails. . However, the process of switching over from the primary to the backup connection, if done manually by the system administrator, can take some time, depending upon how ready the backup setup is and on the availability of the administrator at the right moment. The process can even become a costly affair if the organization must buy dedicated routers for the purpose of automatic switchover. But there is an easy and cost-effective alternative -- setting up a Linux failover router. The link for this article located at Linux.com is no longer available. . Setting up a Linux failover router ensures uninterrupted connectivity and enhances network reliability. Follow these steps to build an effective failover system. Linux Failover Router, Network Redundancy, Backup Connectivity, Network Solutions. . Benjamin D. Thomas
The Linux-based devices, which will cost $995 to $9,995 depending upon the number of users licensed, will compete most directly with virtual-private networks (VPNs) and hosted applications, such Citrix's GoToMyPC. . . .. The Linux-based devices, which will cost $995 to $9,995 depending upon the number of users licensed, will compete most directly with virtual-private networks (VPNs) and hosted applications, such Citrix's GoToMyPC. The prices between the competing products differ sharply. An enKoo device with a 25-user license is already being advertised by online retailers for $1,495. A 25-user license for the basic GoToMyPC, which also enables access to applications via a Web browser, costs $3,285. VPNs, which enable remote access by creating private data "tunnels" over the public Internet, are typically sold to small businesses in the form of thin servers or routers that vary widely in their sophistication and range in price from a few hundred to a few thousand dollars. The link for this article located at InternetWeek is no longer available. . Investigate budget-friendly Linux-enabled gadgets that provide safe remote connectivity for users at attractive price points.. Linux-Based, Remote Access, VPN Alternative, Secure Connectivity, Appliance Pricing. . LinuxSecurity.com Team
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