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Monthly Archives: January 2012
The Rise of the Hybrid Cloud
As many organizations move their corporate services to private clouds to cut costs, enable rapid provisioning of resources, enable advanced monitoring, and increase up-time, I believe we will see a continuous uptake of solutions which tie private cloud services and … Continue reading
Posted in Business, Technology, Technology, Virtualization and Cloud Computing
Tagged Amazon S3, Amazon Simple Storage Service, American cloud companie, avoid US cloud, avoid US-based cloud, cloud, controversial Patriot Act, hybrid cloud, Jon Stokes, non-US cloud provider, Patriot Act, PATRIOT Act Gives Foreigners Good Reason to Avoid US Cloud, private cloud, public cloud, unconstitutional Patriot Act, United States Patriot Act, VPN
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Cisco – Filtering Unwanted Packets with Standard Access Lists
Access lists (ACLs) are basically statements that packets are compared against for the purpose of taking some action if a match occurs. After an access list is created, it can be applied to inbound or outbound traffic; in some cases … Continue reading
Posted in Cisco, Labs, Networking
Tagged access list, access lists, acess-lists, ACL, ACLs, block host, block ip address, block packet, block traffic, Cisco, Cisco 2611, Cisco 2611 router, deny host, deny ip address, deny packet, deny traffic, extended access list, filter, filter host, filter ip address, filter packet, filter traffic, named access list, router, standard access list, standard access-lists
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Perl – Changing the Input Line Separator and Using the “chomp” Function
In this blog I demonstrate how you can change the input line separator in Perl and use Perl’s “chomp” function. Note, the input line separator is operating system dependent; see the following prior blog of mine where I discuss this … Continue reading
Posted in Perl, Programming Languages, Technology
Tagged $/, $/ system variable, change the input line separator, chomp, chomp function, input line separator, input line separator system variable, input line separator variable, perl, perl input line separator system variable, perl input line separator variable, remove newline, remove newline character
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Perl – Uppercase to Lowercase Conversion via the Translation Operator
Perl’s translation operator provides a way to substitute one group of characters for another. In the below script I demonstrate how easy it is to use the translation operator to convert standard input from the command prompt from uppercase letters … Continue reading
OSPF Explained and Useful Troubleshooting Commands
Open Shortest Path First (OSPF) is an open standard link-state routing protocol that supports multiple equal-cost routes to the same destination (four by default). OSPF constructs a shortest path tree and then updates the routing table with the best paths. … Continue reading
Posted in Cisco, Labs, Networking, Protocols, Technology, Troubleshooting
Tagged ABRs, adjacency, area 0, Area Border Routers, AS, ASBR, Autonomous System, Autonomous System Border Router, backbone area, Backup Designated Router, BDR, Cisco, Cisco 2126XM, Cisco 2126XM router, Cisco IOS, cisco router, cost, Designated Router, Hello packets, Link State Advertisement, LSA, neighbor, Neighbors, Open Shortest Path First, OSPF, OSPF Adjacencies, OSPF area, OSPF Backup Designated Router, OSPF BDR, ospf cost, ospf database, OSPF Designated Router, OSPF Hello Packets, ospf neighbor, OSPF Neighbors, OSPF process, OSPF Router ID, ospf troubleshooting, router, Router ID, Shortest Path First, shortest path tree, SPF
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