An access list is a sequential list consisting of at least one permit statement and possibly one or more deny statements that apply to IP addresses and possibly upper-layer IP protocols. Time-based ACLs is a Cisco feature introduced in the Release 12.0.1.T to allow access control based on time. The time range, identified by a name, can be ‘absolute‘ or ‘periodic‘. Use time-based access list is easy and can be useful in some situations. To implement it, you need: Define time-range Define ACL, where the time-range is applied to Apply ACL; for istance: to the interface, to the vty, to [...]

The Cisco® Annual Security Report provides an overview of the combined security intelligence of the entire Cisco organization. The report encompasses threat information and trends collected between January and December 2010. It also provides a snapshot of the state of security for that period, with special attention paid to key security trends expected for 2011. In response to the last decade of cyber-exploits targeting PC operating systems, PC platform and application vendors have shored up security in their products and taken a more aggressive approach to patching vulnerabilities. As a result, scammers are finding it harder to exploit platforms that [...]

Fortune magazine released its annual “100 Best Companies to Work For” list and Cisco was awarded the No. 20 spot on the overall list, and No. 5 in the large companies category. What makes it so great? “It’s no wonder the networking giant has one of the highest percentages of telecommuters: 85% of employees regularly work from home or on the road. But high pay and an array of perks are why 47% of new hires are referred by employees.” Below the “100 Best Companies“: Rank Company 1 SAS 2 Boston Consulting Group 3 Wegmans Food Markets 4 Google 5 [...]

Traceroute is a tool for measuring the route path and transit times of packets across an Internet Protocol (IP) network. Traceroute sends a sequence of Internet Control Message Protocol (ICMP) packets addressed to a destination host. Tracing the intermediate routers traversed involves control of the time-to-live (TTL) Internet Protocol parameter. Routers decrement this parameter and discard a packet when the TTL value has reached zero, returning an ICMP error message (ICMP Time Exceeded) to the sender. In a Data Center, it is often required to find a host and the layer2 path. To do it, Cisco has implemented a good [...]