Cisco Etherchannel Mode

Etherchannel is useful in a scenario which you have need to have additional bandwidth particularly between switches hosting servers; On this page i will provide an example on three (3) Cisco Etherchannel modes Note: All interface need to match the following to successfully join the Etherchannel Speed Duplex Medium 3 Cisco Etherchannel Mode Static Cisco …

Controlling ICMP (DDOS) via Cisco Control-Plane

A very simple way of protecting a router from ICMP DDOS attack. ip access-list extended ICMP permit icmp any any ! class-map match-any ICMP match access-group name ICMP ! policy-map ICMP-limit class ICMP police rate 20000 bps conform-action transmit  exceed-action drop  violate-action drop ! control-plane service-policy input ICMP-limit This configuration will limit the icmp traffic …

How to minimize CPU utilization when using Dynamips/GNS3 (idlepc + idlemax)

This is my experiment in minimizing the CPU usage when working on GNS3/Dynamips. On this experiment I have use the Internetwork Expert Topology (INE) Version 5 which has 13 routers and uses 3725 IOS images. If you need the topology just visit INE Website. INE IOS on PC For this experiment I already obtain the …

Installing GNS3 as a portable application (Portable GNS3)

Installing GNS3 as a portable application (Portable GNS3) Step 1.  Download GNS3  Step 2. Install GNS3 Here we didn't install the WinPCap since it would not be installable if your not administrator account on window system 3. Configure GNS3 and Test the Installation As you see Dynamips is not working since it needs 4 DLL …

Cisco Emulator/Simulator

While learning Cisco Technology we need a hand-on configuration training and now a days we are lucky that there are numerous software available to help us. These are the following Dynamips  Cisco Emulator which load a real IOS Front-End GNS3 - Graphical frond-end Dynagen - Text-based front-end IOU/IOL - IOS on Unix Cisco proprietary software …