Download IOS Image for RouterIn order to perform CCNA and CCNP hands-on lab exercises, either you need the physical devices or a simulator. Since arranging physical devices, such as Cisco routers and switches is probably not possible for everyone. Fortunately, there are various simulators such as and GNS3 that you can use to perform CCNA/CCNP and other hands-on lab exercises.
In this post, you will get the direct links to for Cisco routers, ASA, switches, and even for Juniper routers.One of the great features of GNS3 simulator is that it allows you to perform real-life hands-on lab exercises. However, you need to download IOS images for GNS3 before you can perform the hands-on lab exercises. Click Below link to download GNS3 images. Tcpdump commandThe tcpdump utility is a command line packet sniffer with many features and options. For a full description, refer to the tcpdump man pages by typing the following command: man tcpdumpRunning the tcpdump utilityFollowing are examples of commands used to run the tcpdump utility: Selecting an Interface or VLANThe tcpdump utility’s interface or -i option accepts only one option. This option may be a numbered interface or a named Virtual Local Area Network (VLAN).To view traffic, use the -i flag as follows: tcpdump -i For example:To view the traffic on a single specific interface: tcpdump -i 2.1To view the traffic on a specific VLAN called internal: tcpdump -i internalTo view the traffic on the management interface: tcpdump -i eth0To view the traffic on all interfaces: tcpdump -i 0.0 Disabling name resolutionBy default, tcpdump attempts to look up IP addresses and use names, rather than numbers, in the output.
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Gns3 Supported Cisco Ios
The GNS3 website and forum is an amazing resource of information, labs and tips, the people on the forum are al there to support each other and help improve the GNS3 and others ability to use it. Here is a link to a post about IOS images.Here's a guide to how Cisco IOS images are named: Please remember that the Cisco IOS image is a copyrighted piece of intellectual property and so you will need to obtain a way of getting them yourself if you don't have a Cisco CCO log in. I therefore cannot suggest you search the internet using sites like, I don't know, Google, for them as that would be wrong, so I won't do that.Here's a link to the main GNS3 website:The guys at GNS3 are always looking for suggestions and peoples feedback and so your contribution on their forum would be very welcome, especially as someone new to it!Good luck!. Mark9586 wrote:On a GNS3 note, last time I used it (about 4 years ago) on both Ubuntu and Windows, it would max the processor out on the PC with just a handful of routers running. Has that been improved?For the CPU uusage, you can right click each different router model, and select 'set idle PC', this calculates the best setting and you should really select the vlaue with a. If a value in the dropdown box doesn't have a., select a value and then do it again.I can easily run 20 routers with about 30% usage on a 8 core AMD Bulldog motherboard..