GNS3 1.2.1 installation on Ubuntu 14.04

As mentioned in an earlier post GNS3 is moving ahead fast. Currently at version 1.2.1 the GNS3 is looking great. Compared with the version 1.0 Beta 1 which I had installed, the 1.2.1 is not only more stable, but it has the Menu more clean and compact. For example now there is only one Preferences menu where you can adjust all your settings.

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IPsec VPN Mikrotik to Linux

After writing the Mikrotik IPsec VPN article and I got some questions about how Mikrotik will work with a Linux device to build an IPsec VPN. I did notice that the questions were more oriented for a copy / paste solution, so I’ll provide one that it’s working. If you need more details about why the solution is like it this, please let me know.
Also don’t forget to customize the solution as you need.

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New GNS3 1.0 Beta 1

It appears that there are some significant changes ongoing with GNS3:
 

 
As mentioned by the GNS3 CEO and co-founder Stephen Guppy on 11th of August 2014, the new GNS3 will be more polished and will migrate to a multi-vendor emulation platform. For those using this tool, it’s a well known fact that GNS3 was mainly focused to emulate Cisco platform, evolving to support vPC and VirtualBox virtual machines.
 
They have a new very polished website accessible at new.gns3.net where you can also download the GNS3 1.0 Beta 1 software.

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EGP

Today I came across an old Cisco router with original IOS image. Big surprise (at least for me) when I did check what routing protocols are supported on this router:

EGP protocol

I was out of the game, or better not even yet had discover the networking games, when the EGP was still out there and available to be configured on the Cisco routers.

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Cisco STP forward-time command trick

This is more a topic for exams, like Cisco CCIE, but also it can appear in real-world environments.

Consider the following simple topology:
Simple L2 topology

SW1 is the spanning-tree root bridge for all VLANs. Imagine that you have a request which ask you that when a port becomes active, no matter of VLAN, it should wait 10 seconds until it transition to forwarding state.

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