Comments on: Dynamips basics

By: Ankur

Ankur — Fri, 17 Sep 2010 17:38:46 +0000

Hi Scott,

Nice article, btw is that possible to telnet hypervisor so that I can start/stop a router from remotely. As of now I can be able to access Routers via Terminal server; But if i need to reboot my router then, RDP is the only option for me. It would be better if can telnet to hypervisor and can be able to take control of routers remotely, need your opinion.

Thanks,

By: Introduction to the dynamips hypervisor | xpresslearn.com

Introduction to the dynamips hypervisor | xpresslearn.com — Wed, 30 Jun 2010 18:08:10 +0000

[...] a previous article titled Dynamips basics, we configured a single router lab that communicated with a loopback adapter on the host Operating [...]

By: Munir

Munir — Wed, 11 Nov 2009 08:02:47 +0000

hello sir,
i am using dynamips i read you comments but one of my question is where to create switch.cfg and where i will save it

By: suryantofang

suryantofang — Thu, 16 Apr 2009 11:33:43 +0000

Hi Scott,

Nice article, btw is that possible to emulate wireless lab in dynamips + dynagen ?, need your opinion.

Thanks,

suryantofang

By: Omer

Omer — Tue, 18 Nov 2008 02:32:10 +0000

hi Scott,

need some help accessing switch using dynagen. i am not able to ssh into the S1 switch from dynagen. when i type telnet S1 it wont start putty for my session. but when i telnet into the R1 it starts the putty session. could you please help me starting the switch any help will greatly be appreciated as i am writing CCNA exam in next couple of weeks

By: Chris B.

Chris B. — Thu, 11 Sep 2008 22:01:27 +0000

Hello again Scott,

Scratch the prvious comment (unless you wish to leave it for clarity).
While writing, I thought to myself, “why don’t you just try it ?”. I changed the 127.0.0.1 to 10.10.10.3 in the switch config and voila !! I’m able to ping the loopback at 10.10.10.5.

Thanks for a great beginning with dynamips !

Chris

By: Chris B.

Chris B. — Thu, 11 Sep 2008 21:50:12 +0000

Hello Scott,

My name is Chris and I’m relatively new to this stuff (not IT, dynamips). I’ve tried a few things with GNS3, but want WIC cards while using an NM-16ESW, and finally figured out that GNS3 doesn’t support WICs, so I decided to dig into dynamips directly. After searching around a bit I found your site and I like it. You start from the ground up, but I had to dig around on the web to find a list of dynamips command line switches so I could figue out what the switches in your example do.

At any rate, I followed your configuration for the switch; modified the command line for the IOS image I’m using, and got a router running. Also found a good idlepc value so I could use the router (took awhile to figure out that the idlepc switch uses 2 dashes).

I am unable to ping my loopback adapter and I have a question(s) for you: I don’t see how the Fa 0/0 picked up an IP address in your example. Also, is the switch a virtual device to which you are connecting the router ? If so, what’s the 127.0.0.1 address for ? I think what’s going on is:

router FA0/0 –> (E0) Virt. switch (E1) –> loopback

Is this correct ? If so, doesn’t switch E0 need a ‘real’ IP ?

In my situation, my loopback is configured w/10.10.10.1 and I set Fa 0/0 as 10.10.10.5 (same subnet masks) but it won’t ping.

Any guidance appreciated!

Chris