Comments on: Cisco – Using Dynamips as your personal Internet router

By: Josh

Josh — Wed, 23 Feb 2011 14:48:24 +0000

Hello Amit,

I don’t think there was good reason to not use a single router. Actually, I think it would be good practice for you to do the same thing with a single router.

I was probably testing something else when I made this tutorial.

Josh

By: Amit

Amit — Sat, 19 Feb 2011 23:00:47 +0000

Josh,

Thanks for the terrific tutorials and insight shared by u on practicing NAT using Dynamips.

just wondering… why didn’t we do it with a single router. That would help provide better observations of NAT translations both ways on a single router.

Regards

By: Josh

Josh — Thu, 27 Jan 2011 03:48:10 +0000

Fhatima,

This normally means dynamips is not running.

Josh

By: Fhatima

Fhatima — Wed, 26 Jan 2011 22:53:29 +0000

Hi:
i have this error;

Error: unable to create C7200 instance ‘R1′
see dynamips output for more info

By: sherbban

sherbban — Tue, 27 Apr 2010 19:00:49 +0000

at marc and all the others:

dynamips has to run as root.

By: mmmm_mmmm656

mmmm_mmmm656 — Sat, 22 Aug 2009 22:06:44 +0000

Hello,
I’ve the same problem like (LBS) ….i can’t ping my loopback from the router…is that need a bridge in order to ping or not?????
thx very much

By: marc

marc — Sat, 20 Jun 2009 11:01:53 +0000

Hi…sorry to bother, me again!
I tried using the network device output from XPx64 ( which I run under VMWare) inside the same myfile.net config. Got this output:-

gen_eth_init: unable to open device ‘\Device\NPF_{8AB8ACC3-C0CD-494A-AC8E-1780F8678FB0}’ with PCAP (socket: Operation not permitted)

*** Error: Connecting A f0/0 to NIO_gen_eth:\Device\NPF_{8AB8ACC3-C0CD-494A-AC8E-1780F8678FB0} resulted in
206-unable to create generic ethernet NIO
Shutdown in progress…
Shutdown completed.

It was worth a shot – am not a linux expert, so can’t think what else to do.

Running the myfile.net with
[[ROUTER A]]
f0/0 = LAN 3

everything works, but I need to connect this AMD pc to my latop, to try to lab something.

Any help greatly appreciated, since I’m all out of ideas. I DON’T want to rebuild my Ubuntu box!
LOL

By: marc

marc — Sat, 20 Jun 2009 10:51:23 +0000

Thanks for some very useful info.
Having difficulty with bridging the router fa0/0 to PC (AMD64 running Ubuntu8.04) using all your steps, as per your video. tap0 is there, I can see it!
Ran dynagen myfile.net
Output:
netio_tap_create: unable to open TAP device tap0 (Permission denied)

*** Error: Connecting A f0/0 to NIO_tap:tap0 resulted in
206-unable to create TAP NIO
Shutdown in progress…
Shutdown completed.

Running as sudo doesn’t help either.
I KNOW I’m close to getting this thing running!
Could you help please?

By: Muhammad Ali

Muhammad Ali — Sun, 07 Jun 2009 16:49:56 +0000

for all those who can ping google.com or any public address from R2 and can’t do from R1, the really the problem is due to that R1 uses private addresses and send it to the internet although R2 is directly connected to the real router network, and the real router (which may be D-link) supports NAT translation only for the 192.168.1.0 or whatever network in your home, hence as a result R2 don’t find any prbolem to connect to DNS server or to any internet public address, to solve this problem -thank you Josh first for these labs, my regards- you can watch “How to Configure NAT on your dynamips router” vedio form Linux category, usually windows users don’t watch this vedio to not confilict with linux paramters, although this vedio is valid for both windows & linux and I hope that Josh put it separate from the linux category, bcz this conflicts me myself as a windows user, thank you josh again

By: Anonyme

Anonyme — Fri, 27 Mar 2009 14:13:49 +0000

I\’m love this great website. Many thanks guy+