dynamips basic:ccie say dynamips
DynamipsPosted by r0ckwell on August 10th, 2006
A few weeks ago before my 1st Security Lab attempt, I stumbled upon a Cisco 7200 simulator called Dynamips. I basically perused the website to see what it was all about. I didn’t seriously start looking into the emulator until after my failed attempt. The reason being is because I didn’t want to lose focus on my security studies. Now that my failed attempt is behind me, I reinvested some time in using the emulator. Believe me when I say this, you will never have to purchase any routers again using this emulator. It pretty much does everything you want. Once I got the basics down in using Dynamips, I was able to redefine my IPExpert R&S labs, InternetworkExpert R&S Core labs, and my Trinet Security labs using this emulator. While you have to run the frame-relay emulator within Dynamips, all your frame-relay mappings work with ANSI configured as default.
At work, I have an HP xw4300 Workstation with a Pentium 4 CPU of 3.00Ghz and 1GB of RAM running Windows XP. I have read several posts that people were running more than 8 routers within their emulator, but not quite sharing how they acheived this. I had to do a little digging around, but found that they were using Dynagen, a front-end application written specifically for the Dynamips emulator. After tweaking the template files that come with Dynagen, I managed to figure a way to run 11 routers, 2 switches, and 1 frame-relay switch. Just to give you an idea of what I’m talking about, here’s my Dynagen config:
autostart = false
[localhost]
[[7200]]
# In order to speed up the process, I had to download the Cygwin utilities to utilize unzip. Run the following command:
# unzip -p c7200-g6ik8s-mz.124-2.T1.bin > image.bin
# This will decompress the IOS image, so your emulated routers will start much faster.
# In linux, you’ll want to run the following: file image.bin
image = \Windows\Temp\image.bin
# I found this command within the Dynamips blog. Basically without this command, the emulator will run all 11 routers,
# but extremely slow. Adding this speeds up the process.
idlepc = 0×60671480
npe = npe-400
ram = 96
nvram = 192
confreg = 0×2102
midplane = std
## If you only have 1GB of RAM, this will run the routers off your disk instead of eating up your memory.
mmap = true
clock = 10
[[FRSW FR]]
4:403 = 3:304
4:405 = 5:504
1:102 = 2:201
[[ROUTER R1]]
f0/0 = SW1 1
s1/0 = FR 1
[[ROUTER R2]]
f0/0 = SW1 2
s1/0 = FR 2
[[ROUTER R3]]
f0/0 = SW1 3
s1/0 = FR 3
f2/0 = SW2 3
[[ROUTER R4]]
f0/0 = SW1 4
s1/0 = FR 4
s1/1 = R5 s1/1
[[ROUTER R5]]
f0/0 = SW1 5
f2/0 = SW2 5
s1/0 = FR 5
[[ROUTER R6]]
f0/0 = SW1 6
s1/0 = BB1 s1/0
[[ROUTER BB1]]
[[ROUTER BB2]]
slot1 = PA-8T
f2/0 = SW2 8
[[ROUTER BB3]]
f0/0 = SW1 9
slot1 = PA-8T
[[ROUTER SW1R]]
f0/0 = SW1 10
f2/0 = SW2 10
[[ROUTER SW2R]]
f0/0 = SW1 11
f2/0 = SW2 11
[[ETHSW SW1]]
1 = access 10
2 = access 23
3 = access 23
4 = access 43
5 = access 58
6 = access 67
9 = access 43
10 = access 67
11 = access 58
[[ETHSW SW2]]
3 = access 32
5 = access 5
8 = access 32
10 = access 78
11 = access 78
You’ll have to learn the intricacies of each line on your own, but hopefully you get the idea. If anyone happens to come up with more efficient ways of running these 2 programs, I’d appreciate it if you shared them with me.
If you are wondering, I have tested Dynamips and Dynagen in several versions of linux (i.e. Ubuntu, xubuntu, and CentOS). You really don’t have to tweak any of the configuration up above. The default file that Dynagen comes with is sufficient enough.
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