From: Vinod Lodhi (vinodlodhi@airtelbroadband.in)
Date: Thu Nov 01 2007 - 15:40:28 ART
Thanks Scott for all details you shared. Let me give a shot, probably I will
try now this after my written exam, I'm planning for around 20th Nov... and
I know dynamips is time consuming, but its working great for me..
Will update you for any improvement on this :-)
Kind Regards,
Vinod
Email ID: Vinodku2@cisco.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Scott Vermillion
Sent: Thursday, November 01, 2007 1:24 AM
To: 'Vinod Lodhi'
Cc: ccielab@groupstudy.com
Subject: RE: Help needed on Dynamips: Traffic Analyser and Generator
Hi Vinod,
Glad to help. The Dynamips functionality of bridging emulated router
interfaces out to physical interfaces is apparently based on
libpcap/winpcap, so yes, it does definitely support capture. It's just a
question of how to enable it? From Dynagen, you simply enter 'capture R1
fa0/0 ethernetcapture.cap' or something similar. On the serial interfaces,
you must specify the encapsulation also ('capture R1 s1/1 serialcapture.cap
hdlc' or 'capture R1 s1/0 framecapture.cap fr'). To turn it off, you only
specify the router and the interface w/ 'no capture R1 fa0/0'. Note:
forgetting this last part and trying to do a 'no capture R1 fa0/0
ethernetcapture.cap (usually be doing up arrow, backspace, and adding 'no'
to the beginning) has occasionally led to a most unfortunate crash of
Dynagen (Dynamips remains up and running and I can save/finish my work, but
I can no longer interact with my test environment via the Dynagen CLI). So
if you switch to Dynagen, be careful to enter the 'no' form correctly.
So I guess it's just a question of whether or not the GUI version has some
mechanism to enable and disable the capture in Dynamips, which is an answer
I don't have, unfortunately.
Regards,
Scott
-----Original Message-----
From: Vinod Lodhi [mailto:vinodlodhi@airtelbroadband.in]
Sent: Wednesday, October 31, 2007 1:41 PM
To: 'Scott Vermillion'; 'groupstudy'
Subject: RE: Help needed on Dynamips: Traffic Analyser and Generator
Thank you Scott for your reply.
I heard of it that Dynamips support traffic analyser not sure if on Dynagen
or at DynamipsGUI.
You very well said that traffic generator can be achieved by changing the
ICMP packet size.
I appreciate your reply.
Thanks!!
Vinod
-----Original Message-----
From: Scott Vermillion [mailto:scott_ccie_list@it-ag.com]
Sent: Wednesday, October 31, 2007 1:52 AM
To: 'Vinod Lodhi'; 'groupstudy'
Subject: RE: Help needed on Dynamips: Traffic Analyser and Generator
Hi,
Is capture supported by the GUI? I've tried that in the past but really
didn't find it very useful (it'll get a very basic config up but it hinders
you from doing advanced stuff such as, well, capture). Normally capture is
initiated and terminated from the Dynagen CLI.
As for traffic generation, that's not really a feature of Dynamips. You can
do the Brian Dennis trick of setting your ping timeout to zero and crank out
some pretty heavy ICMP traffic (I recently pegged a 6504's CPU to just shy
of 100% with that little gem!). Also there are some multicast tricks. But
if you just want to do an iperf kind of thing, you'll need to accommodate
that in your VM or physical setup somehow.
Regards,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Vinod Lodhi
Sent: Tuesday, October 30, 2007 1:04 PM
To: 'groupstudy'
Subject: Help needed on Dynamips: Traffic Analyser and Generator
Hi All,
I'm using Dynamips for CCIE preparation. I wanted to analyse the traffic
thru 'Ethreal' for setup running on DynamipsGUI 2.8 and also if I can you
some traffic generator also to generate traffic. I appreciate any help.
Thanks in advance.
Thanks!!
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:27 ART