PCAP file creation with Shell script

Avan1729 · 01-12-2012, 02:45 PM

I would want to create ARP,STP,OSPF,RIP, BGP and similar packets with a shell script , Please give me some inputs on how to create it ?

T3RM1NVT0R · 01-12-2012, 02:50 PM

Hi Avan1729,

What you mean by you want to create ARP,STP,OSPF,RIP, BGP and similar packets with a shell script? Could you please elaborate.

Do you have a sample/draft script already in place? If yes, please share with us.

Avan1729 · 01-13-2012, 01:38 AM

Hi T3RM1NVT0R ,

I am working on a script with which I can simulate traffic in an office network . I have a PCAP file which is a capture on a Router Port , I intend to make changes in the IP address and MAC address of this PCAP file and add new kinds of packets like route update packets and Keepalives for routing protocols , UDP packets for VOIP traffic . Populate MAC and ARP entries for addresses which do not exist in my network (Lab network).The reason being I am using a smaller set up in my lab as compared to the office network and I am trying to simulate certain failure scenarios in my lab network .

I do not have a sample draft or script , I am still looking for Idea's to begin with this project . I know that I can do this PERL but unfortunately I am not familiar with PERL .

Let me know if further details are needed .

Thanks
Avan

TB0ne · 01-13-2012, 11:25 AM

Quote:

Originally Posted by Avan1729

Hi T3RM1NVT0R ,
I am working on a script with which I can simulate traffic in an office network . I have a PCAP file which is a capture on a Router Port , I intend to make changes in the IP address and MAC address of this PCAP file and add new kinds of packets like route update packets and Keepalives for routing protocols , UDP packets for VOIP traffic . Populate MAC and ARP entries for addresses which do not exist in my network (Lab network).The reason being I am using a smaller set up in my lab as compared to the office network and I am trying to simulate certain failure scenarios in my lab network .

I do not have a sample draft or script , I am still looking for Idea's to begin with this project . I know that I can do this PERL but unfortunately I am not familiar with PERL .

I'm a bit confused. You say this is for a lab environment, which to me would indicate you're learning/experimenting. Wouldn't also learning Perl to accomplish your task be a good thing???

T3RM1NVT0R · 01-13-2012, 02:36 PM

I am finding it bit difficult to understand the objective. Let me break it down and see if I am getting it correct.

Quote:

I am working on a script with which I can simulate traffic in an office network . I have a PCAP file which is a capture on a Router Port

So you have got a packet trace file (PCAP file) which was a result of the trace that has been ran on one of the interface on your office router. Is this correct?

Quote:

I intend to make changes in the IP address and MAC address of this PCAP file and add new kinds of packets like route update packets and Keepalives for routing protocols , UDP packets for VOIP traffic

You want to edit this packet capture file so that it can reflect the MAC address and IP address that are in use in your lab environment. Is this correct?

The point I am not getting how you will going to use this PCAP file to experiment around. I mean it is just a trace and you can refer it to setup your environment. How you will use this to test your lab environment (which resemble a little with your office environment)?

Basically I am trying to understand your objective behind doing all this. What outcome your are expecting and what raw material you already have.

You said that you know that this can be done in perl. Did you read any link which explains this can be done in perl?