Re: [RGSPAM] Re: Semi-OT: Re-inject tcpdump captured traffic

[Martin Roesch <roesch () sourcefire com>]

I just tried this and it worked.

1) log some ping packets:

daemonlogger -i en0 -c 20 icmp

2) replay the packets

daemonlogger -R daemonlogger.pcap.1196963946 -o en0

3) run tcpdump to capture and compare the output

tcpdump -nvi en0 icmp

What kind of interface is vr0 (what link type)?


On Dec 6, 2007, at 12:22 PM, Jordi Espasa Clofent wrote:

> > You might want to check out DaemonLogger, it's got a replay mode as  
> > well
> > as a real-time tap mode as well as being a packet logger itself.
> > Basically, DaemonLogger can capture traffic off of one interface  
> > direct
> > to the disk (logger mode), retransmit it out another interface in
> > real-time (tap mode) or replay a pcap file (replay mode).
> >
> > You can get it at
> > http://www.snort.org/users/roesch/Site/Daemonlogger/ 
> > Daemonlogger.html.
>
> Very great tool Martin!
> I cannot understand exactly the way to do what I want. I've tried it  
> in
> my own personal computer at home (with only 1 NIC, vr0).
>
> 1) Sniffing the traffic in very big chunks of time/data (1GB)
>
> $ daemonlogger -i vr0 -c 1000000000
>
> 2. Replay the traffic on the same NIC
>
> $ daemonlogger -R daemonlogger.pcap.1196961141 -o vr0
>
> To check the re-injection process I quit the ethernet wire and  
> launch a
> tcpdump instance at the same time I lauch the step number 2; I think  
> the
> tcpdump should show traffic, so it's completely localhost traffic.
>
> $ tcpdump -i vr0 -v
>
> ...but no traffic is showed.
>
> ¿It means that the re-injection process is incorrect?
> ¿How to do it?
>
> -- 
> Thanks
> Jordi Espasa Clofent
>
>
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--
Martin Roesch - Founder/CTO, Sourcefire Inc. - +1-410-290-1616
Sourcefire - Security for the Real World - http://www.sourcefire.com
Snort: Open Source IDP - http://www.snort.org



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