I should also add that specifically I tried using tcpprep to assign all
traffic from "08:00:27:e6:18:86" as 'server' with the -e switch, then ran
tcpreplay with the cache file to no avail.
Thanks,
Andy
On Thu, Sep 27, 2012 at 5:35 PM, cwl <cwl...@gmail.com> wrote:
> Hi Guys,
>
> Having some trouble getting a simple multicast transmission replayed.
>
> Here is the scenario(eth0 == 10.0.2.15), all on the same host:
>
> 1. I start tcpdump with:
> tcpdump -i eth0 -s0 udp dst port 1111 -w mdump2.pcap
>
> 2. I start my multicast subscribing app:
> ./mdump 224.192.16.1 1111 10.0.2.15
>
> 3. I start the sender:
> ./msend 224.192.16.1 1111 10 10.0.2.15
>
> This works fine.
>
> Then I try to replay the setup with tcpreplay:
>
> 1. tcpdump -i eth0 -s0 udp dst port 1111 -w tcpreplay.pcap
> 2. ./mdump 224.192.16.1 1111 10.0.2.15
> 3. tcpreplay -i eth0 /tmp/mdump2.pcap
>
>
> The network setup is identical(tcpreplay just taking the place of msend),
> I played around with tcpprep & tcprewrite I couldn't see anything I would
> need to do. The correct source/dest MAC addresses show up in the capture.
>
> I don't see any errors/drops in /var/log/messages, or netstat -u. Although
> the packets from tcpreplay are showing up in tcpdump, they do not increase
> the packet count of netstat -s.
>
> I have compared the msend capture vs the tcpreplay capture, and they are
> virtually identical, I am really stumped. I am sure it something simple.
>
> Details
> ----------
>
> root@andy-VirtualBox:/tmp/mtools# tcpreplay -V
> tcpreplay version: 3.4.3 (build 2375)
> Copyright 2001-2009 by Aaron Turner <aturner at synfin dot net>
> Cache file supported: 04
> Not compiled with libdnet.
> Compiled against libpcap: 1.1.1
> 64 bit packet counters: enabled
> Verbose printing via tcpdump: enabled
> Packet editing: disabled
> Fragroute engine: disabled
> Injection method: PF_PACKET send()
>
> This was captured on virtualbox/ubuntu 12, but I have also tried on CentOS
> 6 & RHEL 6 with real hardware and identical results.
>
> I have attached my captures, if there is anything else I can provide
> please let me know.
>
> Any idea's/suggestions would be very we received!
>
> Thanks,
>
> Andrew
>
>
>
>
>
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