I have a video stream I am attempting to send over UDP. It should
originally have been playing at 3.75Mbps (payload; about 3.88Mbps or
so wire rate.) When I play it back, tcpreplay reports:
# tcpreplay -i eth1 /tmp/replay.pcap
sending out eth1
processing file: /tmp/replay.pcap
Actual: 31823 packets (43215634 bytes) sent in 127.35 seconds
Rated: 339345.4 bps, 2.59 Mbps, 249.89 pps
Statistics for network device: eth1
Attempted packets: 31823
Successful packets: 31823
Failed packets: 0
Retried packets (ENOBUFS): 0
Retried packets (EAGAIN): 0
If I try to force it to a faster speed (I don't know whether the
original stream really was going out at 3.75Mbps), it returns the
"Rated" line showing the same 2.59 Mbps. The three things I tried were
-x 3
-M 3.75
-p 365
all had the same result (2.59Mbps). If I send with -t, I get
# tcpreplay -t -i eth1 /tmp/replay.pcap
sending out eth1
processing file: /tmp/replay.pcap
Actual: 31823 packets (43215634 bytes) sent in 0.51 seconds
Rated: 84736536.0 bps, 646.49 Mbps, 62398.04 pps
Statistics for network device: eth1
Attempted packets: 31823
Successful packets: 31823
Failed packets: 0
Retried packets (ENOBUFS): 0
Retried packets (EAGAIN): 0
The pcap file contains only UDP packets going from 10.220.250.28 (port
0) to 192.168.248.189 port 32800. No other packets are in the file. No
packets have identical timestamps. My pcap file was rewritten with
tcprewrite -i /tmp/watched.pkt -o /tmp/replay.pcap
--enet-dmac=00:02:02:09:65:A5 --enet-smac=52:fe:2b:5f:1a:9e
--pnat=10.220.250.238/32:192.168.248.189/32
# tcpreplay -V
tcpreplay version: 3.4.3 (build 2375)
Copyright 2001-2009 by Aaron Turner <aturner at synfin dot net>
Cache file supported: 04
Compiled against libdnet: 1.11
Compiled against libpcap: 0.9.4
64 bit packet counters: enabled
Verbose printing via tcpdump: enabled
Packet editing: disabled
Fragroute engine: enabled
Injection method: PF_PACKET send()
# rpm -q centos-release
centos-release-5-0.0.el5.centos.2
This is running inside a Xen VM, so the network device is virtual. I'm
not sure what the physical device is. I can dig that up if needed. The
VM can send at 646 Mbps, though.
Packet dump is available at
<http://0xdeadbeef.net/~sfink/uploads/replay.pcap.bz2>. Warning: it's
over a fairly slow uplink. The file is 12MB. (Damn! bzip2 did twice as
well on that file as gzip -9!)
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