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Is anyone aware of software (cheap) that can send packets of various sizes and protocols and also attaches sequence number to the packet?

I would like to send these packets from a pc, thru wireless to another pc and look for: lost packets, out of sequence packets
And also the latency of the packets.

Thank you

Not sure if this will do the job or not but worth checking it out. Its free and I use it at times to find out the latency issues. Its called "netcps".
cheers

You might try iperf. It will do some of what you're asking, including sending sequence numbered UDP packets for bandwidth testing. It will measure throughput for TCP and UDP.

http://dast.nlanr.net/Projects/Iperf/

The UDP can be sent at a specified bandwidth, constant rate like VoIP or video, which lets you see at what speed a specific setup falls over.

An example --------

This log is from two Windows PCs, each using the same 802.11g access point.

In the reports below, sending bandwidth was first 14 Mbits/sec, which had only .92% packet loss and throughput of 13.9 Mbits/sec, jitter 2.089 ms.

At 15 Mbits/sec sending bandwidth, 3.1% loss, throughput 14.5 Mbits/sec, jitter 1.172 ms.

At 16 Mbits/sec, 19% loss, throughput 12.6 Mbits/sec, jitter 11.228 ms.
------------------------------------------------------------
[1920] local 172.16.232.128 port 1989 connected with 10.0.1.4 port 5001
[ ID] Interval Transfer Bandwidth
[1920] 0.0-10.0 sec 16.7 MBytes 14.0 Mbits/sec
[1920] Server Report:
[1920] 0.0-10.0 sec 16.5 MBytes 13.9 Mbits/sec 2.089 ms 109/11906 (0.92%)
[1920] Sent 11906 datagrams
------------------------------------------------------------
Client connecting to 10.0.1.4, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 8.00 KByte (default)
------------------------------------------------------------
[1920] local 172.16.232.128 port 1990 connected with 10.0.1.4 port 5001
[ ID] Interval Transfer Bandwidth
[1920] 0.0-10.0 sec 17.9 MBytes 15.0 Mbits/sec
[1920] Server Report:
[1920] 0.0-10.0 sec 17.3 MBytes 14.5 Mbits/sec 1.172 ms 391/12757 (3.1%)
[1920] Sent 12757 datagrams
------------------------------------------------------------
Client connecting to 10.0.1.4, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 8.00 KByte (default)
------------------------------------------------------------
[1920] local 172.16.232.128 port 1991 connected with 10.0.1.4 port 5001
[ ID] Interval Transfer Bandwidth
[1920] 0.0-10.0 sec 19.1 MBytes 16.0 Mbits/sec
[1920] Server Report:
[1920] 0.0-10.3 sec 15.4 MBytes 12.6 Mbits/sec 11.228 ms 2596/13607 (19%)
[1920] Sent 13607 datagrams

If you use a protocol analyzer like OmniPeek or Wireshark at the receiving end (or both ends), you can tell more about what's going on.

Charles Preston

CommView for Wi-Fi (www.tamos.com)

As a comparison with the previous posting on 802.11g throughput, here are some results for 802.11b.

802.11b experiment with iperf

Looking at the reports from iperf, sending UDP at a constant bitrate from one client to another through an access point, 802.11b, the UDP data rate before severe network degradation was 3 Mbits/sec.

At a 3 Mbits/sec sending rate, measured UDP throughput was 3.02 Mbits/sec, with no packet loss.
At a 4 Mbits/sec sending rate, measured UDP throughput was 2.62 Mbits/sec, with 33% packet loss.

The same access point and clients were then set to 802.11g only, and UDP throughput at 9 Mbits/sec had no packet loss. This means the results probably were a WLAN limitation, and not a problem with wireless drivers, busy client computers, etc.

iperf -c 192.168.1.101 -u -b 3m
------------------------------------------------------------
Client connecting to 192.168.1.101, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 8.00 KByte (default)
------------------------------------------------------------
[1920] local 172.16.232.128 port 1295 connected with 192.168.1.101 port 5001
[ ID] Interval Transfer Bandwidth
[1920] 0.0-10.0 sec 3.58 MBytes 3.00 Mbits/sec
[1920] Server Report:
[1920] 0.0-10.0 sec 3.58 MBytes 3.02 Mbits/sec 3.808 ms 0/ 2553 (0%)
[1920] 0.0-10.0 sec 4 datagrams received out-of-order
[1920] Sent 2553 datagrams

iperf -c 192.168.1.101 -u -b 4m
------------------------------------------------------------
Client connecting to 192.168.1.101, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 8.00 KByte (default)
------------------------------------------------------------
[1920] local 172.16.232.128 port 1296 connected with 192.168.1.101 port 5001
[ ID] Interval Transfer Bandwidth
[1920] 0.0-10.0 sec 4.77 MBytes 4.00 Mbits/sec
[1920] Server Report:
[1920] 0.0-10.2 sec 3.19 MBytes 2.62 Mbits/sec 5.961 ms 1125/ 3403 (33%)
[1920] 0.0-10.2 sec 283 datagrams received out-of-order
[1920] Sent 3403 datagrams

Charles Preston