niksu
commented
8 years ago Thanks for flagging this up, it's really useful to track such things and their reproducibility. Could you also indicate which version of iperf you're using please, and what it's running on (Linux distro and kernel version), and the version of SharpPcap and what it's running on (Mono runtime version). I wonder if SharpPcap is raising this exception itself, or if it's raising it on behalf of libpcap, over which it wraps.
On 2016-07-19 18:32, TMVector wrote:
When testing TCP throughput with iperf, I came across a SharpPcap error resulting from large packets.
SharpPcap.PcapException: Can't send packet: send: Message too long
The size of packets sent by iperf can be controlled with the -M option. E.g. iperf -c
-M 700 The actual size of the packets seems to be related to the value specified with -M, M, by 2M+42. So using a value of 736 should yield a packet size of 1514B, which works. Using a value of 737 breaks it. Sometimes a large packet is still received, but I couldn't create steps to reproduce it.
STEPS TO REPRODUCE:
Run the Pax NAT implementation on the middle node On the 'server': iperf -s On the 'client': iperf -c
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TMVector
When testing TCP throughput with
iperf, I came across a SharpPcap error resulting from large packets.The size of packets sent by
iperfcan be controlled with the-Moption. E.g.iperf -c <ip> -M 700The actual size of the packets seems to be related to the value specified with-M, M, by 2M+42. So using a value of 736 should yield a packet size of 1514B, which works. Using a value of 737 breaks it.Sometimes a large packet is still received, but I couldn't create steps to reproduce it.
Steps to reproduce:
Run the Pax NAT implementation on the middle node On the 'server':
iperf -sOn the 'client':iperf -c <IP_OF_SERVER>