Mailing List for the Bandwidth Testing Tool Iperf

Jon Dugan | 11 Oct 2011 01:17

Re: Option to auto stop UDP traffic when network goes down

Excerpts from Shashank Khanvilkar's message of Mon Oct 10 16:43:16 -0500 2011:
> Hello,
> Thanks for any response in advance.
> 
> I would like to know if iperf supports (or planning to support) any
> mechanism where the sender will automatically detect (using some sort of
> keep-alives, say) that the network is down and stop pumping in UDP traffic.
> Let me know if something like this exists.

Well it depends on what you mean.  If the far end host goes down or is
partitioned from the network (it becomes unreachable fro some reason) Iperf
will exit due to the conventional mechanics of using the sockets interface.

For example:  (192.168.1.1 is not reachable from my test host.)

$ iperf -u -c 192.168.1.1
------------------------------------------------------------
Client connecting to 192.168.1.1, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 9.00 KByte (default)
------------------------------------------------------------
[  3] local 198.124.252.117 port 59240 connected with 192.168.1.1 port 5001
write2 failed: No route to host
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 0.0 sec  1.44 KBytes  1.04 Mbits/sec
[  3] Sent 1 datagrams
read failed: No route to host
[  3] WARNING: did not receive ack of last datagram after 1 tries.

The important bit above is:  "write2 failed: No route to host"

(Continue reading)

headers

Gary Gatten | 11 Oct 2011 02:38

Re: Option to auto stop UDP traffic when network goes down

It depends where the failure occurs.  I send udp packets to non existent hosts/IP's all the time and iperf
doesn't care.  If the failure is on the iperf host itself it will prolly care

----- Original Message -----
From: Jon Dugan [mailto:jdugan@...]
Sent: Monday, October 10, 2011 06:17 PM
To: iperf-users <iperf-users@...>
Subject: Re: [Iperf-users] Option to auto stop UDP traffic when network goes	down

Excerpts from Shashank Khanvilkar's message of Mon Oct 10 16:43:16 -0500 2011:
> Hello,
> Thanks for any response in advance.
> 
> I would like to know if iperf supports (or planning to support) any
> mechanism where the sender will automatically detect (using some sort of
> keep-alives, say) that the network is down and stop pumping in UDP traffic.
> Let me know if something like this exists.

Well it depends on what you mean.  If the far end host goes down or is
partitioned from the network (it becomes unreachable fro some reason) Iperf
will exit due to the conventional mechanics of using the sockets interface.

For example:  (192.168.1.1 is not reachable from my test host.)

$ iperf -u -c 192.168.1.1
------------------------------------------------------------
Client connecting to 192.168.1.1, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 9.00 KByte (default)
------------------------------------------------------------

(Continue reading)

headers

Jon Dugan | 11 Oct 2011 04:14

Re: Option to auto stop UDP traffic when network goes down

Excerpts from Gary Gatten's message of Mon Oct 10 19:38:50 -0500 2011:
> It depends where the failure occurs.  I send udp packets to non existent hosts/IP's all the time and iperf
doesn't care.  If the failure is on the iperf host itself it will prolly care

I do that all of the time as well, so I should have been more clear.

If Iperf receives ICMP notifications that there is an error at the far end it
will exit.  This is a somewhat big 'if' as it depends on ICMP not being
filtered and on the network being properly configured.  

Jon

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