Questions tagged [iperf]
128 questions
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iperf udp sequence number wireshark
I'm using iperf for generating udp traffic and my objective is to measure paquet loss. I wanted to know if the first 4 Bytes of Iperf Data are currently the sequence number.
progloverfan
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Debugging slow transfer rate from server
I'm trying to explain this as simple but documented as possible. This is not exclusive to this server or my current ISP. I've seen the same exact issue over the years while being with different ISPs and having my servers with different providers…
Francisco Zarabozo
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Occasional Delay on Website Resources: Packet Loss Due to Bandwidth Cap?
My website loads more slowly than I think it should, due to a few of the assets taking an absurdly long time to download from the server. I've been trying to track down the cause of this. I'm about 95% sure it is a networking issue, not an Apache…
David Alan Hjelle
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4 answers
WARNING: did not receive ack of last datagram after 10 tries
I use iperf to test bandwidth, if i set large test bandwidth, it gives me "WARNING: did not receive ack of last datagram after 10 tries" and there is no report, i want to know what does this mean?
iperf -c xxx -u -b 100m
larry
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Iperf TOS issue on Windows
Hi I tried to execute Qos tests using Windows machine.When send some prioritized traffic usinf -S option it sends only normal data.Registry setting DisableUserTOSSetting is set to 0.
When send TOS data from a linus machine to windows it works fine…
vamsi
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3 answers
Can software traffic generator generate 100 Mbps traffic?
Can software traffic generators like iperf etc can generate 100mbps traffic?
else is there any software generators which can produce such high rates ?
Regards,
Mithun
Vidya
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MPLS Implementation OpenFlow Iperf Testing
I have a mininet topology that consists of two hosts and two ovs switches. h1-eth0 is connected to s1-eth1 and h2-eth0 is connected to s2-eth2 and s1-eth2 and s2-eth1 is also connected. h1 is for client and h2 is for server. In flows, ARP packets…
Sertan Pekel
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Iperf3 on local area network: tcp vs udp
I would like to check quality of a connection on a lan using a cable which is not easy to change neither I have hw tester.
The two pcs have 'standard' windows operating systems and they are not configured a server.
I have installed iperf3 on 2 pcs…
0
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Interpret Iperf3 results for bidirectional UDP Test
I am trying to make sense of the raw logs of an iperf3 UDP bidIrectional test.
Here are the iperf3 client logs:
[ ID][Role] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5][TX-C] 0.00-1.00 sec 1.04 GBytes …
LM10
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1 answer
KVM guest low network speed
I have a KVM guest VM running RHEL 8.7 (12vCPU, 24GB RAM) and a hypervisor with 10Gb NICs.
I'm getting weird results when using iperf3 on my guest machine as a client and a TrueNAS server as a server. See the image:
iperf3 low network speed.
I'm not…
chetzz
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iperf3 test bandwidth : TCP much slower than UDP
I'm trying to find out why one of my servers, used for fileserving, is sending files at a very slow rate, around 7 Mbits/sec, through nginx.
I've been using iperf3 to test transfer rate between servers, both on Debian 11.
FrenchServ : $ iperf3…
Baptiste Placé
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Inconsistent iperf behaviour
I am currently setting up some tests with iperf to add artificial load between two linux servers node0 and node1.
When I run it without any bandwidth specification, iperf goes for the maximum (that is 25Gbits/sec) and we can see that we are quite…
moosehead42
- 101
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1 answer
Getting an iperf "connect failed: connection refused" error on ubuntu when running multiple threads
I have 3 computers hooked up to a local network. I have written a python script to open a dedicated iperf server and an iperf client on separate threads. I want every computer to connect to the other 2 computers and at the same time, accept…
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1 answer
How can I use an iperf output and only grep average Bandwidth?
I am here finding a way to display the average of iperf bandwidth using the script. I am not sure whats wrong with command, i dont get the output of Bandwidth displayed. I need output something like this
average ....... 936.8 Mbits/sec
if [ "$#" -ne…
ls440
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iperf3: error - unable to connect to server: No buffer space available
I am testing usb to ethernet adapters by using iperf. The product I am testing has 12 ports to test, and I have 12 usb to ethernet adapters each having their default ip address.
I am using Test Stand to test these ports. My tests are stable and they…
Theta
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