Browse other questions tagged. TI implementation support offload protocol handling to TI' PRU ICSS. On a gigabit link, this about the maximum throughput one could hope to achieve before saturating the link and causing packet loss. Well, maybe the name and address of the CentOS server are entered into the DNS system (or whatever name service is in use). Is this a concern and/or something we should be handling? I'm running Ubuntu 14.04 on my company's cloud service If I use hostnames for other Windows hosts on my LAN, I never see the problem. iperf3: error - unable to connect to server: Connection refused. in your /etc/hosts file, This makes it even more curious. Datagrams Run the client (and preferably also the server) with -V -d options. -c 239.1.1.1 -B 172.4.5.6 Developers use AI tools, they just dont trust them (Ep. Also, maybe default the ethertype to 88B5 when --raw is set that way it doesn't need to be passed in. -t is to specify the communication time duration. How to correctly set hostname and domain name? Draw the initial positions of Mlkky pins in ASCII art. I am aware support can't be provided for Windows, but I still think it's worth filing and tracking the issue here. It's likely something to do with Windows changes Or possibly a race that just didn't show up with 6 cores / 12 threads, but does with 16 cores / 32 threads. I tried as high as --connect-timeout 50000 . @heemayl So by putting 127.0.1.1 ubuntu14-graphite on /etc/hosts then check the IP i didn't get the right IP. Be the first to hear about news, product updates, and innovation from IBM Cloud. regarding iperf3 can be found at http://software.es.net/iperf/faq.html. Yum Install Iperf3 3.17 with lksctp-tools-devel did not enable SCTP for me. questions about building or using iperf3. b------------------------------------------------------------ h_errno has a value of 1, which is HOST_NOT_FOUND . The one in this test was a Raspberry Pi with Realtek 2.5 Gbps USB NIC. and that it's not in your naming service (e.g., DNS or NIS). -c 239.1.1.2%eth0 on 2.0.13 gives (with eth0 or whatever you put on dev): Server listening on UDP port 5001 Ok, now that I've compiled and tried it, but I don't know if it's working. http://www.hirschmann.com/en/Hirschmann_Produkte/Industrial_Ethernet/Technologies/HSR_uE2u80u93_High_Availability_Seamless_Redundancy/index.phtml, TI did extended the HSR driver to include PRP as well and the relevant details are available at Thank you for these binaries. Can I knock myself prone? If you need some sort of sink for a new protocol, that's probably not iperf. I found an old issue about that for gethostbyname(). You can quicklydownload iPerf here. For the purposes of this exercise, lets use those customizations as our baseline. But I've tried on other machines and it went well without the need of changing anything. running on my system with the AMD 5950X CPU machine, which is my primary desktop, trying to resolve one of my Unix LAN hosts. Debug messages can also cause synchronization issues with stdout/stderr, and hide race conditions. That is probably not the right forum, though. Then make 'B' the server and 'A' the client. With over 10 pre-installed distros to choose from, the worry-free installation life is here! First check if it is already enabled or not by running these two commands in the terminal. If you're using a more sophisticated (distributed) naming system Not much info in there except the CPU and Windows 10 build number. [ 9] 0.0- 2.0 sec 24.9 MBytes 104 Mbits/sec, [ 4] 0.0- 2.0 sec 24.9 MBytes 104 Mbits/sec, [ 7] 0.0- 2.0 sec 25.6 MBytes 107 Mbits/sec, [ 8] 0.0- 2.0 sec 24.9 MBytes 104 Mbits/sec, [ 5] 0.0- 2.0 sec 25.8 MBytes 108 Mbits/sec, [ 6] 0.0- 2.0 sec 25.9 MBytes 109 Mbits/sec, [SUM] 0.0- 2.0 sec 178 MBytes 746 Mbits/sec, [ 7] 18.0-20.0 sec 28.2 MBytes 118 Mbits/sec, [ 8] 18.0-20.0 sec 28.8 MBytes 121 Mbits/sec, [ 5] 18.0-20.0 sec 28.0 MBytes 117 Mbits/sec, [ 4] 18.0-20.0 sec 28.0 MBytes 117 Mbits/sec, [ 3] 18.0-20.0 sec 28.9 MBytes 121 Mbits/sec, [ 9] 18.0-20.0 sec 28.8 MBytes 121 Mbits/sec, [ 6] 18.0-20.0 sec 28.9 MBytes 121 Mbits/sec, [SUM] 18.0-20.0 sec 200 MBytes 837 Mbits/sec, [SUM] 0.0-20.0 sec 1.93 GBytes 826 Mbits/sec, [ 4] local 10.10.10.10 port 8000 connected with 10.10.10.5 port 53903, [ 5] 0.0- 2.0 sec 25.7 MBytes 108 Mbits/sec, [ 10] 0.0- 2.0 sec 25.9 MBytes 108 Mbits/sec, [ 7] 0.0- 2.0 sec 25.9 MBytes 109 Mbits/sec, [SUM] 0.0- 2.0 sec 178 MBytes 747 Mbits/sec, [ 4] 18.0-20.0 sec 28.8 MBytes 121 Mbits/sec, [ 5] 18.0-20.0 sec 28.3 MBytes 119 Mbits/sec, [ 7] 18.0-20.0 sec 28.8 MBytes 121 Mbits/sec, [ 10] 18.0-20.0 sec 28.1 MBytes 118 Mbits/sec, [ 9] 18.0-20.0 sec 28.0 MBytes 118 Mbits/sec, [ 6] 18.0-20.0 sec 29.0 MBytes 121 Mbits/sec, [SUM] 18.0-20.0 sec 200 MBytes 838 Mbits/sec, [SUM] 0.0-20.1 sec 1.93 GBytes 825 Mbits/sec. However, the EIP of the ECS can be pinged. 586), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, PSA: Stack Exchange Inc. have announced a network-wide policy for AI content, Unable to ssh into Ubuntu 12.04 LTS [could not resolve hostname (hostname): Name or service not known, service start: HOSTNAME: command not found. I work for developing hsr/prp protocol in Linux kernel. My thoughts are use a colon so it's --raw [:], Also, we did add support for --incr-dstip which is useful for -P. We may want to generalize that here to something like --incr-dst which would increment the destination streamid. re: this issue, do you have any references to those other reports ? I don't think it's in iperf's interest to do add such support. Share this page on LinkedIn Note that depending on the actual cloud setup, the server instance may not be aware of the public IP and only know a VLAN IP. To your shock, you see Time Remaining: 10 Hours.. Do I have to spend any movement to do so? The rounting table hasn't changed but iPerf is sending the information over another interface, right? Is this for windows? Have a question about this project? typedef struct Ethernet_datagram { The old 3.1.3 binaries I used come with the old cygwin DLL, which rules out a cygwin regression as the root cause. Therefore it may be that the problem is somehow caused by the network between the different machines. We use iPerf 2.0.13 on Windows (Server 2019) and Linux (Ubuntu 20.04). iperf -c % For signature, we were thinking more along the lines of a unique 4-byte identifier. I was only able to reproduce the problem about once out of 20 tries. iperf3 on Windows, iOS, or Android. but whatever you put after the % is printed on the third line, but doesn't work at all. Note that the thread spans several months and the "Next message" is applicable only for the specific month. Description of option: Get a copy of iperf which supports lksctp module of linux kernel. rev2023.7.5.43524. (Although I tried with 3.7 server with no problems.). iperf_udp_connect (): before and after the call to netdial (). Re: the network dumps, yes, I will take some. I see gerror is declared as extern int, ie. I used those very same binaries in the past with no issues even with multiple sockets back when I had a slower machine with fewer cores - an Intel i7-5820k. (UPDATE - added 3rd suggestion) Debugging multicast is non trivial. Iperf3 not working: unable to send cookie #22163 - GitHub So what isiPerf, and how does it fit into all of this? Supporting L2 (raw socket) transport in iperf2/iperf3 Why are lights very bright in most passenger trains, especially at night? So. I got the same error, nc is working normal , iperf3 connect refused. This would allow multiple clients to connect to the same server. From that conclusion, we focused on tweaking TCP to get the most out of the network. And the hostname only resolves to an IPv4 address, for some reason. I see that there are a lot of calls to getaddrinfo, as well as corresponding calls to freeaddrinfo . This being said, there is no way to identify Example: To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A short option isn't required so --raw is enought. We have a prototype working for raw Ethernet socket support on iperf2. We proved out the network and verified bandwidth capacity was not an issue. I built the cygwin dll from source, and tried to step through, but it turned out -O2 is applied and some arguments on the stack were still optimized out. If the two machines are 'A' and 'B'. it's a global across source files, which I would say is not best practice, but if there is no multi-threading, it might work OK. Either the implementation of getaddrinfo in cygwin is broken, or there is something else underneath (OS) that is broken here. I created a pull request at #1346 . And when I try iperf -c 239.1.1.2%ens5 -p 10000 -u -t 1200 -l 1000 I get: Client connecting to 239.1.1.2, UDP port 10000 with pid 4610 via ens5 (1 flows) Within the payload, we include a packet ID, timestamp, and a stream ID as in UDP. It uses port 5001 by default, and the bandwidth it displays is from the client to the server. I already shutdown windows firewall and ubuntu firewall with the following command, root@CHANGHEESHIN01-5501I5:/usr/bin# ufw disable Each test runs for 10 seconds by default, but virtually every setting is adjustable. you shouldn't have to change it. Thanks for contributing an answer to Stack Overflow! Well occasionally send you account related emails. Other relevant information (for example, non-default compilers, iPerf3 Server screen(Server IP is 192.168.200.253), iPerf Client Screen. Loopback addresses are always of the form 127.B.C.D; This issue is all too common and it has nothing to do with the network. UnknownHostException: name or service not known [ 3] Server Report: [ 3] 0.0-10.0 sec 99.1 MBytes 83.4 Mbits/sec 0.041 ms 2/70562 Server is a variety of Unix platforms. 0.0.0.0 10.2.128.1 0.0.0.0 UG 0 0 0 eth0 Is there a proper way to do this with autoconf ? To ensure proper delivery of data, it doesnt send more until it receives an acknowledgment from the remote host that all data was received. Thanks for that link. I also think the output interface should be set with -c % vs the using the -B. The default is 1 Mbit/sec. That will be helpful. (The fact that is is your host's name isn't enough to make this happen.) Have a question about this project? valid_lft forever preferred_lft forever When using Windows as a client, the option works erratically, often display the message "iperf3: error - unable to connect stream: No such file or directory", but not every time. _____________ How to install game with dependencies on Linux? In this server Iinstalled CentOS6.7. You convinced me that this there should be a workaround in iperf3. How to get the computer name (not its hostname)? (-z is for selecting the SCTP protocol and -s is for server. While responding to your message, I had 3 VirtualBox VMs running in the background on my Windows desktop. This is great! One interesting thing I see is that I don't see the problem when trying to resolve "homeassistant" which is the hostname of my HAOS installation on a Raspberry Pi 3B+. The logic is quite messy. It also fails . If you would like to refer to this comment somewhere else in this project, copy and paste the following link: 2023 Slashdot Media. There are many, many other parameters you can set that are beyond the scope of this article, but for our purposes, the main use is to prove out our bandwidth. ), (-z for SCTP, -c is for client. I have several interfaces. If I use -c alone, then the packages won't get through the desired interface, so I assume that my routing table is selecting another interface as the preferred output device. valid_lft forever preferred_lft forever. Not sure how many others on the planet are affect by this, but this is a very annoying bug. The traceroute and MTR look finebut wheres the performance and bandwidth youre paying for? Hopefully that will at least allow identifying the exact place where the problem happens. root@CHANGHEESHIN01-5501I5:/usr/bin# ufw status Once I stopped all the background VMs, the frequency of the problem went back to what it was before, failing about 9 out of 10 times. Now to use SCTP in iperf these are the proper syntaxes. addition to the basic Ethernet fields, that can be used to distinguish I'll give it a shot. should be entered into your DNS records automatically). Telnet : Temporary failure in name resolution : Host name lookup failure b[ ID] Interval Transfer Bandwidth Jitter Lost/Total UDP buffer size: 208 KByte (default). In this case, the error never appears. As you can see I used ens5 on purpose. You'll need to install lksctp-tools-devel first and build from source to enable the SCTP support. On 06/03/2019 05:55 PM, Robert McMahon wrote: A short description of the changes to the command line and to output What's it called when a word that starts with a vowel takes the 'n' from 'an' (the indefinite article) and puts it on the word? As you already know, we don't officially support Windows and it is difficult for us to test on it. Please file a ticket. I think there is likely some sort of race condition in play here. We will never get 100% out of any link. To set the client's output interface it's, and to set the server or receive interface it's. Version of iperf3: iperf 3.7 (cJSON 1.5.2), Hardware: Intel CPU > i5-9300, Memory > 16G, Operating system (and distribution, if any): Windows 10 and running Ubuntu 20.04 LTS(WSL 2). b[ 4] 0.0-10.0 sec 1.24 MBytes 1.04 Mbits/sec 0.046 ms 0/ 874 (0%), [ 3] 0.0-10.0 sec 99.1 MBytes 83.1 Mbits/sec. Two machine is possible icmp request and reply without any problem. In the tests below, the client is connected to the server over a HSR 4 comments SHIN-CHANG-HEE commented on Dec 11, 2020 edited Version of iperf3: iperf 3.7 (cJSON 1.5.2) Hardware: Intel CPU > i5-9300, Memory > 16G It was a while back and I don't recall which compiler was used. Now the -c % works!!!! The ./configure should do the right thing. Hi Bob, Please fill out one of the "Bug Report" or "Enhancement Request" If you would like to refer to this comment somewhere else in this project, copy and paste the following link: 2023 Slashdot Media. The current design is iperf servers work with iperf clients and the "test protocol" is between them. Can an open and closed function be neither injective or surjective. What are the advantages and disadvantages of making types as a first class value? It is not a means for asking Firewall stopped and disabled on system startup I thought of taking network dumps as well. But I would probably want to output something about this problem being detected, to see if it can help get it fixed correctly in the right layer. @madbrain76, thanks for the detailed info. I have another server (not cloud instance but physical server). Maybe try using different server port numbers (--port), in case 5201 and some other ports are blocked for some reason. b------------------------------------------------------------ The text was updated successfully, but these errors were encountered: Thanks for creating this issue. b[ 4] 0.0-20.0 sec 2.48 MBytes 1.04 Mbits/sec 0.046 ms 0/ 1748 (0%). iperf3_test_bidir_issue_1314.zip. There is some debate over the question of Stream ID(4 bytes) In my opinion it depends on version of hostname command (net-tools package). iperf3: error - unable to connect to server: Connection refused Of course we don't use UDP headers but we do use Ethernet headers to specify source and destination MAC address as well as an Ethernet type. However I undestand that iperf3 is actively developed and maintained. I was going to send you a new iperf3 version with additional debug messages for the getaddrinfo, as I didn't expect initially that the error may be there. This is the implementation I'm using, can't find any obvious documentation of the SCTP commands related to this. I'm using various remote physical machines as servers. Ethernet frame instead of UDP or TCP transport.. I ran gethostbyname() up to 10 iterations, until it succeeds, and without any delay. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I know Dijkstra considered harmful, but this one case where it really would be much more appropriate, rather than to duplicate the freeaddrinfo call for every failure case. For creating an SCTP server, iperf -z -s requests, or submissions of code. I tried to use a local for the return value of getaddrinfo in this one instance, and that didn't change the behavior. So, I don't know if IPv6 is part of the problem or not. This is called the TCP Window. Data travels at the speed of light, and typically, most hosts are fairly close together. bServer listening over raw socket I should note that there is no SO_BINDTODEVICE with windows. The program returned the failure within just a couple of seconds, though. You switched accounts on another tab or window. Here's a bit of our code showing how our packets are filled in: pattern() is still being called in the same manner in the Client constructor. So we would work to add support there as well. I let the code proceed to the call to getaddrinfo() regardless, and that call never failed. Most SCTP iperf implementations are added manually in the tests and the source code is often not provided. However when I'm trying to use the --sctp command that I've seen people been using it says command not recognizable. Can the -c be a L2 MAC address? In other words, change this line in /etc/nsswitch.conf: Where usually hostnames are resolved using the /etc/hosts file and dns, the hostname of the system can also be resolved by telling the Name Service Switch to do so (as this configuration change will do). One more thing that may help the evaluation is adding the -J option to the command line as it may give more information. Whats wrong with the network? you wonder. Datagrams to your account. the input arguments are identical for the failure or success cases of this API call. iperf UDP server start error, bind failed: Operation not permitted Also things like igmp and mld come into play too. Hi, valid_lft forever preferred_lft forever privacy statement. Note: Iperf isn't related to wireshark and there shouldn't be any coupling. -i is to specify the interval to show the bandwidth.). That would be helpful. My suggestion for our modification is to initiate the raw Ethernet connection on the client-side as follows: We see here that by increasing the TCP window from the default value to 1MB (1024k), we achieved around a 400% increase in throughput over our baseline. I am using the server versions between 3.10 and 3.11 on Raspberry Pi OS 64-bit on my Raspberry Pi 3B+ and 4B, as well as Ubuntu 20.04 on my Odroid XU4, Ubuntu 22.04 on Odroid N2+, Ubuntu 20.04 on my x64 NAS. I don't know why Windows is not caching the result of the lookup in this case. 586), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Testing native, sponsored banner ads on Stack Overflow (starting July 6), Temporary policy: Generative AI (e.g., ChatGPT) is banned. And compile it by enabling SCTP. platforms. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. 2 Answers Sorted by: 0 Get a copy of iperf which supports lksctp module of linux kernel. Do large language models know what they are talking about? (0.0028%), [ 3] local 192.168.0.20 connected with 192.168.0.10 If you don't think the customizable route is best, would there be a specific Ethernet type you'd recommend we use? It would seem that this race condition is specific to Windows. #1 May-23-2019, 07:53 PM Hello, I am new to this forum. On the other hand some programs are still particular about running on specific ports, so in case of a conflict you may still have to assign specific port usage. Support may be provided on a best-effort basis to other UNIX-like the -B address is the source address put in the packet for transmit. I was still able to reproduce the problem. UNIX is a registered trademark of The Open Group. Are MSO formulae expressible as existential SO formulae over arbitrary structures? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. fill:none; I just didn't manage to get autoconf to output the right debug Makefile. Comic about an AI that equips its robot soldiers with spears and swords, Lifetime components in phosphorescence decay. Docker compose - Name or service not known when calling service from A public domain name configured for an ECS fails to be pinged, and the error message "Name or service not known" is displayed. Ping issue "Name or service not known" - Red Hat Customer Portal I'm investigating how to do that. Ok, fixed the bind to device for TCP (it worked for UDP) Tested with v4 and v6. I'll do the test now. This would be easy for a program to do if iperf is running in user-mode instead of daemon mode. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Thanks for the help about setting the optimization level. I want tocheck out the IPaddress of my instance I'm running Having VMs in the background would have slowed down the system. By clicking Sign up for GitHub, you agree to our terms of service and In data transmission, TCP sends a certain amount of data and then pauses. Our concern comes from the possibility of a client having multiple simultaneous connections with the server, only one of which is coming from iperf. On Linux, we get: "error: Name or service not known" no matter what "dev" name we try. 4. Payload. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Have ideas from programming helped us create new mathematical proofs. should be created by ./configure and placed in ./config.h. So we would like to have iperf2/3 extended to send and receive frames and measure throughput. python - Name or service not known - Stack Overflow Already on GitHub? 10.2.192.0 0.0.0.0 255.255.252.0 U 0 0 0 eth1 I will retry later. Timestamp (4/8 bytes) broot@am57xx-evm:~/iperf/src# ./iperf -s -j hsr0, bServer listening over raw socket The Windows 10 OS has gone through updates, though, as has the NIC driver. This is not an environment that we officially support or have much experience with. I uploaded cross compile version for windows here. More Here the communication time is 10 seconds and it'll report the bandwidth for each 2 seconds interval. BUT if I use -c -B , it works as expected because I can receive on that particular network.. [ 3] Sent 70564 datagrams Verb for "Placing undue weight on a specific factor when making a decision". "Name or service not known" error while domain name is surely existing (If it fails, please inform with the error message and the operating system and kernel details). inet 10.2.192.55/22 brd 10.2.195.255 scope global eth1 How would you suggest passing in the src stream id? You signed in with another tab or window. Ultimately it is the system that will resolve the name to a ip address using its configured method, not python. With the use of a custom Ethernet type, we could easily distinguish packets coming from iperf vs packets related to non-iperf transmission in packet sniffing applications by filtering on Ethernet type. I had looked up that error in the cygwin netdb.h previously. Another idea that Murali and I had discussed was adding a flag allowing for customization of ethertype. I can't imagine this is what one ever actually want to happen. Equivalent idiom for "When it rains in [a place], it drips in [another place]", international train travel in Europe for European citizens, Space elevator from Earth to Moon with multiple temporary anchors. Both HSR and PRP protocols are for redundancy by duplicating frames. 168.63.129.16 via 10.2.128.1 dev eth0 proto dhcp src 10.2.128.27 metric 100 Connect and share knowledge within a single location that is structured and easy to search. I just tried --connect-timeout in conjunction with UDP (-u). The documentation does not show that iperf is capable of running with Is it the implementation I'm using that have not implemented this command? Hostnames can indeed have their address change over time. platforms. Everyone agrees that it should be an address that "works" for your host; The text was updated successfully, but these errors were encountered: It looks like you're running iperf3 correctlyat least I do not see any obvious problems. Some people recommend using a loopback address. Is there more information somewhere as I have no expertise in hsr/prp. https://en.wikipedia.org/wiki/High-availability_Seamless_Redundancy. getsockopt "Invalid argument" for IPPROTO_SCTP, SCTP_STATUS, Linux: Error getting socket options for sctp connection, Protocol not available error for scp on Linux. If yes, probably logs should be collected on both machines. Therefore, it may not make any difference in MS priorities if an iperf3 workaround is implemented. At the moment, the raw packet is constructed somewhat similar to the UDP packets. I used cygwin for the build. -c 239.1.1.1%eth0 Reload to refresh your session. We lack this support and thus would like to add this. Perhaps like this: The "[ ]" just indicates it's optional and would only be included on client initiation. the command line. Ping issue "Name or service not known" Solution Verified - Updated 2022-06-10T19:10:08+00:00 - English . I see that you shut down the firewall system on the client hostdid you do this on the server host as well? Using the stream ID, we can distinguish iperf connections from non-iperf connections.