But as the distance between two hosts increases, the speed of light remains constant. HSR/PRP interface can be setup using a pair of Ethernet interfaces. 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. Of course, it's very unlikely the race would be reproducible within the debugger itself. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. A return code for getaddrinfo of 8 is listed in netdb.h as : #define EAI_NONAME 8 /* Name or service not known */. Regarding the --raw, it has the same functionality as -j. If the problem is still not resolved despite of applying the workarounds above: Try to remove http:// part from the url in your telnet command as shown below: Go to etc/hosts.save check your hostname there. Packet ID (4/8 bytes) So I'm 100% sure that data is being sent by the interface that I want, not the one that the routing table is configured to send. Other people recommend using a LAN address, 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. This is not an environment that we officially support or have much experience with. I still don't know how the --raw payload is being created and I think the current cli proposal is incomplete. Note: Iperf isn't related to wireshark and there shouldn't be any coupling. On latest build using -c with %dev prints something, but it's not working either. Supporting L2 (raw socket) transport in iperf2/iperf3, http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Industrial_Protocols_HSR_PRP.html#linux-software. Loopback addresses are always of the form 127.B.C.D; Are you going to do that? uint32_t id2; Stream ID(4 bytes) Why are lights very bright in most passenger trains, especially at night? This is great! Each test runs for 10 seconds by default, but virtually every setting is adjustable. We use iPerf 2.0.13 on Windows (Server 2019) and Linux (Ubuntu 20.04). How to correctly set hostname and domain name? Reload to refresh your session. 4. such as DNS or NIS (or maybe ActiveDirectory? That is the nature of race conditions. We will never get 100% out of any link. inet 10.2.7.4/24 brd 10.2.7.255 scope global eth2 On Linux, we get: "error: Name or service not known" no matter what "dev" name we try. Well occasionally send you account related emails. Here is a session from the server when the problem happened : Here is the corresponding session from the client side : I just tried with UDP, and I was able to reproduce it too. A short description of the changes to the command line and to output might be useful before sending patches. For signature, we were thinking more along the lines of a unique 4-byte identifier. If you would like to refer to this comment somewhere else in this project, copy and paste the following link: 2023 Slashdot Media. That doesn't make sense,right? Now I'm running iperf3 on two machine. The reason being Grid applications based on iec61850 directly opens raw socket and send Ethernet frames. Discussions. Murali Gandluru, .cls-1 { 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. Just an idea. I'd love to see what they have in common, in particular the hardware configuration. Datagrams It's an active traffic generator in that it sources and sinks its own network i/o traffic. I checked the hostname's IP and it worked System registration fails with "Name or service not known" Have a question about this project? Can you explain? I wouldn't rely on a src MAC address for stream uniqueness. Use commands like ifconfig and hostname-I This may be a long pull request if I have to patch every single place. From that conclusion, we focused on tweaking TCP to get the most out of the network. # service network restart For a system registered with RHSM: Correct Server hostname and Server prefix entries in /etc/rhsm/rhsm.conf file as below: Raw [server] # Server hostname: hostname = subscription.rhn.redhat.com # Server prefix: prefix = /subscription what IP address you should associate with your host name. Thanks for contributing an answer to Stack Overflow! identifies unique stream from a client. the ultimate solution is to add your host to that service. Connect and share knowledge within a single location that is structured and easy to search. b------------------------------------------------------------ It is very frequent, more than half the time. From what I understand, this is expected to be mDNS traffic. Some interesting articles on these protocols are given below. Destination Gateway Genmask Flags MSS Window irtt Iface 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. 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? !, Unfortunately due to our current tools + setup testing the -B % involves the Windows version, and I can't compile it because I'm not a developer and I don't have the resources, but I'll find somebody that can lend me a hand tomorrow!. iperf3 as well in the future. 1 .18 iperf3: error - unable to start listener for connections: Cannot assign requested address working example from the vsan adapter I also think the output interface should be set with -c % vs the using the -B. By clicking Sign up for GitHub, you agree to our terms of service and and I see from your post of your hosts file that this is the case. You can quicklydownload iPerf here. 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. Other relevant information (for example, non-default compilers, iPerf3 Server screen(Server IP is 192.168.200.253), iPerf Client Screen. With multiple simultaneous streams, we can fill the pipe close to its maximum usable amount. 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. gai_strerror() returned "Name or service not known" for error 8 . Solving implicit function numerically and plotting the solution against a parameter. It may succeed. Hostnames can indeed have their address change over time. towards the iperf3 mailing list at [email protected] or centos7 [root@www ~]# ping www.baidu.com ping: www.baidu.com: Name or service not known 1 1->->NAT . Why does this Curtiss Kittyhawk have a Question Mark in its squadron code? Here's the packet structure we're proposing: Source MAC (6 bytes) One of the issue that I faced is the lack of tool support to measure performance over raw socket over Ethernet (Not UDP/TCP as is currently supported in iperf2/3). Yum Install Iperf3 3.17 with lksctp-tools-devel did not enable SCTP for me. socket.gaierror: [Errno -2] Name or service not known - Python Forum iperf 3.7. HSR is a redundancy protocol that operates at Layer 2. Now to use SCTP in iperf these are the proper syntaxes. Each OS is different and the default values will vary, but most all operating systems allow tweaking of the TCP stack and/or using parallel data streams. The problem seems prevalent whenever there is more than one socket indeed, not just with --bidir . This makes it even more curious. Joining multicast (,G)=,239.1.1.2 w/iface eth0 NOTE: The iperf3 issue tracker is for registering bugs, enhancement (and, if you're using DHCP with DNS, to your account. Thus, the further away the two hosts, the longer it takes for the sender to receive the acknowledgment from the remote host, reducing overall throughput. To learn more, see our tips on writing great answers. 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. 0.0.0.0 10.2.128.1 0.0.0.0 UG 0 0 0 eth0 This is interesting! When activated, it tries to send as much data down your pipe as it can, spitting out transfer statistics as it does. This being said, there is no way to identify Ubuntu 20.04 If is a race condition, it might show up under another OS, too, but of course, it might not, also. The options are chosen to make the same available on On Windows, we get "error: No such host is known." I ruled out cygwin as the root cause of the problem. Here is the client output (Windows side) : Booted up Ubuntu on the same AMD 5950X hardware. the command line. 4: eth2: mtu 1500 qdisc mq state UP group default qlen 1000 Some examples for bpf based fast drops are here. Ian Smalley, Be the first to hear about news, product updates, and innovation from IBM Cloud, Using iPerf to Troubleshoot Speed and Throughput Issues, Troubleshoot speed and throughput issues with iPerf, Support - Download fixes, updates & drivers. Therefore it may be that the problem is somehow caused by the network between the different machines. Actually I was able to find only one: #1201. 1 Answer Sorted by: 1 Your problem is socket.gethostbyname ("DESKTOP-HC36K46") - this should return the ip address associated with that name, but python doesn't do it by itself, all python does is to ask the OS for the address. 1 2 > >> (Page 1 of 2) Muralidharan Karicheri - 2019-04-24 Hi, I work for developing hsr/prp protocol in Linux kernel. which might look like 192.168.C.D (but it can be almost anything) We have some bandwidth available for the raw socket support and want to do this support and send patches to both iperf2 and iperf3. Original Article written by Andrew Tyler. --bidir option randomly fails with "iperf3: error - GitHub A -j is not by my thoughts. requests, or submissions of code. With over 10 pre-installed distros to choose from, the worry-free installation life is here! So, it may not be related. Connect and share knowledge within a single location that is structured and easy to search. https://software.es.net/iperf/. uint32_t stream_id; Julien, regarding the issue was with gethostbyname(), I am not able to find it again. All Rights Reserved. More Thanks for the help about setting the optimization level. 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. I need to use cmsg SO_PKTINFO to get the actual received interface. We would also like to use mmap to map the ring buffer and do zero copy to have better performance and also support for pace timer to control the IPG. Since there was no work planned by anyone, we will start working on this right away and send patches to both iperf2 and iperf3 mailing list once ready. iperf3 on Windows, iOS, or Android. If you get any more, youll begin to saturate the link and incur packet loss. myservice.default.svc.cluster.local names served by an upstream DNS? windows networking tcp ipv4 iperf Share Improve this question Follow asked Sep 5, 2022 at 8:08 Theta 1 Add a comment question Twitter Facebook Your Answer Use the binary in client mode with the --bidir option to hit any remote iperf3 3.10+ server, ie. If this is the problem, then for UDP it can be mitigated by setting the --connect-timeout option. The first problem is that with -c, we can't make the %dev work. I think there is likely some sort of race condition in play here. -t is to specify the communication time duration. Senior Security Cloud Support Engineer, Team Lead. I see gerror is declared as extern int, ie. Some examples for bpf based fast drops are here. I tried as high as --connect-timeout 50000 . ), What are your thoughts on the idea? -i is to specify the interval to show the bandwidth.). In this case, iperf data packets go as a payload of May give additional information that can help. We have a multicast environment that we want to test. Operating system (and distribution, if any): Windows 10 21H2 (client side) . Is it the implementation I'm using that have not implemented this command? h_errno has a value of 1, which is HOST_NOT_FOUND . 3 Answers Sorted by: 31 For error like "java.net.UnknownHostException: [hostname]" The reason is your hostname is not in /etc/hosts, The solution is simple: sudo vim /etc/hosts change the line looks like: I don't know why Windows is not caching the result of the lookup in this case. Ultimately it is the system that will resolve the name to a ip address using its configured method, not python. We've done some support for PF_PACKET sockets in a way to test L2 drivers. 168.63.129.16 10.2.128.1 255.255.255.255 UGH 0 0 0 eth0 To set a new TCP window, you use the-wswitch, and you can set the parallel streams by using-P. Here are the iPerf results from two IBM Cloud file servers: one in Washington, D.C., acting as client, the other in Seattle acting as server: TCP window size: 1.00 MByte (WARNING: requested 1.00 MByte), [ 3] local 10.10.10.10 port 53903 connected with 10.10.10.5 port 5001, [ 3] 0.0- 2.0 sec 25.9 MBytes 109 Mbits/sec, [ 3] 2.0- 4.0 sec 28.5 MBytes 120 Mbits/sec, [ 3] 4.0- 6.0 sec 28.4 MBytes 119 Mbits/sec, [ 3] 6.0- 8.0 sec 28.9 MBytes 121 Mbits/sec, [ 3] 8.0-10.0 sec 28.0 MBytes 117 Mbits/sec, [ 3] 10.0-12.0 sec 29.0 MBytes 122 Mbits/sec, [ 3] 12.0-14.0 sec 28.0 MBytes 117 Mbits/sec, [ 3] 14.0-16.0 sec 29.0 MBytes 122 Mbits/sec, [ 3] 16.0-18.0 sec 27.9 MBytes 117 Mbits/sec, [ 3] 18.0-20.0 sec 29.0 MBytes 122 Mbits/sec, [ 3] 0.0-20.0 sec 283 MBytes 118 Mbits/sec, [ 4] local 10.10.10.5 port 8000 connected with 10.10.10.10 port 53903, [ 4] 0.0- 2.0 sec 25.9 MBytes 109 Mbits/sec, [ 4] 2.0- 4.0 sec 28.6 MBytes 120 Mbits/sec, [ 4] 4.0- 6.0 sec 28.3 MBytes 119 Mbits/sec, [ 4] 6.0- 8.0 sec 28.9 MBytes 121 Mbits/sec, [ 4] 8.0-10.0 sec 28.0 MBytes 117 Mbits/sec, [ 4] 10.0-12.0 sec 29.0 MBytes 121 Mbits/sec, [ 4] 12.0-14.0 sec 28.0 MBytes 117 Mbits/sec, [ 4] 14.0-16.0 sec 29.0 MBytes 122 Mbits/sec, [ 4] 16.0-18.0 sec 28.0 MBytes 117 Mbits/sec, [ 4] 18.0-20.0 sec 29.0 MBytes 121 Mbits/sec, [ 4] 0.0-20.0 sec 283 MBytes 118 Mbits/sec. 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. You switched accounts on another tab or window. Can an open and closed function be neither injective or surjective. Bind a raw Ethernet socket to and initiate a connection over Also, maybe default the ethertype to 88B5 when --raw is set that way it doesn't need to be passed in. In the UDP case it's the source UDP port. However I undestand that iperf3 is actively developed and maintained. Whats so cool about iPerf is that you can test in real time any number of TCP window settingseven using parallel streams. Maybe try using different server port numbers (--port), in case 5201 and some other ports are blocked for some reason. I see that you shut down the firewall system on the client hostdid you do this on the server host as well? At the moment, Windows is the only thing I have installed on this machine. I got error "hostname: Name or service not known" when checking IP of hostname, https://bugzilla.redhat.com/show_bug.cgi?id=319981. ](https://sourceware.org/pipermail/cygwin/2020-November/246869.html) on a Cygwin mailing list. This issue is also not directly related by may be interesting. Finally, might consider installing a bpf as well. Have ideas from programming helped us create new mathematical proofs. We proved out the network and verified bandwidth capacity was not an issue. Can you post the packet structure proposed? So interested to know if there is any work going on to add this support. Are you referring to multiple clients connecting to the same remote server? Setting up php5-gd (5.3.10-1ubuntu3.2) . rev2023.7.5.43524. Having a problem logging in? Share this page on Facebook Why Do I Get the Error "Name or service not known" When I - Each can be done in separate pull requests. (1) To use iperf for SCTP, you must enable the SCTP module in the kernel and recompile it. How frequently does this occur? I used cygwin for the build. I modified the test case to use getaddrinfo, since gethostbyname is deprecated. I am not sure what is a reasonable waiting time, but probably one second (--connect-timeout 1000) or few seconds should be enough. The hsr or prp interface appears like a regular ethernet interface and is transparent to user applications. I'd suggest support for both a dst and src streamid. You switched accounts on another tab or window. We are assuming this is the result of a negative response from CoreDNS, not a timeout or other connection issue to CoreDNS. Other relevant information (for example, non-default compilers, What is the server's version? From examining the code, I believed that each flag needed to have a single letter flag associated with it as well. 10.2.128.0/22 dev eth0 proto kernel scope link src 10.2.128.27 This is what the command string would look like on both ends: Client connecting to 10.10.10.5, TCP port 8000, [ 3] local 10.10.10.10 port 46956 connected with 10.10.10.5 port 8000, [ 3] 0.0- 2.0 sec 6.00 MBytes 25.2 Mbits/sec, [ 3] 2.0- 4.0 sec 7.12 MBytes 29.9 Mbits/sec, [ 3] 4.0- 6.0 sec 7.00 MBytes 29.4 Mbits/sec, [ 3] 6.0- 8.0 sec 7.12 MBytes 29.9 Mbits/sec, [ 3] 8.0-10.0 sec 7.25 MBytes 30.4 Mbits/sec, [ 3] 10.0-12.0 sec 7.00 MBytes 29.4 Mbits/sec, [ 3] 12.0-14.0 sec 7.12 MBytes 29.9 Mbits/sec, [ 3] 14.0-16.0 sec 7.25 MBytes 30.4 Mbits/sec, [ 3] 16.0-18.0 sec 6.88 MBytes 28.8 Mbits/sec, [ 3] 18.0-20.0 sec 7.25 MBytes 30.4 Mbits/sec, [ 3] 0.0-20.0 sec 70.1 MBytes 29.4 Mbits/sec, [852] local 10.10.10.5 port 8000 connected with 10.10.10.10 port 58316, [ 4] 0.0- 2.0 sec 6.05 MBytes 25.4 Mbits/sec, [ 4] 2.0- 4.0 sec 7.19 MBytes 30.1 Mbits/sec, [ 4] 4.0- 6.0 sec 6.94 MBytes 29.1 Mbits/sec, [ 4] 6.0- 8.0 sec 7.19 MBytes 30.2 Mbits/sec, [ 4] 8.0-10.0 sec 7.19 MBytes 30.1 Mbits/sec, [ 4] 10.0-12.0 sec 6.95 MBytes 29.1 Mbits/sec, [ 4] 12.0-14.0 sec 7.19 MBytes 30.2 Mbits/sec, [ 4] 14.0-16.0 sec 7.19 MBytes 30.2 Mbits/sec, [ 4] 16.0-18.0 sec 6.95 MBytes 29.1 Mbits/sec, [ 4] 18.0-20.0 sec 7.19 MBytes 30.1 Mbits/sec, [ 4] 0.0-20.0 sec 70.1 MBytes 29.4 Mbits/sec. [SOLVED] Ping: google.com: name or service not known / Newbie Corner Comic about an AI that equips its robot soldiers with spears and swords, Lifetime components in phosphorescence decay. Server is a variety of Unix platforms. I only saw it fail on the first iteration, and never subsequent ones. One side runs in a server mode, listening for requests; the other end runs client mode, sending data. streams from each other. Learn more about Stack Overflow the company, and our products. If I use localhost as the hostname, I never see the problem, and the command returns almost instantly As expected due to the use of the pattern() method, these GOOSE packets show up as invalid in Wireshark and would in other packet-sniffing applications due to the random values in the payload. icons, By: 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. As you can see from the tests above, we increased throughput from 29Mb/s with a single stream and the default TCP Window to 824Mb/s using a higher window and parallel streams. I hope it will be merged into the mainline. So. general, ambiguous sense) doesn't know that the name ubuntu14-graphite The text was updated successfully, but these errors were encountered: Thanks for creating this issue. This is indeed strange, but hopefully your evaluation will help solvin the problem, or at least finding a workaround for. and that it's not in your naming service (e.g., DNS or NIS). I like iperf as it consumes less CPU cycle based on my tests. Some people recommend using a loopback address. Raspberry Pi 64-bit Bullseye OS (server side). Linux is a registered trademark of Linus Torvalds. Perhaps like this: The "[ ]" just indicates it's optional and would only be included on client initiation. What are you putting in /etc/hosts? I just tried --connect-timeout in conjunction with UDP (-u). 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). If you can build yourself, here are the places I plan to add initial debug messages (may be just using printf()) tp identify the function where the problem happens: If that will be the case, then it may be possible to detect the exact place where adding some delay can help, at least as a workaround. then the dynamically assigned address(es) One more thing that may help the evaluation is adding the -J option to the command line as it may give more information. That may indicate if the problem is related to setting multiple sockets. I will try to help finding how the issue can be reported to MS. The UDP bandwidth would be sent at bits/sec. Is the executive branch obligated to enforce the Supreme Court's decision on affirmative action? The kernel version must be 2.6 or above. } Ethernet_datagram; Signature identifies iperf stream from other frame types and stream_id First check if it is already enabled or not by running these two commands in the terminal. The server would then need to support a mask, e. g. --raw [/][:] which would allow it to demux mutiple streams using the same Listener thread as well as sum them all in the Reporter thread. Ping issue "Name or service not known" Solution Verified - Updated 2022-06-10T19:10:08+00:00 - English . However, running iperf -c -B does appear to work. 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. Of course, it's very unlikely the race would be reproducible within the debugger itself. Hopefully another Windows user in the community might be able to shed some light on this. The rounting table hasn't changed but iPerf is sending the information over another interface, right? Iperf as designed is a socket tool at the moment, writes() to reads(). You'll have to compile from source. iperf3: error - unable to start listener for conne - VMware UDP buffer size: 208 KByte (default), [ 1] local 10.2.128.77 port 38869 connected with 239.1.1.2 port 10000. Please file a ticket. Even if it will not help solving the core problem, it may at least help to understand the source of problem. iPerfis a simple, open source, command-line, network diagnostic tool that you install on two endpoints which can run on Linux, BSD, or Windows platforms. (The 2nd solution works for me with fedora 20 and kernel 2.6 and above.). A possible ethertype are the experimnental ones of 88B5 and 88B6. b------------------------------------------------------------ Why I failed to compile a sctp program in Linux? Parallel streams! Share this page on LinkedIn bServer listening over raw socket Note that the thread spans several months and the "Next message" is applicable only for the specific month. Is there a way to sync file naming across environments? rev2023.7.5.43524. Can you try running the UDP test with setting this option? Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site How do I distinguish between chords going 'up' and chords going 'down' when writing a harmony? What are the advantages and disadvantages of making types as a first class value? I will retry later. interface, not necessarily over HSR. [SOLVED] Name or service not known / Newbie Corner / Arch Linux Forums chef Network Error: getaddrinfo: Name or service not known 169.254.169.254 10.2.128.1 255.255.255.255 UGH 0 0 0 eth0 (-z is for selecting the SCTP protocol and -s is for server. You switched accounts on another tab or window. 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. I think the iperf client would need to set a unique src streamid so that -P works properly on the server. 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. ? [ ID] Interval Transfer Bandwidth iperf, sctp command not recognized in command-promt We support --raw and -j. hostname: Name or service not known dpkg: error processing ssmtp (--configure): subprocess installed post-installation script returned error exit status 1 Setting up libt1-5 (5.1.2-3.4ubuntu1) . Is there any error reported on the server side? to see what addresses are in use. E-mail this page, Two of the most common network characteristics we look at when investigating network-related concerns are speed and throughput. I have several interfaces. It's probably a version differentiation. Where can I find the file config.h? valid_lft forever preferred_lft forever Having VMs in the background would have slowed down the system. "Name or service not known" error while domain name is surely existing I've tried to compile, but I get: Can you share your config.h? By: I do not see any difference in my setup, compare to other working solutions. 10.2.192.0/22 dev eth1 proto kernel scope link src 10.2.192.50 Wireshark can have iperf disectors but that's about all. Developers use AI tools, they just dont trust them (Ep. Payload. That will be helpful.

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