Is there an easier way to generate a multiplication table? Its such a versatile and easy-to-use little piece of software that we think is invaluable. streams from each other. We cannot provide support for building and/or running So we would work to add support there as well. Binding to local address 239.1.1.2 On Windows, we get "error: No such host is known." platforms. Red Hat Enterprise Linux. https://en.wikipedia.org/wiki/High-availability_Seamless_Redundancy. identifies unique stream from a client. Joining multicast (,G)=,239.1.1.2 w/iface eth0 That did the trick! I even tried a fresh install of the OS (Win10 21H2) and reproduced the problem just the same. I'm using a pretty beefy system for the Windows side, a Ryzen 5950X which has 16 cores / 32 threads, so that might make a difference in the reproducibility of the problem. Is the -c address a multicast address? https://software.es.net/iperf/. 4. I just tried --connect-timeout in conjunction with UDP (-u). Name or service not known. Not sure how many others on the planet are affect by this, but this is a very annoying bug. Also, are you cross compiling? On Linux, we get: "error: Name or service not known" no matter what "dev" name we try. b[ 4] local 192.168.0.10 connected with 192.168.0.20 If this is the problem, then for UDP it can be mitigated by setting the --connect-timeout option. do not use port numbers. By clicking Sign up for GitHub, you agree to our terms of service and Here is the output for a failure case with the -J option. Please file a ticket. But as the distance between two hosts increases, the speed of light remains constant. Is the difference between additive groups and multiplicative groups just a matter of notation? You'll want to directly to iperf3 site to get their feedback. I just tried disabling IPv6 both on my Windows system and on pi64.local. I'll try with tshark, but if the data is being sent to another interface other than the one connected to the network where the listener is connected, the data shouldn't be received at all. Do I have to spend any movement to do so? Later this week I will try to build a Windows version with additional debug messages. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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 (If it fails, please inform with the error message and the operating system and kernel details). If I use hostnames for other Windows hosts on my LAN, I never see the problem. I built iperf3 myself on all these. iPerf just defaults to whatever your routing table tells. For the purposes of this exercise, lets use those customizations as our baseline. Is there a proper way to do this with autoconf ? 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+. We are assuming this is the result of a negative response from CoreDNS, not a timeout or other connection issue to CoreDNS. I let the code proceed to the call to getaddrinfo() regardless, and that call never failed. How to correctly set hostname and domain name? Hi Bob, Re: the network dumps, yes, I will take some. I have set the IPv6 address fddb:fe2a:ab1e::c023/64 on teamed interface team0. https://sourceforge.net/p/iperf2/discussion/general/thread/e930dab50a/?limit=25#df71/ba93, https://sourceforge.net/p/iperf2/discussion/general/, https://sourceforge.net/auth/subscriptions/. 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. I was still hitting remote systems. If that is the case, then I'd ses a use for incrementing the source stream ID, as that's what distinguishes clients from each other, but not incrementing the destination stream ID as that's how a single listener determines if a client is attempting to connect. --bidir option randomly fails with "iperf3: error - GitHub Having the VMs running in the backgrounds might cause some of the CPU cores to be reserved for them, and thus reduce the possibility of iperf3 threads jumping between CPU cores/threads, making the race condition much less likely to show up. It might be good to use something like tcpdump -i dev to see what interface is being used. Could you see this being a useful feature? https://sourceforge.net/p/iperf2/discussion/general/, To unsubscribe from further messages, please visit an iperf stream from any other traffic received at the raw Ethernet 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. Now the -c % works!!!! Can you post the packet structure proposed? |[ 4] local 192.168.0.10 connected with 192.168.0.20 We have a multicast environment that we want to test. Is this a concern and/or something we should be handling? For IPv6, when doing ping to a link-local scope address, link specification (by the '%'-notation in destination, or by this option) is required. The problem seems prevalent whenever there is more than one socket indeed, not just with --bidir . Normally, the OS will cache the result of the DNS lookup, and this situation will just not occur. to write there your hostname and the hostname in hosts.save. However, is this really something that one would expect to be relying on in the context of a single iperf run with multiple sockets ? I work for developing hsr/prp protocol in Linux kernel. I think this extra field will be good to have. We are in the process of upstreaming these changes to the community kernel. I found an old issue about that for gethostbyname(). 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. b[ ID] Interval Transfer Bandwidth Jitter Lost/Total python - socket.gaierror: [Errno -2] Name or service not known with Even though I have not seen iperf3 fail in single socket mode again, I am also able to show the problem even on the first iteration when running the test program multiple times from a batch file. 168.63.129.16 via 10.2.128.1 dev eth0 proto dhcp src 10.2.128.27 metric 100 Commit is here. It uses port 5001 by default, and the bandwidth it displays is from the client to the server. 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. It's probably a version differentiation. I think it is an OS bug. iperf3: error - unable to start listener for conne - VMware but whatever you put after the % is printed on the third line, but doesn't work at all. ? I got the same error, nc is working normal , iperf3 connect refused. UNIX is a registered trademark of The Open Group. Reload to refresh your session. 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. If it fails again, kill iperf using the above command and repeat step 1 again. And compile it by enabling SCTP. iperf -c % I didn't succeed in building debug binaries, which is why there is no pull request attached. Destination MAC (6 bytes) Already on GitHub? If you would like to refer to this comment somewhere else in this project, copy and paste the following link: 2023 Slashdot Media. -t is to specify the communication time duration. 172.30.0.0/22 interface proto kernel scope link src 172.30.0.27, Kernel IP routing table To your shock, you see Time Remaining: 10 Hours.. (0.0028%), broot@am57xx-evm:~/iperf/src# ./iperf -s -j hsr0 Add the myhostname entry to the hosts service in /etc/nsswitch.conf. The output on the client side will look like this: ------------------------------------------------------------, Client connecting to 10.10.10.5, TCP port 5001, [ 3] local 0.0.0.0 port 46956 connected with 168.192.1.10 port 5001, [ 3] 0.0- 10.0 sec 10.0 MBytes 1.00 Mbits/sec. Operating system (and distribution, if any): Windows 10 21H2 (client side) . You'll have to compile from source. Connect and share knowledge within a single location that is structured and easy to search. such as DNS or NIS (or maybe ActiveDirectory? If I use localhost as the hostname, I never see the problem, and the command returns almost instantly We have a multicast environment that we want to test. [ 3] 0.0- 5.0 sec 636 KBytes 1.04 Mbits/sec You signed in with another tab or window. That will be helpful. On Linux, we get: "error: Name or service not known" no matter what "dev" name we try. The main reasons I think this is the way to go is both because it may take MS a long time to fix the issue (if at all) and because iperf3 is not officially maintained for Windows. I am still using the exact same Aquantia physical NIC, too. Destination Gateway Genmask Flags MSS Window irtt Iface 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). That would be helpful. As far as adding a loop to work around this problem, do you really think this is the way to go here ? iperf3 on Windows, iOS, or Android. TI implementation support offload protocol handling to TI' PRU ICSS. What are the advantages and disadvantages of making types as a first class value? interface, not necessarily over HSR. Check the man page. bServer listening over raw socket I like iperf as it consumes less CPU cycle based on my tests. A short option isn't required so --raw is enought. First make 'A' the server and 'B' the client. Note: Iperf isn't related to wireshark and there shouldn't be any coupling. Status: inactive. Also, netstat -gn might have some information, 20:16:31.211955 IP (tos 0x0, ttl 1, id 47314, offset 0, flags [DF], proto UDP (17), length 1028) Install it using the standard process. Do large language models know what they are talking about? Would you mind providing a pointer to the source/patch you used that contains all your debug messages ? I modified the test case to use getaddrinfo, since gethostbyname is deprecated. it might get succeeded. Why did Kirk decide to maroon Khan and his people instead of turning them over to Starfleet? 169.254.169.254 10.2.128.1 255.255.255.255 UGH 0 0 0 eth0 And then edit /etc/hosts Also, maybe default the ethertype to 88B5 when --raw is set that way it doesn't need to be passed in. For signature, we were thinking more along the lines of a unique 4-byte identifier. In my opinion it depends on version of hostname command (net-tools package). Ethernet frame instead of UDP or TCP transport.. Is it an old version? This issue is also not directly related by may be interesting. (2) If still iperf with -z fails. inet 10.2.7.4/24 brd 10.2.7.255 scope global eth2 Name or service not known Ask Question Asked 6 years, 11 months ago Modified 5 years, 6 months ago Viewed 13k times 6 I have been trying to get the ipaddress of the person who logged into the machine using the below code but I get a error. The best answers are voted up and rise to the top, Not the answer you're looking for? Note that the thread spans several months and the "Next message" is applicable only for the specific month. but you should not put a dynamically assigned address into your hosts file Julien, regarding the issue was with gethostbyname(), I am not able to find it again. So, I think the right fix is a wrapper for getaddrinfo that would do both retries and caching. So, it may not be related. I tried something a little different. The intention here is for providing the user with another mechanism for filtering packets as seen in Wireshark. That is the nature of race conditions. in your /etc/hosts file, Everyone agrees that it should be an address that "works" for your host; I'll post my findings tomorrow if I get someone. I wrote a program that performs multiple iterations of gethostbyname as follows : This fails randomly, whether compiled with cygwin/gcc or MSVC : Unfortunately, I still have no clue as to the root cause, but it's fair to say it's not an iperf3 or a cygwin bug. and that it's not in your naming service (e.g., DNS or NIS). b------------------------------------------------------------ chef Network Error: getaddrinfo: Name or service not known Within the payload, we include a packet ID, timestamp, and a stream ID as in UDP. valid_lft forever preferred_lft forever. Actually, the fact that you have WSL Linux running might actually be the reason why you can't reproduce the issue. b[ 4] local 192.168.0.10 connected with 192.168.0.20 Timestamp (4/8 bytes) On a gigabit link, this about the maximum throughput one could hope to achieve before saturating the link and causing packet loss. Some examples for bpf based fast drops are here. Perhaps like this: The "[ ]" just indicates it's optional and would only be included on client initiation. The only other things I can think of would be to try switching the roles of the client and server hosts (if possible), or to try running an iperf3 server on one of the hosts and having an iperf3 client do a test to itself. 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. [dir="rtl"] .ibm-icon-v19-arrow-right-blue { Here the communication time is 10 seconds and it'll report the bandwidth for each 2 seconds interval. So, I don't think the option is being honored. Sign in Build iperf3 on Windows. In this case, the error never appears. This is the implementation I'm using, can't find any obvious documentation of the SCTP commands related to this. common values are 127.0.0.1 and 127.0.1.1. http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Industrial_Protocols_HSR_PRP.html#linux-software. I'm running Ubuntu 14.04 on my company's cloud service From examining the code, I believed that each flag needed to have a single letter flag associated with it as well. I want tocheck out the IPaddress of my instance I'm running I don't believe this should affect the decision of whether or not to cache the output of a gethostbyname() / getaddrinfo(). I checked the hostname's IP and it worked Some people recommend using a loopback address. [ ID] Interval Transfer Bandwidth In our RunRaw()method (instead of RunTCP(), RunUDP()): To clarify what I had previously mentioned, I understand iperf is generally used in a controlled network but perhaps the customizable Ethernet type could be useful in a real-world network. Stream ID(4 bytes) I'd onlyy add a short option if it was intutitive to the user. The old 3.1.3 binaries I used come with the old cygwin DLL, which rules out a cygwin regression as the root cause. icons, By: There is some debate over the question of When activated, it tries to send as much data down your pipe as it can, spitting out transfer statistics as it does. I only saw it fail on the first iteration, and never subsequent ones. Can I knock myself prone? |[ 4] 0.0-10.0 sec 99.1 MBytes 83.4 Mbits/sec 0.041 ms 2/70562 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. Not much info in there except the CPU and Windows 10 build number. If you don't think the customizable route is best, would there be a specific Ethernet type you'd recommend we use? 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? I like the idea of specifying the identifier as part of initiating the iperf client/server on the command line. 10-second test between 192.168.0.20 (client) and 192.168.0.10 (server), [ 3] local 192.168.0.20 connected with 192.168.0.10, [ 3] 0.0-10.0 sec 1.24 MBytes 1.04 Mbits/sec, [ 3] 0.0-10.0 sec 1.24 MBytes 1.04 Mbits/sec 0.045 ms 0/ 874 (0%), Server: (my instance has elastic IP). 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. We plan to further explore adding eBPF capability as well. Browse other questions tagged. Finally, might consider installing a bpf as well. should be entered into your DNS records automatically). You signed in with another tab or window. To utilize UDP instead of TCP for iPerf testing, you would have to simply use the -u flag. If interface in an interface name, it sets source interface to specified interface. By: "Name or service not known" error while domain name is surely existing Also, is it possible to try the latest from master for Linux? Making statements based on opinion; back them up with references or personal experience. It may be that the issue is related to changes in Windows and/or Cygwin. You may have experienced the following scenario yourself: You just provisioned a new bad-boy server with a gigabit connection in a data center on the opposite side of the globe. Iperf3 not working: unable to send cookie #22163 - GitHub You begin to upload your data. How could the Intel 4004 address 640 bytes if it was only 4-bit? Why I failed to compile a sctp program in Linux? The first problem is that with -c, we can't make the %dev 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. So. While responding to your message, I had 3 VirtualBox VMs running in the background on my Windows desktop. How to get the computer name (not its hostname)? Whats wrong with the network? you wonder. general, ambiguous sense) doesn't know that the name ubuntu14-graphite Have a question about this project? e.g. As far as I am aware there is no request for review, or at least it is not used. 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. Parallel streams! socket.gaierror: [Errno -2] Name or service not known - Python Forum Ultimately it is the system that will resolve the name to a ip address using its configured method, not python. A list of frequently-asked questions 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. 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. Iperf 2 doesn't have this in the immediate plans. As you have suggested to us, please find below the proposed changes to The reason being Grid applications based on iec61850 directly opens raw socket and send Ethernet frames. Posted In. I don't think it's in iperf's interest to do add such support. Ping issue "Name or service not known" - Red Hat Customer Portal 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. ubuntu - I got error "hostname: Name or service not known" when Wireshark can have iperf disectors but that's about all. Why are lights very bright in most passenger trains, especially at night? 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 If I could build an executable with debug information, I would step through the code and find the places to add the debug messages myself. fer-test-ubu-01.internal.cloudapp.net.42930 > 239.1.1.2.10000: [bad udp cksum 0x7e22 -> 0xdcc0!] Can you use -c 239.1.1.2%dev and on the server -B 239.1.1.2%dev or -B 0.0.0.0%dev, default via 10.2.128.1 dev eth0 proto dhcp src 10.2.128.27 metric 100 And I wasn't even hitting the iperf3 server in those VMs. 1. Ok, now that I've compiled and tried it, but I don't know if it's working. Then make 'B' the server and 'A' the client. You switched accounts on another tab or window. I see gerror is declared as extern int, ie. I've changed it like you wrote (I mean "#define Socklen_t socklen_t") and it compiled OK. Hopefully another Windows user in the community might be able to shed some light on this. Unlike TCP/UDP-based connections, connections over a raw Ethernet socket Get a copy of iperf which supports lksctp module of linux kernel. ), (-z for SCTP, -c is for client. Two machine is possible icmp request and reply without any problem. How to maybe reset the buffer size? Using the stream ID, we can distinguish iperf connections from non-iperf connections. question sites such as Stack Overflow I still don't know how the --raw payload is being created and I think the current cli proposal is incomplete. Why do I get hostname: Name or service not known error? I was only able to reproduce the problem about once out of 20 tries. Sending 1000 byte datagrams, IPG target: 7629.39 us (kalman adjust) Is there any error reported on the server side? Our proposed solution is to include a signature in the iperf header, in This almost surely means that you don't have aline for ubuntu14-graphite The logic is quite messy. Should our modification include functionality allowing for multiple clients to connect to the same server? I think it's prudent to have a source ID somewhere in the packet or payload, similar to how TCP and UDP have been defined. However, running iperf -c -B does appear to work. I have another server (not cloud instance but physical server). Now to use SCTP in iperf these are the proper syntaxes. So what more can we do? UDP buffer size: 208 KByte (default), [ 1] local 10.2.128.77 port 38869 connected with 239.1.1.2 port 10000. First check if it is already enabled or not by running these two commands in the terminal. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. All good suggestions. What are your thoughts on the idea? But if I use the -c & -B with the IP of another interface (not the one that iPerf used if I don't use the -b), then packages goes through THAT interface. socket.gaierror: [Error -2] Name or service not known I am running a server under WSL Linux and a client under Cygwin terminal in the same PC without problems. I see in the iperf3 code that when the client is connecting to a socket, errno EINPROGRESS is regarded as a successful connection, and that by default the client does not wait for the connection to complete. We've done some support for PF_PACKET sockets in a way to test L2 drivers. Also things like igmp and mld come into play too. Hardware: AMD 5950X, 32GB, Aquantia AQN-107 NIC (client) https://sourceforge.net/p/iperf2/discussion/general/thread/e930dab50a/?limit=25#df71/ba93, Sent from sourceforge.net because you indicated interest in Of course, it's very unlikely the race would be reproducible within the debugger itself. UDP buffer size: 208 KByte (default). 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. That is probably not the right forum, though. So what isiPerf, and how does it fit into all of this? It is not a means for asking With the raw flags selected, the client and server will begin transmission and receiving over a raw Ethernet socket. There are several issues about this problem in Windows. 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. If the two machines are 'A' and 'B'. Datagrams On latest build using -c with %dev prints something, but it's not working either. I've read the man page of iPerf (https://iperf2.sourceforge.io/iperf-manpage.html) and on the Binding note it says: This seems to be contradicting my actual experience. the -B address is the source address put in the packet for transmit. Loopback addresses are always of the form 127.B.C.D; So, I don't know if IPv6 is part of the problem or not. You signed out in another tab or window. Well occasionally send you account related emails. is to add ubuntu14-graphite (and its IP address) to your /etc/hosts. I have also tried running the test program on several other Windows hosts, and it never fails on any of them, although it is similarly very slow when trying to resolve those non-Windows LAN hostnames. Is this something you can do? 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. I am aware support can't be provided for Windows, but I still think it's worth filing and tracking the issue here. Can an open and closed function be neither injective or surjective. Another idea that Murali and I had discussed was adding a flag allowing for customization of ethertype. This would explain why you didn't see anything special about the /etc/hosts file on the system that you could resolve the local hostname. I think the proper fix should cache the response. Support may be provided on a best-effort basis to other UNIX-like Enter a remote host to scan: http://www.osjajinci.com/ Traceback (most recent call last): File "portscanner.py", line 12, in <module> remoteServerIP = socket.gethostbyname (remoteServer) socket.gaierror: [Errno -2] Name or service not known [SOLVED] Name or service not known / Newbie Corner / Arch Linux Forums We can retrieve the interface using existing options as you've suggested. In data transmission, TCP sends a certain amount of data and then pauses. I also thought about caching the responses. or maybe set it to the maximum (8 MB (8096 KB)) as the default buffer size for TCP connection in iperf is 128 KB. How do I get the coordinate where an edge intersects a face using geometry nodes? 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. ethertype are the experimnental ones of 88B5 and 88B6. Other relevant information (for example, non-default compilers, iPerf3 Server screen(Server IP is 192.168.200.253), iPerf Client Screen.