And compile it by enabling SCTP. By default a multicast dest would go out all interfaces because it's multicast. OK. 3: eth1: mtu 1500 qdisc mq state UP group default qlen 1000 (If it fails, please inform with the error message and the operating system and kernel details). This is interesting. Well occasionally send you account related emails. Get a copy of iperf which supports lksctp module of linux kernel. error on vmotion adapter # iperf version iperf 3.1.6 #turning of the firewall esxcli network firewall set --enabled false # running the server side of iperf /usr/lib/vmware/vsan/bin/iperf3.copy -s -B X.Y. I noticed that each iteration takes about 1.5 second, whether successful or failed. If you don't think the customizable route is best, would there be a specific Ethernet type you'd recommend we use? Developers use AI tools, they just dont trust them (Ep. Do you still have the same problem or it happens only with TCP? From that conclusion, we focused on tweaking TCP to get the most out of the network. As it seems from the results you got that if the first call fails the next call is always successful, I think a PR should be submitted to iperf3 where a failed getaddrinfo is called again (maybe loop of 3 calls?). We will never get 100% out of any link. platforms. You switched accounts on another tab or window. Would you mind providing a pointer to the source/patch you used that contains all your debug messages ? e.g. It is not a means for asking Note that the thread spans several months and the "Next message" is applicable only for the specific month. Of course, it's very unlikely the race would be reproducible within the debugger itself. I have several interfaces. Of course, it's very unlikely the race would be reproducible within the debugger itself. On a gigabit link, this about the maximum throughput one could hope to achieve before saturating the link and causing packet loss. I just restored my OS from backup, since no 3rd party software seems to be causing the problem. Connect and share knowledge within a single location that is structured and easy to search. 2: eth0: mtu 1500 qdisc mq state UP group default qlen 1000 streams from each other. iperf 3.7. I want tocheck out the IPaddress of my instance I'm running (1) To use iperf for SCTP, you must enable the SCTP module in the kernel and recompile it. You'll want to directly to iperf3 site to get their feedback. We've done some support for PF_PACKET sockets in a way to test L2 drivers. Some examples for bpf based fast drops are here. Also, since it takes over a second to create the socket in this case, I think the proper fix should cache the response. iperf3_test_bidir_issue_1314.zip. Is this a concern and/or something we should be handling? Original Article written by Andrew Tyler. Have ideas from programming helped us create new mathematical proofs. Just an idea. 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) (0.0028%), broot@am57xx-evm:~/iperf/src# ./iperf -s -j hsr0 More Hi Looking at the "Binding" note on the man page (https://iperf2.sourceforge.io/iperf-manpage.html), it says that we can use "-c %" so we are lost here.. Destination Gateway Genmask Flags MSS Window irtt Iface Looking for this. 2 Answers Sorted by: 0 Get a copy of iperf which supports lksctp module of linux kernel. It won't succeed. On the server-side, your suggestion could work however, it would prevent the ability for multiple clients to connect to the same server as the server is looking for a unique ID specified on the command line. We have a multicast environment that we want to test. platforms. the -c device is for transmit interface and bypasses routing. 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. iPerf just defaults to whatever your routing table tells. and that it's not in your naming service (e.g., DNS or NIS). Try using UDP ( -u )? iperf3 on Windows, iOS, or Android. This is where well use the TCP window options and parallel streams. I actually managed to build the debug binaries since your last post. E-mail this page, Two of the most common network characteristics we look at when investigating network-related concerns are speed and throughput. 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. I posted about the issue in : https://answers.microsoft.com/en-us/windows/forum/all/getaddrinfo-api-call-randomly-fails-for-unix-lan/26cff155-6649-4c80-8559-c8d798df2bd4. How to resolve the ambiguity in the Boy or Girl paradox? b[ ID] Interval Transfer Bandwidth Jitter Lost/Total error: Name or service not known uint32_t tv_sec; 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. On Linux, we get: "error: Name or service not known" no matter what "dev" name we try. Should our modification include functionality allowing for multiple clients to connect to the same server? I believe it may really help. For signature, we were thinking more along the lines of a unique 4-byte identifier. might be useful before sending patches. https://sourceforge.net/auth/subscriptions/, I don't think -j is needed as iperf 2 already supports device specifiers per the % convention. Is this something you can do? We are in the process of upstreaming these changes to the community kernel. Forgot to answer the multiple client case. Is there more information somewhere as I have no expertise in hsr/prp. UDP buffer size: 208 KByte (default), [ 1] local 10.2.128.77 port 38869 connected with 239.1.1.2 port 10000. I used cygwin for the build. I'm running Ubuntu 14.04 on my company's cloud service 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. Should i refrigerate or freeze unopened canned food items? Note: Iperf isn't related to wireshark and there shouldn't be any coupling. 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). Depending on your thoughts, we'd also like to add a --ethertype flag followed by a 2-byte Ethernet type allowing the user to customize the Ethernet type for filtering purposes in packet sniffing applications. Can you provide the client command? 169.254.169.254 10.2.128.1 255.255.255.255 UGH 0 0 0 eth0 We cannot provide support for building and/or running requests, or submissions of code. We use iPerf 2.0.13 on Windows (Server 2019) and Linux (Ubuntu 20.04). I already shutdown windows firewall and ubuntu firewall with the following command, root@CHANGHEESHIN01-5501I5:/usr/bin# ufw disable 10-second test between 192.168.0.20 (client) and 192.168.0.10 (server), 20-second test between 192.168.0.20 (client) and 192.168.0.10 (server), 5. So what isiPerf, and how does it fit into all of this? the configure didn't do the trick, that's why I tried it manually. Ultimately it is the system that will resolve the name to a ip address using its configured method, not python. @madbrain76, thanks for the detailed info. iperf, sctp command not recognized in command-promt even though there was nothing special in /etc/hosts. To utilize UDP instead of TCP for iPerf testing, you would have to simply use the -u flag. iperf3: error - unable to connect to server: No buffer space available [SOLVED] Ping: google.com: name or service not known / Newbie Corner Adding raw socket support might be doable though I need to better understand the request's requirements . root@CHANGHEESHIN01-5501I5:/usr/bin# ufw status In my opinion it depends on version of hostname command (net-tools package). 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. http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Industrial_Protocols_HSR_PRP.html#linux-software. Let me check with an 802 standards guy to get his feedback on using a ethertype for iperf raw packets. Why would the Bank not withdraw all of the money for the check amount I wrote? See: https://bugzilla.redhat.com/show_bug.cgi?id=319981, hostname -i - gives me information about IPv6 and IPv4. 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. This would allow multiple clients to connect to the same server. I will rebuild with -O0 and investigate further tomorrow. Share this page on LinkedIn A possible ethertype are the experimnental ones of 88B5 and 88B6. You signed out in another tab or window. iperf3: error - unable to connect to server: Connection refused. Can the -c be a L2 MAC address? Some people recommend using a loopback address. I was able to reproduce the problem with multiple TCP streams, also. We intend to add a --raw flag followed by 4-byte stream ID that the server can use to distinguish iperf traffic. iperf3 on Windows, iOS, or Android. These might give some other information to help solve the problem. I modified the test case to use getaddrinfo, since gethostbyname is deprecated. It may be that the connection from Windows takes more time (or that the Cygwin implementation of connect() is different. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Both HSR and PRP protocols are for redundancy by duplicating frames. i.e., commands like pingA.B.C.D should succeed. 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. 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. We can overcome BDP to some degree by sending more data at a time. 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. Use commands like ifconfig and hostname-I How can I know if iPerf is sending the data over the correct interface if I use, say, eth1? Are you going to do that? So we would like to have iperf2/3 extended to send and receive frames and measure throughput. HSR is currently supported in upstream Linux kernel and reside under net/hsr/ folder of kernel source tree. Also, maybe default the ethertype to 88B5 when --raw is set that way it doesn't need to be passed in. Why are lights very bright in most passenger trains, especially at night? David, the issue appears to be about connect() indeed, not gethostbyname(). For IPv6, when doing ping to a link-local scope address, link specification (by the '%'-notation in destination, or by this option) is required. If I use Internet DNS hostnames, I never see the problem. This will allow more focused evaluation of the problem. iperf3 as well in the future. Internet will disconnect even i did enabled network manager service during installation process. I was still able to reproduce the problem. ](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. You signed in with another tab or window. The current design is iperf servers work with iperf clients and the "test protocol" is between them. I am running a server under WSL Linux and a client under Cygwin terminal in the same PC without problems. Iperf as designed is a socket tool at the moment, writes() to reads(). Please let us know your response to the proposed solution. If it fails again, kill iperf using the above command and repeat step 1 again. And the hostname only resolves to an IPv4 address, for some reason. If you want to evaluate this issue further: I am running a server under WSL Linux and a client under Cygwin terminal in the same PC without problems. That will be helpful. Please note: iperf3 is supported on Linux, FreeBSD, and macOS. Maybe try using different server port numbers (--port), in case 5201 and some other ports are blocked for some reason. Here the communication time is 10 seconds and it'll report the bandwidth for each 2 seconds interval. I was only able to reproduce the problem about once out of 20 tries. On latest build using -c with %dev prints something, but it's not working either. to your account. Thanks for the help about setting the optimization level. Check it using uname -a or uname -r. If you have a lower one, then download a new kernel from The Linux Kernel Archives. The problem with %dev is that it doesn't work! https://en.wikipedia.org/wiki/High-availability_Seamless_Redundancy. Server is a variety of Unix platforms. Then make 'B' the server and 'A' the client. Hopefully another Windows user in the community might be able to shed some light on this. iperf_udp_connect (): before and after the call to netdial (). This is interesting! I'd suggest support for both a dst and src streamid. Install it using the standard process. h_errno has a value of 1, which is HOST_NOT_FOUND . (Although I tried with 3.7 server with no problems.). To further evaluate the issue I suggest adding the following (I can do it my self, but it seems it is faster that you will make the changes and may enhance them per the results you get): (Regarding not using threads: this is one of the main design decisions iperf3 developers took - is in the FAQ.). Please fill out one of the "Bug Report" or "Enhancement Request" Perhaps like this: The "[ ]" just indicates it's optional and would only be included on client initiation. (http://www.stackoverflow.com/). NOTE: The iperf3 issue tracker is for registering bugs, enhancement I edited my question because i noticed one more case related to my CentOS server which doesn't have anything but 127.0.0.1 localhost but i still be able to check my host's IP. Firewall stopped and disabled on system startup Is there a way to sync file naming across environments? the -B address is the source address put in the packet for transmit. Nothing obvious that I can see. server = pi64.local, portstr = 5201, hints.ai_family = 0, hints.ai_socktype = 1. ie. Iperf 2 doesn't have this in the immediate plans. So, it may not be related. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Each can be done in separate pull requests. Why I failed to compile a sctp program in Linux? If interface in an interface name, it sets source interface to specified interface. A list of frequently-asked questions https://software.es.net/iperf/. fill:none; is to add ubuntu14-graphite (and its IP address) to your /etc/hosts. We have some bandwidth available for the raw socket support and want to do this support and send patches to both iperf2 and iperf3. 1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 Are throat strikes much more dangerous than other acts of violence (that are legal in say MMA/UFC)? Sorry for the late reply. If you're using a more sophisticated (distributed) naming system the input arguments are identical for the failure or success cases of this API call. 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. Here is the output for a failure case with the -J option. Another idea that Murali and I had discussed was adding a flag allowing for customization of ethertype. 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. However, running iperf -c -B does appear to work. I only saw it fail on the first iteration, and never subsequent ones. I don't think it's in iperf's interest to do add such support. Reload to refresh your session. May give additional information that can help. In fact, the culprits are none other than TCP and the laws of physics. b------------------------------------------------------------ You switched accounts on another tab or window. However, please don't close the issue. |[ 4] local 192.168.0.10 connected with 192.168.0.20 ping displays "Name or service not known" Asked 4 years, 1 month ago Modified 1 year, 9 months ago Viewed 152k times 22 I am running Arch Linux on a Raspberry Pi. Also, is it possible to try the latest from master for Linux? If you need some sort of sink for a new protocol, that's probably not iperf. That would be helpful. Draw the initial positions of Mlkky pins in ASCII art. Built iperf3 from master. I'm investigating how to do that. ? https://sourceforge.net/p/iperf2/discussion/general/thread/e930dab50a/?limit=25#df71/ba93, Sent from sourceforge.net because you indicated interest in an iperf stream from any other traffic received at the raw Ethernet Reload to refresh your session. Can I knock myself prone? I'm not a dev, so bear that in mind before any insult :D 168.63.129.16 via 10.2.128.1 dev eth0 proto dhcp src 10.2.128.27 metric 100 I like the idea of specifying the identifier as part of initiating the iperf client/server on the command line. 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.
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