Nmap Strange Error From Connect 105 No Buffer Space Available
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got this error when I was testing a home-made distributed key-value store on very large scale (2048 machines), it works fine on 1024 machines. The communication pattern is n:n,which means each machine send lots of requests to every one else. I used C TCP socket to implement it, SO_REUSEADDR to recycle those sockets. Can any one give me some tips about the possibilities that can cause this error? The code connect no buffer space available checkpoint is complex, It's hard to simplify it and post here without losing necessary logic. So I just want to know all the possible causes to start to debug. BTW I changed settings as: echo 8000 > /proc/sys/kernel/threads-max echo 8000 > /proc/sys/net/core/somaxconn #limit of listen queue, default is 128 echo 8000 > /proc/sys/net/core/netdev_max_backlog echo 10 > /proc/sys/net/ipv4/tcp_fin_timeout echo "10000 65000" > /proc/sys/net/ipv4/ip_local_port_range I did this is just for enable maximum number of connections. Thanks, -Tony c sockets tcp connection share|improve this question edited Apr 15 '12 at 8:29 asked Apr 15 '12 at 8:08 Tony 1131413 Too many open descriptors could cause this error, also MTU misconfigurations and a number of other conditions, I imagine. Impossible to tell for sure without some minimal code example that exhibits the problem. –Michael Foukarakis Apr 15 '12 at 8:13 The error was not "too many open file descriptors" which I met before. I also have these settings: echo 8000 > /proc/sys/kernel/threads-max;; echo 8000 > /proc/sys/net/core/somaxconn;; echo 8000 > /proc/sys/net/core/netdev_max_backlog;; echo 10 > /proc/sys/net/ipv4/tcp_fin_timeout;; echo "10000 65000" > /proc/sys/net/ipv4/ip_local_port_range –Tony Apr 15 '12 at 8:19 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote I had the same problem as your “No buffer space available” error.
HCL Search Reviews Search ISOs Go to Page... LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie connect : no buffer space is available User no buffer space available ubuntu Name Remember Me? Password Linux - Newbie This Linux forum is for members putty network error no buffer space available that are new to Linux. Just starting out and have a question? If it is not in the man no buffer space available putty pages or the how-to's this is the place! Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. You are currently viewing LQ as a guest. By joining our community you will http://stackoverflow.com/questions/10160479/tcp-connect-error-no-buffer-space-available have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today! Note that registered members see fewer ads, and ContentLink is completely disabled once you log in. Are you new to LinuxQuestions.org? Visit the following links: Site Howto | Site FAQ | http://www.linuxquestions.org/questions/linux-newbie-8/connect-no-buffer-space-is-available-359572/ Sitemap | Register Now If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here. Having a problem logging in? Please visit this page to clear all LQ-related cookies. Introduction to Linux - A Hands on Guide This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. Click Here to receive this Complete Guide absolutely free. Search this Thread 09-02-2005, 01:46 PM #1 koodoo Member Registered: Aug 2004 Location: a small village faraway in the mountains Distribution:
No buffer space available Issues related to configuring your network Post Reply Print view Search http://www.centos.org/forums/viewtopic.php?t=55162 Advanced search 4 posts • Page 1 of 1 sfool3 http://goingmerry-yuuko.blogspot.com/2008/04/prctica-21-tutorial-nmap.html Posts: 1 Joined: 2015/11/24 09:38:46 ping - connect: No buffer space available Quote Postby sfool3 » 2015/11/25 04:07:05 Hello~I'm having problem below in Centos server. Server installed PBX S/W.[root@server1 ~]# ping 10.0.1.34connect: No buffer space availableI re-installed CentOS and SW no buffer in server. Moreover it is re-installed to the VMWare to prevent an H/W error.So problem with network interfaces unstable operations still occurs.Thanks for any help.-------------------------------------------------------CentOSversion : 5.4kernel : Linux scm_act 2.6.18-164.11.1.el5PAEHW : 4G mem, 4 eth port, Dell server------------------------------------------------------- Top TrevorH Forum Moderator Posts: 16887 Joined: 2009/09/24 10:40:56 Location: Brighton, UK no buffer space Re: ping - connect: No buffer space available Quote Postby TrevorH » 2015/11/25 08:58:35 Why why why would you install 5.4 on a fresh install?! 5.4 was released in 2009 so is now over 6 years old and has 6 years worth of security bugs in it. If you must use 5.x then at least use 5.11. CentOS 5 dies in March 2017 - migrate soon!Full time Geek, part time moderator. Use the FAQ Luke Top aks Posts: 1995 Joined: 2014/09/20 11:22:14 Re: ping - connect: No buffer space available Quote Postby aks » 2015/11/25 17:00:47 I don't know what SW is....You don't say if it's wired, wireless or something like 3G etc...I'd guess that there is not enough write buffer space to send (/proc/sys/net/core/wmem_max)I'd suggest running an strace on your ping command.... Top yogeshpujari Posts: 1 Joined: 2015/12/03 11:25:28 Re: ping - connect: No buffer space available Quote Postby yoges
paquetes Synaptic o desde una terminal. Una vez que los hemos instalado comenzaremos con el tutorial.(*Nota: Para mejor visualización de las capturas, pulsar con el botón derecho del ratón sobre las imágenes y abridlas en una nueva pestaña.)1 Averiguar los puertos abiertos del equipo 172.26.103.8. Abriremos Knmap que lo encontraremos en Aplicaciones/ Accesorio/ Terminal. Cuando esté abierto, escribiremos en la barra de "Target host(s)" la IP 172.26.103.8 y pulsaremos en "Start nmap".Nos aparecerá el siguiente código indicándonos que el equipo con IP 172.26.103.8 tiene todos los puertos abiertos.2 ¿Cuál es el Sistema Operativo del equipo con IP 172.26.103.8?Para comprobar cuál es el sistema operativo de este equipo iremos a la pestaña "Simple Option" de Knmap y marcaremos la casilla de verificación de "OS Detection (-O)".Después pulsaremos en "Start nmap" y nos aparecerá el siguiente código:kdesu -n /usr/bin/nmap -T Normal -O 172.26.103.8 > /tmp/kde-alumno/knmap_stderr_1017100316 2> /tmp/kde-alumno/knmap_stderr_1385659310Starting Nmap 4.20 ( http://insecure.org ) at 2008-04-25 09:31 CESTInteresting ports on 172.26.103.8:Not shown: 1694 closed portsPORT STATE SERVICE53/tcp open domain111/tcp open rpcbind10000/tcp open snet-sensor-mgmtMAC Address: 00:0F:EA:31:C5:FA (Giga-Byte Technology Co.)No exact OS matches for host (If you know what OS is running on it, see http://insecure.org/nmap/submit/ ).TCP/IP fingerprint:OS:SCAN(V=4.20%D=4/25%OT=53%CT=1%CU=33247%PV=Y%DS=1%G=Y%M=000FEA%TM=481188EOS:0%P=i686-pc-linux-gnu)SEQ(SP=D8%GCD=1%ISR=EF%TI=Z%II=I%TS=8)SEQ(SP=D8%GCOS:D=2%ISR=EF%TI=Z%II=I%TS=8)SEQ(SP=D8%GCD=1%ISR=EF%TI=Z%II=I%TS=8)OPS(O1=MOS:5B4ST11NW4%O2=M5B4ST11NW4%O3=M5B4NNT11NW4%O4=M5B4ST11NW4%O5=M5B4ST11NW4%OS:O6=M5B4ST11)WIN(W1=16A0%W2=16A0%W3=16A0%W4=16A0%W5=16A0%W6=16A0)ECN(R=Y%OS:DF=Y%T=40%W=16D0%O=M5B4NNSNW4%CC=N%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F=AS%RD=OS:0%Q=)T2(R=N)T3(R=Y%DF=Y%T=40%W=16A0%S=O%A=S+%F=AS%O=M5B4ST11NW4%RD=0%Q=)OS:T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T5(R=Y%DF=Y%T=40%W=0%S=Z%A=SOS:+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T7(R=Y%DF=OS:Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(R=Y%DF=N%T=40%TOS=C0%IPL=164%UN=0OS:%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUL=G%RUD=G)IE(R=Y%DFI=N%T=40%TOSI=S%CD=S%SOS:I=S%DLI=S)Uptime: 0.030 days (since Fri Apr 25 08:49:08 2008)Network Distance: 1 hopOS detection performed. Please report any incorrect results at http://insecure.org/nmap/submit/ .Nmap finished: 1 IP address (1 host up) scanned in 11.862 secondsEl sistema operativo que