Networking :: Clarifiication Needed On Tcp_keepalive Messages?
Feb 23, 2011
Need some clarifications on TCP_keepalive . We are facing some issues on our Prod servers related to TCP functionality .The issue is like this for us. We have some machines at one end sending data in real time to another group of machines on the other end. Now due to some hardware issues on the other end , some of the machines becomes unresponsive/crashes. The client system which pumps data never came to know that the server went unresponsive . The connection remains in ESTABLISHED state and the client always tries to send data thinking that the connection is alive because of which we are seeing backlog on client sides.
Our understanding is like this on how TCP will handle the situation.
Q 1) Since the server went down , the client will try to the retransmit the data until it times out. What is the behavior of TCP after the timeout? Need clarification on the following things. a) Will the kernel will close the established connection after the timeout . Looks like no in our case as we
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Sep 23, 2010
When I try to create a network tunnel, I get ioctl: no such device returned by the terminal. Which modules do I need to ad with insmod to enable tunneling?
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Aug 3, 2009
I am trying to use my air card (Sprint U760), which works under Windows, on CentOS 5. I have a manual from Sprint that has instructions but I am having trouble with installing required PPP packages. The Sprint instructions say to go to Add/Remove Software and download packages KPPP and KPPPLogView. However, these packages do not appear in the list of available packages. I do have a working hard wired connection to the internet while I am get the air card working.
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Jul 13, 2011
I have a syslog-ng running and kernel build of 2.6.34.8 I use a syslog API in my program with facility LOG_LOCAL5 and and levels debug err and crit and info. when I ran on the older syslog facility I had everything logged fine as I intended. now I have written these rules into the syslog-ng.conf:
options {
flush_lines (0);
time_reopen (10);
log_fifo_size (1000);
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the last two rules show my program gnssapp. the result is all debug levels or crit or err levels I don't see any of them !
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May 30, 2009
More than 7 G bytes were logged to the messages file last three weeks I got this message in /var/log/messages I want to stop this messaging cause it takes to much space
Quote:
Apr 30 20:25:18 TEST-NODE kernel: IPT: IN_NOMATCH IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:17:a4:a7:3d:a2:08:00 SRC=172.26.16.27 DST=172.26.16.255 LEN=104 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=10100 DPT=10100 LEN=84
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May 23, 2009
I have a laptop (running Fedora 10 KDE version) and a desktop (running Ubuntu 7.10) on my home network. Is there any way to send messages from one computer to another through LAN ?
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Apr 19, 2011
For about 3-4 weeks, my file system used space was growing and growing. After some days, I decided to analyze the file system in order to understand what is going on. Well, the results returned that the log files at /var/log ( especially kern.log, syslog and messages ) were the log files that were sucking the free space. I searched if this was some kind of bug but it turned out that if these files are growing, the problem is in the records.
So I picked from the tail of the messages log the last 50 lines and I saw this:
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Apr 19 21:28:40 laptop kernel: [ 586.734226] [UFW ALLOW] IN= OUT=wlan0 SRC=192.168.1.2 DST=192.168.1.255 LEN=96 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=137 DPT=137 LEN=76
Apr 19 21:28:40 laptop kernel: [ 586.734287] [UFW AUDIT] IN=wlan0 OUT= MAC= SRC=192.168.1.2 DST=192.168.1.255 LEN=96 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF
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Jan 6, 2009
Got a Ubuntu system. Have a device on my LAN that can send Syslog messages.
I would like to:
1. Capture these specific syslog messages.
2. Keep them separate from any other syslog activity on the Ubuntu system.
3. View these syslog messages later.
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Jul 9, 2009
I have a C program which does.
1. Creates a UDP socket
2. Send the UDP Request packet to the TFTP server.
3. If the TFTP server is not listening in the 69 port, the remote machine send an ICMP ("Port Unreachable") message.
Is there a way to receive a notification from the Linux kernel on receipt of an ICMP packet to the created UDP socket.
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Oct 7, 2010
I have a RHEL 4 server delivering long messages to several RHEL 4 clients. They work fine.I am trying a RHEL 5 client running the same client application as the RHEL 4 clients. The RHEL 5 client looses most messages. have tried with two other clients running CentOS 5 with similar results. The server indicates write failure or blocked. The messages are typically 50 kilobytes. I have changed many parameters in sysctl.conf Has anyone encountered similar problems?
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Mar 4, 2011
I'm trying to get SNMP setup so I can send custom snmp trap messages. I followed this "How to" [URL] and I think I have it setup and working. This is my fist time messing around with SNMP, and I don't know where to check to see if I received the trap message. Do the snmp trap message even get logged any where?
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Apr 6, 2011
I am trying to install ns2.1b5 on fedora and I am getting the following error:
No rule to make target `VERSION', needed by `gen/version.c'
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Mar 24, 2011
I have written the Client-Server program to test my ethernet by using UDP protocol.
Server IP : 192.168.0.254
Client IP : 192.168.0.1
While Running the program I am getting some printk messages on Server machine.
What is the meaning of following statement that I am getting from debug statements
( /var/log/messages )
UDP: short packet: From 192.168.0.1:43898 418/416 to 192.168.0.254:7000
printk: 5 messages suppressed.
UDP: short packet: From 192.168.0.1:43898 556/553 to 192.168.0.254:7000
printk: 4 messages suppressed.
Only printk messages are printing in my Server console ( IP : 192.168.0.254 ).
printk: 5 messages suppressed.
printk: 5 messages suppressed.
printk: 4 messages suppressed.
printk: 2 messages suppressed.
printk: 4 messages suppressed.
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Jan 11, 2011
Is there a way to send messages from Ubuntu to windows xp computer, like NET SEND, in Windows network enviroment?
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Jan 11, 2010
I am doing a university course and am struggling to find a method of sending 1 message down route A and then the next message to the same destination via route B, alternating between the two with each new message sent.I am going to use a Linux computer with two Ethernet cards connected to two different networks via a routers and then to the destination host via a switch.
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Oct 12, 2009
I've just configured my Linksys RVS-4000 router to syslog messages to remote syslogd server (i.e. my CentOS5 machine). Redirecting messages was easy, but now I'm having difficulties to redirect those same messages received from Linksys to a separate log file. By default, all these messages are logged to /var/log/messages, and after browsing manual pages for syslog, syslog.conf, and syslogd, came to suspect that what I want isn't possible.
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Apr 26, 2010
I have a problem where I'm using Ubuntu linux to mount a Windows Vista machine's USB drive and access it on the web using Apache. I did have the USB drive plugged into the Linux machine directly and that was working via the web. FollowSymLinks is on in httpd.conf
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The mount works and I can see the files (see above) from my regular linux user account. If I make a test file in /mnt and soft link to that, I can see it on the web. So it's just the mount to the vista machine that seems to be a problem. It's supposed to be a simple read-only mount and the apache login should (I think) be able to see the same generic root access permissions.
log from apache: [Mon Apr 26 20:39:42 2010] [error] [client 99.99.99.99] Symbolic link not allowed or link target not accessible: /home/user1/pub_html/Music, referer: https://xx.xx.xx/~user1/music.html
The credentials have a login and password that matches a special read-only account on Vista. I can see the files on the system from Linux, but not via the web. As mentioned above, a different link to the same /mnt area works fine via the web. I've tried several different mount options with no success.
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Jan 18, 2011
Finally I got success in setting up of CDMA USB modem but I could not access the internet or browse the internet. I can only download message and send messages using through evolution. But can browse internet.
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Nov 8, 2010
I'm wondering why I keep getting the following in /var/log/messages on a system running the latest CentOS 5 64 bit kernel:
Nov 8 09:50:24 hostname kernel: myri10ge: eth2: link down
Nov 8 09:50:24 hostname kernel: myri10ge: eth2: link up
Nov 8 09:50:34 hostname kernel: myri10ge: eth2: link down
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Jan 15, 2011
I can't post messages, I think something is wring with my internet.Anyway, I'm gonna copy paste what I've been trying to say...I just bought the TP-LINK Model No. TL-WN821N. It's an atheros. And I was wondering where can I find the drivers for Linux. It only includes drivers for Windows.
I don't have much experience with networks,I found this website,
http:[url]......
I got stuck in the patch section, I don't know what they are trying to say. They are using
diff -urp compat-wireless-2009-02-22_AR9170_230209/drivers/net/b44.c compat-wireless-2009-02-22_AR9170_230209/drivers/net/b44.c
They are comparing the same file, there is some code they are showing but I don't know what they want me to do.
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Apr 26, 2011
I created a new account on laposte.net.
This account can receive messages but cannot send any from Thunderbird.
[url]
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Mar 11, 2010
Here the description of the issue I am having.I am writing a bash test script which reads lines from a file, builds ISO messages, sends them to a server, reads the response with response code and reports the result of the test to a file or on the screen.The message that I need to send is 94 characters long.Here's the portion of a code that I initially wrote:
#~ Open socket.
exec 3<>/dev/tcp/172.26.0.25/9991
#~ Send msg.
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Jan 10, 2010
when ever i try to install updates i get shown an error & the updates stop the error i get says "librpmio.so.0 is needed by package abrt-1.0.3-1.fc12.i686 (updates) librpm.so.0 is needed by package abrt-1.0.3-1.fc12.i686 (updates)"
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Apr 7, 2011
I am totally new to Linux and have just installed ubuntu 10.10. After configuring the network interface via dhcp I started getting these messages that come in so frequently I can't configure anything else.
[87.186415] Stack:
Why I am getting this messages and more importantly how do I get rid of them.
The installation is on a VM on Hyper-V.
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Sep 21, 2010
What does these messages in PING mean?
Code:
PING 192.25.141.248 (192.25.141.248) 56(84) bytes of data.
From 192.25.141.229: icmp_seq=1 Redirect Host(New nexthop: 192.25.141.248)
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Apr 27, 2011
[Ubuntu 10.04]Every 60 seconds, 24 hours a day, a line like the following is logged to /var/log/messages and some of the other system logs:Code:Apr 27 11:37:48 HOSTNAME kernel: [DDDDDD.DDDDDD] ================>r8192_wx_set_scan(): hwradio offThat's with the wireless card disabled (since I'm using a wired network). If the wireless card is enabled, the message changes to "hwradio on".
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Aug 7, 2011
Anyone know what tweaks are needed for above set up?
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May 29, 2010
I am looking to setup some computers as thinclients to connect to my MS Terminal Servers. We have a homebrew application that configures RDP sessions. A user logs into a webpage that dynamically generates a "launch.rdp" file. This file is generated to balance the load between servers.What I'd like to do is configure an image to boot up into Mozilla. When the user goes to the webpage, I'd like the launch.rdp file to open up in a terminal server session.I've tried with rdesktop and tsclient, but unfortunately neither would work with a "rdp" file.
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Jul 27, 2010
I'm running my newly-built minimal slackware-13.1 system and considering install X and fluxbox into it. The problem is, as a minimalist, I want just the packages that needed for X and fluxbox and no more.
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Feb 14, 2011
I have Squeeze (2.6.32-5-686) installed on sda and have an additional disk sdb.For some reason 'dmesg' gives me always this message for sda1 (after a reboot):
Feb 14 12:29:03 arkiv-x kernel: [ 448.349949] EXT3 FS on sda1, internal journal
Feb 14 12:29:03 arkiv-x kernel: [ 448.470411] loop: module loaded
Feb 14 12:29:03 arkiv-x kernel: [ 448.653327] kjournald starting. Commit interval 5 seconds
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