Networking :: Long Messages Fragment Over Network?

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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Ubuntu Networking :: VPN Interface MTU Size \ The Packets Come With The Don't Fragment Bit Set?

Feb 20, 2010

For learning purposes i've set up a vpn between a laptop (running ubuntu) and a pc (running windows). The 2 computers are on the same lan. The VPN server is set on the laptop, and as a guide i used this tutorial:The problem is that the mtu on the ppp0 interface is 1396 and the mtu on the eth0 interface is 1492 so in order to pass packets from the et0 if to the ppp0 if, the laptop needs to fragment the packets, and here is where the problem appears: the packets come with the don't fragment bit set. I've tried lowering the mtu of the eth0 if but that didn't work. The only way i managed to make this work is setting the ppp0 mtu size to 1492. The thing is that setting the mtu and mru in the pptpd-options file to 1492 doesn't do anything (at least to solve this problem) and the only way to set the mtu of the ppp0 if is to manually set it using: Code:sudo ifconfig ppp0 mtu 1492 The issue with this is that every time the connection resets i have to enter the command.

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Ubuntu Networking :: Configuring The Network Interface Via Dhcp - Network Messages - Code: 00 55 89 E5 0f 1f 44 00 00 Fa 5d C3 90 8d 74 26

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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Networking :: UBUNTU 10.04 Does Not Connect To Network With Patch Cord 100' Long?

Jan 21, 2011

I moved my UBUNTU workstation from basement to second floor and it did not connect to my home network. When moved back to basement level, it connects. Cat5 cable to second floor is 3 time longer than one used to connect in basement, almost 100feet. My Windows XP laptop has no problem in connecting to the network on the second floor using the sane cable that was used with UBUNTU.

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Ubuntu :: Menu Fragment Left Behind On Screen / Solution For This?

Oct 23, 2010

Just happened after the latest updates on MM
select applications, it loads the menu but it wont go away, pieces of it stay on the screen

solved by reinstalling the nvidia driver.

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Ubuntu Installation :: SQUASHFS Error: Unable To Read Fragment Cache Block

Apr 5, 2010

I'm trying to install Kubuntu on an old Windows system. I am getting tons of errors such as:

I/O error
SQUASHFS error:unable to read page, block XXXXXX
SQUASHFS error: unable to read fragment cache block

It then reports that it's loading ACPI modules and starting the ACPI services, starting the system log daemon, doing Wacom setup, starting kernel log daemon.....and then it reads sb_bread failed reading block umptysquat.I have a feeling that this hard drive is toast. I can't get it to install Windoze or Linux. I can't even get a prompt so I can do a low-level format. Unfortunately, I'm not super savvy with Linux and don't know what to do next.

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Ubuntu :: File System Check Failed A Long Is Being Saved /var/long/fsck/checkfs

Jan 9, 2010

just start Ubuntu 9.04 said: File system chek failed a long is beging saved /var/long/fsck/checkfs if that location is writable Please repair the file systmen manually A maintenance shell will now be started Ctr+ D terminate this shell and resume system boot. Give root password for maintenance or type Control +D to continue. I did Ctr+D , and after login said , that can not find /home. I starte with the live cd:


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OpenSUSE Network :: Can't Connect To Internet - Takes So Long To Boot

Jan 3, 2010

I use openSuse 11.xx and all was going fine until yesterday. When booting up now, I can't connect to the internet any more. I takes much longer to boot now as if openSuse tries to look for something that disappeared or got corrupt. All started with the latest safety update.

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Red Hat / Fedora :: 15 Takes A Long Time To Connect With LAN Network (Samba)?

Jun 16, 2011

The Fedora machine acts like print and file server.But the problem, its the conection time.When i start the machine with fedora, takes like five or more minutes to appear in "My network places" in the windows machines, and if the server dont appear, i cant print and browse in the server files with the windows machines.I can browse in the internal network files (Windows folders) from fedora all the time, i have internet conection and with the internal network all the time, but the server just dont appear in the network places in the windows machines when i just start the server.

I check the samba status when i start (in the terminal), and its running.And i have a control program called "Control of Ciber", this program connect with the "Slaves" terminals and the conection appear in the server, but when i just turn on the server, the machines appear offline, and they connect after the same time taken for the server to appear in "My network places" in windows.I dont know if have a relation, but i cant open the share folders of the fedora machine in the windows computers, a error dialog appear (Privileges problem), and i just cant see the files in the folder.I give administrator privileges to everyone in this particular shared folder (Chmod 775), and i put the "Security = share" in the samba file. This issues dont happen in debian or ubuntu with the same configuration

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Ubuntu :: Configuring Network Interfaces At Startup Takes Too Long?

Jul 1, 2010

It took almost one minute.How do I reduce the time?Also how do I undo the changes for update-rc.d networking defaults

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OpenSUSE Install :: Shutdown Takes Very Long Time - 2 Min - Possibly Due To Network ?

Oct 21, 2010

OS: OpenSuse 11.2 64 bit
Machine: HP 8540p i5 4Gb

Shutting down my machine takes a very long time! Not convenient when one want to pack his laptop (I don't dare to when the fan is still blowing).

Upon shutdown, I press 'esc' and see what's happening. The last commands seem to hang. First, shutting down the network interfaces seem to last long than needed (eth0, pan0, wlan0). Sometimes, it stalls also on "networkmanager disconnecting from DBUS" (or something like this ) (which is the very last command executed). Hmm, I will write the exact command down.

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Fedora :: Noisy Network Manager - Tell To Not Log So Many Messages To The System Log?

Mar 23, 2010

Is there anyway to tell NetworkManager to not log so many messages to the system log? There appears to be a bazillion <info> messages in the log file (/var/log/messages). It makes it hard to find any potential problem areas...

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OpenSUSE Network :: Sendmail - Large Messages Only Queueing?

Jun 24, 2010

I've got a strange sendmail problem I've never come across before...Messages less that 2500 lines (approx 169kb) are sent correctly - anything else goes straight into the queue and is never delivered. The server sits in a intranet, is not connected to the outside world, and forwards its mail to a smart host.All configuration has been done through yast, so there are no unusual settings. I've run sendmail on SuSE from version 6 upwards, and this is the first time I've come across this - it's driving me potty

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OpenSUSE Network :: When Disable Firewall / Delayed Messages Can Again Be Sent

Sep 14, 2011

I have been running Senmail on SuSE 11.1 for the last few years with no problems.Since installing SuSE 11.3 a few months ago I have been having problems getting Sendmail to send to some (only a few) servers.If I disable the firewall # SuSEFirewall2 stop.I can send successfully using # sendmail -v -q, or # sendmail -v -qIxxxxx.When I re-enable the firewall I will start to get the timeouts/temporarily unavailable messages again (but as mentioned above, only for some servers) even though I can successfully telnet these servers when the firewall is on. When I disable the firewall the delayed messages can again be sent.Has anybody any ideas what I need to change (presumably in the Firewall) to get things working correctly? 'SMTP with sendmail' is already selected under 'Services to Allow' under YaST Firewall->Allowed Services..

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Hardware :: Network Card - Always Makes Kernel Messages ?

Dec 16, 2008

I'm having intermittent trouble with my network card.

It always makes kernel messages like the following:


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CentOS 5 :: Sending Messages Between Local Network Machines?

Jul 3, 2010

i am using centos 5.4 (5.5?) gnome on multiple machines in a local there a program available that does the following:you type a message in a 'note'screen on one computer and can send it to one (to choose) or all machines in the local network that are online, so you can read the message on these other machines screens.

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OpenSUSE Network :: IPv6 Getting A Global Address Takes A Long Time - Possibly Only After Starting A KDE Session

Jul 8, 2011

My ISP offers the service of native IPv6. So my ADSL router provides me with a local and global IPv6 address. However after a reboot it takes minutes to finally see the global address when using "ifconfog eth0". During that time I can't do a ping6 to an external server, which seems logical. So I waited several minutes, but no global address. After that I started a KDE session, went back to the console(<Ctrl>+<Alt>+F1) and now the global address was there. Is this normal behavior or should I file bug report?

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Fedora Servers :: Setting Up Network In The Right Way + Wake On Unicast Messages?

Jul 11, 2010

I have a Fedora server at home. I don't want it to be running all the time to reduce the power usage and be more green It only works , whet it is really needed. So when it is not in use (no ssh or http connections have been active for some time), a custom python script suspends it. I have set it to wake up on unicast messages, so when somebody connects to it, the server wakes up.In Fedora 12 everything worked fine: when the server was sleeping and you connected to it using ssh or a web browser, the client waited for couple of seconds until the server was up and then connected (actually it worked even when server was turned off: the command "ssh [user]@[server]" just waited until server was booted up and then connected.)

Now I installed Fedora 13 on the server. When I try to connect to the server when it's sleeping, the client waits for some time (and server wakes up), then the connection just times out. When I try to connect again, it works. When server is up and running, I can connect to it. So when it is sleeping I have to connect twice: first to wake it up and then connect again to log in.Do you have any ideas what is causing this problem, as it is really annoying for me and I don't want to have it running all the day.Also, I have not set up the network in the best way, I think. To start the network at boot, i have put the command


ifup eth0
to /etc/rc.local.

To start the network when resurming from suspend, I have creted a script with the same command in /usr/lib64/pm-utils/sleep.d. It works, but it does not seam to be the *right* way to do this. Maybe this is also causing the first problem. So how have you managed to get a working network connection on your Fedora 13 headless server?

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OpenSUSE Network :: Firewall Sending Messages For Allowed Port?

Mar 23, 2010

In the firewall, I opened port 5900 for TCP traffic. Now the console is displaying packet information whenever a connection is made. Why does it send a message to stdout/stderr for an allowed connection? How can I stop it? Logging level is set to critical only, and not-accepted packets should only be logged for the internal and DMZ zones.

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OpenSUSE Network :: Rsync Freezes Whole Computer Without Error Messages

Feb 26, 2011

I am currently facing a problem with rsync (or maybe ssh, I don't know yet). I have daily backups that are done via cron using rsync from my computer (client) to a NAS. And systematically during these backups my computer completely freezes (no remote login possible, nothing), so I have to hard reboot. As you might imagine, I cannot do this every day. In /var/log/messages there is just a line like that :

Feb 26 17:23:53 eggplant rsyslogd: -- MARK --

right before the hang. The rsync worked well before and I don't really know what changed in my system config. In /var/log/rsyncd.log I sometimes (but not every time) I get :

2011/02/26 16:39:19 [13229] rsync error: received SIGINT, SIGTERM, or SIGHUP (code 20) at rsync.c(543) [Receiver=3.0.7]

I aldready update the default rsync from opensuse 11.3 to, but it does not help. How can I at least know what is going wrong? I am trying to track down the problem but don't know how to start. Last also a log of the rsync command (client) running ssh in verbose using the command "rsync -av --delete --timeout=180 -e "ssh -v -p xxxxxx -i /root/.ssh/rsync-key_eggplant" /mds root@xxxxxxxx:/volume1/autoBackup/eggplant":

OpenSSH_5.4p1, OpenSSL 1.0.0 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *


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OpenSUSE Network :: Stop Firewall From Writting Logs To /var/log/messages?

Jul 19, 2011

I'm running OpenSUSE 11.4. The problem is that I can set easily what to log (for firewall), but not where to log. And currently the same logs are written to /var/log/firewall and /var/log/messages. I still want messages be written into the first one, but not the second one — it is redundant and it is polluting regular system logs.So how to stop the firewall from writting logs to /var/log/messages?

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Ubuntu :: Send Messages To Computers On Same Network With Write Command

Sep 14, 2010

The write command just isn't working for me at all. Am I right in thinking it can even do this function? I am using:
write paul@paul-laptop pts/0
It keeps telling me
write: paul is not logged in on pts/0

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Networking :: How Long Before TCP Ack's Timeout

Oct 13, 2010

I'm trying to get granular with TCP, one of the answers I can't seem to find is. When a client server connection is lost without closing, how many duplicate ack's are sent until the session is closed. I've kind of figured out the the sender will continue to retransmit a segment for about 9 mins if not Ack'd. going from 1.5,3,6,12,24,48 and the continuing with 64 seconds up to around 9 minutes before is resets the session. but whats happening at the other end.?

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Programming :: Logging Messages From Program Doesn't Reach /var/log/messages?

Jul 13, 2011

I have a syslog-ng running and kernel build of 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);


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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Ubuntu Networking :: Long Latency On LAN Between 10.14 LTS Servers

Jun 8, 2011

we are setuping high-performance web farm with 4 ubuntu servers (all 10.14 LTS 64bit, i5Core CPU, 16GB Ram). One server is "database" server with mysql installed, three servers are "webservers" with tomcat installed. All three webservers have public IP and are connected directly to internet by eth0 (onboard network card) and are connected to switch that is connected to database server by eth1 (pci network card). All servers has stardard instalation with no special modules/programes installed.

Web servers are already under load, but only on about 10 requests/minute. After several hours in production, strange thing happened - one of the web servers (each time another one, so it is happening to all of them but not at once) starts to have pings to database (that is connected directly on LAN) = 100ms (other two servers still has like 0,02ms). Pings stay high until we do /etc/init.d/networking restart, after that it is fixed and pins are again low again. Another strange think is, that when we let ping running for some time, it is slowly dropping from 100ms to 1 ms and then again jumps to 100ms (exactly to 100ms always) and again starts dropping - so it is cycling over and over again (one cycle takes about 2 minutes).

We were trying reconfigure network, play with switch (the same situation was happening even without switch when there was only one webserver and one database server directly connected), disable IPv6 but nothing helped. The only thing that we discovered is that it has to be caused by network configuration.Do you have any idea what can cause it? We went through systems logs but found nothing suspicious (at least according to our understanding).

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Networking :: Long Delay In Website Loading

Apr 26, 2010

I am having a problem with internet browsing. Whenever I type the address of any webiste like Google
or URL...or any other, the firefox gives message at "Status Bar" that "Looking up" or "Looking up" etc for every website for about 20-25 seconds and than launches the website successfully. Why this is happening and how can I correct it?I also tried this in Opera and Google Chrome and same problem occurs in them.Moreover, if I ping any domain inside terminal, it instantly starts pinging (with ttl 51) and recieving data from that domain resulting that the problem is with browsers.

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Ubuntu Networking :: Long Wifi Networks Last In The Available List?

Mar 10, 2010

I was on a car trip earlier, but we were stuck in traffic. The stop-go stop-go kind of BS. I pulled out my 9.10 laptop and figured I'd scan for wifi networks and see how good America was at securing their networks. (I work in IT support so it's one of those things I preach to no end yet people rarely listen).

I was using wifi radar, and picked up a truckload of networks every time we'd stop. But something didn't sit well with me. When I click on the network manager icon in the top gnome panel to see what networks were available, it never seemed to refresh.

Example - the first 5 networks I saw were 1, 2, 3, 4, 5. We would stop-go more and more and miles later when I'd see more networks in the area show up in wifi radar, yet hit my network manager, I'd STILL see networks 1, 2, 3, 4, 5 and not 30, 31, 32, 33, etc like I expected.

What kind of refresh time or cache or whatever does network manager have? I just didn't understand why I was seeing the original networks from 15 minutes/miles ago and it never seemed to update.

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Ubuntu Networking :: My Internet Connection Has A Long Delay

Aug 9, 2010

My problem is that every time I use the Ethernet connection (I don't have wireless card) there is a delay of around 30s, even though my download speed is not affected at all once the connection is "established" , no matter what application I use (Synaptic, ssh, firefox, google chrome,wget, update manager, etc.). A weird thing is that my ethernet connection always appears as active.

I'm sure I'm not the only one who has experienced this issue, since I've read the same problem on other forums, but no one has come up with a solution. I hope that there will be a solution at last by this time.
I've been around with this problem for about 1 month, I've tried all sorts of tweaks that involve disabling ipv6 and nothing happens. I don't really know what triggered off this issue because it all started all of a sudden and I don't remember having installed any important update by the time this happened (I did a clean installation of Ubuntu 10.04 32bits on the release date).

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Ubuntu Networking :: Wireless Connection Not Stay Connected For Long

Feb 8, 2010

When I turn on the computer, it connects to wireless automatically. That's good. But it doesn't stay connected very long. Especially if I turn on a p2p program or make a call through messenger. Then I get disconnected suddenly and if I want to connect again it doesn't work anymore. Network - You are now disconnected and that's it. Every time it happens I restart the system. I use an Acer Aspire 5738z laptop.

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Ubuntu Networking :: Running Remote Programs For A Long Time?

Mar 14, 2010

I suspect this has been posted before, but I'm new enough to the OS to lack the proper vocab for a proper search.

In any case, I'm basically trying to run programs remotely at work (from home) that will run for a long time. I first ssh into the appropriate network, then ssh into the individual machine. This works great and I can run programs no problem. The issue is that these programs can run for days or weeks, and the network kicks me out after some period of time due to inactivity.

Is there a way to start a program on a remote machine then terminate the connection but have it keep running?

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