Ubuntu Networking :: Long Pauses At Start Of Pings And Http; MTU Related?

Mar 29, 2010

Brand new network, just installed, all ubuntu 9.10 boxes connected to a Dell 2206 dumb gigabit switch, and from there to Dlink router to cable modem. Pretty simple. ISP confirms great link out and inbound,

However, http requests can sit for 20-30 seconds (sometimes longer), before content returns, same for pings.

Some thought it might be MTU-related. What is best MTU setting 1500/1492/ ?

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Ubuntu :: Long Pauses Between Copying Big Files?

Nov 30, 2010

when i try to copy more than one files of average size of around 300MB, ubuntu copy one file then data transfer stops for some time, and then after it continues and again stops on the end of file?? i didnot faced this problem while copying data to my external hard drive.

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Ubuntu :: Inexplicably Long Pauses When Moving Files?

Mar 31, 2011

I'm wondering what might be causing some VERY long delays when I move groups of files from one directory to another on the same drive. In the GUI, I simply multi(shift)select a few dozen items at once (a set of JPEGs previously downloaded from my camera) and drag them together from the source directory window (where I downloaded all the images from the memory card) into a new/empty folder/window specific to that group of images. Just routine sorting of files basically... Once I 'let go' ('dropping' the items into their destination) there's often a SURPRISINGLY long delay before I can do something else within the GUI... open another file, or rename an item, etc... This delay can take a few seconds to more than a minute (if moving a couple hundred files at once)... this 'wait' during such a routine 'housekeeping' task seems surprising to me. During these delays, I CAN open/use other programs such as System Monitor or a browser... it just seems that additional GUI/filesystem tasks must wait out the delay before proceeding. If I go ahead and try to do another filesystem task during the delay anyway, it gets buffered... the file won't open/next files don't get moved/etc... UNTIL the delay from the first operation is complete (updated item counts resulting from file moves aren't reflected in List View until the delay is finished too).

According to System Monitor (see image attachment for screen cap during one of these delays...) one CPU is pegged (the "gvfsd-metadata" process, which I guess corresponds to the file/move) and the other 3 cores are relatively idle, and there's plenty of free RAM/no swap. I'd have thought such a delay wouldn't be an issue with Ubuntu/my PC... maybe I have something set up incorrectly? Other clues: intermittently, during these delays/file operations, the GUI shuts down all open windows (folders)... as if the delays/buffered tasks caused some sort of reset. The hard drive is internal SATA formatted regular Ext4 and the Ubuntu on my PC is the 32-bit version since I figured my Dell is too old (about 4-5 years) to justify the 64-bit version. Like most folks, there are LOTS of files/folders on my drives, but I only have 3 file windows open at once most of the time, and am only displaying the item names and 'sizes'... no other columns. Nothing other than the 'move' itself is running at the time which could help explain the delay.

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Debian Configuration :: Massive Delay Between Pings Yet Pings Fine

Aug 16, 2010

I have just installed a testing net install of squeeze on my laptop and I'm having a few problems with my wired connection.

When i try to ping google.co.uk there is a large delay between each result even through the actual ping takes ~30ms. It takes about 5 seconds or more between each ping.

If i use ping -n it works fine. Does anyone know why this is happening?

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Ubuntu Networking :: IP Address - No Responses Received For Pings

Aug 6, 2010

I am having (seemingly) random trouble with my wired network ever since I installed Lucid. I have no problem getting an ip address from dhcp. However, randomly the computer will boot and although I have an ip address I do not receive any responses for pings on the network nor can I browse the web. If I sudo /etc/init.d/networking restart a few times (or reboot) it will start working. However, restarting the networking services (as mentioned above) again will cause me to no longer receive responses for pings or browse the web.

Furthermore, I have never been able to successfully ping if I manually set an ip address. I have un-installed network manager and I am using /etc/network/interfaces to configure the network. Using Lucid Lynx 64bit on a Dell Precision. I have pasted below the output of a few working commands. When I switch between static ip and dhcp I am commenting/uncommenting the lines shown in /etc/network/interfaces.

sudo lshw -c network
description: Ethernet interface
product: NetXtreme BCM5754 Gigabit Ethernet PCI Express
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:08:00.0
logical name: eth0
version: 02
serial: 00:23:ae:99:4a:85
size: 100MB/s
capacity: 1GB/s
width: 64 bits
clock: 33MHz
capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.102 duplex=full firmware=5754-v3.24 ip= latency=0 link=yes multicast=yes port=twisted pair speed=100MB/s
resources: irq:78 memory:f7cf0000-f7cfffff

cat /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
#iface eth0 inet static
iface eth0 inet dhcp

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Ubuntu Networking :: Strange Behavior With Pings From Desktop?

Mar 9, 2011

I've been trying to use MySQL in Ubuntu but I've been having some connection issues and in trying to troubleshoot that, I observed this strange behavior with pings in Ubuntu Desktops inside our network.

- All Ubuntu Servers we have (10.10 and 8.04) behave as expected
- All Windows machines behave as expected
- All 5 Ubuntu Desktops we have, (10.10 and 9.10) exhibit the following unexpected behavior:

If they have a local ip addresses and are connected within the internal network, either to a switch or directly to a router, pings take much longer to be sent. It's not a higher lag, it's the time between each ping that increases. I have to wait for around 5 seconds for each ping, but the time in the ping reply is less than 100ms, also they're all in order so I assume it's the system delaying the sending of each ping.

If I plug a USB 3G modem directly then it works as expected again (~1 sec between each ping sent). Is this an intended feature, that depends on the network environment, or is this something I should look into more closely?

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Networking :: Craft A Valid Http/1.1 Request For Getting Http Headers (not The Html File Itself)

Sep 27, 2010

Using netcat, nc(1), craft a valid http/1.1 request for getting http headers (not the html file itself!) for the main index page of www dot aalto dot fi. What request method did you use? Which headers did you need to send to the server? What was the status code for the request? Which headers did the server return? Explain the purpose of each header.

nc -v www dot aalto dot fi 8080
host: www dot aalto dot fi
And it returns:
200 OK
Content-Length: 858
Content-Type: text/html
Last-Modified: Thu, 02 Sep 2010 12:46:01 GMT

I really don't know what does it mean. Question 2: Using netcat, nc(1), start a bogus web server listening on the loopback interface port 8080. Verify with netstat(, that the server really is listening where it should be. Direct your browser to the bogus server and capture the User-Agent: header "Direct your browser to the bogus server and capture the User-Agent: header" I don't understand this question.

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Networking :: OpenVPN Connects But No Replies To Pings

Jan 7, 2011

I have an asus router running tomato firmware. Through the webGUI I have set up an openVPN server as per the tomato guides. I am using the network manager plug-in in ubuntu 10.04 to connect as a client to the tomato openVPN. All of my certificates seem to be set up and working correctly.

I am able to successfully connect to the openVPN server using the ubuntu client but after that I get nothing. On the client side I am unable to ping the router, any ip addresses inside my private network, the virtual network ip, and web browsing (client) no longer works.

Also, when connected I am unable to ping the client from the private network.

Before connecting

chris@ChrisLaptop:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:1e:68:90:5e:e9
RX packets:0 errors:0 dropped:0 overruns:0 frame:0


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Networking :: Pinging Multiple Interfaces - Getting Pings From Eth0 But Not From Eth1?

Feb 26, 2011

I have two network interfaces and their entries are shown as eth0 and eth1... I want to assign them static IPs which I do by

ifconfig eth0 netmask up
ifconfig eth1 netmask up

But I am not sure if it will ping both the interfaces if I issue a command

ping -I eth0 (machine in network)
ping -I eth1 (machine in network)

I am getting pings from eth0 but not from eth1

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General :: Networking - Doesn't Respond To Pings - View The Arp Cache Table?

Jan 20, 2011

I have a Slackware 13.0 server that is not replying to icmp pings. However, I have double checked that /proc/sys/net/ipv4/icmp_echo_ignore_all is set to 0. The weird thing is I can run nc -v slackware 22 from any computer on my lan and the banner comes up just fine. The nic is on the same netmask and broadcast as all the other computers on my lan. I can log into it as well, it just doesn't respond to pings. I can even ping other computers and get replies just fine when pinging from inside the Slackware server.

I have even added an iptables INPUT rule for -p icmp -j ACCEPT. Although I've never had to do this. I ran tcpdump -vv icmp and I can see ping requests coming into the computer, however slackware simply doesn't respond. What could be causing this? A corrupt arp cache? It's been happening for more than a few hours so I wouldn't think so. How can I view the arp cache table? How do I clear it?

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Ubuntu :: Taking A Long Time To Start Up Programs?

Jan 3, 2011

I don't know if it is just me but it seems like Ubuntu takes a long time to start up programs. For example, it takes me 10 seconds to start up "Ubuntu software center". My computer is a relatively fast one. It has 4 gb of ram and an intel core duo processor. I didn't install that many programs. Does anyone know what might be the source of the problem and how to fix it?

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General :: Vim Takes Long Time To Start ?

Feb 23, 2010

I'm having trouble with Vim in any terminal emulator I use. I have a link (vi) to vim. Occasionally it will take very long to load, whether I use 'vi' or 'vi file'. Before, if I could I would restart X, and then it would load instantly again, but I waited this time and it did load, after a minute or so. Is this a problem with X or vim?

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Server :: Apache Response "HTTP Request Sent; Waiting For Response" Too Long

Jul 19, 2011

when I try to access any page even small html pages it stays like 3 seconds in HTTP request sent; waiting for response. state..even when I use Lynx locally on the server..bypassing any possible network issues..logs dont show a thing..the server itself is a high end server with nothing running on it apart from apache which is not serving anny clients now, firewall is disabled and hostnamelookups are set to OFF.

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CentOS 5 :: Sendmail Takes Too Long To Start During Boot

Dec 28, 2010

It takes a few minutes to start during boot and I just did a fresh install in a virtual machine. Haven't touched sendmail so it has default config. Someone told me it could be a DNS issue, but I can do DNS lookups and navigate the web well.

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Networking :: Major Failure On Part Of Ubuntu Related To Networking / Fix It?

Mar 31, 2010

After deleting part of the gnome config directories in order to reset gnome (GUI was messed up - No title bars, etc). I lost my bluetooth tethering to my Nokia N900. I cannot redo it as it always fails. Linking from phone to Laptop works, but cannot use it to link up to the internet then. Cable to the phone always worked up till now. Now I cannot get a connection as it stopped working after my upgrade to 11.04.

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OpenSUSE :: Why Does Konqueror Need Every Website To Start With Http

Mar 9, 2010

I've grown accustomed to using konqueror, and i like it's speed. Firefox on kde is slightly sluggish and consumes much more memory.If i type a website address in konqueror, for example, Google, it comes up with an error message. It expects me to put in Google.Is there any way to make this default in konqueror? For example, in firefox i just type in google or Google.

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Server :: HTTP Service Failed To Start

Mar 31, 2010

i am using RHEL5 at VirtualBox,at the time of installation i did create two partition one for / and another for swap.Now my /var directory is taking too much space and i decided to create a new partition with required size and mount that partition to /var.Now http service wont start and i did not reboot yet.

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Debian Multimedia :: Xfce Takes A Long Time To Start?

Feb 6, 2010

When I log into an Xfce session, the splash screen indicates the "starting window manager" step with a busy cursor for about 10 seconds or more. Mind you this is a 2.8 GHz Core 2 Duo machine.I have tried logging out, mv-ing ~/.config/xfce4 from a tty console, and logging back in, but the problem persists.I am running Xfce from squeeze.

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Networking :: Server On Multiple VLANs Server Not Responding To Pings From Non-local Subnets?

Jul 14, 2010

I've got a machine running Ubuntu Server that is on several VLANs. Each VLAN has its own subnet and the server has an address on each subnet. The switches are set to allow tagged traffic to the server for each VLAN that it is on. Switch ports ending with workstations are given untagged ports on whatever VLAN is appropriate. Workstations are given addresses on a subnet for each VLAN via DHCP. All this works great and hosts on any subnet/VLAN can access the server as normal via its address on that subnet/VLAN.

Accessing the machine by its address on a non-local subnet is where I run into a problem. Inter-subnet traffic has to go through a router, which has been set up appropriately. Running tcpdump on the server and pinging it from a workstation on a subnet, using its address on a different subnet, shows the server receives the ping, but sends no response:

sudo tcpdump -i vlan4 -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode


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Fedora Servers :: Asterisk Mini Http How Start

Jun 6, 2010

I have fedora 13, and installed asterisk.. Before I had centos and have my asterisk running to test and learn.. but in fedora I see there is a http miniserver for admin asterisk..I edited enable, port and ip in the file http.con but when I try URL...I got 404 page no found Asterisk server.

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Server :: Fedora - How To Start Asterisk Mini Http

Jun 6, 2010

I have fedora 13, and installed asterisk.. Before I had centos and have my asterisk running to test and learn.. but in fedora I see there is a http miniserver for admin asterisk..

I edited enable, port and ip in the file http.con but when I try [url] I got 404 page no found Asterisk server...

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Server :: Start Download Files Through Http Protocol With Apache 2?

Jul 2, 2010

I'd like to permit to start download file when I click over some links. How can I to start download files through http protocol with apache 2?

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Networking :: Using ESTABLISHED And RELATED Together Seems Dangerous

Apr 16, 2011

I've seen packets coming to my computer through a DD-WRTv24s2 gateway above port 32K several times. I have iptables (using fwbuilder locally) both places. My desktop stops the packets. But I'm guessing the problem is as I described in the title for this post. Yes?If you ESTABLISH a connection to some webpage, and you just accept ESTABLISHED or RELATED datagrams in rule 1 of your iptables, what will keep incoming TCP from that (presumably nefarious) site from going straight to your desktop like the building firewall isn't there?? If the site wants to connect to you above 32k, or portscan you, its RELATED correct? They know your IP. You've ESTABLISHED a connection.If my guess is correct, it would seem wiser to NEVER use these together. Better to ACCEPT all ESTABLISHED. And if something is RELATED, then ACCEPT it only if its the data connection on FTP or individually by service or protocol.

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Networking :: Scp Stall Related To Tcp Sack?

Nov 22, 2010

Trying to debug a network issue - we have problems with scp transfers to a remote host intermittently stalling. I believe it may have something to do with incorrect handling of sack / dsack TCP options. Looking at netstat -s, during a (successful) scp transfer the TCPSACKDiscard and TCPDSACKIgnoredNoUndo counters increase rapidly. This is on the client initiating the transfer to the remote server. This doesn't seem normal, but I'm having difficulty finding an explanation of what exactly these counters signify. The tcp_sack / tcp_dsack / tcp_fack options are enabled in the kernel on both hosts.

How do I debug this further? Are the counters a symptom of a known problem? It's kind of hard to google this, all I get is unrelated netstat output which happens to include 1 or 2 discarded SACKs, not tens of thousands like I am seeing. I can make tcpdumps on the client (unfortunately not the server), but what should I look for?

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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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Fedora Servers :: Cannot Start Apache - No Read / Write Access To HTTP Files

Jan 14, 2009

I am trying to setup my webserver and I am trying to make a website to run under suexec but somehow I cannot start my apache it directly fails and SELinux is giving me errors and don't really know what to do with it, it is giving me some command to type but not sure if this will make my server less secure. The SELinux error is as follow:

SELinux prevented httpd reading and writing access to http files.

Detailed Description:
SELinux prevented httpd reading and writing access to http files. Ordinarily httpd is allowed full access to all files labeled with http file context. This machine has a tightened security policy with the httpd_unified turned off, this requires explicit labeling of all files. If a file is a cgi script it needs to be labeled with httpd_TYPE_script_exec_t in order to be executed. If it is read-only content, it needs to be labeled httpd_TYPE_content_t, it is writable content. it needs to be labeled httpd_TYPE_script_rw_t or httpd_TYPE_script_ra_t. You can use the chcon command to change these contexts. Please refer to the man page "man httpd_selinux" or FAQ [URL] "TYPE" refers to one of "sys", "user" or "staff" or potentially other script types.

Allowing Access:
Changing the "httpd_unified" boolean to true will allow this access: "setsebool
-P httpd_unified=1"

Fix Command:
setsebool -P httpd_unified=1

I will write down how I did setup my server so maybe you can see a mistake I did. First I changed my Apache httpd.conf I added the following to it:
ServerName localhost
DocumentRoot /var/www/html
DirectoryIndex index.html index.html index.shtml index.php

SuexecUserGroup ulyaoth ulyaoth
ServerAdmin webmaster@ulyaoth.org
ServerName test.ulyaoth.org
DocumentRoot /var/www/ulyaoth/www/html
ErrorLog /var/www/ulyaoth/logs/error_log
CustomLog /var/www/ulyaoth/logs/access_log common
DirectoryIndex index.html index.htm index.shtml index.php
ScriptAlias /cgi-bin/ /var/www/ulyaoth/www/cgi-bin/
<Directory /var/www/ulyaoth/www/cgi-bin/>
AllowOverride none
Order allow,deny
Allow from all
Options +execCGI
AddHandler cgi-script .cgi .pl

Then I created the username "ulyaoth" with the group "ulyaoth" as I specified with my suexec, then I created all the directories as specified in my httpd.conf and "chown ulyaoth:ulyaoth (dirname)" them to the right group and username.

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Ubuntu Servers :: Nagios On 10.04 Server Using Apt-get - HTTP WARNING: HTTP/1.1 404 Not Found

Aug 4, 2010

I installed Nagios on my Ubuntu 10.04 server using apt-get and when I accessed the web console, everything was OK. I made some changes to apache (creating some new virtual sites) and since then Nagios gives me a warning message for HTTP with the message, HTTP WARNING: HTTP/1.1 404 Not Found. The sites that I created are working perfectly. I noticed that the attemps are 4/4. Does this need to be reset or does Nagios automatically reset that once it detects the issue is resolved?

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Networking :: Report Bug Related To Networking?

Jul 26, 2010

There is a major problem - networking does not work at all for me in this setup with the new kernel.I use Debian distro on this notebook.I don't have previous experience with submitting a kernel bug and would like to learn how to do it to be able to help the community. There is a tool called reportbug in debian, but it is too much automated, I think - it automatically fills in the kernel version I booted to right now, but I need to report bug to different kernel version, in which networking does not work

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CentOS 5 Networking :: Kernel Panicsystem Lock Perhaps Related To Wireless 4965 5.2

Feb 18, 2009

I've only used Linux for about a year or two now and have worked through suspend esume and WPA wireless issues with CentOS and my T61p. However, I'm stumped on this one. why my T61p freezes randomly (happened once while writing this topic) with the caps lock light blinking. I'm wondering if it has something to do with my nVidia driversettings andor using my wireless card and/or switching between home wwireless and work wwired connection.


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Server :: Install Red Hat New Cluster - Error: Cman Not Started: Cannot Start, Cluster Name Is Too Long

Mar 15, 2011

I'm having a very strange problem with red hat cluster. After testing it in the lab, I tried to install a new cluster and received the following error: cman not started: Cannot start, cluster name is too long or other CCS error /usr/sbin/cman_tool: aisexec daemon didn't start I've checked the internet for that error, but nothing. I decided to to take the example from cluster.conf man, which looks like that :


And still I get the same error. I can find my servers both from DNS (FQDN and short name) and they also appear in /etc/hosts.

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