CentOS 5 Networking :: UDP Errors - Change UDP Buffer Size?
Mar 27, 2009
I think i've discoverd an issue on our linux servers. We have developed an in house application that send and recieves a large volume of udp data. I'm see alot of errors for udp when I run a "netstat -us". Could the recieve buffer be too small and if so, how do it change it. What is the default size on centos 5?
kernal = 2.6.18-53.1.14.el5PAE #1 SMP Wed Mar 5 12:07:47 EST 2008 i686 i686 i386 GNU/Linux
"netstat -us" output
Udp:
197961014 packets received
1474 packets to unknown port received.
49340800 packet receive errors
25890918 packets sent
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Jan 21, 2010
We know that, in a network, data transfer time is dependent on capacity of the receiving node. I have two Linux systems A (sender) and B (receiver) connected. I want to simulate congetion in a network, that means I want to increse the time taken to transfer some data. I believe, I can do this if I can reduce the capacity of the receiver node B. That perhaps possible by decreasing the receiving buffer size of B. How can I change the receiving buffer size of this linux system B?
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Aug 30, 2010
Howto check a hard disk for Buffer I/O Errors and fix them using linux Live CD, without damaging OS?
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Sep 15, 2010
I'm using CentOS 5.4 servers installed in a VMWare virtual machine with no X.Org server installed, so all access is via command line and the linux terminal. I use Shift-PgUp to view the scrollback buffer, but its size is very limited. How do I increase the size of the scrollback buffer?
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Oct 22, 2015
today I upgraded via official testing repository Gnome to version 3.18. After this, icons on desktop and nautilus are bigger, than before. Next thing, gaps between icons are smaller than before. I tried change theme to default (Adwaita), then run gtk-update-icon-cache, but without result.
Normal view - icons are big for this view. URL....
Small view - icons are still big for this view. URL...
How can I change icons size and gaps size? Or is it bug for this version?
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Sep 9, 2009
How to figure out why there are errors on bond0(eth0)
Transfer speed is in KB
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Jul 24, 2009
I've got an odd one, running the CentOS 5.3 kernel, I'm experiencing lost packets on one of the two NICs when tested with ping. In this particular case, it's the internal NIC that causes the problem, pings from the CentOS machine to the public network over the external NIC never loses packets.(internet)<-->CentOS<--> (LAN) <--> desktop
- CentOS can ping the internet with no packet loss
- CentOS loses packets when pinging the desktop(s)
- Desktops lose packets when pinging the CentOS box
- Taking the LAN switch out of the equation still results in lost packets
- When the LAN NIC on the CentOS box "acts up", all desktops start losing packets
I've swapped out the NIC a few times for different makes/models, and I'm still getting lost packets to/from the internal network. So, I'm thinking that there's something squirrely going on higher up in the network stack. But evidently, not enough to log anything to the console or into the log files.At the moment, I'm leaning towards it being an issue with the nForce 750a SLI chipset. But it's odd that it only affects the LAN card and not the WAN card. I've even swapped the positions of the two NICs, and the problem persists on the LAN card.The other possibility is that iptables is eating packets silently, but in a random fashion.
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Aug 22, 2010
Anyone know how to send output to buffer via putty? Currently I am using vim with windows copy menu, very slow and tedious.
I download xclip but i got the following error:
Quote:cat ../mnt/fs1/tmp/rcentre01.log|xclip
Error: Can't open display: (null)
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May 20, 2009
I had installed the CENT OS 5.3 it is installed when i rebooted it gives me error continuously.
Buffer I/O Error on device sda, Logical Block 0
ata4.00 : exception Emask 0x0 SAct 0x0 action 0x0 frozen ......
ata4.00 : status: { DRDY }
why it has giving the error.i have Intel based hardware Core II Duo with 1 GB ram check with sata hard drive 120 GB.
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Sep 4, 2009
I just downloaded an iso of the latest CentOS dist (5.3) and burned it to disk. I booted from the CD and received the following error:
Memory for crash kernel (0x0 to 0x0) not within permissible range
Illegal mode for this track or incompatible medium -- (asc=0x64, ascq-0x00)
The failed "read 10" packet command was:
Buffer I/O error on device hdd, logical block 176935
(This error message repeats for another 9 or 10 times then it says the following)
Red Hat nash version 5.1.19.6 starting
Setting up new root fs
(Then there are some unmounts which are old /dev, /proc, /sys. At this point a series of steps begin).
Setting Clock
Starting udev
Loading default keymap (us)
Setting hostname local host.localdomain
Setting up logical volume management
Checking file systems
These are just some of the steps that appear after the above error is displayed, all of the steps that load have an ok status. After those are completed I get to a text prompt - localhost login: At this point my keyboard does not seem to respond, pressing enter or any of the other keys seems to have no effect. I noticed that during the load process I could toggle the light for caps and num lock, but at the login screen it does'nt work. So at this point I'm not sure if I'm having a technical issue or if its just another case of an user error.
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Feb 23, 2009
I am using FC10 and recently there has been an error for ssh or telnet "No buffer space available". I rebooted the machine
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Jun 8, 2010
I have configured pppoe connection via NetworkManager through key-file plugin. The problem is that after a while i cant load any web page. All connections r up, nothing bad in /var/log/messages. Ping produce mystical error message:
Code:
sendmsg: no buffer space available
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Mar 29, 2011
where packets are stored when they're received. After some googling, I think perhaps libpcap with mmap would be the solution. Does libpcap 1.0 and above support mmap?From my understanding, mmap would allow me to directly access the buffer without having to explicitly copy the packet to another buffer for me to do processing. I would also appreciate it if someone can let me know where I can find examples of such applications, as many examples of mmap I've found involves mapping a buffer for file operations, rather than integrating it with pcap functions like pcap_loop, pcap_next_ex etc.
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Jun 24, 2009
I try to set up a 5 nodes cluster and a shared Coraid Storage with conga but it fails with "Shared Storage Support" checked.The message is:'A problem occurred when installing packages: Packages of set "Clustered Storage" are not present in available repository' and it is shown under every node on the next sceen after I submit.The pc where conga runs is on the same subnet (192.168.xxx.xxx) and it has the same /etc/hosts of the other nodes.In that pc runs a proxy too and the nodes go out through it (that pc has 2 NICs)Every node (2.6.18-128.1.14.el5-xen-x86_64) is patched whith the last yum update (this morning) the same is for the pc (2.6.18-128.1.14.el5).Every node has 4 NICs , 2 NICc towards the storage the others in bonding towards the WAN.Every node is exactly alike, they have been installed with the ks.cfg generated from the first node and they all have the support for Clustering, Virtualization, and Clustered Storage.
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Jan 26, 2010
I'm using OpenVPN 2.1 on Ubuntu 8.10 to connect to LAN behind an IPCOP server. Everything works fine except when I move across the tunnel files which are over 180kb, then I get UDPv4 []: No buffer space available (code=105 surfing the Internet I've found post that suggest to increase these settings on the kernel
> sysctl -w net.core.rmem-max=8388608
> sysctl -w net.core.wmem-max=8388608
> sysctl -w net.core.rmem-default=65536
> sysctl -w net.core.wmem-default=65536
those have actually made a small difference, but not enough for uploading even an image over http. I guess that I can keep increasing those values till I'm not satisfied, but as I'm not sure on what I am dealing with, can anyone tell me if there's a rule of thumb? My machine is a laptop with a dual core processor and 2GB ram.
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Feb 23, 2009
I'm researching about symbolic links been used with samba / CIFS:I'd like that the user that uses a MS-Windows OS could see my shared folder on CentOS 5 and the symbolic links that are inside this folder. Well, it works but, the user will see that the size of the file is bigger than the real file. Apparently, CIFS gets the size of the symbolic link (aproxim.32K) and add it to the size of the file.Example 1: 100KB file, used with shared folder, MS-Windows's user will see 100KBExample 2: 100KB file, used with symbolic link inside a shared folder, MS-Windows's user will see 132KB. (Sym link + size of file)Is there a way to allow the user only see the size of the file, and not the file + symbolic links ?
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Dec 11, 2009
I need to change my lan card orderI have 3 lan cards eth0, eth1, eth2and I need my current eth2 as my primary lan card
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Sep 21, 2010
I have been installing CentOS 5.5 on a VirtualBox virtual machine using the netinstall iso (leaving almost all options on default).It automatically obtained addresses of the nameserver the host machine was using. However shortly before the installation would have finished the nameserver went down and the installer started giving error "file ... cannot be opened".
After changing the nameserver address (to Google DNS 8.8.8.8) in /etc/resolv.conf , addresses can be resolved again (wget, ping) but the installer still gives the same error and attempts to connect to the original DNS.It there a way to tell the installer about the DNS change and resume installation? Or do I have to either wait for the original DNS or to do the whole installation again?
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May 7, 2009
Centos 5.3 How can I change the primary nic from eth1 to eth0? My board has 2 nic's and I'm having license issues with cpanel
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Jul 26, 2011
I am using centOS 5.0. After I change from DHCP to static IP address, I cannot ping hosts on the same subnet. The error message says destination host unreachable. Before I made the changes I was able to ping and now even I change it back to DHCP I still cannot ping with the same destination host unreachable message. The centOS is running on VMware on a Windows host.
ifconfig shows
eth0 Link encap:Ethernet HWaddr 00:0C29:A1:9A:10
inet addr: 192.168.0.202 Bcast:192.168.0.255 Mask: 255.255.255.0
inet6 addr ......
After pinging 192.168.0.106 (106 is on and other host can ping it), arp -a shows ? (192.168.0.106) at <incomplete> on eth0 I tried different ways by disabling the firewall and and disabling SE protection. No Luck.
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Dec 14, 2010
I am looking for a way via script to change a systems hostname and IP address!
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Jul 2, 2010
I need to know how to change the default size of /dev/shm on a 9.10 box. In previous versions this was controlled by the value in /etc/defaults/tmpfs but this no longer works. What is the correct method to change the default size?
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Sep 24, 2015
I have setup a samba Active Directory PDC to essentially eliminate the cost of using a Windows PDC. There are other reasons but I won't go into those now.
So everything works fine apart from a couple of things that are bugs in samba until 4.2 which isn't stable yet on debian (so I read).
The one thing that doesn't work is users trying to change their passwords. I can change them from either the PDC or through Windows users and groups. If a user tries to change it they will get the message:
"Mutual Authentication Failed. The server's password is out of date at the domain controller".
The packages I have installed and configured are:
samba
smbclient
smbldap-tools
ntp
krb5-user
krb5-admin-server
winbind
I provisioned the domain using samba-tool domain provision, i have configured kerberos and users can log in fine....it is simply changing passwords that are the issue. I am not sure if this is a samba config issue or where it is. I would hate to have to fall back to a Windows PDC.
Below is my samba config, the [domain] is of course an actual domain on the server.
Samba Config:
# Global parameters
[global]
workgroup = [domain short]
realm =[domain]
netbios name = BILBO
server role = active directory domain controller
[Code] .....
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Apr 21, 2010
I want to make a new partion,my home is /dev/hda9,so I use the Partion Editor(Gparted) ,frist umount the device(umount -l /dev/hda9),then change the size,everyone thing works well until I clicked the Apply,the error occurred:
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Nov 5, 2009
I'm a student in a linux class and we just installed fedora. so far it's nice except that the work we do is in the CLI which I can barely see because it's so small on the screen! I've been squinting at the screen for a little while now but it's just proving to give me more of a headache and hurt my eyes than anything. Anyone know how to change the font size so that I can actually see the work I'm doing?
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Nov 16, 2009
I'm running OpenSUSE 11.2 on my Acer Aspire One with a 9 inch LCD. I have configured the monitor in Sax2 to reflect the size and 1024x600 resolution, and as a result the desktop fonts are all sized correctly.
However, the fonts on the KDM log-in screen are too large, and I'd like to reduce them if possible. Looking in the KDE Control Center, I tried using the Login Manager utility to adjust the KDM theme, but any changes I made seemed to have no effect i.e. changing the font size, or even the overall theme itself, still resulted in KDM using the default green OpenSUSE theme with large fonts.
Does anyone know, therefore, how to adjust the KDM font size or DPI in OpenSUSE 11.2?
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Jul 20, 2011
(I hope I am not repeating myself here, as I have tried to send this before but don't see the post): I now have upgraded to Suse 11.4 and I can't find how to set the console settings. It fills the whole screen, and the font is tiny. I am able to enlarge the font, but not to change the window size. Under 11.2, I was able to set the font, and an 80 characters per line, 40 lines window, and then make all that permanent.
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Jan 19, 2011
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Feb 26, 2011
I have gparted but can't change my ubuntu partition.
I guess that's because I can't unmount it. And... I guess my Ubuntu won't work if I unmount it? xD
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The only problem is that I can't boot from a cd/dvd drive.
So, is there a option to change the partition size while running Ubuntu?
Or is there a option to somehow unlock all BIOS settings?
When I try to acess the BIOS settings it ask for a password, and I just press enter... And I come to a menu where I can't change anything. Is this because of wrong password? Or is the password right but everything is blocked?
I mean, I can't change boot priotiy to cd/dvd just HDD and LAN.
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Apr 30, 2011
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