Since upgrading a CentOS 6.4 with a SuperMicro X8SIE-F/X9SCL board with Intel 82574L NIC to 2.6.32-431.el6.x86_64 and rebooting, I have been having consistent NIC failures where the NIC shuts down permanently until a soft reboot is performed.

Type the following commands to get more info about error

# cat /var/log/messages | grep eth1
kernel: NETDEV WATCHDOG: eth1 (e1000e): transmit queue 0 timed out
kernel: e1000e 0000:02:00.0: eth1: Reset adapter unexpectedly
kernel: e1000e 0000:02:00.0: eth1: Timesync Tx Control register not set as expected
kernel: e1000e 0000:02:00.0: eth1: Timesync Tx Control register not set as expected
kernel: e1000e 0000:02:00.0: eth1: Timesync Tx Control register not set as expected
kernel: ADDRCONF(NETDEV_UP): eth1: link is not ready

# uname -a
Linux svr.lifelinux.com 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

# ethtool -i eth0
driver: e1000e
version: 2.3.2-k
firmware-version: 0.13-4
bus-info: 0000:00:19.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no

# dmidecode --type baseboard
SMBIOS 2.7 present.

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
        Manufacturer: Supermicro
        Product Name: X9SCL/X9SCM
        Version: 1.11A
        Serial Number: ZM2BS41603
        Asset Tag: To be filled by O.E.M.
        Features:
                Board is a hosting board
                Board is replaceable
        Location In Chassis: To be filled by O.E.M.
        Chassis Handle: 0x0003
        Type: Motherboard
        Contained Object Handles: 0

I found the following conversations on the net, exactly the same situation:

https://bugzilla.redhat.com/show_bug.cgi?id=625776
https://lkml.org/lkml/2012/3/17/48
http://lists.centos.org/pipermail/centos/2011-September/118027.html
http://sourceforge.net/p/e1000/bugs/358/

A quick step to fix this problem

Step 1. Login SSH as root

Step 2. Add pcie_aspm=off kernel parameters to grub config

# cd /boot/grub
# vi grub.conf

Find and add “pcie_aspm=off” at the end of the kernel parameters

default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.32-431.el6.x86_64)
        root (hd0,0)
        kernel /vmlinuz-2.6.32-431.el6.x86_64 ro root=/dev/mapper/vg_host10588-lv_root nomodeset rd_NO_LUKS rd_MD_UUID=083ae648:88342690:2c5c8edb:4af053ee rd_LVM_LV=vg_host10588/lv_root SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_MD_UUID=8263fd2d:c008be86:08ead055:2b929ecf rd_LVM_LV=vg_host10588/lv_swap  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM LANG=en_US.UTF-8 rhgb quiet pcie_aspm=off
        initrd /initramfs-2.6.32-431.el6.x86_64.img

Step 3. Save and reboot

# shutdown -r now

The post How To Fix NIC Link is Down On Centos 6.5 After Upgrade appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

SSG550M is a purpose-built, modular security platform that delivers 1+ Gbps of firewall traffic and 600 Mbps of IPSec VPN for large branch, regional offices and enterprises. If you ever forget your password and lose access to your SSG firewall then in this article, I will show you How to recover password Juniper SSG 550 using serial number step by step.
NOTE: You will be notified that you will lose your configuration and all your settings.

Step 1. Connect to the device with a console connection.
Step 2. Log into the firewall using the device’s serial number as both the username and password. The following shows a typical serial number login and the resulting messages.

login: 00442421012308289
password:

Step 3. A warning message will display, requesting confirmation to continue with the process. Enter “y”

!!! Lost Password Reset !!! You have initiated a command to reset the device to
factory defaults, clearing all current configuration and settings. Would you like
to continue? y/[n] y

Step 4. A reconfirmation message displays. Again, enter ” y “. The firewall will reboot.

!! Reconfirm Lost Password Reset !! If you continue, the entire
configuration of the device will be erased. In addition, a permanent
counter will be incremented to signify that this device has been reset.
This is your last chance to cancel this command. If you proceed, the
device will return to factory default configuration, which is: System IP:
192.168.1.1; username: netscreen, password: netscreen. Would you like to
continue? y/[n] y

Step 5. Upon reboot, the configuration is set back to factory default. The login for both the username and password is reset to “netscreen”.

The post How To Recover Password Juniper SSG 550 Using Serial Number appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

Wowza Media Server 3 is the high-performance, high-value unified streaming media and video software for any screen. For live or on-demand streaming to computers, mobile devices and IPTV/OTT endpoints, the Wowza® platform delivers superior features, benefits and functionality. This tutorial shows how I can install Wowza Media Server 3 on a CentOS 6.

First, update update CentOS to latest version and You will need Java installed. Type the following command:

# yum update -y
# yum install java* -y

Installing Wowza Media Server 3

You need to download the Wowza Media Server 3 from http://www.wowza.com/pricing/installer. Type the following command

# wget http://www.wowza.com/downloads/WowzaMediaServer-3-1-2/WowzaMediaServer-3.1.2.rpm.bin

Next, type the following command to install Wowza Media Server 3

# chmod +x WowzaMediaServer-3.1.2.rpm.bin
# ./WowzaMediaServer-3.1.2.rpm.bin

Setting up the License

In order to use Wowza Media Server, you’ll need a license, which can be obtained from the Wowza website (select a trail or developer license).
After, moving to the Wowza install directory and run the start up script

# cd /usr/local/WowzaMediaServer
# bin/startup.sh

If you wish to add WowzaMediaServer service to start when the machine boot, type the following command

# chkconfig --level 345 WowzaMediaServer on

Installing Wowza Examples

Type the following command

# cd /usr/local/WowzaMediaServerPro/examples
# ./install.sh
# /etc/init.d/WowzaMediaServer restart

If You are using a firewall, You need open the port: 1935. Type the following command if You are using iptables

# iptables -I INPUT -p tcp --dport 1935 -j ACCEPT

Default, media files to hosted at: /usr/local/WowzaMediaServer/content. You can copy movie file to here.
After, moving to /usr/local/WowzaMediaServer/examples/SimpleVideoStreaming and copy a folder called “client” to desktop.
Run “simplevideostreaming.html” in folder client. It look like

The post How To Install Wowza Media Server 3 On CentOS 6 appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

Q. How do I display summary statistics for each protocol on Linux ?
A. Using netstat command to display summary statistics for each protocol.

netstat command

netstat (network statistics) is a command-line tool that displays network connections (both incoming and outgoing), routing tables, and a number of network interface statistics. It is available on Unix, Unix-like, and Windows NT-based operating systems.

Display summary statistics using netstat

Simply use netstat -s

# netstat -s

Ouput

Ip:
    927340778 total packets received
    7 with invalid headers
    1959 with invalid addresses
    0 forwarded
    0 incoming packets discarded
    922379597 incoming packets delivered
    1280879573 requests sent out
    27 outgoing packets dropped
    4 fragments dropped after timeout
    757 reassemblies required
    354 packets reassembled ok
    4 packet reassembles failed
    20 fragments failed
Icmp:
    36541 ICMP messages received
    124 input ICMP message failed.
    ICMP input histogram:
        destination unreachable: 26890
        timeout in transit: 348
        source quenches: 11
        echo requests: 9274
        echo replies: 1
    18720 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
        destination unreachable: 9446
        echo replies: 9274
IcmpMsg:
        InType0: 1
        InType3: 26890
        InType4: 11
        InType8: 9274
        InType11: 348
        OutType0: 9274
        OutType3: 9446
Tcp:
    5916623 active connections openings
    36244722 passive connection openings
    102606 failed connection attempts
    3493764 connection resets received
    53 connections established
    918246879 segments received
    1254505238 segments send out
    22244556 segments retransmited
    0 bad segments received.
    5748855 resets sent
Udp:
    4086750 packets received
    9427 packets to unknown port received.
    0 packet receive errors
    4125646 packets sent
...

To display the statistics for only the TCP or UDP protocols, type one of the following commands

# netstat -st
# netstat -su

Ouput

IcmpMsg:
    InType0: 1
    InType3: 26890
    InType4: 11
    InType8: 9274
    InType11: 348
    OutType0: 9274
    OutType3: 9446
Tcp:
    5917335 active connections openings
    36247817 passive connection openings
    102606 failed connection attempts
    3493814 connection resets received
    29 connections established
    918349626 segments received
    1254667978 segments send out
    22246760 segments retransmited
    0 bad segments received.
    5749332 resets sent
...

To display the quick interfaces statistics, type the following command

# netstat -i

Ouput

Kernel Interface table
Iface       MTU Met    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0       1500   0 767575580      0      0      0 1120000223      0      0      0 BMRU
lo        16436   0 161102011      0      0      0 161102011      0      0      0 LRU

To display the extended interfaces statistics, type the following command

# netstat -ie

Ouput

Kernel Interface table
eth0      Link encap:Ethernet  HWaddr 00:25:90:0B:A3:E4
          inet addr:221.132.34.8  Bcast:221.132.34.95  Mask:255.255.255.224
          inet6 addr: fe80::225:90ff:fe0b:a3e4/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:767588970 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1120021944 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4030025515 (3.7 GiB)  TX bytes:2208549264 (2.0 GiB)
          Interrupt:169 Memory:fb5e0000-fb600000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:161106440 errors:0 dropped:0 overruns:0 frame:0
          TX packets:161106440 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3387569934 (3.1 GiB)  TX bytes:3387569934 (3.1 GiB)

The post How Do I Display Summary Statistics For Each Protocol On Linux ? appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

Sometimes you may want to disable ping response for many reasons, may be for a security reason… This article explains how do I disable the ping response on Linux ?

Disable ping response Temporarily

To disable the PING response, login as root and type the following command

# echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all

To reenable the PING response do this:

# echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all

Disable ping response Permanently

Edit the /etc/sysctl.conf file and add the following line

net.ipv4.conf.icmp_echo_ignore_all = 1

Execute sysctl -p to enforce this setting immediately

# sysctl -p

The post How Do I Disable The Ping Response On Linux? appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

Q. How do I find out my NIC speed in Linux ?
A. Use ethtool or mii-tool to display or change ethernet card settings.

ethtool

To display duplex speed of eth0, type the following command

# ethtool eth0

Sample outputs

Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000001 (1)
        Link detected: yes

mii-tool

To display duplex speed of eth0, type the following command

# mii-tool -v eth0

Sample outputs

SIOCGMIIREG on eth0 failed: Input/output error
eth0: negotiated 100baseTx-FD, link ok
  product info: vendor 00:50:43, model 11 rev 1
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
  link partner: 100baseT4 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

Where,
100baseTx-FD: 100Mbps full duplex (FD)
100baseTx-HD: 100Mbps half duplex (HD)
10baseT-FD: 10Mbps full duplex (FD)
10baseT-HD: 10Mbps half duplex (HD)

The post How To Find Out My NIC Speed ? appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

Configure a static IP address on CentOS is quite easy. In this article, I’ll show you how to do it through command line.

Log on as root, change directory to /etc/sysconfig/network-scripts and list all available devices with the following command

# cd /etc/sysconfig/network-scripts
# ls -la | grep ifcfg-

Sample outputs

-rw-r--r--  3 root root   244 Oct 15  2010 ifcfg-eth0
-rw-r--r--  3 root root   141 Oct 15  2010 ifcfg-eth1
-rw-r--r--  1 root root   254 Oct 13  2010 ifcfg-lo

Find the configuration file corresponding to the NIC for which you want to set a static IP and edit it. In this example I’ll configure a static IP address for eth1 and use the following Internet Protocol Version 4:
# IP address: 192.168.1.10
# Netmask: 255.255.255.0
# Gateway IP: 192.168.1.1
# DNS Server IP # 2: 8.8.8.8
# DNS Server IP # 2: 8.8.4.4

# vi ifcfg-eth1

Sample outputs

# Intel Corporation 82574L Gigabit Network Connection
DEVICE=eth1
HWADDR=00:25:90:0B:A3:E5
ONBOOT=no
HOTPLUG=no
BOOTPROTO=dhcp
TYPE=Ethernet

Now set the parameters below according to your settings, sample static ip configuration

# Intel Corporation 82574L Gigabit Network Connection
DEVICE=eth1
BOOTPROTO=static
DHCPCLASS=
HWADDR=00:25:90:0B:A3:E5
IPADDR=192.168.1.10
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
ONBOOT=yes

To setup DNS servers, edit /etc/resolv.conf, enter

# vi /etc/resolv.conf

Sample configurations

nameserver 8.8.8.8
nameserver 8.8.4.4

Now save the configuration file and exit the text editor. To apply changes, we need to bring the network interface down and back up, type the following command

# /etc/init.d/network restart

Or,

# service network restart

The post How To Configure Static IP Address On CentOS appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

How to start/stop/restart networking service under Linux operating systems after making changes to IP configuration from a shell prompt ?

Use the following commands as per your Linux distribution to start/stop/restart the networking service.

RedHat / CentOS / Fedora

To start networking service, enter

# /etc/init.d/network start

Or,

# service network start

To stop networking service, enter

# /etc/init.d/network stop

Or,

# service network stop

To restart networking service, enter

# /etc/init.d/network restart

Or,

# service network restart

Ubuntu / Debian

To start networking service, enter

# sudo /etc/init.d/networking start

Or,

# sudo service networking start

To stop networking service, enter

# sudo /etc/init.d/networking stop

Or,

# sudo service networking stop

To restart networking service, enter

# sudo /etc/init.d/networking restart

Or,

# service networking restart

The post How To Restart Networking Service In Linux appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

Save Iptables rules

Rules created with the iptables command are stored in memory. If the system is restarted before saving the iptables rule set, all rules are lost. To save netfilter rules, type the following command as root:

# /etc/init.d/iptables save 

If you are using IPv6, enter:

# /etc/init.d/ip6tables save 

The above commands will write the current iptables configuration to /etc/sysconfig/iptables. The next time the system boots, the iptables init script reapplies the rules saved in /etc/sysconfig/iptables. You can also save the iptables rules to a separate file for distribution, backup or other purposes. Type the following command as root

# iptables-save > /root/iptables.rules

If you are using IPv6, enter:

# ip6tables-save  > /root/iptables.rules

Restore Iptables rules

To restore it use the command iptables-restore, type the following command as root:

# iptables-restore < /root/iptables.rules

If you are using IPv6, enter:

# ip6tables-restore < /root/iptables.rules

The post How To Save/Restore Iptables Rules appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

Iptables should be installed by default on all CentOS 3.x, 4.x and 5.x installations. You can check to see if iptables is installed on your system by:

# rpm -q iptables

Sample output

iptables-1.3.5-5.3.el5_4.1

How to enable firewall

Login as root and type the following command

# /etc/init.d/iptables start
# chkconfig iptables on

If you are using IPv6, enter:

# /etc/init.d/ip6tables start
# chkconfig ip6tables on

And to see if iptables is actually running, we can check that the iptables modules are loaded, type the following command

# lsmod | grep ip_tables

Something look like:

ip_tables              29288  1 iptable_filter
x_tables               29192  6 ip6t_REJECT,ip6_tables,ipt_REJECT,xt_state,xt_tcpudp,ip_tables

How to disable firewall

Login as root and type the following command

# /etc/init.d/iptables stop
# chkconfig iptables off

If you are using IPv6, enter:

# /etc/init.d/ip6tables stop
# chkconfig ip6tables off

The post How To Enable/Disable Firewall On Centos / RedHat / Fedora appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.