How to configure Network Bonding on RHEL 7

Step by Step method to configure the network bonding on RHEL 7:

 

➤ Please log on to linux server and run the "ip a" command to check the available interfaces.

    [root@localhost]# ip a
    lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever

    eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:50:56:bd:c7:f9 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.2 brd 192.168.1.255 scope global eth0
       valid_lft forever preferred_lft forever

➤ Load the bonding driver called “bonding” in the kernel with the modprobe command if it is not already loaded, and verify with the modinfo command:

[root@localhost]# modprobe bonding
[root@localhost]# modinfo bonding
 

➤ In this step you need to generate UUIDs for interfaces using the below command.

[root@localhost]# uuidgen <interface-name>
 

➤ Now create a file called ifcfg-bond0 in the /etc/sysconfig/network-scripts directory for bond0 with the following settings. Please use vi editor to edit this file.

[root@localhost]# cd /etc/sysconfig/network-scripts
[root@localhost]# vi ifcfg-bond0

DEVICE=bond0
Name=bond0
TYPE=bond0
BONDING_MASTER=yes
BONDING_OPTS="mode=balance-rr"
ONBOOT=yes
IPADDR=192.168.1.23
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
 

➤ Now create ifcfg-eth2 and ifcfg-eth3 files in the /etc/sysconfig/network-scripts directory for eth2 and eth3 interfaces with the following settings. Set the MASTER directive to bond0. Both interfaces will act as slaves with no IP addresses assigned to them.

[root@localhost]# vi ifcfg-eth1

DEVICE=eth1
TYPE=Ethernet
NAME=eth1
UUID=23a32d65-343d-48a2-8rf7-d2jh2388f666
ONBOOT=yes
MASTER=bond0
SLAVE=yes

[root@localhost]# vi ifcfg-eth2

DEVICE=eth2
TYPE=Ethernet
NAME=eth2
UUID=22a32d65-443d-48d2-8rf7-d2jh222f666
ONBOOT=yes
MASTER=bond0
SLAVE=yes
 

➤ Now deactivate and reactivate bond0 with the ifdown and ifup commands:

[root@localhost]# ifdown bond0; ifup bond0
 

➤ Check the status of bond0 and the slaves with the ip command. It should also show the assigned IP.

[root@localhost]# ip addr
 

➤ Restart the system to ensure the configuration survives system reboots
[root@localhost]# reboot

How to Create VNIC and Assign a IP Address on Solaris 11

For creating Virtual NIC and assigning fix static IP address in Solaris 11 we need to understand the basic difference between older version of Solaris and Solaris 11.

In Solaris 10, according to the NIC manufacturer,physical network interfaces are named as (Ex:bge,e1000g,nxge).But in Solaris 11 onwards,the names are hidden from the view and all the interfaces will be named as net0,net1…netx.

Before forward to main work we need to know that using which command we can check which interface has been mapped to physical interface. Using below command you can check all the network interface details.

sun01# dladm show-phys

LINK              MEDIA                STATE      SPEED  DUPLEX    DEVICE

net0              Ethernet             up         1000   full      bge001

net1              Ethernet             up         1000   full      bge002

If you want to show all dladm level devices,including VNIC’s & aggregation links,use the below command-

sun01# dladm show-link

LINK                CLASS     MTU    STATE    OVER

net0                phys      1500   up       --

net1                phys      1500   up       --

In Solaris 11,you can give a meaning full description(net1/oracle_VIP) to all the IP address on the system unlike Solaris 10. (e1000g1:2)

How to assigning new IP address to NIC:-

1. We can see how we assigned IP address to the physical interface, so in the first step we will check all the physical interface using below command.

sun01# dladm show-phys

LINK              MEDIA                STATE      SPEED  DUPLEX    DEVICE

net0              Ethernet             up         1000   full      bge001

net1              Ethernet             up         1000   full      bge002

2. In this step we would know how we will create a new interface so you can use the below command for this.

sun01# ipadm create-ip net1

3. This is the main step to assign the static ip address to the newly created interface net1. You can use below command or syntax to assign the fixed IP.

sun01#ipadm create-addr -T static -a local=10.135.0.2/24 net1

You can change your IP address accordingly. 

4. Now we will Verify whether IP address is configured or not which we assigned on above step.

sun01# ifconfig  net1

net1: flags=1000843 mtu 1500 index 7

        inet 10.135.0.2 netmask ffffff00 broadcast 10.135.0.255

        ether 0a:cB:12:8e:15:e2

If you see the above output, the new IP address is shown on net1 interface successfully. Using above all 4 steps you can know how we will assinged the static ip address to the sun solaris 11 operating system.

Now we will go for Virtual Network Interface creation steps.I can create N number of VNIC’s using single physical interface.These VNIC are treated as actual physical interface and possible to assign to local zones with  full access to it.

How to create a new VNIC using interface net2:-

1. In the initial steps I will run the same command to check out the all physical interface which is available on the Solaris 11 Server.

sun01# dladm show-phys

LINK              MEDIA                STATE      SPEED  DUPLEX    DEVICE

net0              Ethernet             up         1000   full      bge001

net1              Ethernet             up         1000   full      bge002

net2              Ethernet             unknown    1000   full      bge003

If you see the above command output network interface "net2" is in unknow state, So in the next step I will create a new VNIC using net2.

2. In this step we will create a new VNIC using net2. In my case i will suppose VNIC name “vnic01”, so for creating the new VNIC we will run the below command which describe below.

sun01#dladm create-vnic  -l net2 vnic01

3.Now, We will plumb the virtual interface and create a default IP to new VNIC.

sun01# dladm create-vnic  -l net2 vnic01

sun01# ipadm create-ip vnic01

sun01# ifconfig vnic01

vnic01: flags=1000842 mtu 1500 index 8

        inet 0.0.0.0 netmask 0

        ether 2c:18:10:Ce:1a:12

4. Now we will assign the new IP address to VNIC and verfif that new IP for vnic01 is configured or not.

sun01# ipadm create-addr -T static -a local=10.135.0.3/24 vnic01

sun01# ifconfig vnic01

vnic01: flags=1000843 mtu 1500 index 8

        inet 10.135.0.3 netmask ffffff00 broadcast 10.135.0.255

        ether 2c:18:10:Ce:1a:12

5. In the final step we will try to run snoop on VNIC which we have create now. You can verify through snooping is that VNIC01 is working fine or not.

sun01# snoop -d vnic01

The same way you can create a multiple VNIC and assign a new IP address to it. Hope you got some idea about Solaris 11 networking part after reading this post. Please let me know if you have any doubt regarding this post.

How to find MP console IP address from the running HP-UX Operating system

This post is useful to identify the MP console IP address from the running HP-UX OS, if you forgotten the existing IP address.

For Itanium systems running 11.31 version only we can use smh and the cprop command. These both method works to recover the forgotten password.

cprop is what the smh webpage uses to retrieve the IP address. Run the smh webpage (hostname:hp_ux)

Home -> System -> Management Processor

It is show you the IP address of console port. Also please find the below "cprop" command usage, how to we run this command.

hp_ux:/>/opt/propplus/bin/cprop -summary -c “Management Processor”

[Component]: Management Processor

[Table]: Management Processor

——————————————————-

****************************************************

                   [Hash ID]: Management Processor:11a64d1ax41eed6da

                    [Status]: OK

                 [IPAddress]: 192.168.1.23

                       [URL]: https://192.168.1.23

                     [State]: Enabled

****************************************************

For PARISC boxes and Itanium models running 11.23 or earlier, you must use the serial port on the back of the box. The commands will be:

ctrl-a (to get the attention of the console interface)

<login> typically Admin and Admin

CM (to get to the command menu)

LC 

MA (to exit the CM menu)

X  (to exit the GSP or MP menu)

You can connect the MP console using serial cable, in every HP-UX server are consist this port. Connect the serial cable from one end of server MP port and other side connect to laptop. When you login on the MP console you will get the above option on the server.