1. EXNO:12 NETWORKING AND INTERFACE
PROCEDURE:
1. To get the current user who logged in and to switch user
[admin@FossServer ~]$ whoami
admin
[admin@FossServer ~]$ su
Password:
[root@FossServer admin]# whoami
root
2. To set the IP addresss
[root@FossServer network-scripts]# ifconfig
eth0 Link encap:Ethernet HWaddr E0:69:95:00:89:20
inet addr:172.16.121.45 Bcast:172.16.255.255
Mask:255.255.0.0
inet6 addr: fe80::e269:95ff:fe00:8920/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500

2. Metric:1
RX packets:11581 errors:0 dropped:0 overruns:0 frame:0
TX packets:39 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1030758 (1006.5 KiB) TX bytes:7458 (7.2 KiB)
Interrupt:20 Memory:fe400000-fe420000
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:64 errors:0 dropped:0 overruns:0 frame:0
TX packets:64 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4752 (4.6 KiB) TX bytes:4752 (4.6 KiB)

3. [root@FossServer network-scripts]# service NetworkManager status
NetworkManager (pid 2648) is running...
[root@FossServer network-scripts]# service NetworkManager stop
Stopping NetworkManager daemon: [ OK ]
[root@FossServer network-scripts]# ifconfig
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:64 errors:0 dropped:0 overruns:0 frame:0
TX packets:64 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4752 (4.6 KiB) TX bytes:4752 (4.6 KiB)
[root@FossServer network-scripts]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr E0:69:95:00:89:20

4. inet addr:172.16.121.45 Bcast:172.16.255.255
Mask:255.255.0.0
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:11765 errors:0 dropped:0 overruns:0 frame:0
TX packets:39 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1048164 (1023.5 KiB) TX bytes:7458 (7.2 KiB)
Interrupt:20 Memory:fe400000-fe420000
[root@FossServer network-scripts]# service network status
Configured devices:
lo eth0
Currently active devices:
lo
[root@FossServer network-scripts]# service network stop
Shutting down loopback interface: [ OK ]

5. [root@FossServer network-scripts]# ifconfig
[root@FossServer network-scripts]# ifdown eth0
[root@FossServer network-scripts]# ifdown lo
[root@FossServer network-scripts]# ifconfig eth0 172.16.121.45
netmask 255.255.0.0 up
[root@FossServer network-scripts]# ifconfig
eth0 Link encap:Ethernet HWaddr E0:69:95:00:89:20
inet addr:172.16.121.45 Bcast:172.16.255.255
Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500
Metric:1
RX packets:11992 errors:0 dropped:0 overruns:0 frame:0
TX packets:43 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1068024 (1.0 MiB) TX bytes:8564 (8.3 KiB)
Interrupt:20 Memory:fe400000-fe420000

6. [root@FossServer network-scripts]# ifconfig lo
lo Link encap:Local Loopback
LOOPBACK MTU:16436 Metric:1
RX packets:64 errors:0 dropped:0 overruns:0 frame:0
TX packets:64 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4752 (4.6 KiB) TX bytes:4752 (4.6 KiB)
[root@FossServer network-scripts]# ifup lo
[root@FossServer network-scripts]# ifconfig
eth0 Link encap:Ethernet HWaddr E0:69:95:00:89:20
inet addr:172.16.121.45 Bcast:172.16.255.255
Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500
Metric:1
RX packets:12352 errors:0 dropped:0 overruns:0 frame:0
TX packets:43 errors:0 dropped:0 overruns:0 carrier:0

7. collisions:0 txqueuelen:1000
RX bytes:1100369 (1.0 MiB) TX bytes:8564 (8.3 KiB)
Interrupt:20 Memory:fe400000-fe420000
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:64 errors:0 dropped:0 overruns:0 frame:0
TX packets:64 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4752 (4.6 KiB) TX bytes:4752 (4.6 KiB)
[root@FossServer network-scripts]#
3. To set the GATEWAY ip address

8. [root@FossServer network-scripts]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
172.16.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
[root@FossServer network-scripts]# route add default gw
172.16.121.1
[root@FossServer network-scripts]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
172.16.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 172.16.121.1 0.0.0.0 UG 0 0 0 eth0
4. To set the DNS ip
[admin@FossServer etc]$ su
Password:
[root@FossServer ~]$ pwd

9. /home/admin
[admin@FossServer ~]$ cd /etc
[root@FossServer etc]# pwd
/etc
[root@FossServer etc]# ls
abrt init rc
acpi init.d rc0.d
adjtime inittab rc1.d
aliases inputrc rc2.d
aliases.db iproute2 rc3.d
alsa ipsec.conf rc4.d
alternatives ipsec.d rc5.d
anacrontab ipsec.secrets rc6.d
ant.conf issue rc.d
ant.d issue.net rc.local
anthy-conf java rc.sysinit

10. asound.conf jvm readahead.conf
at.deny jvm-commmon reader.conf.d
audisp jwhois.conf redhat-release
audit kde report.conf
avahi krb5.conf report.d
BackupPC ld.so.cache request-key.conf
bash_completion.d ld.so.conf resolv.conf
bashrc ld.so.conf.d rmt
blkid lftp.conf rpc
bluetooth libaudit.conf rpm
bonobo-activation libuser.conf rsyslog.conf
cgconfig.conf localtime rwtab
cgrules.conf login.defs rwtab.d
chkconfig.d logrotate.conf samba
ConsoleKit logrotate.d sane.d
cron.d ltrace.conf sasl2

11. cron.daily lvm screenrc
cron.deny mail securetty
cron.hourly mailcap security
cron.monthly mail.rc selinux
crontab man_db.conf services
cron.weekly maven sestatus.conf
crypttab mdadm.conf setroubleshoot
csh.cshrc mime.types setuptool.d
csh.login mke2fs.conf sgml
cups modprobe.d shadow
dbus-1 motd shadow-
default mtab shells
depmod.d mtab.fuselock skel
dhcp mtools.conf slrn.rc
DIR_COLORS multipath smartd.conf
DIR_COLORS.256color Muttrc smolt

12. DIR_COLORS.lightbgcolor Muttrc.local smrsh
dnsmasq.conf my.cnf snmp
dnsmasq.d nanorc sos.conf
dracut.conf netconfig sound
dracut.conf.d NetworkManager squid
dumpdates networks ssh
elinks.conf nfsmount.conf ssl
environment nsswitch.conf sssd
ethers ntp statetab
exports ntp.conf statetab.d
favicon.png obex-data-server stunnel
fedora-release odbc.ini subversion
festival odbcinst.ini sudoers
filesystems openldap sudoers.d
fonts openvpn sysconfig
foomatic opt sysctl.conf

13. fprintd.conf PackageKit systemd
fstab pam.d system-release
gconf pam_pkcs11 system-release-cpe
gcrypt pango terminfo
gdm passwd udev
ghostscript passwd- updatedb.conf
gimp pbm2ppa.conf UPower
gnome-settings-daemon pcmcia urlview.conf
gnome-vfs-2.0 php.d usb_modeswitch.conf
gnupg php.ini usb_modeswitch.d
gpm-root.conf pinforc vimrc
gpm-syn.conf pki virc
gpm-twiddler.conf plymouth vpnc
gre.d pm vsftpd
GREP_COLORS pm-utils-hd-apm-restore.conf
warnquota.conf
group pnm2ppa.conf webalizer.conf

14. group- polkit-1 wgetrc
grub.conf popt.d wpa_supplicant
gshadow portreserve X11
gshadow- ppp xdg
gssapi_mech.conf prelink.cache xinetd.d
gtk-2.0 prelink.conf xml
gtk-3.0 prelink.conf.d yp.conf
hal printcap yum
host.conf profile yum.conf
hosts profile.d yum.repos.d
hosts.allow protocols zlogin
hosts.deny pulse zlogout
hp purple zprofile
httpd quotagrpadmins zshenv
idmapd.conf quotatab zshrc
[root@FossServer etc]#

15. 5. edit resolv.conf file to set the DNS ip addr
[root@FossServer etc]# vi resolv.conf
6. Add the text below in the file at bottom
nameserver 172.16.121.2
7. To set the IP address permanently follow the steps below
[root@FossServer etc]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE="eth0"
HWADDR="E0:69:95:00:89:20"
NM_CONTROLLED="yes"
ONBOOT="no"
BOOTPROTO=none
IPV6INIT="no"
~
8. update the above file as below
DEVICE="eth0"

16. HWADDR="E0:69:95:00:89:20"
NM_CONTROLLED="yes"
ONBOOT="yes"
BOOTPROTO=static
IPV6INIT="no"
IPADDR=172.16.121.45
NETMASK=255.255.0.0
GATEWAY=172.16.121.1
DNS=172.16.121.2
9. save the file and quit the editor.
10. Next start the network and networkmanager
services
[root@FossServer etc]# service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]

17. Bringing up interface eth0: [ OK ]
[root@FossServer etc]# service NetworkManager restart
Stopping NetworkManager daemon: [FAILED]
Setting network parameters... [ OK ]
Starting NetworkManager daemon: [ OK ]