Linux
LINUX
NETWORKING Basics
·
Protocols are visible in the protocol
field of the ip header, and are listed in the /etc/protocols file :: vi
/etc/protocls
·
There is a list of port numbers are
defined in /etc/services.
·
Change hostname : vi /etc/sysconfig/network
·
Each network card can be configured
individually using the /etc/sysconfig/network-scripts/ifcfg-*
files
·
ifdown eth0 && ifup eth0 (enable disable interface)
·
ifconfig : to show list of active interface
card. "lo" interface
is a loopback interface.
·
Can get the individual detail of the
interface : ifconfig eth0
·
ifconfig eth0 up will re-activate the
nic keeping its existing (current) configuration, whereas ifup will read the correct file that
contains a (possibly new) configuration and use this config file to bring the interface up.
·
The ifconfig tool is deprecated on
some systems. Use the ip tool instead. $ ip
activate
·
grep HOSTNAME
/etc/sysconfig/network -- hostname --- cat
/etc/hostname
·
The ip to mac resolution is handled
by the layer two broadcast protocol arp. The arp table can be displayed with
the arp tool.
·
The ip to mac resolution is handled
by the layer two broadcast protocol arp. The arp table can be displayed with
the arp tool.
use
arp -a to display the arp table.
use
arp -d to remove an entry from the
arp table.
·
The computer's local routing table
with the command (and also with netstat
-r)
/sbin/route or netstat
-re-activate
·
If you can ping to another host, then
tcp/ip is configured. ]# ping
192.168.1.5
·
To display or change network card
settings, use ethtool ]# ethtool
eth1
·
Sometimes a server needs more than
one ip address on the same network card, we call this "binding" ip addresses.
·
Linux can also activate multiple
network cards behind the same ip address, this is called "bonding".
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Good information!
ReplyDeleteVery useful information
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