====== Network Configuration ======

===== General =====

<code>
ping -c4
ss -tul All UDP and TCP port listening
systemctl status NetworkManager
hostnamectl status
hostname set-hostname <newname>
/etc/hostname
/etc/hosts
</code>

===== iproute =====

List network cards
<code>
ip link list
</code>

List statistics network cards
<code>
ip -s link
</code>

Display device attributes
<code>
ip address show
</code>

Just up device.
<code>
ip address show up
</code>

Live IP configuration (non persistent)
<code>
ip addr add 192.168.50.5/24 dev eth1
ip addr del 192.168.50.5/24 dev eth1
</code>

Route list.
<code>
ip route list
ip route show
</code>

Obtain route use for 1.2.3.4
<code>
ip route get to 1.2.3.4
</code>

Print cache.
<code>
ip route ls cache
</code>

Flush route cache.
<code>
ip route flush cache
</code>

List rules.
<code>
ip rule show
</code>

Drop routing form 192.168.44.0/24 on the principal table
<code>
ip rule add table main type prohibit from 192.168.44.0/24
</code>

In ip rule add, type posibilities.
  * blackhole - the rule prescribes to silently drop the packet.
  * unreachable - the rule prescribes to generate a ’Network is unreachable’ error.
  * prohibit - the rule prescribes to generate ’Communication is administratively prohibited’ error.

File witch contains name table list.
<code>
/etc/iproute2/rt_tables
</code>

Create a new table.
<code>
echo 200 table33 >> /etc/iproute2/rt_tables
</code>

Add default route on this table.
<code>
ip route add default via 192.168.33.1 dev eth0 table table33
</code>

Verify.
<code>
ip route show table table33
</code>

Add new rule for the packets from 192.168.33.0/24 routed on the new table created (table33) 
<code>
ip rule add from 192.168.33.0/24 table table33
</code>

===== nmcli =====

<code>
systemctl status NetworkManager
nmcli
nmtui
nmcli con shown
mcli con show <devicename>
nmcli dev status
ncli dev show <devicename>
nmcli con down eth0 && nmcli con up eth0
man nmcli-examples
nmcli con reload
</code>