S1: Network

[paolodemichele]

Important Notes:

• for each command mind to sign all (S)CRUD operations. Thanks. (https://en.wikipedia.org/wiki/Create,_read,_update_and_delete)
• maintain uptime, flushes and restart/reloads, at 95% take it down.
  an important difference of iproute2 is:
• virtual interfaces eth0:X are not necessary.
• you can add/remove many ip set from interfaces.

IPROUTE2:

• Add new address (ipv4):

ip addr add xx.xx.xx.xx/xx broadcast xx.xx.xx.xx dev ethx

• Add new address (ipv6):

ip -6 addr add ipv6/64 dev ethx (should be possible change the netmask for obvious reasons)

• Add ipv6 gateway:

ip -6 route add default via ipv6_gateway dev ethx

• Delete (prefer instead of flush!)

ip addr del xx.xx.xx.xx/xx broadcast xx.xx.xx.xx dev ethx

• Flush configuration:

ip addr flush dev ethx
ip -stat -stat addr flush to 10/8 

(delete range 10.0.0.0/8 and so on)

ip -4 addr flush label "eth*" 

(flush all ethx addresses)

ip -6 addr flush dynamic

• Show interfaces:

ip addr show ethx

• Show network card statistics:

ip -s link ls ethx

• Create/Add route:

ip route add default via xx.xx.xx.xx
ip route add xx.xx.xx.xx/24 via xx.xx.xx.xx *(possible many netmasks)*

• Create/Add default multipath route splitting load between ppp0 and ppp1 (or other networks)

ip route add default scope global nexthop dev ppp0 nexthop dev ppp1

• Natting:

ip route add nat xx.xx.xx.xx via xx.xx.xx.xx

• Delete:

ip route del default via xx.xx.xx.xx
ip route del xx.xx.xx.xx via xx.xx.xx.xx

• Show routes:

ip route show

• Enable/disable, Take Up/Down interfaces:

ip link set ethx up | down

BRCTL:

• Create/Add brdige name:

brctl addbr name

• Delete bridge name:

brctl delbr name

• Create/Add network interfaces to brctl interface:

brctl addif name ethx 

(for instance, eth0 - eth1 and so on)

• Delete network interfaces to brctl interface:

brctl delif name ethx

• Enable/Disable stp on bridge:

brctl stp name on | off

• Show MACs and stp:

brctl showmacs name
brctl showstp name

• Another important option could be the priority port and the cost path:

brctl setpathcost name <port> <cost> set path cost
brctl setportprio name <port> <prio> set port priority

TEAMCTL:

• sample configuration with active/backup mode using teamnl and ip:

ip link add team0 type bond (many other)
teamnl team0 setoption mode activebackup
ip link set dev eth0 master team0
ip link set dev eth1 master team0
ip addr add xxx.xxx.xxx.xxx/XX broadcast yyy.yyy.yyy.yyy dev team0
ip link set team0 up

-View teamnl mode:

teamnl name getoption mode

-View ports associated:

teamnl team0 ports

IFENSLAVE:

PSEUDO FS proc AND sys operations. :

CONVERSIONS:

• Conversion from standard interface to a Bridge one at runtime without loosing connections
  in a not interactive shell, aka Screen or HOHUP execute this procedure:

brctl addbr br0
brctl addif br0 eth0
ip link set eth0 up
ip link set br0 up
ip addr add xxx.xxx.xxx.xxx/XX dev br0
ip addr del xxx.xxx.xxx.xxx/XX dev eth0
ip route del default via yyy.yyy.yyy.yyy dev eth0
ip route add default via yyy.yyy.yyy.yyy dev br0

• Conversion from standard interface to a Bond one at runtime without loosing connections
• Conversion from standard interface to a Team one at runtime without loosing connections