[Routing][Concept] Routing command

When type ip rule will show like following ``` # ip rule show 0: from all lookup local 32766: from all lookup main 32767: from all lookup default ``` I draw picture like following ``` +-------------------------------------+ | ip rule | | +------------+ | | | | | | | local | | | | | | | +------------+ | | | | +------------+ | | | | | | | main | | | | | | | +------------+ | +-------------------------------------+ ``` ip route show table main = ip route show = route -n ``` [happy@localhost tftp]$ ip route show table main default via 192.168.0.1 dev wlp3s0 default via 192.168.1.1 dev enp4s0 default via 192.168.0.1 dev wlp3s0 src 192.168.0.101 metric 302 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 192.168.0.0/24 dev wlp3s0 proto kernel scope link src 192.168.0.101 metric 302 192.168.1.0/24 dev enp4s0 proto kernel scope link src 192.168.1.2 192.168.100.0/24 dev enp0s20u13 proto kernel scope link src 192.168.100.20 linkdown [happy@localhost tftp]$ ip route show default via 192.168.0.1 dev wlp3s0 default via 192.168.1.1 dev enp4s0 default via 192.168.0.1 dev wlp3s0 src 192.168.0.101 metric 302 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 192.168.0.0/24 dev wlp3s0 proto kernel scope link src 192.168.0.101 metric 302 192.168.1.0/24 dev enp4s0 proto kernel scope link src 192.168.1.2 192.168.100.0/24 dev enp0s20u13 proto kernel scope link src 192.168.100.20 linkdown [happy@localhost tftp]$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 wlp3s0 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 enp4s0 0.0.0.0 192.168.0.1 0.0.0.0 UG 302 0 0 wlp3s0 172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0 192.168.0.0 0.0.0.0 255.255.255.0 U 302 0 0 wlp3s0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 enp4s0 192.168.100.0 0.0.0.0 255.255.255.0 U 0 0 0 enp0s20u13 ```