리눅스 기초 다지기 - 25. route

 

라우팅

: 네트워크를 통해 목적지로 패킷이 전송될 경로를 지정해주는 것

 

route -n

: 라우트 설정 확인

[root@control ~]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         _gateway        0.0.0.0         UG    300    0        0 bond0
172.17.0.0      0.0.0.0         255.255.255.0   U     300    0        0 bond0

[root@control ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.0.1      0.0.0.0         UG    300    0        0 bond0
172.17.0.0      0.0.0.0         255.255.255.0   U     300    0        0 bond0

 

라우팅 테이블 필드

 

 

디폴트 게이트웨이 추가

[root@control ~]# route add default gw 172.17.0.2

[root@control ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.0.2      0.0.0.0         UG    0      0        0 bond0
0.0.0.0         172.17.0.1      0.0.0.0         UG    300    0        0 bond0
172.17.0.0      0.0.0.0         255.255.255.0   U     300    0        0 bond0

 

디폴트 게이트웨이 제거

[root@control ~]# route del default gw 172.17.0.2

[root@control ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.0.1      0.0.0.0         UG    300    0        0 bond0
172.17.0.0      0.0.0.0         255.255.255.0   U     300    0        0 bond0

 

임시적으로 라우팅 설정하기

 

네트워크 경로 추가

[root@control ~]# route add -net 172.17.1.0 netmask 255.255.255.0 gw 172.17.0.1

[root@control ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.0.1      0.0.0.0         UG    300    0        0 bond0
172.17.0.0      0.0.0.0         255.255.255.0   U     300    0        0 bond0
172.17.1.0      172.17.0.1      255.255.255.0   UG    0      0        0 bond0

 

네트워크 경로 제거

[root@control ~]# route del -net 172.17.1.0 netmask 255.255.255.0 gw 172.17.0.1

[root@control ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.0.1      0.0.0.0         UG    300    0        0 bond0
172.17.0.0      0.0.0.0         255.255.255.0   U     300    0        0 bond0

 

호스트 경로 추가

[root@control ~]# route add -host 172.17.1.100 gw 172.17.0.1

[root@control ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.0.1      0.0.0.0         UG    300    0        0 bond0
172.17.0.0      0.0.0.0         255.255.255.0   U     300    0        0 bond0
172.17.1.100    172.17.0.1      255.255.255.255 UGH   0      0        0 bond0

 

호스트 경로 제거

[root@control ~]# route del -host 172.17.1.100 gw 172.17.0.1

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.0.1      0.0.0.0         UG    300    0        0 bond0
172.17.0.0      0.0.0.0         255.255.255.0   U     300    0        0 bond0

 

영구적으로 라우팅 테이블 설정

라우팅 추가

[root@control ~]# nmcli con mod enp0s8 +ipv4.routes "192.168.0.0/24 10.0.0.110"

 

라우팅 제거

[root@control ~]# nmcli con mod enp0s8 -ipv4.routes "192.168.0.0/24 10.0.0.110"

 

라우팅 우선 순위 변경

# connection-name 확인
[root@control ~]# nmcli con
NAME    UUID                                  TYPE      DEVICE
enp0s3  0513de10-4d94-3005-91bb-92d4231268cc  ethernet  enp0s3
lo      142becde-ac8a-4091-8816-c1c7b0b240aa  loopback  lo

# metric 변경
[root@control ~]# nmcli con mod enp0s3 ipv4.route-metric 101

# metric 변경 확인
[root@control ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.0.1      0.0.0.0         UG    101    0        0 enp0s3
172.17.0.0      0.0.0.0         255.255.255.0   U     101    0        0 enp0s3