2-2 일차 STATIC을 이용한 라우팅.

# 라우터 설정 두 가지 방법.
1) ip route [목적지 주소] [목적지 subnetmask] [next hop Router IP]
2) ip route [목적지 주소] [목적지 subnetmask] [exit Router interface]

222.net

r1(config) ip route 1.1.34.0 255.255.255.252 s1/0  --내꺼
r1(config) ip route 1.1.34.0 255.255.255.252 1.1.12.2 --나가는 쪽

TTL--네트워크 지날때마다 1씩 깎임... 윈도우 28, 유닉스64, DOS 255

## 3가지 네트워크 도달 불가 이유
못가거나(....),
가다가 죽거나(Untouchable),
가다가 못돌아오거나

#####################
R1# ping 1.1.34.2
(D:1.1.34.2 / S:1.1.12.1)
R1:ip route 1.1.34.0 255.255.255.252 1.1.12.2
R2:ip route 1.1.34.0 255.255.255.252 1.1.23.2
(D: 1.1.12.1 / S:1.1.34.2)
R4:ip route 1.1.12.0 255.255.255.252 1.1.34.1
R3:ip route 1.1.12.0 255.255.255.252 1.1.23.1

1. R1# ping 1.1.32.2 source 1.1.1.1
2. R1# ping 1.1.4.4 source 1.1.1.1
3. R1#ping 1.1.4.4

 

출발지 주소를 내꺼로 바꾸는 것 source

lo 0 1.1.1.1/24 s1/0 1.1.12.0/30  R2  s1/1 1.1.23.0/30 R3 s1/0 1.1.34.0/30 R4 lo 01.1.4.4/24

1. R1# ping 1.1.32.2 source 1.1.1.1
(D:1.1.34.2 / S:1.1.12.1)
R1:ip route 1.1.34.0 255.255.255.252 1.1.12.2
R2:ip route 1.1.34.0 255.255.255.252 1.1.23.2
(D: 1.1.12.1 / S:1.1.34.2)
R4:ip route 1.1.12.0 255.255.255.252 1.1.34.1
R3:ip route 1.1.12.0 255.255.255.252 1.1.23.1
R2:ip route 1.1.12.0 255.255.255.252 1.1.12.1

2. R1# ping 1.1.4.4 source 1.1.1.1
(D:1.1.4.4 / S:1.1.1.1)
R1:ip route 1.1.4.0 255.255.255.0 1.1.12.2
R2:ip route 1.1.4.0 255.255.255.0 1.1.23.2
R3:ip route 1.1.4.0 255.255.255.0 1.1.34.2
(D: 1.1.12.1 / S:1.1.34.2)
R4:ip route 1.1.1.0 255.255.255.0 1.1.34.1
R3:ip route 1.1.1.0 255.255.255.0 1.1.23.1
R2:ip route 1.1.1.0 255.255.255.0 1.1.12.1

3. R1#ping 1.1.4.4
(D:1.1.4.4 / S:1.1.1.1)
R1:ip route 1.1.4.0 255.255.255.0 1.1.12.2
R2:ip route 1.1.4.0 255.255.255.0 1.1.23.2
R3:ip route 1.1.4.0 255.255.255.0 1.1.34.2
(D: 1.1.12.1 / S:1.1.34.2)
R4:ip route 1.1.12.0 255.255.255.0 1.1.34.1
R3:ip route 1.1.12.0 255.255.255.0 1.1.23.1

 \\\\\\\\\\\\\\\\\\\\\\\\\\\\

풀이.
마지막에 R4를 안적는 이유는 R3까지만 가면 R4와는 링크로 물리적 연결이 되어 있기에 테이블 정보가 C(conneted)로 나타나있다. 그래서 S(statitc)을 설정안해줘도 알아서 들어온다.