VLSM 란 무엇인가?
VLSM [Variable Length subnetMask]에 대해서 알아보겠습니다.
- 하나의 네트워크를 효율적으로 사용하기 위해서 여러 단위의 네트워크로 분할하여 사용하는 기능을 의미합니다.
예제) 192.168.1.0/24 네트워크를 사용하여 모든 구간에 IP주소를 할당해 보겠습니다.
192.168.1.96/30 192.168.1.100/30
Host 2 Host 2
R1----------------------------R2----------------------------R3
| | |
Host 30 Host 30 Host 30
192.168.1.0/27 192.168.1.32/27 192.168.1.64/27
-Network : 5 , Host 30
-2^n-2 = 30 : n = 5
-192.168.1.000 00000 = 192.168.1.0/27
-192.168.1.001 00000 = 192.168.1.32/27
-192.168.1.010 00000 = 192.168.1.64/27
-192.168.1.011 00000 = 192.168.1.96/27
-192.168.1.100 00000 = 192.168.1.128/27
-192.168.1.101 00000 = 192.168.1.160/27
-192.168.1.110 00000 = 192.168.1.192/27
-192.168.1.111 00000 = 192.168.1.224/27
-Host 2 = 2^n-2 = 2 : n = 2
-192.168.1.011 000 00 = 192.168.1.96/30
-192.168.1.011 001 00 = 192.168.1.100/30
-192.168.1.011 010 00 = 192.168.1.104/30
-192.168.1.011 011 00 = 192.168.1.108/30
-192.168.1.011 100 00 = 192.168.1.112/30
-192.168.1.011 101 00 = 192.168.1.116/30
-192.168.1.011 110 00 = 192.168.1.120/30
-192.168.1.011 111 00 = 192.168.1.123/30
예제 2)
-133.200.0.0/16
-Host : 4000
-Host : 3500
-Host : 2500
-Host : 1000
-Host : 500
-Host : 230
-Host : 25
-Host : 22
-Host : 2 - 7
-133.200.0000 0000.00000000 = Host 4000 = 133.200.0.0/20 (133.200.0.0 ~ 133.200.15.255)
-133.200.0001 0000.00000000 = Host 3500 = 133.200.16.0/20 (133.200.16.0 ~ 133.200.31.255)
-133.200.0010 0000.00000000 = Host 2500 = 133.200.32.0/20 (133.200.32.0 ~ 133.200.47.255)
-133.200.0011 00 00.00000000 = Host 1000 = 133.200.48.0/22 (133.200.48.0 ~ 133.200.51.255)
-133.200.0011 01 0 0.00000000 = Host 500 = 133.200.52.0/23 (133.200.52.0 ~ 133.200.53.255)
-133.200.0011 01 1 0. 00000000 =Host 230 = 133.200.54.0/24 (133.200.54.0 ~ 133.200.54.255)
-133.200.0011 01 1 1. 000 00000 = Host 25 = 133.200.55.0/27
-133.200.0011 01 1 1. 001 00000 = Host 22 = 133.200.55.32/27
-133.200.0011 01 1 1. 010 000 00 = Host 2 = 133.200.55.64/30
-133.200.0011 01 1 1. 010 001 00 = Host 2 = 133.200.55.68/30
-133.200.0011 01 1 1. 010 010 00 = Host 2 = 133.200.55.72/30
-133.200.0011 01 1 1. 010 011 00 = Host 2 = 133.200.55.76/30
-133.200.0011 01 1 1. 010 100 00 = Host 2 = 133.200.55.80/30
-133.200.0011 01 1 1. 010 101 00 = Host 2 = 133.200.55.84/30
-133.200.0011 01 1 1. 010 110 00 = Host 2 = 133.200.55.88/30
-133.200.0011 01 1 1. 010 111 00 = Host 2 = 133.200.55.92/30
-133.200.0011 01 1 1. 011 00000 = 133.200.55.96/27
-133.200.0011 01 1 1. 100 00000 = 133.200.55.128/27
-133.200.0011 01 1 1. 101 00000 = 133.200.55.160/27
-133.200.0011 01 1 1. 110 00000 = 133.200.55.192/27
-133.200.0011 01 1 1. 111 00000 = 133.200.55.224/27
-133.200.0011 10 00.00000000 = Host 1024
-133.200.0011 11 00.00000000 = Host 1024
-133.200.0100 0000.00000000 = Host 4096
-133.200.0101 0000.00000000 = Host 4096
-133.200.0110 0000.00000000 = Host 4096
-133.200.0111 0000.00000000 = Host 4096
-133.200.1000 0000.00000000 = Host 4096
-133.200.1001 0000.00000000 = Host 4096
-133.200.1010 0000.00000000 = Host 4096
-133.200.1011 0000.00000000 = Host 4096
-133.200.1100 0000.00000000 = Host 4096
-133.200.1101 0000.00000000 = Host 4096
-133.200.1110 0000.00000000 = Host 4096
-133.200.1111 0000.00000000 = Host 4096
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