[DAY32] NAT 개념 & 실습

NAT란? 

(네트워크 주소 변환(Network Address Translation))

 

정적 NAT  =  사설 IP와 공인IP 1:1 매칭     웹서버( 고정된 IP)
동적 NAT  = 클라이언트가 요청하는 순서대로 공인 IP 주소를 부여
NAT 오버로딩 = 여러개의 사설 IP를 하나의 공인 IP 주소로 변환할 때 사용

 

<NAT 기초 실습예제>

 

1. 정적 NAT

R1(config)# ip nat inside source static 192.168.1.2 203.230.7.3

R1(config)# int fa0/0

R1(config-if)# ip nat outside

R1(config-if)# exit

R1(config)# int fa0/1

R1(config-if)# ip nat inside

 

2. 동적 NAT

R1(config)# ip nat pool bitc 203.230.7.7 203.230.7.15 netmask 255.255.255.0

R1(config)# ip nat inside source list 100 pool bitc

R1(config)# access-list 100 permit ip host 192.168.1.0 0.0.0.255 host any

 

3. NAT overloading = PAT(Port Address Translation)

R1(config)#ip nat inside source list 100 interface fa0/0 overload

R1(config)#access-list 100 permit ip host 192.168.1.2 150.183.235.0 0.0.0.255

 

 

#do show ip nat translations << 설정 확인