一.測試拓撲
二.測試思路
1.分別測試tcp和udp的連續端口PAT
2.再用靜態端口轉換工具分別將TCP端口和udp端口轉換到某個常用端口進行測試
---tcp轉換到TCP23,用telnet測試
---udp轉換到UDP514,用syslog發送進行測試
3.爲了測試方便,防火牆只設兩個區Outside和Inside
---將Inside服務器的TCP1000~2000映射到防火牆Outside口的TCP1000~2000上
---將Inside服務器的UDP1000~2000映射到防火牆Outside口的UPD2000~3000上
4.測試發現如果TCP端口範圍與UDP端口範圍一樣,第二個NAT配置不上,會報如下錯誤:
ERROR: NAT unable to reserve ports.
三.基本配置
1.Outside服務器
IP:202.100.1.8/24
2.防火牆ASA842
interface GigabitEthernet0
nameif Outside
security-level 0
ip address 202.100.1.10 255.255.255.0
!
interface GigabitEthernet1
nameif Inside
security-level 100
ip address 10.1.1.10 255.255.255.0
3.Intside服務器
IP:10.1.1.8/24
GW:10.1.1.10
四.靜態PAT端口範圍配置
1.定義端口範圍對象
object network Inside_Server
host 10.1.1.8
object service tcp_ports
service tcp destination range 1000 2000
object service udp_ports
service udp destination range 2000 3000
2.配置twice-nat
nat (outside,inside) source static any any destination static interface Inside_Server service tcp_ports tcp_ports
nat (outside,inside) source static any any destination static interface Inside_Server service udp_ports udp_ports
3.配置並應用防火牆策略
access-list Outside extended permit tcp any object Inside_Server range 1000 2000
access-list Outside extended permit udp any object Inside_Server range 2000 3000
access-group Outside in interface Outside
4.測試驗證
---可以用多種方式驗證,如果進行靜態端口轉換嫌麻煩,可以直接抓包驗證