20201209 cisco VRF & OSPF

課堂資料

Virtual routing and forwardingWikipedia

https://kknews.cc/zh-tw/code/4j9pp6q.htmlkknews.cc

NAT 網路位址轉換 - Jan Ho 的網絡世界Jan Ho 的網絡世界

Virtual Routing and Forwarding

Virtual Routing and Forwarding(VRF)：虛擬路由和轉發，為第三層的網路虛擬化。

課堂練習

VRF

R1 ( Blue 01 )

int e0/0

ip add 192.168.1.1 255.255.255.0

no shut

exit

R2 ( Red 01 )

R3 ( Blue 02 )

R4 ( Red 02 )

R5 ( ISP )

OSPF

R1 ( Blue 01 )

router ospf 1

network 192.168.1.0 0.0.0.255 area 0

network 1.1.1.1 0.0.0.0 area 0

R2 ( Red 01 )

R3 ( Blue 02 )

R4 ( Red 02 )

R5 ( ISP )

• Dynamic NAT ( DAT )：Many to Many Mopping

• Port NAT ( PAT ) ：Many to 1

• Static NAT：1 to 1

Part 01.

R1

int e0/0

ip add 12.1.1.1 255.255.255.0

no shut

int lo1

ip add 192.168.1.1 255.255.255.0

no shut

int lo2

ip add 192.168.2.1 255.255.255.0

no shut

exit

ip route 0.0.0.0 0.0.0.0 12.1.1.2

do ping 12.1.1.2

do ping 23.1.1.3

do ping 23.1.1.3 source 192.168.1.1

do ping 23.1.1.3 source 192.168.2.1

ping 3.3.3.3 source 192.168.1.1

R2

R3

Part 02.

Linux

ifconfig eth0 192.168.3.2/24

ip addr add 192.168.3.2/24 brd + dev eth0

ip route add default via 192.168.3.1

ping 192.168.3.1

ping 12.1.1.1

ping 12.1.1.2

ping 23.1.1.2

ip route add default 192.168.3.2/24 brd + dev eth0

wireshark

telnet 23.1.1.3

R1

R2

R3

Part 03.

R1

int e0/0

ip add 12.1.1.1 255.255.255.0

no shut

exit

ip route 0.0.0.0 0.0.0.0 12.1.1.2

line vty 0 4

password cisco

login

transport input telnet

R2

R3