Guide or instruction about build and config NAT for network.

[eitt.world]

Hey everybody. I’m having learn CCNA CISCO, I have a problem when I build a network, a network required that: Construct and build a topo network have 4 Router, 6 Switch, 8 PC, auto set and config IP address for communication between equipment in your topo network. Give some suggest : 3->4 IP front, 1 range 4 IP route, 2 range 8 IP route, 1 range 16 IP route. Les’t raise, give method and config NAT for it network with: Static NAT, Dynamic NAT, PAT and NAT co-ordinate.

Please give some guide or instruction me about that lab, Thank very much

[eitt.world]

who know? please help me ? I need some guide or opinion ?

[blau grana]

Hello Mai,

Here are some tutorials how to configure NAT. Do you have problems with something particular?

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094e77.shtml

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/260-cisco-router-nat-overload.html

Best Regards

Please rate all helpful posts and close solved questions

[eitt.world]

Hey all here is a topo (model) network I do by myself and I have cofig NAT for it. Please see, check, fix error or guide me to fix error if it have error. Thank very much.

As a subject I have propose use a IP range is 200.200.5.1/27

b/Static NAT for IP PC8 192.16.6.1 to become IP 200.200.5.1 with a Network outside.

Router3(config)#ip nat inside source static 192.168.1.2 200.200.5.1

Router3(config)#interface fa 1/0

Router3(config-if)#ip nat inside

Router3(config-if)#interface s 0/0

Router3(config-if)#ip nat outside

a/ Accept PC in LAN 192.168.5.1/24 go out internet, this IP will be nat by IP range 200.200.5.1-> 200.200.5.6 (IP 200.200.5.1 have use for Static NAT but we can reuse).

Router3(config)#access-list 1 permit 192.168.5.0 0.0.0.255

Router3(config)#ip nat pool natdong 200.200.5.1 200.200.5.6 netmask 255.255.255.248

Router3(config)#ip nat inside source list 1 pool natdong

Router3(config)#interface fa 0/0

Router3(config-if)#ip nat inside

Router3(config-if)#interface s 0/0

Router3(config-if)#ip nat outside

c/ Accept PC in 2 LAN 192.168.1.0/24 and 192.168.2.0/24 go out internet, this IP range will be NAT by IP range 200.200.5.33-> 200.200.5.48 (16 Ip address)

Router3(config)#access-list 1 permit 192.168.1.0 0.0.0.255

Router3(config)#access-list 1 permit 192.168.2.0 0.0.0.255

Router3(config)#ip nat pool natpat 200.200.5.33 200.200.5.48 netmask 255.255.255.224

Router3(config)#ip nat inside source list 1 interface serial 0/0 overload

Router3(config)#ip nat inside source list 1 pool natpat overload

Router3(config)#interface fa 0/0

Router3(config-if)#ip nat inside

Router3(config)#interface fa 1/0

Router3(config-if)#ip nat inside

Router3(config-if)#interface s 0/0

Router3(config-if)#ip nat outside

[b]Note: My ability of English is not good so please sympathize for spelling mistake[/b]

[eitt.world]

who know ? plz see and fix it for me, I have do it above.

[blau grana]

Hello Mai,

You did not mentioned what is working and what is not, it is hard to assume what could be wrong.

Also you have some typos in your post:

b/Static NAT for IP PC8 192.16.6.1 to become IP 200.200.5.1 with a Network outside.

Router3(config)#ip nat inside source static 192.168.1.2 200.200.5.1

- you said that 192.168.6.1 will be NATed to 200.200.5.1, but you have configured "1.2"

Router3(config)#ip nat inside source list 1 pool natdong

- you should configure overload keyword here, it is PAT - port address translation

Router3(config)#access-list 1 permit 192.168.1.0 0.0.0.255

Router3(config)#access-list 1 permit 192.168.2.0 0.0.0.255

Router3(config)#ip nat pool natpat 200.200.5.33 200.200.5.48 netmask 255.255.255.224

Router3(config)#ip nat inside source list 1 interface serial 0/0 overload

Router3(config)#ip nat inside source list 1 pool natpat overload

- I do not understand why did you configure two NAT rules, you need just one rule.

- this entire condif should be configured on Router 1 because "1" and "2" networks are terminated there.

Best Regards

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