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10-01-2012 11:40 AM - edited 03-07-2019 09:12 AM
Hi,
I'm studying for my CCNA exam
I'm busy seting up a lab with ospf + nat in GNS3.
I'm having problems getting R2 and R3 and clients C2 C3 to be translated true NAT.
I get destination unreachable. So this means i don't have route for them.
This is my config
Can somebody tell me what route i have to add to get this working.
This is config R1
ip dhcp pool chris
network 10.10.10.0 255.255.255.0
lease 7
!
!
ip domain name lab.local
!
interface Loopback0
no ip address
!
interface FastEthernet0/0
no ip address
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
!
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 10.10.10.254 255.255.255.0
!
interface FastEthernet0/0.20
encapsulation dot1Q 20
ip address 10.10.20.254 255.255.255.0
!
interface Serial0/0
ip address 172.16.50.1 255.255.255.252
ip nat inside
ip virtual-reassembly
clock rate 2000000
!
interface FastEthernet0/1
description Connection to internet
ip address dhcp
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
clock rate 2000000
!
router ospf 5
log-adjacency-changes
network 10.10.10.0 0.0.0.255 area 0
network 10.10.20.0 0.0.0.255 area 0
network 172.16.50.0 0.0.0.3 area 0
!
!
!
no ip http server
no ip http secure-server
ip nat inside source list 5 interface FastEthernet0/1 overload
!
access-list 5 permit any
Int f0/1 is the connection to internet.
It passes true 192.168.0.1(gateway ISP home network) and has address 192.168.0.240
These are the routes
Gateway of last resort is 192.168.0.1 to network 0.0.0.0
172.16.0.0/30 is subnetted, 2 subnets
O 172.16.50.4 [110/128] via 172.16.50.2, 00:09:14, Serial0/0
C 172.16.50.0 is directly connected, Serial0/0
10.0.0.0/24 is subnetted, 4 subnets
C 10.10.10.0 is directly connected, FastEthernet0/0.10
C 10.10.20.0 is directly connected, FastEthernet0/0.20
O 10.10.30.0 [110/74] via 172.16.50.2, 00:09:14, Serial0/0
O 10.10.40.0 [110/138] via 172.16.50.2, 00:09:14, Serial0/0
C 192.168.0.0/24 is directly connected, FastEthernet0/1
S* 0.0.0.0/0 [254/0] via 192.168.0.1
This is route R2
Gateway of last resort is not set
172.16.0.0/30 is subnetted, 2 subnets
C 172.16.50.4 is directly connected, Serial0/1
C 172.16.50.0 is directly connected, Serial0/0
10.0.0.0/24 is subnetted, 4 subnets
O 10.10.10.0 [110/74] via 172.16.50.1, 00:10:04, Serial0/0
O 10.10.20.0 [110/74] via 172.16.50.1, 00:10:04, Serial0/0
C 10.10.30.0 is directly connected, FastEthernet0/0.30
O 10.10.40.0 [110/74] via 172.16.50.6, 00:10:04, Serial0/1
Do i need to at a default network or static route of 0.0.0.0 ?
Kind regards
Christ
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10-01-2012 11:57 AM
Hello Chris,
Yes you need to have default route configured on R2 and R3
On R2 you configure default route towards 172.16.50.1
and on R3 you can do it towards the other end IP of the point to point serial connected to R2
Please let me know if you have further questions
Harish
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10-01-2012 11:49 AM
Hello Chris
Where is your clients connected to I mean behind which router ?
regards
harish.
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10-01-2012 11:53 AM
hi thx for fast reply
there behind R2 and R3
i've added pic in attachment (lab design)
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10-01-2012 11:57 AM
Hello Chris,
Yes you need to have default route configured on R2 and R3
On R2 you configure default route towards 172.16.50.1
and on R3 you can do it towards the other end IP of the point to point serial connected to R2
Please let me know if you have further questions
Harish
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10-01-2012 12:04 PM
thank you very much Harish
