11-27-2019 03:27 PM
Hello. I am working on a school project and I am very new to networking in general. I have a small network simulation made in GNS 3 with 3 routers (Cisco c2691) connected to each other. Here is the set up below:
My problem is that I am getting Internet on R1 but not on R2 and R3. I cannot even ping 8.8.8.8 from R2 but doing so from R1 works. All of them are routed through OSPF. Here are the configurations of R1 and R2 respectively:
R1:
! ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R1 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 no ip icmp rate-limit unreachable ip cef ! ! ! ! no ip domain lookup ip auth-proxy max-nodata-conns 3 ip admission max-nodata-conns 3 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ip tcp synwait-time 5 ! ! ! ! ! interface FastEthernet0/0 ip address dhcp duplex auto speed auto ! interface FastEthernet0/1 ip address 192.168.0.254 255.255.255.0 duplex auto speed auto ! interface FastEthernet1/0 ! interface FastEthernet1/1 ! interface FastEthernet1/2 ! interface FastEthernet1/3 ! interface FastEthernet1/4 ! interface FastEthernet1/5 ! interface FastEthernet1/6 ! interface FastEthernet1/7 ! interface FastEthernet1/8 ! interface FastEthernet1/9 ! interface FastEthernet1/10 ! interface FastEthernet1/11 ! interface FastEthernet1/12 ! interface FastEthernet1/13 ! interface FastEthernet1/14 ! interface FastEthernet1/15 ! interface Vlan1 no ip address ! router ospf 1 log-adjacency-changes area 1 virtual-link 192.168.0.1 area 2 virtual-link 192.168.0.2 network 192.168.0.0 0.0.0.255 area 0 ! ip forward-protocol nd ! ! no ip http server no ip http secure-server ! no cdp log mismatch duplex ! ! ! control-plane ! ! ! ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 privilege level 15 logging synchronous line aux 0 exec-timeout 0 0 privilege level 15 logging synchronous line vty 0 4 login ! ! end
R2:
! ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R2 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 no ip icmp rate-limit unreachable ip cef ! ! ! ! no ip domain lookup ip auth-proxy max-nodata-conns 3 ip admission max-nodata-conns 3 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ip tcp synwait-time 5 ! ! ! ! ! interface FastEthernet0/0 ip address 192.168.0.1 255.255.255.0 duplex auto speed auto ! interface FastEthernet0/1 ip address 192.168.1.254 255.255.255.0 duplex auto speed auto ! interface FastEthernet1/0 ! interface FastEthernet1/1 ! interface FastEthernet1/2 ! interface FastEthernet1/3 ! interface FastEthernet1/4 ! interface FastEthernet1/5 ! interface FastEthernet1/6 ! interface FastEthernet1/7 ! interface FastEthernet1/8 ! interface FastEthernet1/9 ! interface FastEthernet1/10 ! interface FastEthernet1/11 ! interface FastEthernet1/12 ! interface FastEthernet1/13 ! interface FastEthernet1/14 ! interface FastEthernet1/15 ! interface Vlan1 no ip address ! router ospf 1 log-adjacency-changes area 1 virtual-link 192.168.0.254 network 192.168.0.0 0.0.0.255 area 0 network 192.168.1.0 0.0.0.255 area 1 ! ip forward-protocol nd ! ! no ip http server no ip http secure-server ! no cdp log mismatch duplex ! ! ! control-plane ! ! ! ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 privilege level 15 logging synchronous line aux 0 exec-timeout 0 0 privilege level 15 logging synchronous line vty 0 4 login ! ! end
I tried doing NAT on R1 as follows:
R1(config)# int f0/0 R1(config-if)# ip nat outside R1(config-if)# ex R1(config)# int f0/1 R1(config-if)# ip nat inside R1(config-if)# ex R1(config)# access-list 100 remark R1(config)# access-list 100 permit ip 192.168.0.0 0.0.0.255 any R1(config)# ip nat inside source list 100 interface f0/0 overload
But that did not help either. Is there any way to get internet traffic in R2/R3 and every other network connected to it? Any help would be really appreciated as I have tried every possible way I know of.
Solved! Go to Solution.
11-28-2019 01:04 AM
Hello,
Paul's suggestion does the trick, the 'default-information originate always' sends the default route to the other routers. For the sake of completeness, if you do want to use different areas, below are the configs you could use (I added loopback which are typically used as router IDs for OSPF, and an IOS DHCP server to R2 for your VPCS client):
R1
hostname R1
!
interface Loopback 1
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
ip address dhcp
ip nat outside
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.0.254 255.255.255.0
ip nat inside
duplex auto
speed auto
!
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
network 192.168.0.0 0.0.0.255 area 0
default-information originate always
!
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0 dhcp
!
ip nat inside source list 1 interface FastEthernet0/0 overload
!
access-list 1 permit 192.168.0.0 0.0.255.255
R2
hostname R2
!
ip dhcp excluded-address 192.168.1.254
!
ip dhcp pool LAN
network 192.168.1.0 255.255.255.0
default-router 192.168.1.254
dns-server 8.8.8.8 8.8.4.4
!
interface Loopback 2
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.1.254 255.255.255.0
duplex auto
speed auto
!
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
network 192.168.0.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 1
R3
hostname R3
!
interface Loopback 3
ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.0.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.2.254 255.255.255.0
duplex auto
speed auto
!
router ospf 1
router-id 3.3.3.3
log-adjacency-changes
network 192.168.0.0 0.0.0.255 area 0
network 192.168.2.0 0.0.0.255 area 2
11-27-2019 04:21 PM
Hello,
remove all the virtual links from all 3 routers.
11-27-2019 04:30 PM
11-27-2019 05:07 PM
Hello,
can you ping the WAN IP address of R1 from R2 and R3 ?
11-27-2019 05:20 PM
11-27-2019 05:48 PM
Hello,
on R1, add a static default route:
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0 dhcp
11-27-2019 06:51 PM - edited 11-27-2019 06:57 PM
Hello
R1
router ospf 1
network 192.168.0.1 0.0.0.0 area 0
default-information originate always
ip route 0.0.0.0 0.0.0.0 fa0/0 dhcp
access-list 1 permit 192.168.0.0 0.0.0.255
access-list 1 permit 192.168.1.0 0.0.0.255
access-list 1 permit 192.168.2.0 0.0.0.255
ip nat inside source list 1 interface fa0/0 overload
R2
router ospf 1
network 192.168.0.1 0.0.0.0 area 0
network 192.168.1.254 0.0.0.0 area 0
R3
router ospf 1
network 192.168.0.2 0.0.0.0 area 0
network 192.168.2.254 0.0.0.0 area 0
11-28-2019 01:04 AM
Hello,
Paul's suggestion does the trick, the 'default-information originate always' sends the default route to the other routers. For the sake of completeness, if you do want to use different areas, below are the configs you could use (I added loopback which are typically used as router IDs for OSPF, and an IOS DHCP server to R2 for your VPCS client):
R1
hostname R1
!
interface Loopback 1
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
ip address dhcp
ip nat outside
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.0.254 255.255.255.0
ip nat inside
duplex auto
speed auto
!
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
network 192.168.0.0 0.0.0.255 area 0
default-information originate always
!
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0 dhcp
!
ip nat inside source list 1 interface FastEthernet0/0 overload
!
access-list 1 permit 192.168.0.0 0.0.255.255
R2
hostname R2
!
ip dhcp excluded-address 192.168.1.254
!
ip dhcp pool LAN
network 192.168.1.0 255.255.255.0
default-router 192.168.1.254
dns-server 8.8.8.8 8.8.4.4
!
interface Loopback 2
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.1.254 255.255.255.0
duplex auto
speed auto
!
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
network 192.168.0.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 1
R3
hostname R3
!
interface Loopback 3
ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.0.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.2.254 255.255.255.0
duplex auto
speed auto
!
router ospf 1
router-id 3.3.3.3
log-adjacency-changes
network 192.168.0.0 0.0.0.255 area 0
network 192.168.2.0 0.0.0.255 area 2
11-28-2019 06:49 AM - edited 11-28-2019 06:50 AM
Thank you so much! I do need 3 different areas.
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