What am I doing wrong?

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Hello guys and girls....

I have done this assessment for my college course in packet tracer and now something is missing or done wrong.

I can ping R2 from any computer.
I can ping R1 from any computer.
I can't ping the ISP router from any computer.
I can ping ISP from R1.

I am using OSPF and I have set a default route that is being advertised by OSPF.

Why can't I ping the ISP from my local computers or from my R1?

Here's the run info of my SW and Ro...

R1
*********************************************************
R1#sh run
Building configuration...
Current configuration : 510 bytes
version 12.2
no service password-encryption

hostname R1

ip ssh version 1

interface FastEthernet0/0
ip address 172.31.1.253 255.255.255.0
duplex auto
speed auto

interface Serial1/0
ip address 172.31.4.6 255.255.255.252
encapsulation ppp
ip ospf priority 0
clock rate 4000000

router ospf 1
log-adjacency-changes
network 172.31.1.0 0.0.0.255 area 0
default-information originate

ip classless
ip route 0.0.0.0 0.0.0.0 172.31.4.5

line con 0
line vty 0 4
login

end
R1#

R2
****************************************************
R2#sh run
Building configuration...

Current configuration : 901 bytes

version 12.2
no service password-encryption

hostname R2

ip ssh version 1

interface FastEthernet0/0
no ip address
duplex auto
speed auto

interface FastEthernet0/0.1
encapsulation dot1Q 1 native
ip address 172.31.1.254 255.255.255.0

interface FastEthernet0/0.2
encapsulation dot1Q 2
ip address 172.31.2.254 255.255.255.0

interface FastEthernet0/0.3
encapsulation dot1Q 3
ip address 172.31.3.254 255.255.255.0

router ospf 1
log-adjacency-changes
network 172.31.1.0 0.0.0.255 area 0
network 172.31.2.0 0.0.0.255 area 0
network 172.31.3.0 0.0.0.255 area 0

ip classless

ip dhcp pool VLan1
network 172.31.1.0 255.255.255.0
default-router 172.31.1.254
ip dhcp pool VLan2
network 172.31.2.0 255.255.255.0
default-router 172.31.2.254
ip dhcp pool VLan3
network 172.31.3.0 255.255.255.0
default-router 172.31.3.254

line con 0
line vty 0 4
login

end

R2#

S1
***************************************************
S1#sh run
Building configuration...

Current configuration : 1044 bytes

version 12.2
no service password-encryption

hostname S1

interface FastEthernet0/1
switchport access vlan 2

interface FastEthernet0/2
switchport access vlan 3

interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/24
switchport mode trunk
!
interface GigabitEthernet1/1
!
interface GigabitEthernet1/2
!
interface Vlan1
ip address 172.31.1.250 255.255.255.0
!
ip default-gateway 172.31.1.254
!
line con 0
!
line vty 0 4
login
line vty 5 15
login
!
!
end

S1#

S2
*******************************************************
S2#sh run
Building configuration...

Current configuration : 1067 bytes
!
version 12.2
no service password-encryption
!
hostname S2
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
switchport access vlan 2
!
interface FastEthernet0/4
switchport access vlan 3
!
interface FastEthernet0/23
switchport mode trunk
!
interface FastEthernet0/24
switchport mode trunk
!
interface GigabitEthernet1/1
!
interface GigabitEthernet1/2
!
interface Vlan1
ip address 172.31.1.251 255.255.255.0
!
ip default-gateway 172.31.1.254
!
line con 0
!
line vty 0 4
login
line vty 5 15
login
!
!
end


S2#

I am sorry for the length of this post but I am totally clueless of what have I done wrong.
Any help well appreciated.
Cheers.

 

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I cant see any mention of NAT in your config ... so traffic will be dropped at the point of it hitting the ISP's router.

 

Sorry ignore me, helps if i actually look at your diagram and pay attention to your question! .... ignore that comment i can see you are also simulating your ISP within your lab on private IPs

 

I presume if you can ping the ISP router from only R1 which is directly connected to it, it must be a routing issue of some kind... like no route back to your network

Can we see the config of the ISP router?

 

Hello everybody.

Gott it finally.

Forgot to set a default route on the ISP router.

ip route 0.0.0.0 0.0.0.0 s1/0

Now it works fine.

Thanks