Ping between Routers Issue

based In the topology below:
 I can ping from R4 all the way to R3 S1/1 interface but not to R3 interface S1/2.
I can ping from R5 to R3 interface S1/1 but cannot ping R2 S1/1

I know that I have configured Default Route, however I am not sure if that can be the issue.
I will post the Configuration of R5 and R3 now and if you need more information, please let me know.
Thank you.

ping
 R5#sh run
Building configuration...

Current configuration : 1179 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R5
!
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
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial1/0
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/2
 ip address 3.3.3.5 255.255.255.0
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 3.3.3.3
!
no ip http server
no ip http secure-server
!
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

R5#
========================================

R3#sh run
Building configuration...

Current configuration : 1217 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
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
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial1/0
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/1
 ip address 1.1.1.3 255.0.0.0
 serial restart-delay 0
!
interface Serial1/2
 ip address 3.3.3.3 255.255.255.0
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 1.1.1.2
ip route 0.0.0.0 0.0.0.0 3.3.3.5
!
no ip http server
no ip http secure-server
!
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

R3#
============================

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jskfanAsked:
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Don JohnstonInstructorCommented:
You can't have two default routes going to different networks.  

Remove the default route on R3 pointing to R5.

Also, post the routing tables of all the routers.
0
jskfanAuthor Commented:
Routing Tables

R5#sh ip route
 Gateway of last resort is 3.3.3.3 to network 0.0.0.0

     3.0.0.0/24 is subnetted, 1 subnets
C       3.3.3.0 is directly connected, Serial1/2
S*   0.0.0.0/0 [1/0] via 3.3.3.3
R5#

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R4#sh ip route
 
Gateway of last resort is 2.2.2.2 to network 0.0.0.0

C    2.0.0.0/8 is directly connected, Serial1/2
S*   0.0.0.0/0 [1/0] via 2.2.2.2
R4#

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R3#sh ip route
       
Gateway of last resort is 3.3.3.5 to network 0.0.0.0

C    1.0.0.0/8 is directly connected, Serial1/1
     3.0.0.0/24 is subnetted, 1 subnets
C       3.3.3.0 is directly connected, Serial1/2
S*   0.0.0.0/0 [1/0] via 3.3.3.5
               [1/0] via 1.1.1.2
R3#

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R2#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 2.2.2.4 to network 0.0.0.0

C    1.0.0.0/8 is directly connected, Serial1/1
C    2.0.0.0/8 is directly connected, Serial1/2
S*   0.0.0.0/0 [1/0] via 2.2.2.4
               [1/0] via 1.1.1.3
R2#

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0
Don JohnstonInstructorCommented:
Your first problem is that you have multiple default routes on a couple of the routers.

Delete the additional default routes and create some static routes to specific networks.
0

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jskfanAuthor Commented:
Thanks DON

I have deleted Default Route and replaced it by static route on all routers. Now I can ping from End to End and back...
0
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