Should be a very simple one this don't know what I'm doing wrong. Why can't
I ping my own interface or the remote end. Back to back serial cable

Here is the config of router gazdav attatched via s0 to S1 of router 2511.

gazdav#sh ru
Building configuration...

Current configuration:
!
version 12.0
service timestamps debug datetime msec
service timestamps log uptime
service password-encryption
!
hostname gazdav
!
enable secret 5 $1$FgI.$bygzIO/R77k37T.qfBWhH.
!
username gazdav password 7 xxxxxxxx
username pinger password 7 xxxxxxx
username ping privilege 5 password 7 xxxxxxx!
!
!
!
ip subnet-zero
no ip finger
no ip domain-lookup
!
isdn switch-type basic-net3
isdn voice-call-failure 0
!
!
!
interface Ethernet0
 ip address 10.10.1.1 255.255.255.0
 no ip directed-broadcast
 ip nat inside
 no ip route-cache
 no ip mroute-cache
!
interface Serial0
 ip address 172.16.10.6 255.255.255.252
 no ip directed-broadcast
 encapsulation ppp
!
interface BRI0
 bandwidth 64
 ip address negotiated
 no ip directed-broadcast
 ip nat outside
 encapsulation ppp
 no ip route-cache
 no ip mroute-cache
 no keepalive
 dialer idle-timeout 150
 dialer string 08089933000
 dialer-group 2
 isdn switch-type basic-net3
 ppp authentication chap callin
 ppp chap hostname gazdav
 ppp chap password 7 xxxxxx
!
router ospf 101
 network 10.10.1.0 0.0.0.255 area 0
 network 172.16.10.4 0.0.0.0 area 0
!
ip nat inside source list 100 interface BRI0 overload
ip classless
no ip http server
!
logging 10.10.1.2
access-list 1 permit 10.10.1.2
access-list 100 permit ip 10.10.1.0 0.0.0.255 any
access-list 101 deny   udp any any eq snmp
access-list 101 deny   udp any any eq ntp
access-list 101 permit ip any any
access-list 110 deny   udp 10.10.1.0 0.0.0.255 eq netbios-ns any log
dialer-list 1 protocol ip list 110
dialer-list 2 protocol ip permit
snmp-server engineID local 00000009020000605CBC2B55
snmp-server community public RW
!
line con 0
 exec-timeout 0 0
 transport input none
line vty 0
 exec-timeout 0 0
 privilege level 5
 password 7 xxxxxxx
 no login
 length 25
 transport input telnet
line vty 1 4
 exec-timeout 0 0
 privilege level 5
 password 7 xxxxxxx
 no login
 transport input telnet
!
end


And here is the config of the router at the other end.

2511#sh ru
Building configuration...

Current configuration : 968 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname 2511
!
enable secret 5 $1$aJT7$r0fZD.akp8IAaWZEYJuxD1
!
ip subnet-zero
no ip domain-lookup
!
ip ssh time-out 120
ip ssh authentication-retries 3
!
!
!
!
interface Ethernet0
 ip address 10.10.1.10 255.255.255.0
 no ip route-cache
 no ip mroute-cache
 shutdown
!
interface Serial0
 ip address 172.16.10.5 255.255.255.252
 encapsulation ppp
 no ip route-cache
 no ip mroute-cache
 no fair-queue
 clockrate 64000
!
interface Serial1
 ip address 172.16.20.5 255.255.255.252
 no ip route-cache
 no ip mroute-cache
 clockrate 64000
!
router ospf 100
 log-adjacency-changes
 network 172.16.10.4 0.0.0.0 area 0
 network 172.16.20.4 0.0.0.0 area 0
!
ip classless
no ip http server
!
!
line con 0
 exec-timeout 0 0
line 1 16
 transport input all
line aux 0
 transport input all
line vty 0 4
 no login
!




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