Static NAT , OSPF Null route redistribution , Expiry problem

satishtech

My configuration :

Router 0 :

router ospf 10
log-adjacency-changes
redistribute static subnets
network 192.168.10.0 0.0.0.255 area 0
network 172.168.0.0 0.0.255.255 area 0
!
ip nat inside source static 192.168.10.2 193.10.8.2
ip classless
ip route 193.10.8.0 255.255.255.0 Null0

Router 1 :

router ospf 11
log-adjacency-changes
network 172.168.0.0 0.0.255.255 area 0
network 10.0.0.0 0.255.255.255 area 0

After a while I get NAT IP expiry messages, after I turn on nat debugging ?
NAT*: s=192.168.10.2->193.10.8.2, d=10.1.1.2 [13]

NAT*: s=10.1.1.2, d=193.10.8.2->192.168.10.2 [21]

NAT: expiring 193.10.8.2 (192.168.10.2) icmp 1 (1)

NAT: expiring 193.10.8.2 (192.168.10.2) icmp 2 (2)

Than I cannot connect to the web server(192.168.10.2)
connected to Router 0 ?

next I get

NAT: s=10.1.1.2, d=193.10.8.2->192.168.10.2 [22]

NAT*: s=192.168.10.2->193.10.8.2, d=10.1.1.2 [14]

now I can connect.

I see this expiring coming and going in NAT and during that
period I was not able to connect to the web server before ,
but it is working ok now ?

ip nat translation timeout command is not in packet tracer.

networker050184

Packet tracer is probably the worst place to test stuff besides some syntax. It's just not a full IOS or hardware to get any kind of accurate testing on timers etc.