Hi Rene,
Please help! My topology is simple. R1–FW–R2. I am running ospf between R1 and R2. Firewall between R1 and R2 is transparent. R1 and R2 are able to ping each other through the firewall. However, I keep getting this error message. The hello and dead timer are identical on both R1 and R2. The neighbor already formed. However, it will disconnect and re-form back and forth…
*Mar 1 03:11:10.743: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on FastEthernet0/1 from FULL to DOWN, Neighbor Down: Dead timer expired
--More--
*Mar 1 03:11:15.243: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on FastEthernet0/1 from LOADING to FULL, Loading Done
R1#sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 1 FULL/DR 00:00:34 192.168.2.2 FastEthernet0/1
```
R1#
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
passive-interface default
no passive-interface FastEthernet0/1
network 192.168.2.0 0.0.0.255 area 0
R2#
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
passive-interface default
no passive-interface FastEthernet0/1
network 192.168.2.0 0.0.0.255 area 0
```