First, I installed CentOS 5.5 and Quagga 0.99.17.
Then I configure to run OSPF v2 on R1 and R2 following below

R1
interface eth0
ip address 192.168.10.1/24
!
interface lo
ip address 10.0.0.1/24
!
router ospf
ospf router-id 10.0.0.1
redistribute connected
network 192.168.10.0/24 area 0.0.0.0
default-information originate always
!
ip forwarding


R2
interface eth0
ip address 192.168.10.2/24
!
interface lo
ip address 11.0.0.1/24
!
router ospf
ospf router-id 11.0.0.1
redistribute connected
network 192.168.10.0/24 area 0.0.0.0
!
ip forwarding

I added --> #echo "1" > /proc/sys/net/ipv4/ip_forward
to forward packet on centos

Can anyone help me about that?
THank you!
Tou

Hi there,

Check the hello and dead packet intervals on both the routers. Check them using:

show ip ospf interface configured_interface

You can set them using the following commands:

ip ospf hello-interval seconds
ip ospf dead-interval seconds

Thank .... T3RM1NVT0R

I solved that problem by disable iptables service.
It's great.