trouble with iptables, cannot ping client from server

[irwanto]

help me, i have trouble with iptables,
i'm using localbridges,
if iptables running, i only can ping 192.168.30.10 but not for 192.168.30.20
when iptables service is stop, i can ping both,,
anyone know how to fix this, i empty iptables with -F

here the command :

[root@panel ~]# iptables -F
[root@panel ~]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination
[root@panel ~]# ping 192.168.30.10
PING 192.168.30.10 (192.168.30.10) 56(84) bytes of data.
64 bytes from 192.168.30.10: icmp_seq=1 ttl=128 time=204 ms
64 bytes from 192.168.30.10: icmp_seq=2 ttl=128 time=203 ms
^C
--- 192.168.30.10 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1236ms
rtt min/avg/max/mdev = 203.663/204.174/204.686/0.682 ms
[root@panel ~]# ping 192.168.30.20
PING 192.168.30.20 (192.168.30.20) 56(84) bytes of data.
^C
--- 192.168.30.20 ping statistics ---
19 packets transmitted, 0 received, 100% packet loss, time 18344ms

[root@panel ~]# service iptables stop
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
iptables: Setting chains to policy ACCEPT: raw mangle filte[ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
[root@panel ~]# ping 192.168.30.20
PING 192.168.30.20 (192.168.30.20) 56(84) bytes of data.
64 bytes from 192.168.30.20: icmp_seq=1 ttl=128 time=206 ms
64 bytes from 192.168.30.20: icmp_seq=2 ttl=128 time=204 ms
64 bytes from 192.168.30.20: icmp_seq=3 ttl=128 time=204 ms
^C
--- 192.168.30.20 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2276ms
rtt min/avg/max/mdev = 204.308/205.206/206.721/1.138 ms
[root@panel ~]#