??????????????

[??????]

??????????
       
??????????????????????????????????????????????????A??????????????A????????????????ping??????
 
       
??????????A??????????????????????????????ping????????????A??????????????????????????????????????????????????????ping????????????
 iptables??????????????
[root@pcs-kvm-3 cloud]# cat /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Sat Apr 12 17:52:24 2014
*nat
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT
# Completed on Sat Apr 12 17:52:24 2014
# Generated by iptables-save v1.4.7 on Sat Apr 12 17:52:24 2014
*mangle
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o virbr0 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill 
COMMIT
# Completed on Sat Apr 12 17:52:24 2014
# Generated by iptables-save v1.4.7 on Sat Apr 12 17:52:24 2014
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -i virbr0 -p udp -m udp --dport 53 -j ACCEPT 
-A INPUT -i virbr0 -p tcp -m tcp --dport 53 -j ACCEPT 
-A INPUT -p tcp -m tcp --dport 49152:49216 -j ACCEPT 
-A INPUT -i virbr0 -p udp -m udp --dport 67 -j ACCEPT 
-A INPUT -i virbr0 -p tcp -m tcp --dport 67 -j ACCEPT 
-A INPUT -p tcp -m tcp --dport 5900:6100 -j ACCEPT 
-A INPUT -p tcp -m tcp --dport 16509 -j ACCEPT 
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT 
-A FORWARD -o virbr0 -j REJECT --reject-with icmp-port-unreachable 
-A FORWARD -i virbr0 -j REJECT --reject-with icmp-port-unreachable 
COMMIT
# Completed on Sat Apr 12 17:52:24 2014
 [root@pcs-kvm-3 cloud]#