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深蓝的blog：http://blog.csdn.net/huangyanlong/article/details/40735481
环境：Cent0S 6.4 64bit、grid 64bit
自检出现“TCP connectivity of subnet”问题。
【问题】
手工进行grid自检，报出如下错误：
[grid@xzxt1 grid]$ ./runcluvfy.sh stage -pre crsinst -n xzxt1,xzxt2 -fixup -verbose
......
......
Check: Node connectivity of subnet "192.168.56.0"
Source Destination Connected?
------------------------------ ------------------------------ ----------------
xzxt2[192.168.56.31] xzxt1[192.168.56.30] yes
Result: Node connectivity passed for subnet "192.168.56.0" with node(s) xzxt2,xzxt1
Check: TCP connectivity of subnet "192.168.56.0"
Source Destination Connected?
------------------------------ ------------------------------ ----------------
xzxt1:192.168.56.30 xzxt2:192.168.56.31 failed
ERROR:
PRVF-7617 : Node connectivity between "xzxt1 : 192.168.56.30" and "xzxt2 : 192.168.56.31" failed
Result: TCP connectivity check failed for subnet "192.168.56.0"
Check: Node connectivity of subnet "10.10.10.0"
Source Destination Connected?
------------------------------ ------------------------------ ----------------
xzxt2[10.10.10.91] xzxt1[10.10.10.90] yes
Result: Node connectivity passed for subnet "10.10.10.0" with node(s) xzxt2,xzxt1
Check: TCP connectivity of subnet "10.10.10.0"
Source Destination Connected?
------------------------------ ------------------------------ ----------------
xzxt1:10.10.10.90 xzxt2:10.10.10.91 failed
ERROR:
PRVF-7617 : Node connectivity between "xzxt1 : 10.10.10.90" and "xzxt2 : 10.10.10.91" failed
Result: TCP connectivity check failed for subnet "10.10.10.0"
Interfaces found on subnet "192.168.56.0" that are likely candidates for VIP are:
xzxt2 eth0:192.168.56.31
xzxt1 eth0:192.168.56.30
WARNING:
Could not find a suitable set of interfaces for the private interconnect
Checking subnet mask consistency...
Subnet mask consistency check passed for subnet "192.168.56.0".
Subnet mask consistency check passed for subnet "10.10.10.0".
Subnet mask consistency check passed.
Result: Node connectivity check failed
Checking multicast communication...
Checking subnet "192.168.56.0" for multicast communication with multicast group "230.0.1.0"...
PRVG-11134 : Interface "192.168.56.31" on node "xzxt2" is not able to communicate with interface "192.168.56.31" on node "xzxt2"
PRVG-11134 : Interface "192.168.56.31" on node "xzxt2" is not able to communicate with interface "192.168.56.30" on node "xzxt1"
PRVG-11134 : Interface "192.168.56.30" on node "xzxt1" is not able to communicate with interface "192.168.56.31" on node "xzxt2"
PRVG-11134 : Interface "192.168.56.30" on node "xzxt1" is not able to communicate with interface "192.168.56.30" on node "xzxt1"
Checking subnet "192.168.56.0" for multicast communication with multicast group "224.0.0.251"...
PRVG-11134 : Interface "192.168.56.31" on node "xzxt2" is not able to communicate with interface "192.168.56.31" on node "xzxt2"
PRVG-11134 : Interface "192.168.56.31" on node "xzxt2" is not able to communicate with interface "192.168.56.30" on node "xzxt1"
PRVG-11134 : Interface "192.168.56.30" on node "xzxt1" is not able to communicate with interface "192.168.56.31" on node "xzxt2"
PRVG-11134 : Interface "192.168.56.30" on node "xzxt1" is not able to communicate with interface "192.168.56.30" on