ORACLE数据库心跳线不同，报错0821-069 ping: sendto

$ ping 192.168.100.26
PING 192.168.100.26: (192.168.100.26): 56 data bytes
0821-069 ping: sendto: There is not enough buffer space for the requested socket operation.
ping: wrote 192.168.100.26 64 chars, ret=-1
0821-069 ping: sendto: There is not enough buffer space for the requested socket operation.
ping: wrote 192.168.100.26 64 chars, ret=-1
0821-069 ping: sendto: There is not enough buffer space for the requested socket operation.
ping: wrote 192.168.100.26 64 chars, ret=-1
0821-069 ping: sendto: There is not enough buffer space for the requested socket operation.
ping: wrote 192.168.100.26 64 chars, ret=-1
0821-069 ping: sendto: There is not enough buffer space for the requested socket operation.
ping: wrote 192.168.100.26 64 chars, ret=-1
0821-069 ping: sendto: There is not enough buffer space for the requested socket operation.
ping: wrote 192.168.100.26 64 chars, ret=-1

操作系统版本是AIX6100_06_00_0000
网卡没有做绑定，在A主机（192.168.100.25）上ping 192.168.100.26报错如上，载B主机（192.168.100.26）上ping 192.168.100.25没有反应
ORACLE数据库做的RAC，2节点的。把网卡UP，DOWN也不行
AB主机的心跳是通过一个交换机连接的，ping不通时交换机和主机端的网口指示灯也不亮，重启后就亮了

重启主机恢复正常，但是不定时出现心跳线不通的情况，一直找不到原因，郁闷！