AIX 双网卡为什么不能配置同一网段的IP, 这是一个基本网络问题吗？

caolifeng

AIX 服务器的双网卡为什么不能配置同一网段的IP, 有大虾说这是一个基本网络问题，哪位能从理论上解释得详细些？
我在windows服务器上测试过，连续ping 这两个地址，没发现什么不正常啊？
现在可以确认的是：同一块网卡，可以别名方式配置统一网段的两个IP, 可是双网卡不能配置同一网段IP的原因究竟是什么呢？
谢谢大家了！

yddll

拔掉一根网线试试

chinadns

拔了网线后，跨网段的ping会掉包，一个网段的ping应该不会掉包吧

Charlemagne

# oslevel -r
5300-03
# entstat -d ent0|grep Status
Link Status : down
# entstat -d ent1|grep Status
RJ45 Port Link Status : up
# ifconfig -a
en1: flags=4e080863,80<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,PSEG,CHAIN>
        inet 192.168.0.151 netmask 0xffffff80 broadcast 192.168.0.255
en0: flags=5e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD,PSEG,CHAIN>
        inet 192.168.0.152 netmask 0xffffff80 broadcast 192.168.0.255
lo0: flags=e08084b<UP,BROADCAST,LOOPBACK,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT>
        inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255
        inet6 ::1/0
         tcp_sendspace 131072 tcp_recvspace 131072 rfc1323 1
# ping 192.168.0.150
PING 192.168.0.150: (192.168.0.150): 56 data bytes
64 bytes from 192.168.0.150: icmp_seq=0 ttl=255 time=2 ms
64 bytes from 192.168.0.150: icmp_seq=1 ttl=255 time=1 ms
^C OK
----192.168.0.150 PING Statistics----
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 1/1/2 ms
#  ping 192.168.0.150
PING 192.168.0.150: (192.168.0.150): 56 data bytes

^C FAILED
----192.168.0.150 PING Statistics----
4 packets transmitted, 0 packets received, 100% packet loss
# ping 192.168.0.150
PING 192.168.0.150: (192.168.0.150): 56 data bytes
64 bytes from 192.168.0.150: icmp_seq=0 ttl=255 time=0 ms
64 bytes from 192.168.0.150: icmp_seq=1 ttl=255 time=0 ms
64 bytes from 192.168.0.150: icmp_seq=2 ttl=255 time=0 ms
^C OK
----192.168.0.150 PING Statistics----
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0/0/0 ms
# ping 192.168.0.150
PING 192.168.0.150: (192.168.0.150): 56 data bytes
^C FAILED
----192.168.0.150 PING Statistics----
3 packets transmitted, 0 packets received, 100% packet loss
#

caolifeng

谢谢了。
结果很清楚了！
是不是可以这样解释：双网卡的服务器平均分配向外的网络请求到每一块网卡上呢？

Charlemagne

如果都可以路由的话就会做负荷分担，fyi...
Prior to AIX 5L V5, AIX did not allow more than one interface to own a subnet route but in AIX 5L V5.1 multiple interfaces can have a route to the same subnet. This is sometimes referred to as multipath routing or route striping and when this situation exists, AIX 5L will multiplex outgoing packets destined for a particular subnet across all interfaces with a route to that subnet.

caolifeng

非常感谢！