OS X 不能使用 127.0.0.2 的解决方法

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原因

FreeBSD (also OS X, and I believe NetBSD & OpenBSD) will respond to requests sent to configuredaddresses on the loopback interface, just as they would for addresses on any other interface – If you want an answer you need to assign the address first:

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mgraziano@monitor ~]$ ifconfig lo0
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
    options=3<RXCSUM,TXCSUM>
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
    inet6 ::1 prefixlen 128
    inet 127.0.0.1 netmask 0xff000000
    nd6 options=3<PERFORMNUD,ACCEPT_RTADV>

[mgraziano@monitor ~]$ ping 127.1.1.1
PING 127.1.1.1 (127.1.1.1): 56 data bytes
ping: sendto: Can't assign requested address
^C

[mgraziano@monitor ~]$ sudo ifconfig lo0 alias 127.1.1.1 netmask 0xFFFFFFFF

[mgraziano@monitor ~]$ ifconfig lo0
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
    options=3<RXCSUM,TXCSUM>
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
    inet6 ::1 prefixlen 128
    inet 127.0.0.1 netmask 0xff000000
    inet 127.1.1.1 netmask 0xffffffff
    nd6 options=3<PERFORMNUD,ACCEPT_RTADV>

[mgraziano@monitor ~]$ ping 127.1.1.1
PING 127.1.1.1 (127.1.1.1): 56 data bytes
64 bytes from 127.1.1.1: icmp_seq=0 ttl=64 time=0.020 ms
^C

解决

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$ sudo ifconfig lo0 alias 127.0.0.2 netmask 0xFFFFFFFF

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