[求助]改子网掩码的问题 （新，带原文件内容）

michealzhai

我在/etc/netmasks文件里看到的子网掩码是255.255.255.224，但用ifconfig -a看到的却是FF000000,并用ifconfig将子网掩码改为255.255.255.224后，重新启动系统后子网掩码又变成FF000000,谁能告诉我怎样才能将子网掩码永久改成255.255.255.224
谢！
下面是相关文件的内容：
gmlzws04o{root} #: ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4>; mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
hme0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4>; mtu 1500 index 2
        inet 10.212.18.165 netmask ff000000 broadcast 10.212.18.191
        ether 8:0:20:88:60:49
gmlzws04o{root} #: more /etc/hosts
#
# Internet host table
#
127.0.0.1       localhost      
10.212.18.165   gmlzws04o       loghost
10.212.18.114   gmlzmas1o       mailhost
gmlzws04o{root} #: more /etc/netmasks
#
# The netmasks file associates Internet Protocol (IP) address
# masks with IP network numbers.
#
#       network-number  netmask
#
# The term network-number refers to a number obtained from the Internet Network
# Information Center.  Currently this number is restricted to being a class
# A, B, or C network number.  In the future we should be able to support
# arbitrary network numbers per the Classless Internet Domain Routing
# guidelines.
#
# Both the network-number and the netmasks are specified in
# "decimal dot" notation, e.g:
#
#               128.32.0.0 255.255.255.0
#
10.212.18.165   255.255.255.224

metor78

你的netmasks的内容可以贴出来看一下吗

openview

我的也有这个问题。
#
# The netmasks file associates Internet Protocol (IP) address
# masks with IP network numbers.
#
#       network-number  netmask
#
# The term network-number refers to a number obtained from the Internet Network
# Information Center.  Currently this number is restricted to being a class
# A, B, or C network number.  In the future we should be able to support
# arbitrary network numbers per the Classless Internet Domain Routing
# guidelines.
#
# Both the network-number and the netmasks are specified in
# "decimal dot" notation, e.g:
#
#               128.32.0.0 255.255.255.0
#
#172.25.221.0   255.255.255.0
192.168.1.0      255.255.255.240

metor78

3.36.235.0和192.168.1.0应该是从1或者网关的地址开始吧

openview

我好像明白了。
如果机器的ipadress是192.168.1.1至192.168.1.15应该写成192.168.1.1 255.255.255.240。如果是192.168.1.16至192.168.1.30就要写成192.168.1.16 255.255.255.240了。
不知道对不对。

openview

好像还是不对。
192.168.1.1至192.168.1.15应该写成192.168.1.0 255.255.255.240。
192.168.1.16至192.168.1.30应该写成192.168.1.16 255.255.255.240。
到底应该怎么写？？？我把自己稿晕了。

bear

你的:
10.212.18.165 255.255.255.224
试试这个:
10.212.18.160 255.255.255.224

michealzhai

我的工作站在局域网内，服务器就给我分配了这个IP地址，所以不能改IP地址，我只是想问一下，有什么办法可以将子网掩码永久性的改为255.255.255.224，因为我现在每次重启后都要手动改一下子网掩码才可以进入！