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NFS 服务器设置：192.168.1.0/24 与 192.168.1.*

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NFS 服务器设置：192.168.1.0/24 与 192.168.1.*

我的 nfs 服务器在192.168.1.99box 上运行，并且我使用以下命令配置了 /etc/exports

/myshare 192.168.1.*(rw,sync,no_subtree_check)

我能够从192.168.1.50客户端机箱挂载 nfs。

但是我无法挂载192.168.1.49！（“mount.nfs mount(2) 权限被拒绝”，后跟“挂载时服务器拒绝 mount.nfs 访问”）

然后我发现如果我将客户端的IP改为192.168.1.48

192.168.1.0/24最后，我可以使用192.168.1.*

有人能解释一下为什么192.168.1.0/24对 有效192.168.1.49，但192.168.1.*对 无效吗？

    netmask 255.255.255.0
    network 192.168.1.0

... 我不是管理员，而且对子网的理解也不够... Ubuntu64，12.04...

答案1

请参阅的手册页exports(5)：

Machine Name Formats
NFS clients may be specified in a number of ways:

[...]

IP networks
    You  can  also  export  directories  to  all hosts on an IP (sub-) network
    simultaneously. This is done by specifying an IP address and netmask  pair
    as  address/netmask  where  the netmask can be specified in dotted-decimal
    format,  or  as  a  contiguous   mask   length.    For   example,   either
    `/255.255.252.0'  or  `/22'  appended  to  the  network  base IPv4 address
    results in identical subnetworks with 10 bits of host. [...]
    Wildcard characters generally  do  not  work on IP addresses, though they
    may work by accident when reverse DNS lookups fail.

wildcards
    Machine names may contain the wildcard characters * and ?, or may  contain
    character  class lists within [square brackets].  This can be used to make
    the exports file more compact;  for  instance,  *.cs.foo.edu  matches  all
    hosts  in  the domain cs.foo.edu.  As these characters also match the dots
    in a domain name, the given pattern will also match all hosts  within  any
    subdomain of cs.foo.edu.

这仅仅意味着你配置错误

/myshare 192.168.1.*(rw,sync,no_subtree_check)

通配符可用于主机名，为了指定 IP 网络，您需要使用点分十进制 IP 地址和可选子网大小。上面的反向 IP 查找故事可以解释为什么它适用于特定地址。

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