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分类: LINUX
2018-12-07 08:52:18
限制IP
1、通过vsftpd的配置文件以及“hosts.deny”和“hosts.allow”文件设置允许某个ip地址访问
1)修改配置文件“/etc/vsftpd/vsftpd.conf”中的参数“tcp_wrapper”,确保这个参数是yes
[root@localhost wj]# gedit /etc/vsftpd/vsftpd.conf //匿名登录 tcp_wrapper=YES |
2)打开配置文件“/etc/hosts.deny“,在末尾追加一句话”vsftpd:all:Deny“
[root@localhost wj]# gedit /etc/hosts.deny # hosts.deny This file contains access rules which are used to # deny connections to network services that either use # the tcp_wrappers library or that have been # started through a tcp_wrappers-enabled xinetd. # # The rules in this file can also be set up in # /etc/hosts.allow with a 'deny' option instead. # # See 'man 5 hosts_options' and 'man 5 hosts_access' # for information on rule syntax. # See 'man tcpd' for information on tcp_wrappers # vsftpd:all:Deny //所有的ip都不可以访问 |
3)打开配置文件“/etc/hosts.allow“,在末尾追加一句话”vsftpd:192.168.0.123:Allow“。当前的配置就是只允许“192.168.0.123”访问
[root@localhost wj]# gedit /etc/hosts.allow # hosts.allow This file contains access rules which are used to # allow or deny connections to network services that # either use the tcp_wrappers library or that have been # started through a tcp_wrappers-enabled xinetd. # # See 'man 5 hosts_options' and 'man 5 hosts_access' # for information on rule syntax. # See 'man tcpd' for information on tcp_wrappers # vsftpd:192.168.0.123:Allow |
4)测试是否可以访问,当前主机的ip并不是“192.168.0.123”,因此访问不会成功的
[root@localhost wj]# service vsftpd restart //重启服务 关闭vsftpd: [确定] 为 vsftpd 启动vsftpd: [确定]
[root@localhost wj]# lftp weijie:123456@192.168.0.113:8765 //本地用户登录 lftp weijie@192.168.0.113:~> ls 中断 //ls失败,并没有连接成功 lftp weijie@192.168.0.113:~> bye
[root@localhost wj]# lftp 192.168.0.113:8765 //匿名登录 lftp 192.168.0.113:~> ls 中断 //ls失败,并没有连接成功 lftp 192.168.0.113:~> |
2、当一个ip地址对主机的连接太多时,就会降低服务器的效率。因此有必要设置一个IP的连接数,当连接超过一定的数量就不能再连了,这样就可以提高服务器的效率。Vsftpd默认没有连接设置,可以通过参数“max_clients“来设置。由于同一个局域网的ip是一样的,因此这个最大连接数要合理设置。
1)打开配置文件“/etc/vsftpd/vsftpd.conf“,在末尾追加一句话”max_clients=2“
[root@localhost pub]# gedit /etc/vsftpd/vsftpd.conf max_clients=2 |
2)重启服务,测试。一次打开三个连接,发现第三个连接不能访问
[root@localhost wj]# service vsftpd restart //重启服务 关闭vsftpd: [确定] 为 vsftpd 启动vsftpd: [确定]
[root@localhost wj]# lftp weijie:123456@192.168.0.113:8765 //登录weijie lftp weijie@192.168.0.113:~> ls -rwxrwxrwx 1 0 0 2375494044 Aug 14 07:13 1.zip lftp weijie@192.168.0.113:~>
[root@localhost wj]# lftp 192.168.0.113:8765 //匿名登录 lftp 192.168.0.113:~> ls drwxr-xr-x 2 0 0 4096 Aug 14 06:38 pub lftp 192.168.0.113:/>
[root@localhost pub]# lftp 192.168.0.113 //匿名登录 lftp 192.168.0.113:~> ls [0] ls & `ls' at 0 [重新连接前延时: 22] //不能再访问,ls失效 lftp 192.168.0.113:~> |