Cấu hình chặn IP với TCP_WRAPPER

1. Tạo 2 file

vi /etc/hosts.allow

ALL:192.168.1.38 #CRM

sshd:192.168.1.235 #BINHTV_VPN

imapd : 192.168.54.0/255.255.255.0

in.ftpd: 192.168.54.0/255.255.255.0

sshd : 192.168.54.2 172.16.234.4

vsftpd: 192.168.2.*

vi /etc/hosts.deny

ALL:ALL

2. Enable chặn

---check that the service telnet is wrapped

 inetadm -l telnet | grep tcp_wrappers

--enable chan hết telnet, ssh, ftp,...: --disable hết telnet, ssh, ftp,...: 

inetadm -M tcp_wrappers=TRUE inetadm -M tcp_wrappers=FALSE

Note :

Option:

--Mở riêng từng service telnet, ssh, ftp --disable ftp, telnet, ssh

inetadm -m network/ftp:default  tcp_wrappers=TRUE inetadm -m network/ftp:default  tcp_wrappers=FALSE

inetadm -m network/telnet:default  tcp_wrappers=TRUE inetadm -m network/telnet:default  tcp_wrappers=FASLE

# vi /etc/hosts.deny

In.telnetd:all:banners /etc/banners.deny :spawn echo `date` "%h truying to connect by telnet" >> / var/log/telnet.log

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