Linux Troubleshooting Make Easy.

Linux Learning & Troubleshooting Make Easy.

TCP Wrappers


Introduction:

In Linux TCP Wrappers software extends the abilities of inetd to provide support for every server daemon under its control . Using this method it is possible to provide logging support, return messages to connections, permit a daemon to only accept internal connections, etc. While some of these features can be provided by implementing a firewall, this will add not only an extra layer of protection but go beyond the amount of control a firewall can provide.




TCP Wrappers works on two files:
# hosts.allow
# hosts.deny

To allow a whole network for a service:

# vi hosts.allow

sshd *.mynetwork.com
or
sshd 192.168.1.0/255.255.255.192


To Deny one user from a network:

# vi hosts.allow

vsftpd:ALL EXCEPT  192.168.1.11


To allow one user in the network:

# vi hosts.deny

sshd:ALL EXCEPT 192.168.1.12


For allow or deny, we can modify this two file as per our requirement.


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