Question

Compare and contrast the functionalities of TCP wrappers and a firewall.

Answer 1

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Differences between Functionalities of TCP wrappers and firewall:

TCP Wrappers	Firewall
1. It works at application layer	1. It works at Internet Layer
2. It allows are deny access to a particular service that work at the application layer.	2. It allows or deny access to a particular host using tcp/ip and tcp/udp port number.
3. It is implemented in the user space of Linux .	3. It is implemented in the kernel space of Linux.
4. TCP wrappers cannot be extended to various modules	4. Firwall iptables can be extended to various different modules
5. TCP wrappers cannnot be utilised by all program or services as it is dependant on libwrap.	5.Firewall iptables can be utilised by most of the programs and services.

6. It controls the access to specific service working at application layer	6.It controls the access to specif host, port and service
7. TCP wrappers follows a selective approach for controlling access as it is application-aware i.e, it manages access of services at application layer.	7.This is not possible with a firewall as it runs at Internet layer and is not application-aware.

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