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Firewall.cx :: View topic - tcp wrapper
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ice_hero
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Joined: Sep 20, 2003
Posts: 9

PostPosted: Thu Oct 09, 2003 3:33 am    Post subject: tcp wrapper Reply with quote

I read some articles about tcp wrapper. why we actually need that if we already have packet filtering firewall installed?
so what actually the main purpose of tcp wrapper?
and how about xinet.d? aren't they doing the same thing?
thanks for any guide Very Happy
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sahirh
Associate Editor & Security Advisor


Joined: Aug 14, 2003
Posts: 1699
Location: Mumbai, India.

PostPosted: Thu Oct 09, 2003 6:50 am    Post subject: Reply with quote

TCP wrappers lets you add another layer of security, after your firewall.. it provides further access control and logging. When someone tries to connect to a 'wrapped' service, it will access /etc/hosts.allow and /etc/hosts.deny to determine whether to allow the connection or not.

xinetd is a replacement for inetdacts as a 'super server' controlling connections to all services it manages. It can save system resources and provide logging facilities. It can also allow connections based on the time, as well as limit the number of connections or the load.

xinetd itself is a service wrapped by tcp wrappers. In other words xinetd makes use of tcp wrappers

I think these things are best explained with a diagram:
http://linux-rep.fnal.gov/rhl-rg-en-9/ch-tcpwrappers.html

For more on xinetd
http://www.redhat.com/docs/manuals/linux/RHL-7.3-Manual/custom-guide/s1-services-tcp-wrappers.html

That should help you out,
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Sahir Hidayatullah.
Firewall.cx Staff - Associate Editor & Security Advisor
http://tftfotw.blogspot.com
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