Hi,
Thanks to Paul, Tim, and Fred for their resp to my prev request.
I am attempting to construct a secure firewall as a front end to a
private network, and am a bit overwhelmed by the amount of knowledge
required to do this properly. I'm using an IP masquerading firewall
with IPCHAINS on a 2.2.5-15 kernel (Redhat 6). I am port
forwarding all ftp, smtp, and http requests to a host on the private
network which is acting as a general server for http, smtp and ftp. I
have also set up a bunch of tcp ports
to private hosts for ICQ.
The superficial question to ask is: Do I need TCP wrappers configured
if I am using IPCHAINS. (To me it looks like ipchains serves a far
greater purpose, and tcp wrappers' capability is only a functional
subset (input packet filtering) of ipchains. - Correct me if I am
wrong).
The more detailed question is: What are the functions that handle IP
packets as they enter and leave a Linux box. Where does TCP wrappers
intercept IP packets in this scheme, and what does it do with them.
Similarly for IPCHAINS and Masq portfw.
Any pointers to where I can find this info. I am not adverse to reading
source code if necessary.
Thanks in advance.
Jonathan
Women prefer beauty to brains because men see better than they think.
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