Editing Talk:Linux System Administration class

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we might take a look at these links for the iptables discussion:
http://www.netfilter.org/projects/iptables/
http://www.thegeekstuff.com/2011/06/iptables-rules-examples/
https://wiki.archlinux.org/index.php/Port_Knocking
.....
re ssh tunnelling - https://wiki.archlinux.org/index.php/Secure_Shell#Forwarding_other_ports
re ssh tunnelling - https://wiki.archlinux.org/index.php/Secure_Shell#Forwarding_other_ports


also see https://wiki.archlinux.org/index.php/Secure_Shell#Encrypted_SOCKS_tunnel
also see https://wiki.archlinux.org/index.php/Secure_Shell#Encrypted_SOCKS_tunnel
... don't know if this is as good as Daniel's, but there is also LLTHW's Exercise 27 and its Extra Credit links through http://nixsrv.com/llthw/ex27 . YMMV though.
.....
random tangent (cf windows more than linux) - interesting bootkit info:
http://go.eset.com/us/resources/white-papers/The_Evolution_of_TDL.pdf
There is a good addendum to Jim's net_config writeup that better explains why 10.x.x.x and 192.168.x.x networks are often used internally. It's entitled 'RFC 1597 - Address Allocation for Private Internets (RFC1597)' and its webpage is http://www.faqs.org/rfcs/rfc1597.html.
The most interesting section here is the one starting with
''The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private networks:
        10.0.0.0        -  10.255.255.255
        172.16.0.0      -  172.31.255.255
        192.168.0.0    -  192.168.255.255''
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