06-24-2013
No more than without the proxy server. You may lose some identity information if the NAT assigns addresses and ports from a pool. The obvious place to put a proxy is on the firewall network boundary, that is to say, within the local no-NAT domain, so you get the identity right, and let the proxy have access, perhaps bypassing NAT/that-firewall. Of course, if you serve many such behind-NAT spaces, you need a NIC or tunnel so they can all locally connect to the proxy, or many proxy servers. If the power/resources are right, a proxy on a firewall with a local DNS server on the firewall is not a bad model -- just a different way through the same firewall. The proxy server is a very heavy DNS user, so a local DNS cache can be a nice idea. There is a wonderful feeling when you prevent a packet from needing to go out on a network!
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LEARN ABOUT DEBIAN
proxychains
proxychains(1) proxychains(1)
NAME
ProxyChains - redirect connections through proxy servers
SYNTAX
proxychains <program>
DESCRIPTION
This program forces any tcp connection made by any given tcp client to follow through proxy (or proxy chain). It is a kind of proxifier.
It acts like sockscap / premeo / eborder driver (intercepts TCP calls).
This version (2.0) supports SOCKS4, SOCKS5 and HTTP CONNECT proxy servers. Auth-types: socks - "user/pass" , http - "basic".
When to use it ?
1) When the only way to get "outside" from your LAN is through proxy server.
2) When you are behind restrictive firewall which filters outgoing connections to some ports.
3) When you want to use two (or more) proxies in chain:
like: your_host <--> proxy1 <--> proxy2 <--> target_host
4) When you want to "proxify" some programs with no proxy support built-in (like telnet).
5) When you dont want to pay for eBorder / premeo socks driver :)
Some cool features:
* This program can mix different proxy types in the same chain
like: your_host <-->socks5 <--> http <--> socks4 <--> http <--> target_host
* Different chaining options supported like: take random proxy from the list. or : chain proxies in exact order or :
chain proxies in dynamic order (smart exclude dead proxies from chain)
*You can use it with any TCP client application, even network scanners. yes, yes - you can make portscan via proxy (or chained proxies) for
example with Nmap scanner by fyodor (www.insecure.org/nmap).
proxychains nmap -sT -PO -p 80 -iR (find some webservers through proxy)
NOTE: to run suid/sgid programs(like ssh) through proxychains you have to be root
FILES
proxychains looks for config file in following order:
./proxychains.conf
$(HOME)/.proxychains/proxychains.conf
/etc/proxychains.conf
see more in /etc/proxychains.conf
EXAMPLES
To run this program the standard way type:
proxychains telnet targethost.com
in this example it will run telnet through proxy(or chained proxies) specified by proxychains.conf
COPYING
proxychains is distributed under the GNU General Public License. (GPL 2.0 or greater).
AUTHORS
Net Creature, Proxy Labs
<http://proxychains.sourceforge.net>
<Net Creature> 2.0 proxychains(1)