How do you setup 2 nic cards for squid Ubuntu server? Post: 302762585

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Operating Systems Linux Ubuntu How do you setup 2 nic cards for squid Ubuntu server? Post 302762585 by DGPickett on Monday 28th of January 2013 05:28:30 PM

01-28-2013

Registered User

Yes, you are describing a proxying firewall. Offhand, there are three ways through a firewall: 1) connect to a proxy that connects out for you (no packets traverse the firewall, it is done at the tcp stream level). 2) NAT, iptables and similar translators where your IP and sometimes tcp/udp port are changed to different ones assigned to the firewall for this (Your internal IPs are not used past the firewall) and 3) barefoot selected packet passage (you hosts are given limited Internet exposure, need good IP addresses). Characteristically, 1 can handle less volume than 2 which is more work for the firewall than 3.

For a proxy firewall, you do not want/need to turn on IP Forwarding, which makes the 2 nic host a router. Users connect to you, and you connect for them to the Internet, but no packets flow through. The routing is inward for inward addresses, which can be free ones like 10.*.*.* and outward for the rest. It is very simple to set up. In addition to squid, there are additional proxies like tcp_relay and sockd to shoot tcp connections through the firewall for other simple tcp protocols.

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LEARN ABOUT DEBIAN

arno-fwfilter

ARNO_FWFILTER(1)														  ARNO_FWFILTER(1)

NAME

       arno-fwfilter - a filter script to make iptables firewall logs more readable for humans

SYNOPSIS

       arno-fwfilter [OPTIONS]

DESCRIPTION

       arno-fwfilter is a pipe filter script to make the firewall-log better readable. Some usage examples are:

       Static firewall log filtering:
	      arno-fwfilter < logfile

       Realtime firewall logging on tty10:
	      tail --follow <logfile> | arno-fwfilter >/dev/tty10 &

OPTIONS

       --help, -h
	      Print the available options.

       --html-output, -o
	      Use basic HTML to format the output

       --no-locations, -l
	      Disable to (try to) obtain the IP's geographical location. By default, http://www.hostip.info/ is visited to get this information.

       --no-colors, -c
	      Disable the use of colors in the output.

       --single-line, -s
	      Put all information about an event in a single line

SEE ALSO

       iptables(8), arno-iptables-firewall(8)

       The http://rocky.eld.leidenuniv.nl/ web site.

AUTHOR

       arno-fwfilter was written by Arno van Amersfoort <arnova@rocky.eld.leidenuniv.nl>.

       This manual page was written by Michael Hanke <michael.hanke@gmail.com>, for the Debian project (but may be used by others).

Michael Hanke							  September 2005						  ARNO_FWFILTER(1)