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Full Discussion: How do you setup 2 nic cards for squid Ubuntu server?
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
Old 01-28-2013
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 CENTOS

ext_unix_group_acl

ext_unix_group_acl(8)					      System Manager's Manual					     ext_unix_group_acl(8)

NAME

       ext_unix_group_acl - Squid UNIX Group ACL helper

SYNOPSIS

       ext_unix_group_acl [-d] [-g group ] [-g group  ...] [-p] [-s]

DESCRIPTION

       ext_unix_group_acl allows Squid to base access controls on users memberships in UNIX groups.

OPTIONS

       -d     Write debug info to stderr.  -g group Specifies a group name to match.

       -p     Also match the users primary group from /etc/passwd

       -s     Strip NT domain name component from user names (/ or  separated)

CONFIGURATION

       This squid.conf example defines two Squid acls.	usergroup1 matches users in group1 , and usergroup2 matches users in group2 or group3
	      external_acl_type unix_group %LOGIN /usr/local/squid/libexec/ext_unix_group_acl -p
	      acl usergroup1 external unix_group group1
	      acl usergroup2 external unix_group group2 group3

       By  default  up to 11 groups can be matched in one acl (including commandline specified groups). This limit is defined by MAX_GROUPS in the
       source code.

KNOWN ISSUES

       Does not understand GID aliased groups sometimes used to work around groups size limitations. If you are using GID aliased groups then  you
       must specify each alias by name.

AUTHOR

       This program was written by Rodrigo Campos <rodrigo@geekbunker.org>

       This manual was written by Henrik Nordstrom <hno@squid-cache.org>

COPYRIGHT

       This program and documentation is copyright to the authors named above.

       Distributed under the GNU General Public License (GNU GPL) version 2 or later (GPLv2+).

QUESTIONS

       Questions on the usage of this program can be sent to the Squid Users mailing list <squid-users@squid-cache.org>

REPORTING BUGS

       Bug reports need to be made in English.	See http://wiki.squid-cache.org/SquidFaq/BugReporting for details of what you need to include with
       your bug report.

       Report bugs or bug fixes using http://bugs.squid-cache.org/

       Report serious security bugs to Squid Bugs <squid-bugs@squid-cache.org>

       Report ideas for new improvements to the Squid Developers mailing list <squid-dev@squid-cache.org>

       Additionally bugs or bug-fixes can be reported to Rodrigo Campos <rodrigo@geekbunker.org>

SEE ALSO

       squid(8), group(5), passwd(5), GPL(7),
       The Squid FAQ wiki http://wiki.squid-cache.org/SquidFaq
       The Squid Configuration Manual http://www.squid-cache.org/Doc/config/

								  12 August 2002					     ext_unix_group_acl(8)
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