Colin Alston wrote:

> What we do that works very nicely is to define a subzone so we have loc 
> and cloc:loc in zones, loc policy is to drop all and cloc policy is to 
> allow all. Squid has a url_rewrite program that does 'shorewall add 
> eth0:whatever cloc' and then they can breakout.

Beware that dynamic zones, which are required by 'shorwall add', are no
longer supported by Shorewall-perl as of Shorewall 4.2.

Any new application along these lines should be built on ipsets instead.

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