On 07/02/2017 03:37 AM, Tuomo Soini wrote:
> I tested dual stack configuration (ipv4 and ipv6) with transparent
> proxy some years ago and ended up decision:
> 
> Time of transparent proxy is long gone. Especially with dual stack
> transparent proxy makes things a lot worse. There are quite a few sites
> with ipv6 address so that web site doesn't actually work at all with
> ipv6. With transparent proxy in place browsers can't fail back to to
> ipv4 rendering all these sites unavailable.
> 
> Tom: I think this should be noted on documentation too.
> 
> Reason for the issue is browser creates tcp connection with proxy, not
> with remote site so browser doesn't know tcp connection failed with
> destination site - so ipv6 to ipv4 fallback can't work.
> 

I've added a caution to the top of the Shorewall Squid document.

-Tom
-- 
Tom Eastep        \   Q: What do you get when you cross a mobster with
Shoreline,         \     an international standard?
Washington, USA     \ A: Someone who makes you an offer you can't
http://shorewall.org \   understand
                      \_______________________________________________

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