[replying to dev@ to avoid bugspam]

> --- Comment #3 from Greg Troxel<[email protected]>  ---
I checked an apache server that listens on both v4 and v6 and the config file
has

Listen 0.0.0.0:80
Listen [::]:80

So I don't follow "single bind".   (I suspect that on systems that have v6only
set to 0, listening on [::] will result in handling v4 connections as mapped
addresses.)

The documentation for apache's Listen directive is actually very helpful in explaining the situation with regard to IPv4-mapped IPv6 addresses and BSD's different default.

http://httpd.apache.org/docs/2.2/en/bind.html#ipv6

John.

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