HTTP Basic Authentication per network

[daniel-v8]

Hi,

is it possible to configure a HTTP Basic Authentication on a per network
base? For example some users coming from an internal/private network are
not required to authenticate with HTTP Basic Authentication, users from
all other (external) networks have to authenticate? 

Thanks!
Dan

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,112027,112027#msg-112027