I noticed in the 1.2.1 changelog that set_real_ip_from is supposed to support IPv6 addresses. Unfortunaly I get a configuration error when I try it.

This works fine:
set_real_ip_from 127.0.0.1;
real_ip_header X-Forwarded-For;

This fails:
set_real_ip_from 127.0.0.1;
set_real_ip_from ::1;
real_ip_header X-Forwarded-For;


$ nginx -t
nginx: [emerg] invalid parameter "::1" in nginx.conf:22
nginx: configuration file nginx.conf test failed