Hi there, Using squid 3.2.13. Machine running squid behind local router providing IPv6 connectivity via managed tunnel. I.e, squid host know nothing about the tunnel. A handful of web sites have intermittent ipv6 connectivity issues, and I want to get dns_v4_first behavior for only those sites, based on a dstdomain acl. Something like this: Acl bad_ipv6 dstdomain .baddomain.com Dns_v4_first bad_ipv6 Presently dns_v4_first only accept on or off. Is there a way to emulate the behavior I want? -Bob