Comment 53 for bug 94940

Disabling mdns only for reverse lookups outside the local subnet(s) would not solve the problem. The test3.c example program uses a non-local, reserved address because that's a convenient way to illustrate that the problem is not caused by the local DNS configuration, but the actual delays I'm experiencing occur when connecting to an Ubuntu host from a non-Ubuntu system on a local subnet, for example with ssh, causing he Ubuntu host to do a reverse lookup of a local address. The standard DNS reverse lookup for that address resolves to NXDOMAIN in a few milliseconds, but since the connecting non-Ubuntu system is not running an mdns responder, the subsequent (pointless, IMO) mdns lookup takes several seconds to time out.