In response to Christopher Key <[EMAIL PROTECTED]>: > Hello, > > I've a host on the network called "GC100_000C1E00AC3F_GlobalCache", and > I'm getting interesting behaviour when I try to do DNS lookups on it. > > Under FreeBSD, ping fails with 'Unknown server error'(distinct from the > standard 'Unknown host'), and nslookup succeeds. OSX and Windows > machines will do a DNS lookup on it quite happily > > The best explanation I can manage is that ping etc. are using different > code from nslookup, and only nslookup is allowing the underscores within > the hostname. > > Is this behaviour by design? My understanding is that underscores are > not strictly permitted, but that most implementations choose to allow > them unless there's a specific reason not to.
I had this discussion with some colleagues a short time back. Our conclusion (based on some research and experimentation): 1) Underscores are not valid in domain names. 2) _most_ DNS systems will work with them anyway. 3) Just enough DNS systems don't work with _, that it's a really bad idea to use them in domain names. -- Bill Moran http://www.potentialtech.com _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
