Date: Thu, 11 Sep 1997 16:02:59 -0500 (CDT) From: Doug McLaren <dougmc@comco.com> To: greg@smokey.prismnet.com (Greg Stringfellow) Cc: freebsd-isp@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: BIND Question Message-ID: <199709112103.QAA07103@titan.comco.com> In-Reply-To: <199709112014.PAA09359@smokey.prismnet.com> from Greg Stringfellow at "Sep 11, 97 03:14:21 pm"
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Greg Stringfellow was tellin' me ... (Hi Greg!) | I've got a customer who is trying to send mail to a particular location. The | hostname is "HPISD_ADMIN.HIGHLANDPARK.K12.TX.US". I remember reading | somewhere about the underscores in a hostname not being valid. But I just | can't seem to track it down. That is indeed correct. It's probably in the relevant RFC, but I certainly can't give you a number for it ... | Now when on my 2.2 FreeBSD machines, I can nslookup that to get: ... | Non-authoritative answer: | Name: HPISD_ADMIN.HIGHLANDPARK.K12.TX.US | Address: 206.50.19.5 | | But if I try to ping it, telnet to it, or even send mail to it I get: | | bash-2.00# ping HPISD_ADMIN.HIGHLANDPARK.K12.TX.US | ping: unknown host HPISD_ADMIN.HIGHLANDPARK.K12.TX.US I get the same behavior on my FreeBSD 2.2.2 machine. Other OS's appear to be fine with it. It looks like the resolver libraries under FreeBSD 2.2.2 actually enforce the `no _' rule. Seems kind of wierd to do it there, however - typically the rule of thumb is to be permissive in what you accept, but restrictive in what you send ... Addresses without a _ in their hostname work fine - % telnet PROXY.HIGHLANDPARK.K12.TX.US Trying 206.50.19.120... telnet: Unable to connect to remote host: Connection refused % telnet HPISD_ADMIN.HIGHLANDPARK.K12.TX.US HPISD_ADMIN.HIGHLANDPARK.K12.TX.US: Unknown host My advice: mail them, tell them that _'s aren't valid in hostnames and therefore they only work sometimes, and suggest that they change the _'s to -'s. -- Doug McLaren, dougmc@comco.com Unsolicited email of a commercial or advertising nature is not welcomed. "Often, when I am reading a good book, even in the middle of the night, I stop and thank my teacher. That is, I used to, until she got an unlisted number."
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