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- Xref: sparky comp.protocols.tcp-ip.domains:559 comp.protocols.tcp-ip:3772
- Newsgroups: comp.protocols.tcp-ip.domains,comp.protocols.tcp-ip
- Path: sparky!uunet!usc!sdd.hp.com!ux1.cso.uiuc.edu!mp.cs.niu.edu!rickert
- From: rickert@mp.cs.niu.edu (Neil Rickert)
- Subject: Re: Intermittent "Host Unknown" problem
- Message-ID: <1992Jul21.173520.15707@mp.cs.niu.edu>
- Organization: Northern Illinois University
- References: <92203.090343IDSAK@ASUACAD.BITNET>
- Date: Tue, 21 Jul 1992 17:35:20 GMT
- Lines: 28
-
- In article <92203.090343IDSAK@ASUACAD.BITNET> Shahjehan Khatri <IDSAK@ASUACAD.BITNET> writes:
- >We're getting problems such as the following, intermittently:
- >
- >VTVM1.CC.VT.EDU unable to deliver following mail to recipient(s):
- > <USER@ospnov.vprc.asu.edu>
- >550 Host 'ospnov.vprc.asu.edu' Unknown
-
- According to NS.NIC.DDN.MIL there are two nameservers for your
- domain:
-
-
- ;; ANSWERS:
- asu.edu. 172800 NS ASUVAX.EAS.ASU.EDU.
- asu.edu. 172800 NS CCNUCB.COLORADO.EDU.
-
- Your problems are due to a gross inconsistency between the records being
- reported by CCNUCB.COLORADO.EDU and ASUVAX.EAS.ASU.EDU. Any nameserver
- attempting to resolve an address such as:
- ospnov.vprc.asu.edu
- could contact either of these servers.
-
- The inconsistency could be caused by broken software. However the most
- likely explanation is a failure to always increment the SOA serial
- number whenever there is any change in data. Your secondary server at
- CCNUCB examines the SOA serial number. If it is unchanged, it presumes
- that the data is unchanged, and does not make a new copy of your
- data.
-
-