e07@nikhefh.nikhef.nl (Eric Wassenaar) (01/27/91)
Is it legal for a nameserver, authoritative for domain 'some.domain', to define in its zone data file a sub-sub-domain (two levels deeper) like foo.bar.some.domain NS somehost.some.domain especially when 'bar.some.domain' is not defined, i.e. there exists neither a SOA record, nor a NS record (nor any other record) for 'bar.some.domain' ? I cannot find any information about this situation in the appropriate RFCs. There exist many such cases in practice, and apparently it works, but I am not sure if that is always guaranteed. (Example: 'navo.navy.mil', 'nwc.navy.mil', etc., but no 'navy.mil') Eric Wassenaar -- Organization: NIKHEF-H, National Institute for Nuclear and High-Energy Physics Address: Kruislaan 409, P.O. Box 41882, 1009 DB Amsterdam, the Netherlands Phone: +31 20 592 0412, Home: +31 20 909449, Telefax: +31 20 592 5155 Internet: e07@nikhef.nl
gavron@alpha.sunquest.com (Ehud Gavron) (01/27/91)
In article <1131@nikhefh.nikhef.nl>, e07@nikhefh.nikhef.nl (Eric Wassenaar) writes... # #Is it legal for a nameserver, authoritative for domain 'some.domain', #to define in its zone data file a sub-sub-domain (two levels deeper) #like # foo.bar.some.domain NS somehost.some.domain Yes, but add the trailing periods: foo.bar.some.domain. ns somehost.some.domain. # #especially when 'bar.some.domain' is not defined, i.e. there exists #neither a SOA record, nor a NS record (nor any other record) for #'bar.some.domain' ? Yes. Look at the nss records. For example boulder.co.nss.nsf.net. There are no co.nss.nsf.net domains/hosts, yet the subsub of nss.nsf.net exists. #I cannot find any information about this situation in the appropriate #RFCs. RFC1035 does not prohibit this. By its definition of <domain-name> and <label> the RFC definitionally allows it. Obviously it works... #but I am not sure if that is always guaranteed. What ever is? :-) (not even the mb rr survived...) #Eric Wassenaar #-- #Internet: e07@nikhef.nl Ehud \----------------------------------------------------------------------------/ | Ehud Gavron, Systems analyst | gavron@vesta.sunquest.com (Internet) | | Sunquest Information Systems | uunet!sunquest!gavron (UUCP) | | 930 N. Finance Center Drive | gavron@arizona (BITNET) | | Tucson, Arizona, 85710 | (602)722-7546/885-7700 x.2546 (AT&Tnet) | |----------------------------------------------------------------------------| | If the ISO people are emailing each other, it's probably over TCP/IP ;-) | | - Gary Malkin | /----------------------------------------------------------------------------\