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Topic: SRV Record

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	SRV record - Wikipedia, the free encyclopedia
		An SRV record or Service record is a category of data in the Internet Domain Name System specifying information on available services.
		Only another SRV record, with a priority field value higher than the primary server's record, is needed.
		SRV records are often used by Microsoft Windows 2000 clients to find the Domain Controller for a given service.
	en.wikipedia.org /wiki/SRV_record (513 words)

	easyDNS - SRV Records
		SRV, or service, records are a new addition to the list of DNS resource records which allow a great deal of flexibility and stability to services making use of them.
		SRV records are not visable in the members page by default, so to make use of them you will first have to enable them in your account.
		If 2 SRV records exist for the same service at the same priority, traffic will be directed to them in proportion to the weight.
	support.easydns.com /srvrec.php (721 words)

	SIP.edu Cookbook : DNS Configuration
		According to RFC3263 "NAPTR records provide a mapping from a domain to the SRV record for contacting a server with the specific transport protocol in the NAPTR service field." In other words NAPTR records provide a mechanism for the called domain to specify which protocols it prefers a SIP request to use.
		In this case the flag specifies that the lookup is terminal and all the information is present to find the appropriate SRV record in the regexp or target field.
		In practice BIND implementations are often smart enough to return the SRV records in the target field and the A records to which they point among the glue data so that additional DNS lookups are not required.
	mit.edu /sip/sip.edu/dns.shtml (1226 words)

	[No title]
		The resource record will contain a replacement value and an empty regular expression, which is the SRV record for that particular transport protocol.
		SRV records will potentially be used to determine the transport protocol, based on the algorithms above, but A records used for the actual lookup.
		When processing the list of SRV entries (or A records, depending on how the URI was resolved), the client MAY remove any entries for hosts which are marked as "failed" in the table.
	www.jdrosen.net /papers/draft-ietf-sip-srv-04.txt (4003 words)

	[No title]
		Applicability Statement In general, it is expected that SRV records will be used by clients for applications where the relevant protocol specification indicates that clients should use the SRV record.
		The SRV RR is unique in that the name one searches for is not this name; the example near the end shows this clearly.
		Use of the SRV record with such facilities, and in particular the interpretation of the Weight field when these facilities are used, is for further study.
	www.ietf.org /rfc/rfc2782.txt (2598 words)

	SRV (Site not responding. Last check: 2007-10-12)
		They can also be used for advanced load balancing and to specify specific ports for services - for example that a web-server is running on port 8080 instead of the usual port 80 (theoretical example - this is not yet supported by any major browsers).
		This record type is however NOT supported by most programs in use today, including web-browsers.
		To create a new SRV-record, right-click a zone in the left list in the DNS Records window, and select "Other new record" from the pop-up menu.
	www.simpledns.com /help/rec_srv.htm (223 words)

	RFC2782 (Site not responding. Last check: 2007-10-12)
		RFC 2782 DNS SRV RR February 2000 - Future protocols could be designed to use SRV RR lookups as the means by which clients locate their servers.
		RFC 2782 DNS SRV RR February 2000 In this example, a client of the "foobar" service in the "example.com." domain needs an SRV lookup of "_foobar._tcp.example.com." and possibly A lookups of "new-fast- box.example.com." and/or the other hosts named.
		RFC 2782 DNS SRV RR February 2000 Acknowledgements The algorithm used to select from the weighted SRV RRs of equal priority is adapted from one supplied by Dan Bernstein.
	rfc.net /rfc2782.html (2619 words)

	SRV Record \| Men & Mice - DNS, DHCP and IP Address Management Solutions
		An SRV record is intended to provide information on available services.
		A SRV record has four fields and a unique system for naming.
		The naming system is an underscore followed by the name of the service, followed by a period, and underscore, and then the protocol, another dot, and then the name of the domain.
	www.menandmice.com /knowledgehub/dnsglossary/srv.record (121 words)

	RFC 2915 - The Naming Authority Pointer (NAPTR) DNS Resource Record
		The record that contains the 'P' flag is the last record that is interpreted by the rules specified in this document.
		NAPTR records for this key are retrieved, those with unknown Flags or inappropriate Services are discarded and the remaining records are sorted by their Order field.
		Looking up SRV records for http.tcp.foo.com would return information on the hosts that foo.com has designated to be its mirror sites.
	members.tripod.com /rfc_archive/rfc_2915.html (5338 words)

	Chapter 8 - SRV Record
		The theory behind SRV is that given a known domain name e.g.
		SRV 0 0 389 jim ; if the service (LDAP) were hosted by another organization ; the reference could be external ; in this case the host ldap.example.net hosts the LDAP service for ; example.com _ldap._tcp.example.com.
		OpenLDAP publish an SRV RR which may be obtained by issuing an SRV query to _ldap._tcp.openldap.org.
	www.zytrax.com /books/dns/ch8/srv.html (600 words)

	Description of the DNS SRV Resource Record Type
		The SRV resource record allows administrators to use several servers for a single domain, to move services from host to host easily, and to designate some hosts as primary servers for a service and others as backups.
		When clients ask for a specific service or protocol for a specific domain (the term "domain" is used here in the strict RFC 1034 sense), they receive the names of any available servers.
		The SRV resource record is unique in that the name searched for is not this name.
	support.microsoft.com /support/kb/articles/Q232/0/25.ASP (425 words)

	Use of SRV records in conjunction with HTTP and URIs
		Abstract The combined use of SRV records for HTTP along with URIs is not as straight forward as it would appear at first glance.
		Using SRV [RFC2782] records would seem to be a natural solution to this problem in that they are protocol specific and will work where CNAMES are illegal in the DNS.
		It may be necessary to use redirection at the HTTP layer to direct these clients to the new servers if the SRV records point to a different tuple.
	thorweb.anta.net /nic/draft-andrews-http-srv-01.shtml (1087 words)

	Configure BIND DNS to Answer Active Directory Queries
		SRV records are intended to relay information via DNS regarding which server is providing which service.
		If however they are on different networks or LANs, SRV records will be required so the workstations knows where the DC is located.
		As a side effect so SRV records were never embraced and are not commonly used by *NIX admins.
	www.linuxquestions.org /linux/answers/print/606 (975 words)

	DNS on Windows 2000: Chapter 11: New DNS Features in Windows 2000
		A unique aspect of the SRV record is the format of the domain name to which it's attached.
		After a record is refreshed and its timestamp is updated, the server will not process additional refresh events (nor update the record's timestamp) for the length of the no-refresh interval.
		Static records (i.e., those added with the DNS console) are considered "permanent." They have a creation/refresh timestamp of zero and are ignored during a scavenging pass.
	www.oreilly.com /catalog/dnswin2/chapter/ch11.html (7825 words)

	Active Directory SRV Records
		SRV resource records map the name of a service to the name of a server offering that service.
		Although not a technical requirement of Active Directory, it is highly recommended that DNS servers provide support for DNS dynamic updates described in RFC 2136, Observations on the use of Components of the Class A Address Space within the Internet.
		A DNS server that supports SRV records but does not support dynamic update must be updated with the contents of the Netlogon.dns file created by the Active Directory Installation wizard while promoting a Windows 2000 Server to a domain controller.
	www.petri.co.il /active_directory_srv_records.htm (756 words)

	Create SRV records to enhance DNS flexibility in Windows 2000 Server (Site not responding. Last check: 2007-10-12)
		One example of when SRV records come in handy is when you have multiple HTTP servers.
		SRV records let you easily move a service from one host to another.
		Using SRV records, you can also designate specific hosts as the primary host for a given service and others as the secondary host.
	articles.techrepublic.com.com /5100-1035_11-5611515.html (544 words)

	OpenURLs, Citations, and Two-Level SRV-Record-Based Resolution
		If the user's institution has set up the required SRV records, and has utilized an /Default path prefix (more on which below), then the central OpenURL resolver service should take the user, via his or her local OpenURL resolver, to an OpenURL resource menu, from which point a target may be selected.
		If the user's institution has not set up the required SRV records, he or she will be shown 1) a form allowing him or her to enter a base URL manually and 2) instructions on setting up SRV record(s) that can be taken to the local network administrator and acted upon.
		Even with the potential added level of indirection introduced by delegation of _tcp SRV records to a separate server, adding a record like this to an institutions's top-level DNS zone file is a trivial operation - maybe a three-minute job for a skilled network administrator.
	www.goerwitz.com /papers/ucla (6232 words)

	Novell Documentation: GroupWise 7 - Adding MTA Resource Records to DNS
		The resource record enables the MTA’s address, along with the Internet domain names associated with it, to be broadcast throughout the Internet.
		A service ("SRV") record or a text ("TXT") record that maps the Internet domain name to the host name or IP address assigned to the MTA’s server.
		The "A" record is required if you plan to use a "SRV" record.
	www.novell.com /documentation/gw7/gw7_msadmin/data/a5m5ypf.html (701 words)

	Novell Documentation: GroupWise 6 - Adding MTA Resource Records to DNS
		The resource record enables the MTA information, along with the Internet domain names associated with it, to be broadcast throughout the Internet.
		This allows you to use the "A" record name in the service ("SRV") or text ("TXT") record rather than the IP address, which has the advantage of allowing you to only change the IP address in the "A" record rather than each "SRV" or "TXT" record.
		If two records with the same Internet domain name have the same priority, the weight number is used.
	www.novell.com /documentation/gw6/gw6_msadmin/data/a5m5ypf.html (663 words)

	Take a minute to improve the Internet!
		If the domain names are enhanced with so-called SRV records, this becomes possible: it lists multiple definitions for one name, and a supporting browser can try hosts to serve a web page until succeeded.
		Good techniques for domain-based addressing exist with the aforementioned SRV records, but they are rarely used because of the heritage of addressing computers directly.
		TODO when you choose client software: Look in the list of clients that support SRV records and complain to the manufacturer of your client if it is not listed.
	dns.vanrein.org /srv (518 words)

	RULI Synchronous SRV API
		If no SRV record is found for the specified service/domain pair, the library falls back to an usual "IN A" query performed on the domain.
		This functions provides the list of SRV records when both SRV answer code and server RCODE are successful.
		The application only needs to scan the SRV records and try to use each address in the order they appear.
	www.nongnu.org /ruli/synchronous-srv-api.html (373 words)

	Open Tech Support - netlogon error 5774 in event viewer
		From what I can gather, the most likely source of this is that the server is trying to register internal SRV records to the DNS(a seperate machine) via dynamic update and the DNS isn't set for dynamic update.
		That and from what I can tell, I don't think those SRV records are supposed to be going out to the DNS.
		If their software is so outdated that it won't support the SRV records, then they HAVE to update.
	www.opentechsupport.net /forums/archive/topic/16708-1.html (479 words)

	Voulez-Vous un Rendezvous? The Simple Guide to Apple Networking > Discovering Services (Site not responding. Last check: 2007-10-12)
		The SRV record maps the name of the service to the information needed by a client to actually use the service.
		The PTR record contains just one piece of information: the name of the service (which is the same as the name of the SRV record).
		A TXT record has the same name as the corresponding SRV record and can contain a small amount of additional information about the service instance—typically no more than 100–200 bytes at most.
	www.informit.com /articles/article.asp?p=366532 (650 words)

	Query and Update DNS
		You use the PTR record when you attempt to find the name for a particular IP address, as the example in Figure 2, page 2, shows.
		SRV records locate servers that provide a particular service for a client.
		In this example, I query for SRV records matching _ldap._tcp.dc._msdcs.xyz.com to locate the DCs in the xyz.com domain.
	www.windowsitpro.com /Article/ArticleID/26630/26630.html (1246 words)

	make-srv - Make an SRV record for tinydns (Site not responding. Last check: 2007-10-12)
		This command prints a DNS SRV record to standard output in
		flag specifies the domain name for which the SRV record is defined.
		The target must be a domain name with an associated A record.
	dqd.com /~mayoff/tools/djbdns/make-srv.html (158 words)

	Cannot Manually Add SRV Records to a Delegated Subzone
		When you attempt to manually add an SRV resource record in a delegated subzone by using the Windows 2000 DNS snap-in, an additional subdomain is created and the record is placed in the subzone of this subdomain rather than the delegated subzone.
		When you use the Windows 2000 DNS snap-in, you are only able to create SRV resource records from a server that is the authority for the entire domain, not just the delegated subzone.
		If the delegated subzone is a standard primary zone, stop the DNS Server service on the server and edit the zone file to add the SRV record.
	support.microsoft.com /default.aspx?kbid=282523 (382 words)

	[No title]
		The remainder of this section describes how SRV records may be used in a slightly different way to allow a user to discover the names of all available instances of a given type of service, in order to select the particular instance the user desires.
		In the case where no natural host name is available, the SRV record may give its own name as the name of the target host, and then the requisite address records may be attached to that same name.
		If, when it attempts to create this SRV record, it finds that a record with the same name already exists, then it knows that this name is already taken by some entity implementing at least one of the protocols from the class, and it must choose another.
	files.dns-sd.org /draft-cheshire-dnsext-dns-sd.txt (11907 words)

	[jadmin] SRV DNS-Record
		A dig get the right server, but my client (psi) can't get or >doesn't try to get a SRV record.
		Due to assignment of "jabber-client" as the service name for port 5222 through IANA I think this record would be "_jabber-client._tcp.server.tld".
		The problem is that there is no real API to get SRV records.
	mail.jabber.org /pipermail/jadmin/2002-August/006412.html (283 words)

	RULI Asynchronous SRV API
		Submit an asynchronous SRV query with parameters passed under ruli_srv_t.
		If no SRV record is found for the specified owner, the library falls back to an usual "IN A" query, as dictated by RFC2782.
		In this case, the user-provided srv_fallback_port is issued back as the target port of the "SRV records".
	www.nongnu.org /ruli/asynchronous-srv-api.html (519 words)

	ITworld.com - Doing DNS, Active Directory-style
		From a DNS perspective, SRV records are used to map a particular service and its TCP/IP port number to a particular host that offers or advertises that service.
		In addition to SRV records, support for dynamic DNS (DDNS), which allows for client self-registration of DNS records, is also required by AD in order to support dynamic registration of AD services.
		Although you could technically get by without DDNS, having to manually register AD's SRV records with DNS is enough of an inconvenience and provides enough room for error that DDNS is the only realistic solution.
	www.itworld.com /Net/ITW556/pfindex.html (1119 words)

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