Apr 23, 2018 · Back to the issue at hand. What you have posted above is the 3CX server's SRV query for _sip._udp.gvgw.simonics.com and it gets the correct answers back. You can get the same answers from nslookup if you query for SRV records and not only A records. The PBX also queries for _sip._tcp.gvgw.simonics.com which is for TCP SRV records and queries

Jul 20, 2020 · Symptom: DNS A record low level API query fails with 'DNS Response Is Invalid.' This happens when the site A records are larger than 512 bytes and have to be truncated. Conditions: *ISE 1.3 and higher. *A records for join-point (e.g. cisco.com) larger than 512 bytes. DNSQuery.org is a free, non-profit web site, targeting system or dns or domain administrators, to enable them make some queries via a candy web interface @davidgo I am just explaining the type of query I am issuing to the DNS and the type of query, with respect to my wireshark, is PTR (12) – RAZ_Muh_Taz Feb 20 at 18:18 A PTR for a SRV record (which is what _some-service._tcp.gv.com appears to be) isn't a common thing (I would say "never", but there might be some use case for such a thing). Dns lookup Enter one hostname (Example: google.com) and the lookup type you want to make, the tool will run a query on the dns system HostName: Type: A CNAME HINFO MX NS SOA TXT SRV ALL ANY Jul 27, 2007 · If I try to call 400@asterisk.lithnet.local, my SIP client will first perform a DNS SRV lookup. It will query its DNS server for the records: _sip._udp.asterisk.lithnet.local and _sip._tcp.asterisk.lithnet.local If I have either of them configured in my DNS, my SIP client will forward the call to the host and port number specified in the DNS Matching SRV record found at DNS server _ldap._tcp.Default-First-Site-Name._sites.gc._msdcs.xxxxxxxxx.local Warning: Record Registrations not found in some network adapters DNS SRV RRs, like all DNS RRs, have a time-to-live (TTL), after which the SRV record information is no longer valid (see ). DNS RRs SHOULD be discarded after their TTL, and after the DNS query repeated. This applies to DNS SRV RRs for AFS as it does for any other DNS RR.

A Service record (SRV record) is a specification of data in the Domain Name System defining the location, i.e., the hostname and port number, of servers for specified services. It is defined in RFC 2782 , and its type code is 33.

Is the anyway to run nslookup (Centos 5 or Windows) such that it will look up record types other than A, without having to go to interactive mode and using set type=? For example, I'd like a command The SRV record contains more information than the typical DNS record as it contains specific information that can be used to locate a specific resource at an address. This is an example of what an SRV appears like in a typical BIND-style zone file:

P/Invoke to the DnsQuery function and pass DNS_TYPE_SRV. An example can be found in this excellent post by Ruslan. I reproduce the code below in case the link breaks, but emphasize it is taken directly from his blog.

DNS is a global system for translating IP addresses to human-readable domain names. When a user tries to access a web address like “example.com”, their web browser or application performs a DNS Query against a DNS server, supplying the hostname. The DNS server takes the hostname and resolves it into a numeric IP address, which the web Usually, the Exchange external Autodiscover DNS entity is configured as a regular A or CNAME record. In some cases, a service record (SRV) is used instead. Here is a simple syntax of quickly querying for the SRV record: