![]() There is plenty more to DNS than the above. This comes in handy for intelligent DNS load balancing in clusters and is covered in TR-4073: Secure Unified Authentication on page 27. NetApp’s clustered Data ONTAP actually allows storage admins to configure individual data LIFs as name servers to act as DNS zones in a Storage Virtual Machine. This allows for improved performance of lookups, as well as scalable DNS environments. If so, you could add a zone (such as ) and add NS records to forward requests on to the appropriate name servers running BIND. For example, might be the name of the Active Directory domain, but you might also have DNS zones in other locations that exist on other name servers. Zones are used to direct requests from clients to their appropriate locations and/or forward them to other name servers. SRV (service records such as LDAP, Kerberos KDC, etc).A/AAAA records (for IPv4/IPv6 addresses).This is one thing that trips a lot of people up, mainly because there are many different types of records. They require specific functionality, such as being able to listen for DNS requests on port 53, caching requests, acting as authoritative servers (SOA) for DNS updates, etc. They also may replicate across the network to other DNS servers. However, there are general high-level concepts that get mistaken from time to time.ĭNS servers themselves are concepts that can get lost on people. The above list is by no means complete, but gives a general idea of how integral DNS is to day to day IT shops.ĭNS is not extremely complicated. DNS has been around for a long time and is critical in numerous widely used IT services, including: However, DNS isn’t just used for Active Directory and isn’t isolated to only Windows environments. How DNS support for Active Directory worksĬonfigure a DNS server for use with Active Directory If you want to read more about that, see the following: It has to be – otherwise, AD would not function very well/at all. By default, DNS is included in Active Directory domain deployments. It’s a centralized database that contains hostnames, IP addresses, service records, aliases, zones… all sorts of things that allow enterprise IT environments leverage it for day to day operations. To cover #1, let’s talk about DNS and what it is/does.ĭNS is short for Domain Name System. The reason for that is two-fold.ġ) People do not fully understand DNS/hostname resolutionĢ) People take DNS/hostname resolution for granted □īut you would be surprised how often DNS/hostname resolution comes up in support cases, configuration issues, etc. This may all seem rudimentary to you that’s because it is. Then clients and servers can query the common database for the information and use that information to find their way around the IT village. The hostname can be served locally via a flat file, or in a database like DNS, LDAP or even NIS. The aliased short cut? That’s the hostname. A MAC address is the physical pavement of the road. This is not unlike how MAC and IP addresses work. So, in those cases, an address can be saved as a shortcut in a map app or GPS with an alias such as “Justin’s house.” No more having to give step-by-step directions!īut even giving that much information can be too much, especially if that person comes over a lot (but has a terrible memory). In today’s age, that’s as easy as telling someone a street number and name that they can plug into a GPS or Google maps. When you have people over, you need to give them information to get them to your house. That doesn’t help people find your house when you invite them over, however. Think of it this way – 127.0.0.1 is your bedroom door. However, for addresses that need to be resolvable outside of the internal subsystem, we need MAC addresses, IP addresses and in most cases, routing and DNS. Round-trip min/avg/max = 295.05/311.664/344.One of my favorite IT jokes is “there’s no place like 127.0.0.1.” You can get this slogan emblazoned on t-shirts, welcome mats, etc.ġ27.0.0.1 is, of course, localhost or the loopback address. PING localhost (127.0.0.1): 56 data bytesĢ8 packets transmitted, 0 packets received, 100% packet loss I also pinged and that works fine.ĭestination Gateway Flags Refs Use Netif Expireġ7.64.47.193 0:30:65:e1:36:ae UHLW 1 414904 en0 700 Ping usually works fine just after a reboot but after a while (during the night after a reboot) ping seems so cease functioning. Hi I have the information you requested below.
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