Solved

Root Hint & Forwarded DNS

Posted on 2011-02-26
2
861 Views
Last Modified: 2012-05-11
Dear All,

I’m using the forwarded in our DNS servers in the environment to forward all DNS quires to our ISP, I want to ask about the root hint, do I have to remove them? What is the recommended here, using forwarded DNS or Root hint?

Thanks
0
Comment
Question by:Arabsoft_Security
2 Comments
 
LVL 39

Assisted Solution

by:Krzysztof Pytko
Krzysztof Pytko earned 250 total points
ID: 34986967
Personally, I'm using Forwarders (ISP or openDNS like Google 8.8.4.4/8.8.8.8) instead of Root Hints.

When you have disabled Root Hints you have to specify at least one IP address for Forwarders to be able to use the Internet resources. When you have Root Hints, then you don't need Forwarders.

Using Forwarders, you have to care by yourself to update them in case that they were changed/removed (mostly we place less DNS servers that Root Hints' list have :) ) and small local ISP could change IPs or bancrupt ;)

Root Hints have more TLD DNS servers and are more reliable, but you need to use thm from trusted source.

I don't know if Chris-Dent is now available, but I would rely on his opinion. He's an expert on DNS filed :)

Regards,
Krzysztof
0
 
LVL 11

Accepted Solution

by:
MichaelVH earned 250 total points
ID: 34987096
Actually, both will work just fine.

In case you don't user forwarders, your own DNS server will do the "searching". It actually goes like this (in a nutshell):

1. Client sends query to local DNS Server
2. Local server checks if it's authoritative for the domain asked for
3. If not, it will check it's local cache to see if the entry has been cached
4. If not it will contact a DNS root server (e.g. d.root-servers.net) to ask what server is authoritative for the domain
5. the root servers answers with the authoritative server for that domain (eg. server.domain.com)
6. server.domain.com will respond with a list of name servers for domain.com (eg. nameserver.domain.com)
7. local server will contact nameserver.domain.com and requests the record
8. nameserver.domain.com will answer with the record (+info)
9. local server answers to the clients's query

If you've got forwarders configured step 1-3 remain the same.

as from step 4 the forwarder is contacted and it's that server that will do the queries for you (go through step 1-9 again).

So, basically: when using forwarders you'll have some load less on your dns servers.

Grts,

Michael


0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

Scenario:  You do full backups to a internal hard drive in either product (SBS or Server 2008).  All goes well for a very long time.  One day, backups begin to fail with a message that the disk is full.  Your disk contains many, many more backups th…
I was supporting a handful of Windows 2008 (non-R2) 2 node clusters with shared quorum disks. Some had SQL 2008 installed and some were just a vendor application that we supported. For the purposes of this article it doesn’t really matter which so w…
This tutorial will walk an individual through locating and launching the BEUtility application and how to execute it on the appropriate database. Log onto the server running the Backup Exec database. In a larger environment, this would generally be …
This tutorial will show how to configure a new Backup Exec 2012 server and move an existing database to that server with the use of the BEUtility. Install Backup Exec 2012 on the new server and apply all of the latest hotfixes and service packs. The…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now