DNS Configuration for LC

Hello,

 

 

With LC , you have to delegate the name resolution for each host in your zone mydomain.com.

 

 

Imagine you have 2 ISP and so 2 ranges 10.10.10.0 /24 and 20.20.20.0/24

 

 

In the DNS

 

 

lc1.mydomain.com A 10.10.10.254 --> IP of your Big-ip in ISP 1 range

 

lc2.mydomain.com A 20.20.20.254 --> IP of your Big-ip in ISP 2 range

 

 

For each WideIp you have in your config (eg www)

 

 

; Delegated sub-zone www.mydomain.com

 

 

www NS lc1.mydomain.com

 

www NS lc2.mydomain.com

 

 

; End delegation

 

 

Hope this help you.

 

 

Regards,

 

 

Fred.

 

Hi Fredr,

 

Thanks for your reply I have done the following. will you pls help me in the below

 

 

Correct me where m i wrong...

 

 

 

wip.ab.edu.xx NS lc1.ab.edu.xx

 

wip.ab.edu.xx NS lc2.ab.edu.xx

 

 

 

lc1.ab.edu.xx A 10.10.10.254

 

lc2.ab.edu.xx A 20.20.20.254

 

 

service.ab.edu.xx CNAME service.wip.ab.edu.xx

 

 

and so on for all other services... is this correct floww.... ?????

 

Hi ,

 

 

One thing i don't understand in your example, where is service.wip.ab.edu.xx ?

 

 

I think with GTM, you can manage a DNS Zone (like wip.ab.edu.xx) but not with LC.

 

In my mind GTM = SOA , LC = NS.

 

 

In my deployment i will have :

 

 

In the DNS zone ab.edu.xx

 

 

service.ab.edu.xx NS lc1.ab.edu.xx

 

service.ab.edu.xx NS lc2.ab.edu.xx

 

 

In the LC (Inbound Wide IP menu)

 

 

service.ab.edu.xx with members .

 

 

Regards,

 

 

Fred

 

Hi Fred,

 

I have created wide IP in the LC wide ip list as "service.wip.ab.edu.xx" and currently in the DNS zone file the entries is like "service.ab.edu.xx" so the DNS enteries i have have planned to changed as i showed in the above post is correct or not?????

 

 

CURRENT ENTERY IS LIKE THIS TELL ME WHAT SHALL I CHANGE... now when the LC is coming into picture

 

 

 

ab.edu.xx NS ns1.ab.edu.xx

 

ab.edu.xx NS ns2.ab.edu.xx

 

 

ns1.ab.edu.xx A 1.1.1.1 <------ DNS server 1

 

ns2.ab.edu.xx A 2.2.2.2 <------ DNS server 2

 

 

 

service1.ab.edu.xx A 1.1.1.2

 

 

 

AS PER MY UNDERSTANDING THE cahnges in the above entry should have happened like this

 

 

service1.ab.edu.xx CNAME service1.wip.ab.edu.xx

 

 

wip.ab.edu.xx NS lc1.ab.edu.xx

 

wip.ab.edu.xx NS lc2.ab.edu.xx

 

 

 

lc1.ab.edu.xx A X.X.X.X

 

lc2.ab.edu.xx A Y.Y.Y.Y

 

 

 

Where m i going wrong.

 

 

Hi,

 

 

Could you try :

 

 

lc1.ab.edu.xx A X.X.X.X

 

lc2.ab.edu.xx A Y.Y.Y.Y

 

 

service1.wip.ab.edu.xx NS lc1.ab.edu.xx

 

service1.wip.ab.edu.xx NS lc2.ab.edu.xx

 

 

service1.ab.edu.xx CNAME service1.wip.ab.edu.xx

 

 

As per my understanding wip.ab.edu.xx is a DNS Zone , you can only delegate host name resolution to the LC not Zone.

 

 

Regards,

 

 

Fred

I will check it out shortly it sounds logical and should work.... some of the enteries in the existing DNS is binded to the same ip and should be entered as an Alias of a particular entry like...

 

 

IN THE CURRENT SETUP

 

 

www.ab.edu.xx A 32.32.32.32

 

service3.ab.edu.xx A 32.32.32.32

 

service4.ab.edu.xx A 32.32.32.32.

 

and so on....

 

 

so what shall i do with such records in GTM there is an option of Alias but not in LC so what should be done in this case.... ????

I think 2 options :

 

 

one delegation in DNS and one wide ip in LC

 

www.ab.edu.xx NS lc1.ab.edu.xx

 

www.ab.edu.xx NS lc2.ab.edu.xx

 

with N CNAME in the DNS for service3 , service4 ...

 

 

OR

 

 

N delegations in DNS and N wide ip in LC

 

 

I never did such configuration in my own deployment.

 

 

Regards,

 

 

Fred

Hi Fred it got a little bit mixed up i will write here what i have understood from your reply.

 

 

www.ab.edu.xx CNAME www.wip.ab.edu.xx

 

service2.ab.edu.xx CNAME service2.wip.ab.edu.xx

 

service3.ab.edu.xx CNAME service3.wip.ab.edu.xx

 

 

www.wip.ab.edu.xx NS lc1.ab.edu.xx

 

www.wip.ab.edu.xx NS lc2.ab.edu.xx

 

 

service2.wip.ab.edu.xx NS lc1.ab.edu.xx

 

service2.wip.ab.edu.xx NS lc2.ab.edu.xx

 

 

service3.wip.ab.edu.xx NS lc1.ab.edu.xx

 

service3.wip.ab.edu.xx NS lc2.ab.edu.xx

 

 

AND ON THE LC I CREATED ALL THE INDIVIDUAL WIDE-IP ENTRIES

 

www.wip.ab.edu.xx

 

service2.wip.ab.edu.xx

 

service3.wip.ab.edu.xx

 

and so on.....

 

 

well this really looks like so many entries in the DNS zone file if i have to change all the entries.... is there no way where it looks more organized rather than all individual entries looking more dispersed....

Yes, that s what i want to explain in the option 2.

 

 

The option 1 could be

 

 

www.ab.edu.xx CNAME www.wip.ab.edu.xx

 

service2.ab.edu.xx CNAME www.ab.edu.xx

 

service3.ab.edu.xx CNAME www.ab.edu.xx

 

 

www.wip.ab.edu.xx NS lc1.ab.edu.xx

 

www.wip.ab.edu.xx NS lc2.ab.edu.xx

 

 

And on the LC , only one individual WideIp entry

 

www.wip.ab.edu.xx

 

and nothing else

 

 

Don't know which solution wouldl be better than the other.

What about the reverse lookup zone do I have to make any changes there or no need the reverse lookup zone entry will remain the same on the current DNS server.????