IOS name-server configuration

[HeikkiLavaste]

Hi folks,

Quick question:

Let's say I have a Cisco router/switch configured with two DNS servers:

ip name-server x.x.x.x
ip name-server y.y.y.y

Which one is the primary? The one that was configured first?

In that case. If my primary x.x.x.x fails, server y.y.y.y will be used.

Will x.x.x.x still be queried every time first?

Br,

Heikki Lavaste

[balaji.bandi]

yes correct of x.x.x.x fails it will look for y.y.y.y for the DNS query.

you need to change the order which ever you looking to have primary and secondary or upto 6 you can add.

ip name-server server-address1 [server-address2... server-address6]

[MHM Cisco World]

I will check the failover when you use 
ip name-server <x.x.x.x> <y.y.y.y>

and 
ip name-server x.x.x.x
ip name=server y.y.y.y

I will run small lab and update you.

[MHM Cisco World]

Lab the R1 is dns server for both R2 and R3 and in 
Case 1 
in R1 config 
ip name-server 10.0.0.10 10.0.0.20

the two DNS server ip in one line, 
the ping using name is success even if I config DNS name of R2 in 10.0.0.10 and DNS name of R3 in 10.0.0.20
that meaning that R1 ask both DNS server for Name resolve 

[MHM Cisco World]

Lab the R1 is dns server for both R2 and R3 and in 
Case 2
in R1 config 
ip name-server 10.0.0.10

ip name-server 10.0.0.20

the two DNS server ip in two line, 
the ping using name is success even if I config DNS name of R2 in 10.0.0.10 and DNS name of R3 in 10.0.0.20
that meaning that R1 ask both DNS server for Name resolve