Wireless Access

Occasional Contributor I

Controllers as DNS servers

I noticed that our controllers (both master and locals) function as DNS servers.  Is there any reason they do this by default?  I'd like to turn it off, but I hear doing so requires a reboot of each controller, so I'm planning on putting an ACL on their inbound interfaces to block DNS.  Just wanted to post and make sure there isn't some functionality I'm destroying by blocking udp 53.  Thanks!

Retired Employee

Re: Controllers as DNS servers

Does your DHCP server provide the IP address of the controller as the DNS server? 


Client would not send DNS queries to the controller unless they are configured to do so.


Are your controllers acting as DHCP servers? If yes, then what IP address are configured under "dns-servers"? Also, please post the  output of command 


show ip dhcp database 






Re: Controllers as DNS servers

hi all,

can aruba controller act as DNS serveur or not ?!


ICT Network & Security Engineer

[If my post is helpful please give kudos, or mark as solved if it answers your post.]
Guru Elite

Re: Controllers as DNS servers

Yes, if you have ip domain-lookup configured on the controller, and if you have a dns server defined on it, as well. (ip name-server x.x.x.x)

*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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