A Few Easy Steps: Cisco Router, Disable NAT ALG for DNS

In this session of A Few Easy Steps, we will be Disabling NAT ALG for DNS on
a Cisco Router.

Session Prerequisites:

  • You have terminal or console access to your Cisco device.

Session Assumptions:

  • You have NAT Enabled
  • You do not need ALG to re-write DNS payloads to account for NAT

Our goals of this session are:

  • Disable NAT ALG for DNS

Disable NAT ALG for DNS

conf t
no ip nat service alg tcp dns
no ip nat service alg udp dns
copy running-config startup-config


Find out more about NAT ALG for DNS here.


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