Manual

DNS servers
The DNS server addresses are the IP addresses of up to 5 domain name servers to use when resolving
domain names. You must specify at least one default DNS server to be queried for address resolution if you
want to either:
n use FQDNs (Fully Qualified Domain Names) instead of IP addresses when specifying external addresses
(for example for LDAP and NTP servers, neighbor zones and peers)
n use features such as URI dialing or ENUM dialing
The Expressway only queries one server at a time; if that server is not available the Expressway will try
another server from the list.
In the example deployment 2 DNS servers are configured for each Expressway, which provides a level of
DNS server redundancy. The Expressway-C is configured with DNS servers which are located on the
internal network. The Expressway-E is configured with DNS servers which are publicly routable.
To configure the Default DNS server addresses:
1. Go to System > DNS.
2. Configure the DNS server Address fields as follows:
Expressway-C Expressway-E
Address 1 Enter 10.0.0.11 Enter 194.72.6.57
Address 2 Enter 10.0.0.12 Enter 194.73.82.242
3. Click Save.
Expressway-C has a Fully Qualified Domain Name of expc.internal-domain.net
Cisco Expressway Basic Configuration Deployment Guide (X8.5.2) Page 11 of 57
Expressway system configuration