Cisco Cisco Expressway
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:
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)
(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.
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.
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