Cisco Cisco Expressway
■
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)
example for LDAP and NTP servers, neighbor zones and peers)
■
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.
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.
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
9
Cisco Expressway-E and Expressway-C - Basic Configuration Deployment Guide