Cisco Cisco Expressway Maintenance Manual
In such a deployment, traversal clients should be configured to use the internally-facing IP address of the
Expressway-E.
Expressway-E.
To enable the use of a static NAT:
1. Ensure that the Advanced Networking option key is installed.
2. For the externally-facing LAN port:
a. In the IPv4 address field, enter the Expressway-E's private IP address.
b. Set IPv4 static NAT mode to On.
c. In the IPv4 static NAT address field, enter the Expressway-E's public IP address - this is the IP
b. Set IPv4 static NAT mode to On.
c. In the IPv4 static NAT address field, enter the Expressway-E's public IP address - this is the IP
address of the outside of the NAT.
Note: The combination of having static NAT mode on and having the B2BUA engaged to do media
encryption/decryption can cause the firewall outside the Expressway-E to mistrust packets originating from
the Expressway-E. You can work around this by configuring the firewall to allow NAT reflection. If your
firewall cannot allow this, you must configure the traversal path such that the B2BUA on the Expressway-E
is not engaged.
encryption/decryption can cause the firewall outside the Expressway-E to mistrust packets originating from
the Expressway-E. You can work around this by configuring the firewall to allow NAT reflection. If your
firewall cannot allow this, you must configure the traversal path such that the B2BUA on the Expressway-E
is not engaged.
Configuring Ethernet settings
The
Ethernet
page (
System > Ethernet
) is used to configure the speed of the connection between the
Expressway and the Ethernet switch to which it is connected. The speed must be set to the same value on
both systems. If you have the Advanced Networking option enabled, you can configure the Ethernet speed
separately for each LAN port.
both systems. If you have the Advanced Networking option enabled, you can configure the Ethernet speed
separately for each LAN port.
The default is Auto, which means that the two systems will auto-negotiate the appropriate speed.
Note: we recommend that you use the default value of Auto unless the switch to which you are connecting is
unable to auto-negotiate. A mismatch in Ethernet speed settings between the Expressway and Ethernet
switch will at best result in packet loss; at worst it will make the system inaccessible for endpoints and
system administrators.
unable to auto-negotiate. A mismatch in Ethernet speed settings between the Expressway and Ethernet
switch will at best result in packet loss; at worst it will make the system inaccessible for endpoints and
system administrators.
Configuring DNS settings
The
DNS
page (
System > DNS
) is used to configure the Expressway's DNS servers and DNS settings.
Configuring the system host and domain name
The System host name defines the DNS host name that this Expressway is known by.
n
It must be unique for each peer in a cluster.
n
It is used to identify the Expressway on a remote log server (a default name of "TANDBERG" is used if the
System host name is not specified).
System host name is not specified).
The Domain name is used when attempting to resolve unqualified server addresses (for example
ldapserver
ldapserver
). It is appended to the unqualified server address before the query is sent to the DNS server. If
the server address is fully qualified (for example ldapserver.mydomain.com) or is in the form of an IP
address, the domain name is not appended to the server address before querying the DNS server.
address, the domain name is not appended to the server address before querying the DNS server.
It applies to the following configuration settings in the Expressway:
Cisco Expressway Administrator Guide (X8.2)
Page 24 of 378
Network and system settings
Network settings