Lan Configuration - Cisco TelePresence Administrator's Manual

Network and system settings

LAN configuration

LAN 1 is the primary network port on the VCS. You can configure the IPv4 address and subnet mask, the
IPv6 address and the Maximum transmission unit (MTU) for this port.
The VCS is shipped with a default IP address of 192.168.0.100 (for both LAN ports). This lets you connect
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the VCS to your network and access it via the default address so that you can configure it remotely.
The IPv6 address, if entered, must be a static global IPv6 address. It cannot be a link-local or a stateless
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auto-configuration (SLAAC) IPv6 address.
If you have Advanced Networking installed, you can also configure these options for the LAN 2 port.
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The Maximum transmission unit (MTU) defaults to 1500 bytes.
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About Advanced Networking
The Advanced Networking option key enables the LAN 2 port on a VCS for both management and call
signaling. This allows you to have a second IP address for your VCS. The option key also enables static
NAT functionality on a VCS Expressway.
Configuring dual network interfaces
Dual network interfaces are intended for deployments where the VCS Expressway is located in a DMZ
between two separate firewalls on separate network segments. In such deployments, routers prevent
devices on the internal network from being able to route IP traffic to the public internet, and instead the traffic
must pass through an application proxy such as the VCS Expressway.
To enable the use of dual network interfaces:
1. Ensure that the Advanced Networking option key is installed on the VCS Expressway.
2. Set Use dual network interfaces to Yes.
3. Set External LAN interface to LAN2.
LAN 2 should be used as the public interface of the VCS Expressway (if the VCS Expressway is ever
clustered, LAN 1 must be used for clustering, and the clustering interface must not be mapped through a
NAT).
This setting also determines the port from which TURN server relay allocations are made.
Note that:
You should configure the LAN 1 port and restart the VCS before configuring the LAN 2 port.
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The LAN 1 and LAN 2 interfaces must be on different, non-overlapping subnets.
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If you have Advanced Networking enabled but only want to configure one of the Ethernet ports, you must
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use LAN 1.
If the VCS Expressway is in the DMZ, the outside IP address of the VCS Expressway must be a public IP
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address, or if static NAT mode is enabled, the static NAT address must be publicly accessible.
The VCS Expressway may also be used to traverse internal firewalls within an enterprise. In this case the
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"public" IP address may not be publicly accessible, but is an IP address accessible to other parts of the
enterprise.
Cisco VCS Administrator Guide (X8.1.1)
Network settings
Page 30 of 507