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Configuring NAT Pools for the Packet Gateway

You can configure a network address translation (NAT) pool that is exclusive to the packet gateway feature. This topic shows how to create the following types of NAT pools for PGCP:

Configuring a Remotely Controlled NAT Pool

Step-by-Step Procedure

To configure a remotely-controlled NAT pool:

  1. Create a NAT pool, and specify a name for the pool.
    [edit services]
    user@host#edit nat pool pgcp-pool
  2. Configure an address range for the pool.
    [edit services nat pool pgcp-pool]
    user@host#set address-range low 10.10.20.100 high 10.10.30.100
  3. Configure a range of ports. If you configure the NAT pool as remotely controlled, you must set a specific port range rather than using an automatic assignment of ports.
    [edit services nat pool pgcp-pool]
    user@host#set port range low 10000 high 50000
  4. Specify that the NAT pool is used exclusively by the packet gateway.
    [edit services nat pool pgcp-pool]
    user@host#set pgcp
  5. Specify that the PGC controls the addresses and ports in a NAT pool. The PGC reserves the addresses and ports when it requests specific local NAT bindings for remote addresses. (By default, the PG controls the addresses and ports in a pool.)
    [edit services nat pool pgcp-pool]
    user@host#set pgcp remotely-controlled
  6. Configure the number of ports allocated to voice and video flows on the MultiServices PIC. This value is useful when one port is allocated for Real-Time Transport Protocol (RTP), and the accompanying Real-Time Control Protocol (RTCP) flow uses the other port. By default, 2 ports are available. To support the extra ports required for combined voice and video flows, you can specify 4 ports.
    [edit services nat pool pgcp-pool]
    user@host#set pgcp ports-per-session 4

Configuring a NAT Pool Selected Based on Transport Protocol

Step-by-Step Procedure

To configure a NAT pool that can be selected based on its transport protocol:

  1. Create a NAT pool, and specify a name for the pool.
    [edit services]
    user@host#edit nat pool pgcp-pool
  2. Configure an address range for the pool.
    [edit services nat pool pgcp-pool]
    user@host#set address-range low 10.10.20.100 high 10.10.30.100
  3. Configure a range of ports. If you configure the NAT pool as remotely controlled, you must set a specific port range rather than using an automatic assignment of ports.
    [edit services nat pool pgcp-pool]
    user@host#set port range low 10000 high 50000
  4. Specify that the NAT pool is used exclusively by the packet gateway.
    [edit services nat pool pgcp-pool]
    user@host#set pgcp
  5. Specify one or more transport protocols that must match the transport protocol in the media descriptor of Add or Modify requests from the PGC.
    [edit services nat pool pgcp-pool]
    user@host#set pgcp transport [rtp-avp udp]
  6. Specify that the port is automatically assigned.
    [edit services nat pool pgcp-pool]
    user@host#set port automatic
  7. Configure the number of ports allocated to voice and video flows on the MultiServices PIC. This value is useful when one port is allocated for Real-Time Transport Protocol (RTP), and the accompanying Real-Time Control Protocol (RTCP) flow uses the other port. By default, 2 ports are available. To support the extra ports required for combined voice and video flows, you can specify 4 ports.
    [edit services nat pool pgcp-pool]
    user@host#set pgcp ports-per-session 4

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