HP MSR2000/3000/4000 Router Series Layer 3 - IP Services Command Reference

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local-address: Specifies the local IP address.
vpn-instance global-name: Specifies the MPLS L3VPN instance to which the advertised external IP
address belongs. The global-name argument is a case-sensitive string of 1 to 31 characters. To specify a
public IP address, do not use this option.
vpn-instance local-name: Specifies the MPLS L3VPN instance to which the internal server belongs. The
local-name argument is a case-sensitive string of 1 to 31 characters. To specify a public IP address, do
not use this parameter.
server-group group-number: Specifies the internal server group to which the internal server belongs.
With this parameter, the load sharing NAT Server feature is configured. The group-number argument
specifies the internal server group number in the range of 0 to 65535.
acl acl-number: Specifies an ACL number in the range of 2000 to 3999. If you specify an ACL, only
packets permitted by the ACL can be translated by using the mapping.
Usage guidelines
You can configure the NAT Server feature to allow internal servers (such as Web, FTP, Telnet, POP3, and
DNS servers) in the internal network or an MPLS VPN instance to provide services for external users.
NAT Server is usually configured on the interface that connects the external network on a NAT device. By
using the global-address and global-port arguments, external users can access the internal server at
local-address and local-port. The following table describes the address-port mappings between an
external network and an internal network for NAT Server.
Table 39 Address-port mappings for NAT Server
External network
Internal network
An external address An internal address.
An external address and an external port number An internal address and an internal port number.
An external address and N consecutive external port
numbers
An internal address and an internal port number.
N consecutive internal addresses and an internal port
number.
An internal address and N consecutive internal port
numbers.
N consecutive external addresses
An internal address.
N consecutive internal addresses.
N consecutive external addresses and an external
port number
An internal address and an internal port number.
N consecutive external addresses and an internal port
number.
An internal address and N consecutive internal port
numbers.
An external address and an external port number
An internal server group.
An external address and N consecutive external port
numbers
N consecutive external addresses and an external
port number