Nat Configuration; Multi-Instance Of Mpls Vpn Nat Supported; Configuring Address Pool - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
rules. For the involved protocol, this is transparent. So far, V 2.41's NAT ALG
implementation supports point to point tunneling protocol (PPTP), DNS, FTP, Internet
locator service (ILS), NetBIOS over TCP/IP (NBT), session initiation protocol (SIP), and
H.323.

11.2.8 Multi-Instance of MPLS VPN NAT Supported

NAT multi-instance function offers a solution that allow not only the VPN users to
access the Internet from inner network, but also the MPLS VPN users to access the
Internet through a single gateway, as well as the users from different VPNs to use the
same private address. When an MPLS VPN user wants to access the Internet, NAT
translates the IP address and the port of the internal host into external IP address and
port and records the MPLS VPN information (such as protocol type and route identifier
RD) about the user. When the packet is sent back, NAT restores the external IP
address and port to the IP address and port of the internal host, and recognizes the
MPLS VPN user. No matter what kind of NAT it is, PAT or NO-PAT, multi-instance will be
supported.
V 2.41 NAT supports the multi-instance of internal server, and provides the outside
network with the access to the hosts within MPLS VPN. For example, the WWW server
in VPN1 uses the address of 10.110.1.1 as the inner address, on the other hand, uses
the address of 202.110.10.20 as the outer address. Using the outer address
(202.110.10.20), the Internet users can get the WWW service provided by MPLS
VPN1.

11.3 NAT Configuration

NAT configuration includes:
Configure address pool
Configure NAT
Configure Easy IP
Configure static NAT
Configure many-to-many NAT
Configure NAPT
Configure internal server
Configure NAT ALG
Configuring NAT entries for domain names
Configure NAT effective time (optional)

11.3.1 Configuring Address Pool

The address pool is a collection of some consecutive IP addresses, while internal data
packet needs to access external network via NAT, a certain address in the address pool
3Com Corporation
11-7
Chapter 11 NAT Configuration