3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 11 NAT Configuration3Com Corporation11-11Table 11-8 Configure NAPTOperation CommandAdd association for access control listand address poolnat outbound acl-number[ address-group group-number ]Delete association for access control listand address poolundo nat outbound acl-number[ address-group group-number ]VI. Configuring NAT Multi-instanceEasy IP, many-to-many NAT and NAPT whatsoever all support the configuration of NATmulti-instance. And all the works to be done to support MPLS VPN is to addvpn–instance vpn-instance-name option into the rule command in ACL view to showclearly which MPLS VPN user needs translation,11.3.3 Configuring Bidirectional NATPerform the following configuration in system view.Table 11-9 Configure a bidirectional NAT entryOperation CommandConfigure a bidirectional NAT entry,mapping an overlapping address pool toa temporary address poolnat overlapaddress numberoverlappool-startaddresstemppool-startaddress { pool-lengthpool-length | address-mask mask }Remove a bidirectional NAT entry undo nat overlapaddress number11.3.4 Configuring Internal ServerBy configuring internal server, the related external address and port can be mappedinto the internal server, thus enabling the function of external network accessing theinternal server.The mapping table for internal server and external network is configured by the natserver command.The information user needs to provide includes external address, external port, internalserver address, internal server port and the protocol type of the service.If the internal server belongs to a MPLS VPN, it is necessary to specify thevpn-instance-name. Otherwise the internal server will be regarded to be in an ordinaryVPN rather than a MPLS VPN,Perform the following configuration in the interface view.
