Command Reference Guide

3Com Router 5000 Family and Router 6000 Family nat traversal ● 183
Command Reference
nat traversal
Purpose Use the nat traversal command to configure the NAT traversal function of
IKE/IPSec.
Use the undo nat traversal command to disable the NAT traversal function of
IKE/IPSec.
Syntax nat traversal
undo nat traversal
Parameters None
Example Configure the NAT traversal function under the IKE peer new_peer.
[Router] ike peer new_peer
[Router-ike-peer-new_peer] nat traversal
View This command can be used in the following views:
■ IKE-Peer view
Description This command fits for the application that the NAT GW functionality is included in the
VPN tunnel constructed by IKE/IPSec.
To save IP address space, ISPs often deploy NAT gateways on public networks so that
private IP addresses can be allocated to users. The likelihood thus exists that at one
end of an IPSec/IKE tunnel is a public address and at the other end is a private one. To
set up the tunnel in this case, you must configure NAT traversal at both private
network side and public network side.