Whether a PC at the HQ dialing up through L2TP in a scenario where an IPSec tunnel is established between the HQ and branch can access the branch through IPSec

Huawei AR series routers can dynamically obtain IP addresses from a service provider to access public network using a 3G interface, and establish IPSec connections with the headquarters. This function applies to V200R002C00 and later versions and all models of the AR. For details, see Typical Configuration Examples.

L2TP over IPSec can be used to ensure secure communication between the branch and headquarters. This function is applicable to all versions and models of AR series routers. L2TP over IPSec can be used to ensure secure communication between the LAC and LNS. For details, see Configuration Guide-VPN.

Huawei AR routers support an IPSec tunnel through NAT traversal. For details about the configuration, see "Example for Establishing an IPSec Tunnel that Traverses NAT Devices" of "Using VPN to Implement WAN Interconnection" in Typical Configuration Examples.

There are two ways of implementing communication between branches on Huawei AR routers. 1. Branches directly communicate with each other. In this case, implementing communication between branches through configuration of IPSec and DSVPN (not supported by the AR510). For details, see "Example for configuring IPSec-based DSVPN" of "DSVPN Configuration" in Configuration Guide - VPN. 2. Branches communicate with each other through the headquarters. For details, see "Example for Configuring GRE Over IPSec to Implement Communication Between the Branches and Headquarters and NAT to Implement Communication Between Branches (Running OSPF)" of "Using VPN to Implement WAN Interconnection" in Typical Configuration Examples.

PC can be accessed through IPSec division.