It is possible to allow all your users to use Office Mode, or to enable the feature for a specific group of users. With DNS name resolution, it is easier to access the client from within the corporate network.

The address can be specified per user, or via a DHCP server, enabling the use of a name resolution service. The address may be taken either from a general IP address pool, or from an IP address pool specified per user group. The assignment lease is renewed as long as the user is connected. The assignment takes place once the user connects and authenticates. Office Mode enables a Security Gateway to assign a remote client an IP address. The resources on the internal network of the organization may have difficulty distinguishing between the users. Both users try to access the internal network with the same IP address. Two remote users are assigned the same IP address by an ISP (for example, two users are accessing the organization from hotels which provide internal addresses and NAT them on the outbound).If there is no duplicate IP, and the packet is forwarded to some internal server, the server will then attempt to reply to a non-existent address. If there is an internal host with the same IP, the packet will probably be dropped (if Anti-Spoofing is turned on). The IP address is reverted to its original source IP of 10.0.0.1. The Security Gateway decapsulates the NATed IP and decrypts the packet. When assigned with a non-routable IP address a conflict may occur, either with similar non-routable addresses used on the corporate LAN, or with other clients which may receive the same IP address while positioned behind some other hiding NAT device.įor example, if a client user receives an IP of 10.0.0.1 which is entered into the headers of the IPSec packet.This is difficult to adjust without knowing the remote client’s IP address in advance. Router ACLs (access lists), for example, might be configured to allow only specific or internal IP addresses to access network resources. Some networking protocols or resources may require the client’s IP address to be an internal one.Because of this, several problems may arise: The client may even receive a non-routable IP which is then hidden behind a NATing device. Typically, when remote access is implemented, the client connects using an IP address locally assigned by, for example, an ISP.

Using Office Mode with Multiple External InterfacesĪs remote access to internal networks of organizations becomes widespread, it is essential that remote users are able to access as many of the internal resources of the organization as possible.

The Need for Remote Clients to be Part of the LAN

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