Single-interface transparent mode is similar to transparent mode, but both client-side and server-side traffic use the same interface. An external device that actively redirects the audited traffic to One Identity Safeguard for Privileged Sessions (SPS) (typically, a firewall, a router, or a layer3 switch) is required . To accomplish this, the external device must support advanced routing (also called policy-based routing or PBR). For details on configuring an external device to work with SPS in single-interface transparent mode, see Configuring external devices.
Figure 9: SPS in single-interface transparent mode
The advantages of using the single-interface transparent mode are:
Totally transparent for the clients, no need to modify their configuration.
The network topology is not changed.
Only the audited traffic is routed to SPS, production traffic is not.
The disadvantages of using the single-interface transparent mode are:
SPS acts as a man-in-the-middle regarding the connection between the client and the target server. Instead of a single client-server connection, there are two separate connections: the first between the client and SPS, and a second between SPS and the server. Depending on how you configure SPS, the source IP in the SPS-server connection can be the IP address of SPS, or the IP address of the client. In the latter case — when operating in transparent mode (including single-interface transparent mode) — SPS performs IP spoofing. Consult the security policy of your organization to see if it permits IP spoofing on your network.
Traffic must be actively routed to SPS using an external device. Consequently, a network administrator can disable SPS by changing routing rules.
When adding a new port or subnet to the list of audited connections, the configuration of the external device must be modified as well.
A network administrator can (intentionally or unintentionally) easily disable monitoring of the servers, therefore additional measures have to be applied to detect such activities.
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