ZyXEL Communications 792H manual Keep Alive, ID Type and Content

	Prestige 792H G.SHDSL Router
	Table 14-2 VPN Summary
LABEL	DESCRIPTION
IPSec Algorithm	This field displays the security protocols used for an SA.
	Both AH and ESP increase Prestige processing requirements and communications latency
	(delay).
Secure Gateway	This is the IP address of the remote IPSec router. This must be a fixed, public IP address
IP	for traffic going through the Internet.
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14.6 Keep Alive

When you initiate an IPSec tunnel with keep alive enabled, the Prestige automatically renegotiates the tunnel when the IPSec SA lifetime period expires (see section 14.10 for more on the IPSec SA lifetime). In effect, the IPSec tunnel becomes an “always on” connection after you initiate it. Both IPSec routers must have a Prestige-compatible keep alive feature enabled in order for this feature to work.

If the Prestige has its maximum number of simultaneous IPSec tunnels connected to it and they all have keep alive enabled, then no other tunnels can take a turn connecting to the Prestige because the Prestige never drops the tunnels that are already connected. Your Prestige model can support ten simultaneous IPSec SAs.

When there is outbound traffic with no inbound traffic, the Prestige automatically

drops the tunnel after two minutes.

14.7 ID Type and Content

Regardless of the ID type and content configuration, the Prestige does not allow you to save multiple active rules with overlapping local and remote IP addresses.

With aggressive negotiation mode (see section 14.10.1), the Prestige identifies incoming SAs by ID type and content since this identifying information is not encrypted. This enables the Prestige to distinguish between multiple rules for SAs that connect from remote IPSec routers that have dynamic WAN IP addresses. Telecommuters can use separate passwords to simultaneously connect to the Prestige from IPSec routers with dynamic IP addresses (see section 14.17.2 for a telecommuter configuration example).

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