Netopia 3300 Bedienungsanleitung PDF herunterladen (Seite 181)

Internet Key Exchange (IKE) IPsec Key Management for VPNs 6-15

• Dead Peer Detection toggles whether or not the Router will detect a remote peer being ofﬂine.

Enhanced Dead Peer Detection

Netopia Firmware Version 8.7 adds a new Dead Peer Detection mechanism.

In previous ﬁrmware versions, when Dead Peer Detection was enabled, a counter would begin in the router

when any trafﬁc was sent through the tunnel. Determination of a dead peer could take up to eight minutes.

Netopia Firmware Version 8.7 provides a new Dead Peer Detection mechanism. An IPsec IP net interface

sends ICMP ping requests to a speciﬁc IP address on a Remote Member network. The ping is periodic, and

the reply is expected within a certain amount of time. If the ICMP reply does not arrive within that time, the

peer is considered dead, the current phase 2 SAs are torn down, and the IKE SA starts a new phase 1

negotiation, followed by the normal phase 2 negotiation, thereafter.

When you toggle Dead Peer Detection to Yes (on), new options appear.

• Ping host allows you to specify the host IP address of the host to ping, and from which replies will be

expected.

This ﬁeld is only available if you have previously conﬁgured, and committed, remote network IP data in the

Add Network Conﬁguration screen under Advanced IP Proﬁle Options. See “Add Network Conﬁguration” on

page 6-17.

• Ping retry interval and Ping reply timeout options appear.

The defaults are 5 seconds and 90 seconds, respectively. You may adjust these to suit your network’s

tolerances.

Advanced IPsec Options

SA Lifetime seconds: 28800

SA Lifetime Kbytes: 0

Perfect Forward Secrecy: Yes

Dead Peer Detection: Yes

Ping host: 1.1.1.1

Ping retry interval: 5

Ping reply timeout: 90

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Netopia 3300 Bedienungsanleitung Seite 181