Avaya Business Secure Router 252 Configuration - Basics Manual de usuario descargar pdf (Pagina 213)

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Chapter 13 VPN 213

Nortel Business Secure Router 252 Configuration — Basics

office rules. See the VPN Branch Office Rule Setup screen (Figure 71 on

page 222). Unlike keep alive, any time the Business Secure Router restarts, it also

automatically renegotiates any nailed up tunnels. In effect, the IPSec tunnel

becomes an “always on” connection after you initiate it. Also different from keep

alive, the peer IPSec router does not have to have a Business Secure Router

compatible nailed up feature enabled in order for this feature to work.

If the Business Secure Router has its maximum number of simultaneous IPSec

tunnels connected to it and they all have nailed up enabled, no other tunnels can

take a turn connecting to the Business Secure Router because the Business Secure

Router does not drop the tunnels that are already connected (unless there is

outbound traffic with no inbound traffic).

NAT Traversal

NAT traversal allows you to set up a VPN connection when there are NAT routers

between the Business Secure Router and the remote IPSec router.

Figure 68 NAT router between IPSec routers

Normally, you cannot set up a VPN connection with a NAT router between the

two IPSec routers because the NAT router changes the header of the IPSec packet.

In the previous figure, IPSec router A sends an IPSec packet in an attempt to

initiate a VPN. The NAT router changes the header of the IPSec packet so it does

not match the header for which IPSec router B is checking. Therefore, IPSec

router B does not respond and the VPN connection cannot be built.

Note: No matter whether or not nailed up is set, when there is outbound

traffic with no inbound traffic, the Business Secure Router automatically

drops the tunnel after two minutes.

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