Cisco VPN 3000 User's Guide Page 69

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3-1
VPN 3000 Concentrator Series User Guide
CHAPTER
3
Interfaces
This section of the VPN 3000 Concentrator Series Manager applies primarily to Ethernet and WAN
network interfaces. Here you configure functions that are interface-specific, rather than system-wide.
There is also a screen to configure power supply and voltage sensor alarms.
Typically, you configure at least two network interfaces for the VPN Concentrator to operate as a VPN
device: usually the Ethernet 1 (Private) interface and either the Ethernet 2 (Public) interface or a WAN
interface port. If you used Quick Configuration as described in the VPN 3000 Concentrator Series
Getting Started manual, the system supplied many default parameters for the interfaces. Here you can
configure them explicitly.
The VPN Concentrator uses filters to control data traffic through the system; see
Configuration | Policy
Management | Traffic Management
. You apply filters both to interfaces and to groups and users. Group and
user filters govern tunneled group and user data traffic; interface filters govern all data traffic.
Network interfaces usually connect to a router that routes data traffic to other networks. The VPN
Concentrator includes IP routing functions: static routes, RIP (Routing Information Protocol), and OSPF
(Open Shortest Path First). You configure RIP and interface-specific OSPF here. You configure static
routes, the default gateway, and system-wide OSPF in the IP Router section; see the
Configuration | System
| IP Routing
screens.
RIP and OSPF are routing protocols that routers use for messages to other routers, to determine network
connectivity, status, and optimum paths for sending data traffic. The VPN Concentrator supports RIP
versions 1 and 2, and OSPF version 2. You can enable both RIP and OSPF on an interface.
Filter settings override RIP and OSPF settings on an interface; therefore, be sure settings in filter rules
are consistent with RIP and OSPF use. For example, if you intend to use RIP, be sure you apply a filter
rule that forwards TCP/UDP packets with the RIP port configured.
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