3D Innovations 3.0.1 appendix For more information, see Understanding Fragmentation

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Appendix B Site-to-Site VPN User Interface Reference

Site to Site VPN Policies

Field Reference

Table B-18 VPN Global Settings Page > General Settings Tab

Element

Description

Fragmentation Settings

Fragmentation Mode

Supported on Cisco IOS routers and Catalyst 6500/7600 devices.

 

Fragmentation minimizes packet loss in a VPN tunnel when

 

transmitted over a physical interface that cannot support the original

 

size of the packet.

 

Select the required fragmentation mode option from the list:

 

No Fragmentation - Select if you do not want to fragment prior

 

to IPSec encapsulation. After encapsulation, the device

 

fragments packets that exceed the MTU setting before

 

transmitting them through the public interface.

 

End to End MTU Discovery - Select to use ICMP messages for

 

the discovery of MTU. Use this option when the selected

 

technology is IPSec.

 

End-to-end MTU discovery uses Internet Control Message

 

Protocol (ICMP) messages to determine the maximum MTU

 

that a host can use to send a packet through the VPN tunnel

 

without causing fragmentation.

 

Local MTU Handling - Select to set the MTU locally on the

 

devices. This option is typically used when ICMP is blocked,

 

and when the selected technology is GRE.

 

For more information, see Understanding Fragmentation,

 

page 9-72.

 

 

Local MTU Size

Supported on Cisco IOS routers and Catalyst 6500/7600 devices,

 

when Local MTU Handling is the selected fragmentation mode

 

option.

 

The MTU size can be between 540 and 1500 bytes.

 

 

 

 

User Guide for Cisco Security Manager 3.0.1

 

 

 

 

 

 

OL-8214-02

 

 

B-51

 

 

 

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Contents Site-to-Site VPN User Interface Reference Working with VPN Topologies, Understanding VPN Topologies,VPN Summary B-3 and Peers Page, page B-7B-37 Configuring IPSec Proposals, Configuring High Availability in Your VPN Topology,Configuring VRF-Aware IPSec Settings, Configuring an IKE Proposal,B-53 Understanding IPSec Technologies and Policies,Topology. See IKE Proposal Page, page B-37 See IPSec Proposal Page, page B-39See GRE Modes Page, page B-59 High Availability Page, page B-34IPSec Tab, page B-28 Managing VPN Devices in Device View, PeersTopology. See Device Selection Page, page B-10 Create VPN WizardName and Technology B-10 Device SelectionEditing a VPN Topology, Defining a Name and IPSec Technology,Navigation Path Page, page B-9 Endpoints See VPN Interface Tab, page B-17 Tab, page B-24 See Edit Endpoints Dialog Box, page B-16B-34 Edit Endpoints Dialog Box VPN Interface Tab Information, see Interface Roles Page, page C-126 Procedure for Configuring a Vpnsm or VPN SPA Blade,More information, see Interface Roles Page, page C-126 IP Address for IPSec Termination -To enter manually the IPCisco IOS Routers, More information, see Configuring Dialer Interfaces onBox, page B-32 Defining VPN Services Module Vpnsm or VPN SPA SettingsVPN SPA Blade, For more information, see Adding VPN SPA Slot Locations IP Address for IPSec Termination-To enter manually the IP Protected Networks TabTable B-9 Edit Endpoints Dialog Box Protected Networks Tab Information, see Editing Network/Host Objects, More information, see Editing Access Control List ObjectsFwsm Tab More information, see Editing Interface Role Objects,Table B-10 Edit Endpoints Dialog Box Fwsm Tab For more information, see Interface Roles Page, page C-126 VRF Aware IPSec TabTable B-11 Edit Endpoints Dialog Box VRF Aware IPSec Tab IPSec Two-Box Solution, Solution,Routers C-126Summary page. See VPN Summary Page, page B-3 Dial Backup Settings Dialog BoxTable B-12 Dial Backup Settings Dialog Box High Availability Table B-13 Create VPN wizard High Availability For more information, see Enabling Stateful Failover, Policy configured. See VPN Summary Page, page B-3IKE Proposal Site to Site VPN PoliciesSite-to-Site VPN Policies in Policy View, Understanding Preshared Key Policies,More information, see IKE Proposal Dialog Box, page C-123 IPSec Proposal IKE,C-123 For more information, see About Crypto Maps, Shared Site-to-Site VPN Policies in Policy View,For more information, see About Transform Sets, IPSec Transform Sets Page, page C-130To Use, Element Description ISAKMP/IPSec Settings Tab VPN Global SettingsFor more information, see About IKE Keepalive, Configuring VPN Global Settings,See Understanding IKE, Appendix B Site-to-Site VPN User Interface Reference VPN Global Settings Page, page B-44 Understanding NAT, NAT Settings TabNAT, For more information, see About NAT Traversal,General Settings Tab For more information, see Understanding Fragmentation Select the required setting for the DF bit Preshared Key Table B-19 Preshared Key Element Description Negotiation Method Public Key Infrastructure Working with PKI Enrollment Objects, C-140Attributes, GRE Modes FlexConfig see Working with FlexConfigs,Table B-21 GRE Modes Page GRE or GRE Dynamic IP Policy GRE?, OL-8214-02 Configuring Cisco IOS Router Interfaces, OL-8214-02 For more information, see Prerequisites for Successful Configuration of GRE,Element Description Preshared Key Policies, Interfaces, For more information, see Configuring Cisco IOS RouterEasy VPN IPSec Proposal Understanding Easy VPN, For more information, see Understanding NAT, Device Access Policies, Group Objects,More information, see Working with AAA Server Group Objects User Group Policy Working with User Group Objects,For more information, see Editing User Group Objects, Tunnel Group Policy PIX 7.0/ASA Tunnel Group Policy General Tab For more information, see Working with ASA User Groups Client Address Assignment Network/Host Objects, Tunnel Group Policy IPSec TabFor more information, see Supported AAA Server Types Tunnel Group Policy Advanced Tab More information, see Working with Interface Role Objects Tunnel Group Policy PIX 7.0/ASA Tunnel Group Policy Client VPN Software Update TabClient Connection Characteristics Table B-29 Easy VPN Remote Client Connection Characteristics Working with Site-to-Site VPN Policies, About Locking in Site-to-Site VPN Topologies,See Site to Site VPN Policies, page B-37 For more information, see About Editing a VPN TopologyFor more information, see Deleting a VPN Topology, OL-8214-02 OL-8214-02