IPSec VPN design the definitive design and deployment guide by Vijay Bollapragada, Mohamed Khalid, Scott Wainner

By Vijay Bollapragada, Mohamed Khalid, Scott Wainner

The definitive layout and deployment consultant for safe digital inner most networks

  • Learn approximately IPSec protocols and Cisco IOS IPSec packet processing
  • Understand the diversities among IPSec tunnel mode and shipping mode
  • Evaluate the IPSec positive aspects that enhance VPN scalability and fault tolerance, resembling lifeless peer detection and keep an eye on airplane keepalives
  • Overcome the demanding situations of operating with NAT and PMTUD
  • Explore IPSec remote-access gains, together with prolonged authentication, mode-configuration, and electronic certificate
  • Examine the professionals and cons of varied IPSec connection versions reminiscent of local IPSec, GRE, and distant entry
  • Apply fault tolerance easy methods to IPSec VPN designs
  • Employ mechanisms to relieve the configuration complexity of a giant- scale IPSec VPN, together with Tunnel End-Point Discovery (TED) and Dynamic Multipoint VPNs (DMVPN)
  • Add prone to IPSec VPNs, together with voice and multicast
  • Understand how network-based VPNs function and the way to combine IPSec VPNs with MPLS VPNs

Among the various capabilities that networking applied sciences let is the power for agencies to simply and securely speak with department workplaces, cellular clients, telecommuters, and company companions. Such connectivity is now important to retaining a aggressive point of commercial productiveness. even supposing numerous applied sciences exist that may permit interconnectivity between enterprise websites, Internet-based digital deepest networks (VPNs) have advanced because the top-rated ability to hyperlink company community assets to distant staff, places of work, and cellular employees. VPNs supply productiveness improvements, effective and handy distant entry to community assets, site-to-site connectivity, a excessive point of safety, and super rate savings.


IPSec VPN Design is the 1st publication to give a close exam of the layout facets of IPSec protocols that permit safe VPN verbal exchange. Divided into 3 components, the e-book offers a great figuring out of layout and architectural problems with large-scale, safe VPN strategies. half I incorporates a finished advent to the overall structure of IPSec, together with its protocols and Cisco IOS® IPSec implementation info. half II examines IPSec VPN layout rules protecting hub-and-spoke, full-mesh, and fault-tolerant designs. This a part of the ebook additionally covers dynamic configuration types used to simplify IPSec VPN designs. half III addresses layout concerns in including prone to an IPSec VPN reminiscent of voice and multicast. This a part of the booklet additionally indicates you ways to successfully combine IPSec VPNs with MPLS VPNs.


IPSec VPN Design offers you the field-tested layout and configuration recommendation that can assist you installation an efficient and safe VPN answer in any environment.


This defense e-book is a part of the Cisco Press® Networking know-how sequence. protection titles from Cisco Press aid networking execs safe severe facts and assets, hinder and mitigate community assaults, and construct end-to-end self-defending networks.

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Extra info for IPSec VPN design the definitive design and deployment guide for secure virtual private networks

Example text

Table 3-1. DPD ISAKMP Notify Message Types Notify R-U-THERE R-U-THERE-ACK Message Value 36136 36137 Example 3-2 shows the DPD configuration on SPOKE-1-EAST. The configuration is essentially the same as the IKE keepalive configuration, except that two more timer parameters are provided to configure idle interval and retransmit interval. Example 3-2. 2 service log backtrace service timestamps debug uptime 46 47 service timestamps log uptime no service password-encryption ! hostname spoke-1-east !

The new nonce is used to generate fresh key material and may also prevent replay attacks. All the IPSec keys are derived from SKEYID_d; therefore, an attacker with knowledge of SKEYID_d will be able to derive all the current and future keys in use for IPSec until IKE renegotiates. To improve the protection of IPSec keys, Perfect Forward Secrecy (PFS) is used to decouple the relation of future keys from existing keys. When PFS is enabled, new DH public values (X,Y) will be exchanged and the resulting shared secret K will be used to generate new key material as follows: HASH(1) = hash (SKEYIDa, Mid|SAi|Ni2) without PFS HASH(1) = hash (SKEYIDa, Mid|SAi|Ni2|X|IDi|IDr) with PFS The Message ID (Mid) is important because there may be multiple Quick Mode transactions between two peers, and a unique identifier is needed to distinguish them.

Our packet matches this policy; therefore, the packet needs to be IPSec protected. If the access list does not match a packet, the packet will be sent in the clear without any further IPSec processing. 4. The following configuration shows the data sensitivity level needed if the packet needs to be secured per SPD: crypto IPSec transform-set test esp-3des esp-sha-hmac 41 42 The configuration specifies the use of 3DES encryption with ESP and SHA-HMAC for data integrity and that tunnel mode will be used for encapsulating this packet.

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