During phase two, IPSec SAs are established and used to encrypt IP packets sent across the tunnel. The SAs are periodically renegotiated to ensure security. Post Phase two. After IKE phase two is complete and IPSec SAs are established, information is exchanged by an IPSec tunnel.
Dec 31, 2014 · The purpose of IPsec (phase 2) is to negotiate and establish a secure tunnel for the transmission of data between VPN peers. Without a successful phase 2 negotiation, you cannot send and receive traffic across the VPN tunnel. The basic Phase 2 settings associate IPsec Phase 2 parameters with a Phase 1 configuration. When defining Phase 2 parameters, you can choose any set of Phase 1 parameters to set up a secure connection and authenticate the remote peer. For more information on Phase 2 settings in the web-based manager, see IPsec VPN in the web-based manager. Next, you must edit the VPN Phase 1 and Phase 2 settings to match the settings for the Android VPN client. In the Mobile VPN with IPSec Configuration dialog box, select the configuration you just added. Click Edit. The Edit Mobile VPN with IPSec dialog box appears. Select the IPSec Tunnel tab. From the Authentication drop-down list, select SHA2 The IPsec SA is valid for an even shorter period, meaning many IKE phase II negotiations take place. The period between each renegotiation is known as the lifetime . Generally, the shorter the lifetime, the more secure the IPsec tunnel (at the cost of more processor intensive IKE negotiations). Create the Phase 2 policy for actual data encryption. crypto ipsec transform-set myset esp-des esp-md5-hmac ! !--- Create the actual crypto map. Create the actual crypto map. Specify SRX Series,vSRX. IPsec VPN Overview, IPsec VPN Topologies on SRX Series Devices, Comparison of Policy-Based VPNs and Route-Based VPNs, Understanding IKE and IPsec Packet Processing, Understanding Phase 1 of IKE Tunnel Negotiation, Understanding Phase 2 of IKE Tunnel Negotiation, Supported IPsec and IKE Standards, Understanding Distributed VPNs in SRX Series Services Gateways , Understanding IPsec integrity algorithm (Quick Mode / Phase 2) PFS Group (Quick Mode / Phase 2) Traffic Selector (if UsePolicyBasedTrafficSelectors is used) The SA lifetimes are local specifications only, do not need to match. If GCMAES is used as for IPsec Encryption algorithm, you must select the same GCMAES algorithm and key length for IPsec Integrity
The basic Phase 2 settings associate IPsec Phase 2 parameters with a Phase 1 configuration. When defining Phase 2 parameters, you can choose any set of Phase 1 parameters to set up a secure connection and authenticate the remote peer. For more information on Phase 2 settings in the web-based manager, see IPsec VPN in the web-based manager.
Phase 2. Using the channel created in phase 1, this phase establishes IPSec security associations and negotiates information needed for the IPSec tunnel. This phase can be seen in the above figure as “IPsec-SA established.” Note that two phase 2 events are shown, this is because a separate SA is used for each subnet configured to traverse
IPsec - Wikipedia
In which IPSEC Phase is the keys used for data encryption derived. The keys are derived in IPSEC phase 2. The derived keys are used by IPSEC protocol ESP for encrypting the data. How the IPSEC do protocols, ESP and AH provides replay protection. ESP and AH include … Set Up an IPSec Tunnel - docs.paloaltonetworks.com These rules are referenced during quick mode/IKE phase 2 negotiation, and are exchanged as Proxy-IDs in the first or the second message of the process. So, if you are configuring the firewall to work with a policy-based VPN peer, for a successful phase 2 negotiation you must define the Proxy-ID so that the setting on both peers is identical. Bringing sanity to routing over IPsec — and why we do what May 01, 2015