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Posts published in “VPN”

Cisco Router IKEv2 IPSec VPN Configuration

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What is Differences between IKEv1 and IKE v2? 1. Different negotiation processes − IKEv1 IKEv1 SA negotiation consists of two phases. IKEv1 phase 1 negotiation aims to establish the IKE SA. This process supports the main mode and aggressive mode. Main mode uses six ISAKMP messages to establish the IKE SA, but aggressive mode uses only three. Therefore, aggressive mode is faster in IKE SA establishment. However, aggressive mode does not provide the Peer Identity Protection. IKEv1 phase 2 negotiation…

Troubleshooting Cisco IPSec Site to Site VPN – “QM Rejected”

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There was a VPN issue to troubleshoot recently. It was between Juniper SRX and Cisco Router. It seems straightforward but it took quite a long time to troubleshoot because of communication. All steps listed here for my future reference. Some other related posts: Troubleshooting Cisco IPSec Site to Site VPN – “reason: Unknown delete reason!” after Phase 1 Completed Troubleshooting Cisco IPSec Site to Site VPN – “IPSec policy invalidated proposal with error 32” Troubleshooting Cisco IPSec Site to Site…

Renew Cisco IOS IPSec VPN Certificates from Symantec

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I am not sure if there is other better way to do it. There is no good documentation from Cisco or somewhere else regarding how you should do on renewing your ssl certificates once it is expired. Every a couple of years, I have to face this problem,  renewing all routers ssl certificates. As far as I know, you can not renew current existing certificates, you will have to created a new trustpoint , generate new CSR and import a…

Cisco IOS Router Configuration: IPSec over GRE or GRE over IPSec(1)

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IPSec over GRE means Outer Header is GRE. In other words, IPSec is riding over GRE. Please refer: Chapter: Point-to-Point GRE over IPSec Design and Implementation IPSEC over GRE Tunnel IPsec over GRE – Configuration and Explanation (CCIE Notes) The order for IPsec over GRE is IPsec first, GRE second. This order will result in these operations: 1.) Original header | Payload ! before IPsec2.) Original header | ESP | Encrypt ( Payload ) ! after IPsec in transport mode3.)…

Cisco Configuration Professional (CCP) Configure IOS SSL VPN (AnyConnect SSL VPN)

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Basic Cisco Configuration Professional (CCP) configuration has been posted before at following link: Cisco CCP Installation and Basic Configuration This Post will demonstrate how to use CCP to configure SSL VPN on an IOS Router. 1. Confirm SSL-VPN License Installed You can review another post regarding how to add Cisco license into a router. From Command Line: VPN-1#show license detailIndex: 1 Feature: NtwkEssSuitek9 Version: 1.0 License Type: EvalRightToUse License State: Active, Not in Use, EULA not accepted Evaluation total period:…

Troubleshooting Cisco IPSec Site to Site VPN – “reason: Unknown delete reason!” after Phase 1 Completed

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It is always not easy when troubleshooting a vpn issue. You will meet many situations. Here is one of examples I used to meet during configuring ipsec vpn.Other examples to troubleshoot IPSec VPN issue: Troubleshooting Cisco IPSec Site to Site VPN – “reason: Unknown delete reason!” after Phase 1 Completed Troubleshooting Cisco IPSec Site to Site VPN – “IPSec policy invalidated proposal with error 32” Topology: Symptom: When traffic initiated from remote site server 19.16.19.158 to local server 19.24.11.59, vpn…

Troubleshooting Cisco IPSec Site to Site VPN – “IPSec policy invalidated proposal with error 32”

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There was vpn set up recently using Cisco Router to connect Check Point firewall. It seems quite simple task but “IPSec policy invalidated proposal with error 32” made me go through all troubleshooting steps which shows below. Other examples to troubleshoot IPSec VPN issue: Troubleshooting Cisco IPSec Site to Site VPN – “reason: Unknown delete reason!” after Phase 1 Completed Troubleshooting Cisco IPSec Site to Site VPN – “IPSec policy invalidated proposal with error 32” Topology is quite simple: Remote…

Cisco ASA Remote Access VPN Configuration 2 – AnyConnect VPN

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Basic Cisco AnyConnect full-tunnel SSL VPN uses user authentication by username and password, provides IP address assignment to the client, and uses a basic access control policy. The client also authenticates the ASA with identity certificate-based authentication. Deployment tasks in this post are as follows: Configure the basic ASA SSL VPN gateway features. Configure local user authentication. Configure IPv4/IPv6 address assignment. Configure basic access control. Install the Cisco AnyConnect Secure Mobility Client. Initially, AnyConnect was an SSL-only VPN client. Starting…

Cisco ASA Remote Access VPN Configuration 1 – Clientless SSL VPN

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Remote access VPNs let single users connect to a central site through a secure connection over a TCP/IP network such as the Internet. Unlike other common VPN client solutions, the Clientless SSL VPN does not require that a client download and install a VPN client, all communications to the central location (where the ASA is located) are done via Secure Socket Layer (SSL) or its successor, Transport Layer Security (TLS). This post describes how to build a remote access VPN connection…

Cisco IKEv1 Site-to-Site IPSec Configuration on IOS Routers (1) – High Availability IPSec

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IPsec is a framework of open standards that provides data confidentiality, data integrity, and data authentication among participating peers. It provides these security services at the IP layer; it uses Internetwork Key Exchange (IKE) to handle negotiation of protocols and algorithms based on local policy, and to generate the encryption and authentication keys to be used by IPsec. You can use IPsec to protect one or more data flows between a pair of hosts, between a pair of security gateways,…