Cisco introduced VTI to ASA Firewalls in version 9.7.1 as an alternative to policy based crypto maps. Cisco IOS routers have long supported VTI (sVTI, DVTI, DMVPN, FlexVPN etc). This post will describe the steps on how to configure a VTI between a Cisco ASA Firewall and a Cisco IOS Router.
Cisco ASAv (v9.9.1)
Cisco CSR1000v (v16.3.3)
Continue reading “IKEv2/IPSec VTI tunnel between ASA Firewall and IOS Router”
IKEv2 is an important protocol used in IPSec VPNs, it is used to securely authenticate peers by setting up security associations (SAs). Cisco IOS routers have predefined default encryption, integrity (hashing), DH group and PRF algorithms, some of these algorithms are no longer considered secure and therefore not recommended.
As of Cisco IOS-XE v16.8.1 the default IKEv2 Proposal will be updated, more information here: https://gblogs.cisco.com/uki/deep-dive-a-vpn-journey/
As of 2018 the recommended IKEv2 Proposal ciphers are:
Integrity: SHA512 SHA384
PRF: SHA512 SHA384
DH Group: Group19 Group 14 Group21 Group5
Continue reading “Recommended IKEv2 Proposal”
In addition to Site-to-Site VPNs, FlexVPN can also be used for Remote Access VPN. It uses the same familiar commands as used to configure the S2S VPNs. Remote Access VPN can use certificate authentication (mutual certificate authentication between router and AnyConnect client), EAP (MD5/MSCHAPv2) and AnyConnect EAP. Authentication and Authorization can be performed by local AAA or external RADIUS, which can authenticate the users against Active Directory Domain and authorize depending on AD group membership.
This post will describe how to configure FlexVPN Remote Access VPN using aggregated authentication (double authentication) using AD username/password and client certificate authentication. We will not describe the basics of configuring FlexVPN Hub-and-Spoke or certificate authentication; these have been described in previous posts here:
Continue reading “FlexVPN Remote Access VPN”
This post will describe how to configure FlexVPN authorization using RADIUS AAA, ISE 2.4 will be used as the RADIUS server.
The Hub router will authenticate the spoke routers with RSA certificates. The spoke routers’ certificate will have an value in the OU (organisational unit) field which will identify the location e.g. US-Branch or UK-Branch. An IKEv2 name-mangler will be used to extract the OU value from the certificate and use this in the authorization request to the RADIUS server. Depending on matching on location in the Authorization rules the RADIUS server will return different values per location.
Continue reading “FlexVPN external AAA with RADIUS”
See the previous blog post which documents the steps to setup AnyConnect SSL-VPN and ISE integration. This blog post expands on the AnyConnect SSL-VPN configuration, adding support for IKEv2/IPSec and using double authentication (Username/Password and Certificate).
Create a Crypto Keypair
crypto key generate rsa label VPN_KEY modulus 2048
Create a CA Trustpoint
crypto ca trustpoint LAB_PKI
Continue reading “ASA AnyConnect IKEv2/IPSec VPN”
This blog post will document how to configure an AnyConnect SSL-VPN on a Cisco ASA firewall using Cisco ISE (2.1 patch 5) as a AAA server for authentication.
It is assumed that ISE is installed and configured with the basics (IP addresses and integrated into AD).
Define the ASA as a Network Device
- Navigate to Administration > Network Resources > Network Devices
- Create new by clicking Add and define the ASA
- Specify the INSIDE interface IP address of the ASA
- Tick the RADIUS Authentication Settings box
- Specify a shared secret, this will need to match on the ASA configuration
- Click Save
Continue reading “ASA AnyConnect SSL-VPN”
This blog post will document the steps to configure an IKEv2/IPSec Site-to-Site VPN between a Cisco ASA firewall (ASAv 9.9.1) and an IOS Router (v15.4) using a Pre-Shared Key (PSK).
ASA Firewall Configuration
Define IKEv2 Policy
crypto ikev2 policy 10
lifetime seconds 86400
Continue reading “IKEv2/IPSec Crypto Map between IOS Router and ASA Firewall”