{"id":808,"date":"2013-10-01T00:00:00","date_gmt":"2013-10-01T00:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2013\/10\/01\/cisco-how-to-configure-an-ikev2-site-to-site-vpn\/"},"modified":"2021-08-01T03:42:19","modified_gmt":"2021-08-01T03:42:19","slug":"cisco-how-to-configure-an-ikev2-site-to-site-vpn","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html","title":{"rendered":"Cisco &#8211; How to configure an IKEv2 Site to Site IPSEC VPN ?"},"content":{"rendered":"<p>Within this article we will show you the steps required to build an IKEv2\u00a0IPSEC Site to Site VPN on a Cisco ASA firewall.<\/p>\n<p>IKEv2 provides a number of benefits of its predecessor IKEv1, such as ability for asymmetric authentication methods, greater protection over IKE DoS attacks, interoperability between vendors for DPD\/NAT-T, and less overhead and messages during SA establishment.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6635ef9d880c5\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6635ef9d880c5\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html\/#NAT_Exemption\" title=\"NAT Exemption\">NAT Exemption<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html\/#Encryption_Domain\" title=\"Encryption Domain\">Encryption Domain<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html\/#Phase_1_Proposal\" title=\"Phase 1 Proposal\">Phase 1 Proposal<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html\/#Phase_2_Proposal\" title=\"Phase 2 Proposal\">Phase 2 Proposal<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html\/#Tunnel_Group\" title=\"Tunnel Group\">Tunnel Group<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html\/#Crypto_Map\" title=\"Crypto Map\">Crypto Map<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html\/#Debug_Show_Commands\" title=\"Debug \/ Show Commands\">Debug \/ Show Commands<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html\/#References\" title=\"References\">References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"NAT_Exemption\"><\/span><strong>NAT Exemption<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>First of all we create our <a href=\"https:\/\/www.fir3net.com\/Cisco-ASA\/cisco-asa-83-no-nat-nat-exemption.html\">NAT exemption<\/a>. This is to ensure that traffic is not NAT`d before being sent down the tunnel.<\/p>\n<pre class=\"prettyprint&quot;\">object-group network REMOTE-ENCDOM\r\n\u00a0network-object &lt;REMOTE ENCDOM&gt; 255.255.255.0\r\nobject-group network LOCAL-ENCDOM\r\n\u00a0network-object &lt;LOCAL ENCDOM&gt; 255.255.255.0\r\n\r\n nat (inside,outside) 1 source static LOCAL-ENCDOM LOCAL-ENCDOM destination static REMOTE-ENCDOM REMOTE-ENCDOM<\/pre>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Encryption_Domain\"><\/span><strong>Encryption Domain<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Next, we define our endpoints, i.e what we want to encrypt.<\/p>\n<p><strong><em>Note :<\/em><\/strong> The previously created object groups are used to define the local and remote endpoints.<\/p>\n<pre class=\"prettyprint&quot;\">access-list ENCDOM100 extended permit ip object-group LOCAL-ENCDOM object-group REMOTE-ENCDOM<\/pre>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Phase_1_Proposal\"><\/span><strong>Phase 1 Proposal<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>We then define our Phase 1 proposals. You may of spotted that multiple ciphers are defined for each &#8220;method&#8221;. This is because IKEv2 sends across a single proposal containing multiple ciphers, compared to IKEv1 in which multiple proposals are sent.<\/p>\n<pre class=\"prettyprint&quot;\">crypto ikev2 enable outside\r\ncrypto ikev2 policy 10\r\n\u00a0encryption 3des des\r\n\u00a0integrity sha md5\r\n\u00a0group 5\r\n\u00a0prf sha\r\n\u00a0lifetime seconds 86400<\/pre>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Phase_2_Proposal\"><\/span><strong>Phase 2 Proposal<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Next, the Phase 2 proposals are configured.<\/p>\n<pre class=\"prettyprint&quot;\">crypto ipsec ikev2 ipsec-proposal IKEV2-IPSEC-ESP-AES-SHA1\r\n\u00a0protocol esp encryption aes\r\n\u00a0protocol esp integrity sha-1<\/pre>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Tunnel_Group\"><\/span><strong>Tunnel Group<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>At this point, the tunnel group is created. Just like IKEv1 the preshared key is defined. However, IKEv2 allows you to use different authentication methods for both local and remote authentication.<\/p>\n<pre class=\"prettyprint&quot;\">tunnel-group 172.16.1.1 type ipsec-l2l\r\ntunnel-group 172.16.1.1 ipsec-attributes\r\n\u00a0ikev2 remote-authentication pre-shared-key &lt;PRESHARED KEY&gt;\r\n\u00a0ikev2 local-authentication pre-shared-key &lt;PRESHARED KEY&gt;<\/pre>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Crypto_Map\"><\/span><strong>Crypto Map<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Finally the crypto map is configured. This combines the previously created encryption domain, the remote peer, and the phase 2 policy into a single crypto map. This then assigned to the outside interface.<\/p>\n<pre class=\"prettyprint&quot;\">crypto map CRYPTOMAP 100 match address ENCDOM100\r\ncrypto map CRYPTOMAP 100 set peer &lt;REMOTE PEER IP&gt;\r\ncrypto map CRYPTOMAP 100 set ikev2 ipsec-proposal IKEV2-IPSEC-ESP-AES-SHA1\r\ncrypto map CRYPTOMAP interface outside\r\ncrypto isakmp identity address<\/pre>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Debug_Show_Commands\"><\/span><strong>Debug \/ Show Commands<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Here the most command debug and show commands,<\/p>\n<ul>\n<li><strong>debug crypto ikev2 platform 5<\/strong> &#8211; debug phase 1 (ISAKMP SA`s)<\/li>\n<li><strong>debug crypto ikev2 protocol 5<\/strong> &#8211; \u00a0debug phase 1 (ISAKMP SA`s)<\/li>\n<li><strong>debug crypto ipsec<\/strong> &#8211; debug phase 2 (IPSEC SA`s)<\/li>\n<li><strong>show crypto ikev2 sa<\/strong> &#8211; show phase 1 SA`s<\/li>\n<li><strong>show crypto ipsec sa<\/strong> &#8211; show phase 2 SA`s<\/li>\n<\/ul>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"References\"><\/span><strong>References<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"http:\/\/www.cisco.com\/en\/US\/products\/ps6120\/products_tech_note09186a0080bca116.shtml\">IKEv1 to IKEv2 Migration\u00a0<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Within this article we will show you the steps required to build an IKEv2\u00a0IPSEC Site to Site VPN on a Cisco ASA firewall. IKEv2 provides a number of benefits of its predecessor IKEv1, such as ability for asymmetric authentication methods, greater protection over IKE DoS attacks, interoperability between vendors for DPD\/NAT-T, and less overhead and &#8230; <a title=\"Cisco &#8211; How to configure an IKEv2 Site to Site IPSEC VPN ?\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-how-to-configure-an-ikev2-site-to-site-vpn.html\" aria-label=\"Read more about Cisco &#8211; How to configure an IKEv2 Site to Site IPSEC VPN ?\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cisco - How to configure an IKEv2 Site to Site IPSEC VPN ? - Fir3net<\/title>\n<meta name=\"description\" content=\"Within this article we will show you the steps required to build an IKEv2\u00a0IPSEC Site to Site VPN on a Cisco ASA firewall. 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