{"id":705,"date":"2012-09-01T00:00:00","date_gmt":"2012-09-01T00:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2012\/09\/01\/cisco-asa-to-netscreen-vpn-policy-vpn\/"},"modified":"2023-02-24T12:58:39","modified_gmt":"2023-02-24T12:58:39","slug":"cisco-asa-to-netscreen-vpn-policy-vpn","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html","title":{"rendered":"Cisco ASA &#038; Juniper Netscreen VPN Overlapping Encryption Domains"},"content":{"rendered":"<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-662e38e77651f\" 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-662e38e77651f\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Purpose\" title=\"Purpose\">Purpose<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Example\" title=\"Example\">Example<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Topology\" title=\"Topology\">Topology<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Netscreen\" title=\"Netscreen\">Netscreen<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Configure_Tunnel_Interface\" title=\"Configure Tunnel Interface\">Configure Tunnel Interface<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Configure_Routes\" title=\"Configure Routes\">Configure Routes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Address_Books\" title=\"Address Books\">Address Books<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Configure_VPN\" title=\"Configure VPN\">Configure VPN<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Configure_Policy\" title=\"Configure Policy\u00a0\">Configure Policy\u00a0<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Cisco_ASA\" title=\"Cisco ASA\">Cisco ASA<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Configure_NAT\" title=\"Configure NAT\">Configure NAT<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Configure_VPN-2\" title=\"Configure VPN\">Configure VPN<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\/#Configure_Policy-2\" title=\"Configure Policy\">Configure Policy<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"Purpose\"><\/span><strong>Purpose<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The purpose of this article is to describe the various steps required to create a site to site VPN between a Cisco ASA and a Juniper Netscreen when both sides have overlapping subnets.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Example\"><\/span><strong>Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Within this example each side will have an endpoint of 192.168.10.0\/24. Because of this both sides will present their endpoint as a different subnet via the use of NAT. These subnets will be :<\/p>\n<table style=\"border: 0pt solid black; border-collapse: collapse;\" border=\"0\">\n<tbody>\n<tr style=\"background-color: #808080;\">\n<td style=\"width: 370px; border: 1px solid #000000;\"><\/td>\n<td style=\"width: 370px; text-align: center; border: 1px solid #000000;\"><span style=\"color: #ffffff;\"><strong>REAL<\/strong><\/span><\/td>\n<td style=\"width: 370px; text-align: center; border: 1px solid #000000;\"><span style=\"color: #ffffff;\"><strong>NAT<\/strong><\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 370px; border: 1px solid #000000;\">Local Endpoint<\/td>\n<td style=\"width: 370px; border: 1px solid #000000;\">192.168.10.0\/24<\/td>\n<td style=\"width: 370px; border: 1px solid #000000;\">172.16.1.0\/24<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 370px; border: 1px solid #000000;\">Remote Endpoint<\/td>\n<td style=\"width: 370px; border: 1px solid #000000;\">192.168.10.0\/24<\/td>\n<td style=\"width: 370px; border: 1px solid #000000;\">172.16.2.0\/24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>In terms of the Peer IP`s for each side, these are :<\/p>\n<table style=\"border-collapse: collapse; border: 0pt solid black;\" border=\"0\">\n<tbody>\n<tr style=\"background-color: #808080;\">\n<td style=\"width: 370px; text-align: center; border: 1px solid #000000;\"><\/td>\n<td style=\"width: 370px; text-align: center; border: 1px solid #000000;\"><strong><span style=\"color: #ffffff;\">VENDOR<\/span><\/strong><\/td>\n<td style=\"width: 370px; text-align: center; border: 1px solid #000000;\"><strong><span style=\"color: #ffffff;\">PEER<\/span><\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 370px; border: 1px solid #000000;\">Local Peer<\/td>\n<td style=\"width: 370px; border: 1px solid #000000;\">Juniper Netscreen<\/td>\n<td style=\"width: 370px; border: 1px solid #000000;\">1.1.1.1<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 370px; border: 1px solid #000000;\">Remote Peer<\/td>\n<td style=\"width: 370px; border: 1px solid #000000;\">Cisco ASA<\/td>\n<td style=\"width: 370px; border: 1px solid #000000;\">2.2.2.2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"Topology\"><\/span><strong>Topology<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Below shows the network topology that our example is based upon.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Netscreen\"><\/span><strong>Netscreen<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Below shows the Juniper Netscreen configuration steps. The configuration is pretty standard. However one interesting point is the way in which a route based VPN with an interface based MIP is used. To ensure that only traffic destined to our remote endpoint (172.16.2.0\/24) is NAT`d we create a network based MIP which is assigned to the tunnel interface. Then just like any standard route based VPN a route is created ensuring that only traffic for the remote endpoint is sent to the tunnel interface.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Configure_Tunnel_Interface\"><\/span><strong>Configure Tunnel Interface<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p class=\"codemulti\">set interface tunnel.1 zone &#8220;vpn&#8221;<br \/>\nset interface tunnel.1 ip 172.16.1.1\/24<\/p>\n<p>set interface tunnel.1 mip 172.16.1.1 host 192.168.10.1 netmask 255.255.255.0 vrouter \u201ctrust-vr\u201d<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Configure_Routes\"><\/span><strong>Configure Routes<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p class=\"codemulti\">set route 0.0.0.0\/0 interface ethernet0\/3 gateway 1.1.1.100<br \/>\nset route 172.16.2.0\/24 interface tunnel.1<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Address_Books\"><\/span><strong>Address Books<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p class=\"codemulti\">set address &#8220;Trust&#8221; &#8220;local-net&#8221; 192.168.10.0 255.255.255.0<br \/>\nset address &#8220;vpn&#8221; &#8220;remote-net&#8221; 172.16.2.0 255.255.255.0<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Configure_VPN\"><\/span><strong>Configure VPN<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p class=\"codemulti\">set ike p1-proposal &#8220;ike-proposal1&#8221; preshare group2 esp 3des sha-1<br \/>\nset ike p2-proposal &#8220;vpn-proposal1&#8221; group2 esp 3des sha-1<\/p>\n<p>set ike gateway &#8220;remote-ike&#8221; address 2.2.2.2 Main outgoing-interface ethernet0\/3 preshare &#8220;abc123&#8221; proposal &#8220;ike-proposal1&#8221;<\/p>\n<p>set vpn &#8220;remote-vpn&#8221; gateway &#8220;remote-ike&#8221; proposal &#8220;vpn-proposal1&#8221;<br \/>\nset vpn &#8220;remote-vpn&#8221; proxy-id local-ip 172.16.1.0\/24 remote-ip 172.16.2.0\/24 &#8220;ANY&#8221;<br \/>\nset vpn &#8220;remote-vpn&#8221; bind interface tunnel.1<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Configure_Policy\"><\/span><strong>Configure Policy\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p class=\"codemulti\">set policy from &#8220;Trust&#8221; to &#8220;vpn&#8221; &#8220;local-net&#8221; &#8220;remote-net&#8221; &#8220;ANY&#8221; permit<br \/>\nset policy from &#8220;vpn&#8221; to &#8220;Trust&#8221; &#8220;remote-net&#8221; &#8220;MIP(172.16.1.0\/24)&#8221; &#8220;ANY&#8221; permit<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cisco_ASA\"><\/span><strong>Cisco ASA<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Below shows the Cisco ASA configuration steps. The configuration consists of a standard VPN setup with the addition of a policy based NAT statement. This statement consists of an access-list which defines the source and destination i.e when should this statement be triggered. The static statement then uses the source address (192.168.10.0\/24) (that is defined within the POLICYNAT-100 ACL and which can also be thought of as the real address), against the NAT address of 172.16.2.0\/24 (that is defined within the static statement itself).<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Configure_NAT\"><\/span><strong>Configure NAT<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p class=\"codemulti\">access-list POLICYNAT-100 permit ip 192.168.10.0 255.255.255.0 172.16.1.0 255.255.255.0<br \/>\nstatic (inside,outside) 172.16.2.0 255.255.255.0 access-list POLICYNAT-100<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Configure_VPN-2\"><\/span><strong>Configure VPN<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p class=\"codemulti\">access-list ENCDOM-100 permit ip 172.16.2.0 255.255.255.0 172.16.1.0 255.255.255.0<\/p>\n<p>tunnel-group 1.1.1.1 type ipsec-l2l<br \/>\ntunnel-group 1.1.1.1 ipsec-attributes<br \/>\npre-shared-key abc123<\/p>\n<p>crypto isakmp identity address<br \/>\ncrypto isakmp enable outside<br \/>\ncrypto isakmp policy 10<br \/>\nauthentication pre-share<br \/>\nencryption 3des<br \/>\nhash sha<br \/>\ngroup 2<br \/>\nlifetime 86400<\/p>\n<p>crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac<br \/>\ncrypto map outside interface outside<br \/>\ncrypto map outside set transform-set ESP-3DES-SHA<br \/>\ncrypto map outside set pfs group2<br \/>\ncrypto map outside 100 match address ENCDOM-100<br \/>\ncrypto map outside 100 set peer 1.1.1.1<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Configure_Policy-2\"><\/span><strong>Configure Policy<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p class=\"codemulti\">access-list inside permit ip 192.168.10.0 255.255.255.0 172.16.1.0 255.255.255.0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Purpose The purpose of this article is to describe the various steps required to create a site to site VPN between a Cisco ASA and a Juniper Netscreen when both sides have overlapping subnets. Example Within this example each side will have an endpoint of 192.168.10.0\/24. Because of this both sides will present their endpoint &#8230; <a title=\"Cisco ASA &#038; Juniper Netscreen VPN Overlapping Encryption Domains\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\" aria-label=\"Read more about Cisco ASA &#038; Juniper Netscreen VPN Overlapping Encryption Domains\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":704,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cisco ASA &amp; Juniper Netscreen VPN Overlapping Encryption Domains<\/title>\n<meta name=\"description\" content=\"Purpose The purpose of this article is to describe the various steps required to create a site to site VPN between a Cisco ASA and a Juniper Netscreen\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/cisco-asa-to-netscreen-vpn-policy-vpn.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cisco ASA &amp; 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