{"id":317,"date":"2009-09-12T15:55:27","date_gmt":"2009-09-12T15:55:27","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2009\/09\/12\/netscreen-ac-vpn\/"},"modified":"2021-07-24T18:58:37","modified_gmt":"2021-07-24T18:58:37","slug":"netscreen-ac-vpn","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/netscreen-ac-vpn.html","title":{"rendered":"Netscreen &#8211; AC-VPN"},"content":{"rendered":"<p ><span ><strong>AC-VPN<\/strong><br \/><\/span><\/p>\n<p style=\"font-size: 12px;\"><span style=\"font-size: 12px;\" >Auto-connect VPN works with a hub and spoke setup. Once static VPNs have been configured between all the spokes and the hubs, AC-VPN and NHRP (Next Hop Routing Protocol) is configured on each spoke and the hub.<br \/>When traffic is initiated between 2 spokes the traffic is passed via the hub while a dynamic tunnel is established between the 2 spokes. Once this tunnel is established the traffic is passed between the 2 spokes and the previous tunnel terminated.<\/p>\n<p><strong >NHRP<\/strong><\/span><\/p>\n<p><span style=\"font-size: 12px;\" >The Hub in the hub and spoke network is classed as the &#8220;Next Hop Server&#8221; (NHS) and the spoke is referred to as the &#8220;Next Hop Client&#8221;. Messages are then exchanged between the client and the server using NBMA (Non Broadcast Multi Access) messages. By default there are 7 types of NBMA messages along with 2 more that are added by the Netscreen. These are :<\/p>\n<p><\/span><\/p>\n<ul>\n<li><span style=\"font-size: 12px;\" ><strong>Registration Request<\/strong> &#8211; Once a static VPN becomes active between the NHC and the NHS this message is sent containing Client information (such as routing, subnet masks etc)<\/span><\/li>\n<li><span style=\"font-size: 12px;\" ><strong>Registration Reply<\/strong> &#8211; The NHS can ACK or NAK (not Acknowledged) a registration request.<\/span><\/li>\n<li><span style=\"font-size: 12px;\" ><strong>Resolution Request, Resolution Reply<\/strong> &#8211; Added by Screen OS these messages ensure that the client cache of the NHS is update to date.<\/span><\/li>\n<li><span style=\"font-size: 12px;\" ><strong>Purge Request, Purge Reply<\/strong> &#8211; This allows the NHC cache of the NHS to be purged in the event of a NHC being shutdown. <\/span><\/li>\n<li><span style=\"font-size: 12px;\" ><strong>Error Indication <\/strong>&#8211; Logs a NHRP error conditions<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12px;\" >To support AC-VPN Screen OS adds the following message pair :- <br \/><strong>Resolution-set, Resolution-ack<\/strong> &#8211; When a static tunnel is established all the information required for each spoke to set up a tunnel between themselves is sent.<\/span><\/p>\n<p><span ><strong >AC-VPN Restrictions<\/strong><\/span><\/p>\n<ul style=\"font-size: 12px;\">\n<li><span >All VPN tunnels configured toward the hub must be route based.<\/span><\/li>\n<li><span >Automatic key management in phase 1 must be in aggressive mode.<\/span><\/li>\n<li><span >The authentication method must be self-signed certificate and generic PKI.<\/span><\/li>\n<li><span >All spokes must be connected to a single zone on the hub.<\/span><\/li>\n<li><span >Configuring NHRP in multiple instances of virtual routers is supported only on the NHS.<\/span><\/li>\n<\/ul>\n<p ><span ><strong>General Steps<\/strong><\/span><\/p>\n<p><span style=\"font-size: 12px;\" >Configuration on the Hub<\/span><\/p>\n<ol style=\"font-size: 12px;\">\n<li><span >Create a static gateway and VPN.<\/span><\/li>\n<li><span >Create static tunnels to the spokes and bind the VPNs to the tunnels.<\/span><\/li>\n<li><span >Create an AC-VPN gateway profile.<\/span><\/li>\n<li><span >Create an AC-VPN VPN profile.<\/span><\/li>\n<li><span >Enable NHRP on the virtual router.<\/span><\/li>\n<li><span >Select the ACVPN-Profile for NHRP.<\/span><\/li>\n<li><span >Enable NHRP on the tunnel interface.<\/span><\/li>\n<li><span >Configure routing.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-size: 12px;\" >Configuration on Each Spoke<\/span><\/p>\n<ol style=\"font-size: 12px;\">\n<li><span >The hub includes the following:<\/span><\/li>\n<li><span >Create a static tunnel to the hub.<\/span><\/li>\n<li><span >Create a gateway.<\/span><\/li>\n<li><span >Create a VPN gateway.<\/span><\/li>\n<li><span >Create an ACVPN-Dynamic gateway.<\/span><\/li>\n<li><span >Create ACVPN-Dynamic VPN<\/span><\/li>\n<li><span >Enable NHRP on the virtual router<\/span><\/li>\n<li><span >Configure the NHS IP address<\/span><\/li>\n<li><span >Configure the local cache.<\/span><\/li>\n<li><span >Enable NHRP on the tunnel interface.<\/span><\/li>\n<li><span >Configure routing.<\/span><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>AC-VPN Auto-connect VPN works with a hub and spoke setup. Once static VPNs have been configured between all the spokes and the hubs, AC-VPN and NHRP (Next Hop Routing Protocol) is configured on each spoke and the hub.When traffic is initiated between 2 spokes the traffic is passed via the hub while a dynamic tunnel &#8230; <a title=\"Netscreen &#8211; AC-VPN\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/netscreen-ac-vpn.html\" aria-label=\"Read more about Netscreen &#8211; AC-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":[16],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Netscreen - AC-VPN - Fir3net<\/title>\n<meta name=\"description\" content=\"AC-VPN Auto-connect VPN works with a hub and spoke setup. 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