topic Re: GRE Tunnel on cisco 831 in Network Security https://community.cisco.com/t5/network-security/gre-tunnel-on-cisco-831/m-p/497397#M1056206 <HTML><HEAD></HEAD><BODY><P>Hi Rick,</P><P>I have already know.</P><P>Thank you for your help very much!</P><P></P><P></P><P></P><P>CP</P></BODY></HTML> Thu, 26 May 2005 02:37:14 GMT changpinlin 2005-05-26T02:37:14Z GRE Tunnel on cisco 831 https://community.cisco.com/t5/network-security/gre-tunnel-on-cisco-831/m-p/497395#M1056202 <P>Hi ,</P><P>Who can tell me how to config ipsec over GRE tunnel when remote side useing dynamic ip !</P><P></P><P>Thanks!</P> Fri, 21 Feb 2020 08:10:13 GMT https://community.cisco.com/t5/network-security/gre-tunnel-on-cisco-831/m-p/497395#M1056202 changpinlin 2020-02-21T08:10:13Z Re: GRE Tunnel on cisco 831 https://community.cisco.com/t5/network-security/gre-tunnel-on-cisco-831/m-p/497396#M1056204 <HTML><HEAD></HEAD><BODY><P>Cisco has introduced a feature designed to do exactly what you are asking. You can configure an IPSec VPN over GRE tunnel where the remote has dynamic IP using the feature of Dynamic Multipoint VPN (DMVPN).</P><P></P><P>The key concept here is that the remote side must initiate the tunnel to the central side. In the message requesting the tunnel the remote indicates what address the central should use as the tunnel destination.</P><P></P><P>I have configured it in the lab and it worked pretty well. I have not yet used it in a production environment.</P><P></P><P>This URL should help you get started with this:</P><P><A class="jive-link-custom" href="http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080110ba1.html" target="_blank">http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080110ba1.html</A></P><P></P><P></P><P>HTH</P><P></P><P>Rick</P></BODY></HTML> Wed, 25 May 2005 13:02:58 GMT https://community.cisco.com/t5/network-security/gre-tunnel-on-cisco-831/m-p/497396#M1056204 Richard Burts 2005-05-25T13:02:58Z Re: GRE Tunnel on cisco 831 https://community.cisco.com/t5/network-security/gre-tunnel-on-cisco-831/m-p/497397#M1056206 <HTML><HEAD></HEAD><BODY><P>Hi Rick,</P><P>I have already know.</P><P>Thank you for your help very much!</P><P></P><P></P><P></P><P>CP</P></BODY></HTML> Thu, 26 May 2005 02:37:14 GMT https://community.cisco.com/t5/network-security/gre-tunnel-on-cisco-831/m-p/497397#M1056206 changpinlin 2005-05-26T02:37:14Z