topic Re: VPN Connection thru a 678 ADSL router in Network Security https://community.cisco.com/t5/network-security/vpn-connection-thru-a-678-adsl-router/m-p/218544#M1060125 <HTML><HEAD></HEAD><BODY><P>The default setup of the PPTP Windows client uses TCP 1723 and GRE. There are no ports associated with the GRE protocol. Thus, if you are behind a PAT device, the setup will not work. Please confirm if you have NAT Overload or PAT configured. If so, you will need to remove it.</P><P></P></BODY></HTML> Mon, 05 Apr 2004 20:19:03 GMT drolemc 2004-04-05T20:19:03Z VPN Connection thru a 678 ADSL router https://community.cisco.com/t5/network-security/vpn-connection-thru-a-678-adsl-router/m-p/218543#M1060119 <P>How do I configure a 678 ADSL router/Modem to pass PPTP VPN traffic. I have a VPN appliance on the inside lan and want to access it from the outside address. I used this VPN appliance on a Cable modem and it worked fine. I tried usig nat to forward tcp port 1723 but that didn't do it. I am guessing that I am having trouble with the GRE(47) protocol.</P> Fri, 21 Feb 2020 07:19:08 GMT https://community.cisco.com/t5/network-security/vpn-connection-thru-a-678-adsl-router/m-p/218543#M1060119 admin_2 2020-02-21T07:19:08Z Re: VPN Connection thru a 678 ADSL router https://community.cisco.com/t5/network-security/vpn-connection-thru-a-678-adsl-router/m-p/218544#M1060125 <HTML><HEAD></HEAD><BODY><P>The default setup of the PPTP Windows client uses TCP 1723 and GRE. There are no ports associated with the GRE protocol. Thus, if you are behind a PAT device, the setup will not work. Please confirm if you have NAT Overload or PAT configured. If so, you will need to remove it.</P><P></P></BODY></HTML> Mon, 05 Apr 2004 20:19:03 GMT https://community.cisco.com/t5/network-security/vpn-connection-thru-a-678-adsl-router/m-p/218544#M1060125 drolemc 2004-04-05T20:19:03Z