Need help for RRAS VPN

%3CLINGO-SUB%20id%3D%22lingo-sub-2116538%22%20slang%3D%22en-US%22%3ENeed%20help%20for%20RRAS%20VPN%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2116538%22%20slang%3D%22en-US%22%3E%3CP%3EHello%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EI%20created%20a%20RRAS%20VPN%20for%20my%20self%20on%20my%20laptop%20(win%20server%202019)%2C%20my%20laptop%20is%20connected%20to%20the%20internet%20via%20Modem%20and%20i%20use%20a%20DDNS%20instead%20of%20static%20IP.%26nbsp%3B%3C%2FP%3E%3CP%3Ei%20can%20connect%20to%20my%20home%20network%20with%20PPTP%20VPN%20(windows%20built-in)%20from%20internet%20but%20i%20cant%20get%20ping%20or%20establish%20a%20remote%20connection%20to%20my%20laptop%20(server)%20or%20other%20PCs%20in%20my%20home%20network.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EPort%20forwarding%20is%20configured%20and%20required%20Ports%20are%20open%20in%20modem.%3C%2FP%3E%3CP%3ERequired%20ports%20are%20open%20(%3CSPAN%3E1723%3C%2FSPAN%3E%2C%3CSPAN%3E3389%3C%2FSPAN%3E)%20on%20server%20firewall.%3C%2FP%3E%3CP%3EDHCP%20and%20RRAS%20(NAT%2C%20DHCP%20agent)%20are%20configured%20as%20i%20know.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3Ewhat%20is%20problem%20%3F%3C%2FP%3E%3CDIV%3E%3CDIV%20class%3D%22gtx-trans-icon%22%3E%26nbsp%3B%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2116538%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3ERRAS%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EVPN%20server%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-2116792%22%20slang%3D%22en-US%22%3ERe%3A%20Need%20help%20for%20RRAS%20VPN%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2116792%22%20slang%3D%22en-US%22%3E1723%20and%2047%20are%20opened%20in%20port%20forwarding%20and%20NAT%20!%3C%2FLINGO-BODY%3E%3CLINGO-SUB%20id%3D%22lingo-sub-2116600%22%20slang%3D%22en-US%22%3ERe%3A%20Need%20help%20for%20RRAS%20VPN%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2116600%22%20slang%3D%22en-US%22%3E%3CP%3E%3CSPAN%3EThe%20Generic%20Route%20Encapsulation%20(GRE)%20protocol%20is%20used%20in%20conjunction%20with%20PPTP.%20Data%20or%20payload%20that%20is%20going%20to%20pass%20through%20the%20tunnel%20is%20given%20a%20Point-to-Point%20Protocol%20(PPP)%20header%20and%20then%20placed%20inside%20a%20GRE%20packet.%20The%20GRE%20packet%20carries%20the%20data%20between%20the%20two%20tunnel%20endpoints.%20After%20the%20GRE%20packet%20has%20arrived%20at%20the%20final%20destination%20(the%20endpoint%20of%20the%20tunnel)%2C%20it%20is%20discarded%20and%20the%20encapsulated%20packet%20is%20then%20transmitted%20to%20its%20final%20destination.%3C%2FSPAN%3E%3C%2FP%3E%0A%3CP%3E%3CSPAN%3E%26nbsp%3B%3C%2FSPAN%3E%3C%2FP%3E%0A%3CP%3E%3CSPAN%3ESo%20I'd%20check%20that%20your%20NAT%20device%20allows%26nbsp%3BTCP%20port%201723%20and%20GRE%20(IP%20protocol%2047)%26nbsp%3B%3C%2FSPAN%3E%3C%2FP%3E%0A%3CP%3E%3CSPAN%3E%26nbsp%3B%3C%2FSPAN%3E%3C%2FP%3E%0A%3CP%3E%3CSPAN%3E%26nbsp%3B%3C%2FSPAN%3E%3C%2FP%3E%0A%3CP%3E%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E
Occasional Contributor

Hello

 

I created a RRAS VPN for my self on my laptop (win server 2019), my laptop is connected to the internet via Modem and i use a DDNS instead of static IP. 

i can connect to my home network with PPTP VPN (windows built-in) from internet but i cant get ping or establish a remote connection to my laptop (server) or other PCs in my home network.

 

Port forwarding is configured and required Ports are open in modem.

Required ports are open (1723,3389) on server firewall.

DHCP and RRAS (NAT, DHCP agent) are configured as i know.

 

what is problem ?

 
2 Replies

The Generic Route Encapsulation (GRE) protocol is used in conjunction with PPTP. Data or payload that is going to pass through the tunnel is given a Point-to-Point Protocol (PPP) header and then placed inside a GRE packet. The GRE packet carries the data between the two tunnel endpoints. After the GRE packet has arrived at the final destination (the endpoint of the tunnel), it is discarded and the encapsulated packet is then transmitted to its final destination.

 

So I'd check that your NAT device allows TCP port 1723 and GRE (IP protocol 47) 

 

 

 

1723 and 47 are opened in port forwarding and NAT !