Hi everyone!
One of my costumers is connected to my Internet network (im an isp), the costumer is using dynamic nat, and on the other end, there is a PPTP server (on a hosted environment), the costumer complains that sometimes can´t connect throught the pptp tunnel, but i always see the TCP port 173, and after that, the GRE session..but the problem is that the costumer can´t make it works..
As an example, this is a snapshot of the nat translation:
ADVERTISING#sh ip nat translations | i 148.244.244
tcp <IP_ADDRESS_OUTSIDE>:1329 192.168.1.132:1329 <PPTP_IP_ADDRESS>:3389 <PPTP_IP_ADDRESS>:3389
gre <IP_ADDRESS_OUTSIDE>:57 192.168.1.133:256 <PPTP_IP_ADDRESS>:256 <PPTP_IP_ADDRESS>:57
tcp <IP_ADDRESS_OUTSIDE>:1026 192.168.1.133:1049 <PPTP_IP_ADDRESS>:1723 <PPTP_IP_ADDRESS>:1723
gre <IP_ADDRESS_OUTSIDE>:50145 192.168.1.133:50145 <PPTP_IP_ADDRESS>:50145 <PPTP_IP_ADDRESS>:50145
gre <IP_ADDRESS_OUTSIDE>:23 192.168.1.134:256 <PPTP_IP_ADDRESS>:256 <PPTP_IP_ADDRESS>:23
tcp <IP_ADDRESS_OUTSIDE>:1114 192.168.1.134:1114 <PPTP_IP_ADDRESS>:1723 <PPTP_IP_ADDRESS>:1723
gre <IP_ADDRESS_OUTSIDE>:17376 192.168.1.134:17376 <PPTP_IP_ADDRESS>:17376 <PPTP_IP_ADDRESS>:17376
tcp <IP_ADDRESS_OUTSIDE>:1025 192.168.1.135:1077 <PPTP_IP_ADDRESS>:3389 <PPTP_IP_ADDRESS>:3389
tcp <IP_ADDRESS_OUTSIDE>:1054 192.168.1.138:1036 <PPTP_IP_ADDRESS>:3389 <PPTP_IP_ADDRESS>:3389
gre <IP_ADDRESS_OUTSIDE>:2 192.168.1.139:256 <PPTP_IP_ADDRESS>:256 <PPTP_IP_ADDRESS>:2
gre <IP_ADDRESS_OUTSIDE>:994 192.168.1.139:994 <PPTP_IP_ADDRESS>:994 <PPTP_IP_ADDRESS>:994
tcp <IP_ADDRESS_OUTSIDE>:1036 192.168.1.139:1052 <PPTP_IP_ADDRESS>:3389 <PPTP_IP_ADDRESS>:3389
tcp <IP_ADDRESS_OUTSIDE>:1268 192.168.1.139:1268 <PPTP_IP_ADDRESS>:1723 <PPTP_IP_ADDRESS>:1723
gre <IP_ADDRESS_OUTSIDE>:9 192.168.1.143:256 <PPTP_IP_ADDRESS>:256 <PPTP_IP_ADDRESS>:9
As you can see, there is NAT on the CPE in order to change the 192.168.1.x IP to a public ip address (source to the PPTP Server), on the server side, there is another NAT in order to have a public ip address <PPTP_IP_ADDRESS>..
This is the debug attached..
Does anyone have an idea what can be happening??im new about pptp...thank you very much in advice!
Alfonso
