Hi, I have a problem with multiple PPTP connection

RouterOS General
1

Hi, I have a problem with multiple PPTP connection thru RouterOS NAT.
My conf: WAN - 10.78.102.197/30
LAN: 192.168.0.0/24
def.g.:10.78.102.198

chain=srcnat out-interface=WAN limit=0,0 action=masquerade
NO firewall filter (all accepted)
PPTP server in ISP network: 81.25.X.67

and problem:
One host in LAN segment connect to ISP PPTP server, all other hosts when connecting to PPTP server return error 721 (destination host unreachable) after window Check username and password. But, if first host disconnect from ISP PPTP server, next one host can connect to PPTP server. All hosts in LAN segment can ping PPTP server any time.

2

Do you have connection tracking turned on? Also, /ip firewall service-ports GRE and PPTP turned on?

Regards

Andrew

3

O! Thanks, I enable service port PPTP and GRE, it work, but I don’t understand what is service port, please shortly write about this.

4

Basically they’re connection helpers. Without them, connection tracking can’t keep track of which GRE packets correspond to which PPTP session once you have more than one connection open.

Regards

Andrew

5

Thank you Andrew.