I'm ali cloud ECS centos7 system according to the online tutorial installation configuration on the server PPTPD
PPTPD. Conf configuration below
Localip 192.168.3.20
Remoteip 192.168.3.10-240

Centos7 information is as follows:
Network IP: 172.25.139.120 nic eth0
IP networks outside: xx, xx. Xx. Xx didn't see the card

I have two clients A, B through VPN connected centos7, network information below
Client A 192.168.3.10 child mask 255.255.255.255 gateway 0.0.0.0
Client B 192.168.3.11 child mask 255.255.255.255 gateway 0.0.0.0

Question:
The client A (192.168.3.10) and centos7 (192.168.3.20) can ping each other
Client B (192.168.3.11) and centos7 (192.168.3.20) can ping each other
But
Client (192.168.3.10) and client B (192.168.3.11) cannot ping

Will not be associated with iptables, iptables state active (exited),

CodePudding user response:

Ping, the echo of judgment

CodePudding user response:

reference 1st floor wj31932 response:

ping, look at the echo judge

When judging what is called the echo, ping what also did not show

CodePudding user response:

Is the client a Linux operating system, too, if so, ping is no display time out, can interrupt ping, implement arp - n see if the other MAC address, so, can tcddump caught on the server, have each other's ping request message arrival, and did not return the reply is the firewall intercept,

CodePudding user response:

The PPTP what mean?
It itself is the relationship between the two, there can be no third intervention, two clients are the third point can is normal,

Additional forwarding/router/NAT all have to think of some way to extra, such as
Expect the PPTP protocol itself is ineffective,