on centos7.6, when run client, all the network lost connection about dsvpn

[jedisct1]

What exactly is being displayed, both server-side and client-side?

[morganwang010]

What exactly is being displayed, both server-side and client-side?
I run the client-side at the virtualbox vms. And it occurs only on the client-side. The server-side is ok.
at client-side , the route list, the ip address , looks all good. Sometime, the tun0 iface was not created. When ping a ipaddress which is at the same subnet of the iface, it says network is unreachable. seems the network was broken .

[morganwang010]

moreover, I occasionally make the client connects to server successfully.
After the connection is suceess, I add the default route :
#route del default
#route add default dev tun0
but when I use the command telnet google.com 80 at the client-side, the servier-side suddenly quit . May be something wrong with my virtualbox vms.

[jedisct1]

You shouldn't have to manually add routes.

If you type route del default/route add default dev tun0 (does the route command still exist on Linux?), there are no more routes for the machine to communicate with the server.

Without knowing what is being displayed server-side and client-side, it's unfortunately impossible to help.

[dazuimao1990]

I had the same problem,When I started dsvpn_client, the connection to my gateway is unreachable.
This led to the dsvpn_client can not connect to the server.the tun0 interface have no ip address.
the only way to repair my network is reboot the OS.

[dazuimao1990]

how about reopen this issue? I do not know what is going wrong with my dsvpn client. waiting for help.

[jedisct1]

Unfortunately, I don't know much about Linux and I've never used CentOS so I won't be able to help. But since you do, I'm waiting for your help.

[dazuimao1990]

OK，I'm still trying.
First, I tried to upgrade all the packages,with the command yum update. It doesn't work.
and then,I had upgrade my kernel,I admit I didn't notice the requirement for a higher kernel version.
for this time,I can ping the gateway.but lost Internet connection.I don't know how to continue.

Can you provide an available environment configuration information. Include Linux distributions, kernel versions, virtual machines, or physical machines.

Thank you, my friend.

[dazuimao1990]

hello, I tried something new.
I found that traffic to the Internet now passes through the tun0 interface, which makes the Internet inaccessible.

tun0 is inited by dsvpn_client.

when I stop the dsvpn_client.the Internet connection came back.

In fact , my route tells the icmp packages should through the ens18 interface and default gateway. only The address to dsvpn_server goes through tun0.My route below:

PS: I am using ubuntu 1604 with a 5.4.0-050400-generic kernel.

[dazuimao1990]

#54 (comment)

This response finally solved my problem.

hahah! I should know more about other issues.