Instable connection causes DoS attack

se232 · Post by **se232** » Tue Apr 28, 2015 8:08 pm

Hi! I am trying to setup a VPN connection between my main Location in A and a branch in an B and one in C, which is currently still offline). The Problem is, that the Connection from B to A is established, but after a couple of seconds to a few minutes it is automatically disconnected. The many reconnection tries cause a DoS attack recognition, so DoSProction has to be switched off.
When the Connection is established I am also not able to successfully ping through the tunnel (I can see that Messages arrive from A to B, but nothing Comes back).

My topology is a layer3 routing: A has 10.1.1.254/255.255.0.0, B has 10.3.1.254/255.255.0.0, and C will have 10.2.1.254/255.255.0.0 (in the future).
In A is the layer 3 Switch with the 3 virtual Interfaces for A, B and C.

The Softether Routers are not the Routers into the Internet (I added a static route to the softether virtual Network Card 10.x.1.254). The Internet Routers are Netgear ReadyNAS: A has a RN314 (x86), B and C a RN102 (arm).

SoftEther Version is
on the x86: 4.12 build 9514 (64 bit)
on the arm: 4.12 build 9514 (32 bit)

Who can support?

Post by **thisjun** » Thu May 14, 2015 7:45 am

Please tell me more information.
What OS do you use?
What software do you install in A or B or C?
Did you create a localbridge?
Do you use SecureNAT?

se232 · Post by **se232** » Thu May 14, 2015 2:12 pm

What OS do you use? The Internet Routers are Netgear ReadyNAS: A has a RN314 (x86), B and C a RN102 (arm). The used Version was 6.2.2
What software do you install in A or B or C?
SoftEther Version is
on the x86: 4.12 build 9514 (64 bit) A
on the arm: 4.12 build 9514 (32 bit) B and C
Did you create a localbridge? Yes, this works for all IP adresses except the local one (Softether on 10.1.1.14 cannot access services running on 10.1.1.14)
Do you use SecureNAT? No!

Post by **thisjun** » Thu May 28, 2015 6:24 am

Please try to check "Disable UDP Acceleration" in "Advanced Settings" of the cascade connection setting.

se232 · Post by **se232** » Thu May 28, 2015 7:07 am

I tried this, but without any success.
The only successful and stable connection is between 2 ARM based systems (NETGEAR RN102 and RN102). It seems, that the connection between a RN102 (ARM based) and the RN314 (x86 based) causes this problem.

Post by **thisjun** » Thu Jun 11, 2015 5:22 am

Could you show server log?
Is disconnection interval regular?

Instable connection causes DoS attack

Instable connection causes DoS attack

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