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SecureNAT is off, still seeing unknown hosts on interfaces

Posted: Thu May 11, 2017 3:59 pm
by n3n5n1
Hello,

I can see SoftEther VPN Server and VPN Client (both Debian) getting weird traffic on their respective virtual TAP interfaces.

It's all ARP traffic as far as I could see (unknown host asks my primary TAP address for who-has and gets a reply).

I read that this could be due to SecureNAT feature enabled for Virtual Hubs. I disabled it, but I still can see these garbage ARPs.

Since I plan to route quite a number of networks via this main VPN Server, I need to be 100% sure there's no virtual hosts taking address space.

Advice please?

Thank you.

Re: SecureNAT is off, still seeing unknown hosts on interfac

Posted: Thu May 25, 2017 6:24 am
by thisjun

Re: SecureNAT is off, still seeing unknown hosts on interfac

Posted: Fri Jun 09, 2017 8:03 am
by n3n5n1
Thank you for the reply. I've disabled SecureNAT feature but I still keep seeing weird unknown network addresses sending ARPs across the tunnel. I will investigate further, but would be grateful for any thoughts people may have on the matter.

Re: SecureNAT is off, still seeing unknown hosts on interfac

Posted: Thu Jun 22, 2017 6:37 am
by thisjun
Did you check '11.1.20 I am not performing any communication over the VPN, but packets are being sent to the Internet periodically'?.