You have probably answered this question in your head before reading this... "packet loss over the VPN = MTU is wrong"... right? but where!?!?
Do this with me, but remember my two sites are across the internet, and im connected to the internet via 4G...
MT SERVER
Enable PPTP server... settings default:
Max MTU 1450
Max MRU 1450
MRUU disabled
Give the a server IP of 10.0.0.1
and use a profile WITHOUT encryption
MT CLIENT
PPP, create Client, settings:
Connect to: XX.XX.XX.XX
User, password, etc
again no encryption
Max MTU 1450
Max MRU 1450
.. and now connect... great, you are connected!
From the client: Tools, Ping: 10.0.0.1
Ping stats come pack perfect!! 40ms no loss, great!!
Again on the Client do this:
Tools, Bandwidth Test
Test To 10.0.0.1, with default settings:
UDP
UDP Size: 1500
Remote UDP Size: 1500
Direction: Send <--------------- First see send (This where this client transmits to the server)
Results are great: NO LOSS!!
Now change it to Receive, and test again, without changing any settings.
TERRIBLE RESULTS!!
I get loss of up 200 packets
Please someone explain this to me, and help me to fix this - ill be transmitting SIP / voice over these VPN connections and currently the voice quality is terrible... understandably since the loss is crazy.