I’m having a hard time finding all the values to calculate exactly how much overhead is used, and also the optimal TCP MSS value
Essentially I want to run PPPoE over EoIP over one of the VPN options so that it works behind NAT
I know that fragmentation will occur but I want to calculate the overhead losses for the biggest possible frame size and at least try and mitigate some fragmentation with the correct TCP MSS size
I still don’t know which is the best way to go about it. I need the data to be encrypted as well, should I be using…
Layer 2 mean bridged network and Layer 3 for routed network.. why you prefer to use pppoe over L2TP ( if mean carrying pppoe_client customer to pppoe_server over l2tp )connection on Layer 3 network ?
I am interested in this topic and I wonder which one might be better and why. can you share some experience ?
The less encapsulations the better. So let’s translate your list to highlight this:
PPTP + EoIP/IPsec => EoIP over IPsec over PPTP
L2TP/IPsec + EoIP => EoIP over L2TP over IPsec (causing issues if two such clients are NATed to the same public address, see the reason and the solution)
L2TP + EoIP/IPSec => EoIP over IPsec over L2TP
SSTP + EoIP => EoIP over SSTP
IPSec/IKEv2 + EoIP => EoIP over IPsec
So the real choice should be among the last two. SSTP is somewhat simpler to understand and configure but it uses TCP as transport which makes it a bad choice for any UDP based real-time application (such as VoIP or video streaming using UDP); it has its drawbacks also for TCP applications, and I’m afraid that PPPoE is closer to UDP in terms of preferred handling of packet loss.
