The default firewall configurations do not include action=fasttrack-connection on the input chain. Why is this? Is there any reason it is a bad idea? It seems to me to be a good idea when using VPN or PPP.
it only work for forward, all input/output traffic needs to be in slowpath as it always requires some kind of processing.
Running SSTP it seems like a lot of packets are going through fasttrak on the input chain once I enabled it, and the connection quality improved.
packets that is going through the router from SSTP to other interface are going via forward, that is why you see increase, only SSTP managment packets go to input.
Theres no fasttrack for input output chain, this is because there is no processing to be done on the packet. In the input and output chain you can imagine it as some server running. When the server sends out a packet, theres no NAT that is required for that packet as the source/destination address isnt changed ever. So there really is no processing to be done on the packet itself other than the filtering you’ve set up.
Fasttrack only works on things that require changing the source and destination address.