I'm trying to understand if IP Spoofing is really possible in 2022.
I generally found old documents which explains how you cannot trust the source IP for UDP connections and for the first SYN packet of a TCP conection. I also remember attempts to guess the ACK value in order to blindly establish the TCP connection, etc.
Recent sites are more or less advertising operations.
What I would like to understand is how current that information is.
Peering AS now (generally) filter the routing tables preventing bogus announcements to spread while a few years ago your neighboring AS could just claim to be a better route for whatever subnet in the world...
ISPs should not allow people to send bogus packets, as peering AS should filter the routing announcements, but is that generally done?
I suppose I should not trust too much some spam/hacker friendly countries, but what about the others?