How do you punch trough firewalls? You have to manually open them, punching through firewall would be a firewall vulnerability.
How do you punch trough firewalls? You have to manually open them, punching through firewall would be a firewall vulnerability.
This is a common function of uPnP, which I've seen as features in router config pages since the mid 2000s.
https://en.wikipedia.org/wiki/Universal_Plug_and_Play#NAT_tr...
Typically firewalls will record the src and dst header values of outbound IP packets then temporarily allows inbound IP packets that have those values flipped.