This option replaces built-in fake packets with the user-supplied
ones, could be used multiple times (up to 30).
Each fake packet loaded with this option is sent in command
line order, every time (on each TLS ClientHello or HTTP GET/POST).
This method sends Fake Packet with the TCP SEQ/ACK numbers "in the past":
-66000 is used for ACK (right out of the ACK permissive window in Linux stack),
-10000 is used for SEQ (without any reasoning).
This method is pretty effective in Russia.
It also could be handy in a networks which prohibit changing TTL values
(mobile networks with tethering block/premium feature).
Before: --set-ttl and --wrong-chksum generated single Fake Packet with both low TTL and incorrect checksum.
Now: --set-ttl and --wrong-chksum generate two packets: one with low TTL, another with incorrect checksum.
ValdikSS