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ipv4 header — rfc 791 0 8 16 24 32 ver ihl type/svc total length identification flg fragment offset ttl protocol header checksum source ip address destination ip address
gfw active-probing — ensafi 2015 / alice 2020 client gfw proxy tls clienthello serverhello + cert encrypted application data gfw fingerprints flow probe clienthello serverhello probe (variant) → block proxy ip dns header — rfc 1035 0 4 8 12 16 id opcode z rcode qdcount ancount nscount / arcount