This is new signatures of nmap 4.0 for pf.os.
1024:64:0:44:M1460: *NMAP:syn scan:5:NMAP 4.0 syn scan (1) 2048:64:0:44:M1460: *NMAP:syn scan:6:NMAP 4.0 syn scan (2) 3072:64:0:44:M1460: *NMAP:syn scan:7:NMAP 4.0 syn scan (3) 4096:64:0:44:M1460: *NMAP:syn scan:8:NMAP 4.0 syn scan (4)
