Roy Tam says to YSITD
自己的hkbn cat5 direct connect # lft -A -N -m3 -l2 8.8.8.8:53 Tracing .......*.**********.***!***...........T TTL LFT trace to google-public-dns-a.google.com (8.8.8.8):53/tcp 2 [AS?] [NULL] 10.239.64.41 1.1/1.2/1.2ms 3 [9269] [HKBN] 014199252205.ctinets.com (14.199.252.205) 4.2/3.4/3.2ms 4 [9269] [HKBN] 014136128214.ctinets.com (14.136.128.214) 1.7/1.6/1.6ms 5 [15169] [GOOGLE] 72.14.196.85 1.8/1.8/1.8ms 6 [15169] [GOOGLE] 108.170.241.102 1.8/1.9/1.8ms 7 [15169] [GOOGLE] 216.239.40.13 2.9/4.0ms 8 [15169] [GOOGLE] 216.239.63.215 37.3ms 9 [15169] [GOOGLE] 216.239.48.73 38.1ms ** [neglected] no reply packets received from TTLs 10 through 17 ** [4.2-3 BSD bug?] the next gateway may errantly reply with reused TTLs 18 [15169] [LVLT-GOGL-8-8-8] [target open] google-public-dns-a.google.com (8.8.8.8):53 38.1ms # lft -A -N -m3 -l2 8.8.4.4:53 Tracing .....................T TTL LFT trace to google-public-dns-b.google.com (8.8.4.4):53/tcp 2 [AS?] [NULL] 10.239.65.41 1.1/1.2/1.2ms 3 [9269] [HKBN] 014199254205.ctinets.com (14.199.254.205) 7.5/11.9/8.6ms 4 [9269] [HKBN] 014136129214.ctinets.com (14.136.129.214) 1.6/2.6/1.8ms 5 [15169] [GOOGLE] 72.14.196.85 2.0/2.3/1.8ms 6 [15169] [GOOGLE] 108.170.241.33 2.7/2.7/2.7ms 7 [15169] [GOOGLE] 216.239.51.241 2.1/2.1/2.0ms 8 [15169] [LVLT-GOGL-8-8-4] [target open] google-public-dns-b.google.com (8.8.4.4):53 2.2/2.2/2.2ms