剛剛發現奇怪的現象,晚點來問問看好了... 手上的 test-priceclass100.gslin.org
設定為 Only Use US and Europe:
但在 SmokePing 上卻看到極低的 latency 而覺得納悶:
動手查了一些資料發現是被導到台灣的點... 可以看到先問 168.95.192.1 (HiNet 光世代預設的 DNS) 後得到了這些 IP:
gslin@GSLIN-HOME1404 [~] [02:43/W4] dig test-priceclass100.gslin.org @168.95.192.1
; <<>> DiG 9.9.5-3ubuntu0.5-Ubuntu <<>> test-priceclass100.gslin.org @168.95.192.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48453
;; flags: qr rd ra; QUERY: 1, ANSWER: 9, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 3072
;; QUESTION SECTION:
;test-priceclass100.gslin.org. IN A
;; ANSWER SECTION:
test-priceclass100.gslin.org. 300 IN CNAME d265g70k07is7o.cloudfront.net.
d265g70k07is7o.cloudfront.net. 60 IN A 54.192.215.203
d265g70k07is7o.cloudfront.net. 60 IN A 54.192.215.98
d265g70k07is7o.cloudfront.net. 60 IN A 54.239.176.96
d265g70k07is7o.cloudfront.net. 60 IN A 54.192.214.40
d265g70k07is7o.cloudfront.net. 60 IN A 54.239.176.216
d265g70k07is7o.cloudfront.net. 60 IN A 54.192.212.118
d265g70k07is7o.cloudfront.net. 60 IN A 54.239.176.223
d265g70k07is7o.cloudfront.net. 60 IN A 54.239.176.56
;; Query time: 178 msec
;; SERVER: 168.95.192.1#53(168.95.192.1)
;; WHEN: Thu Oct 22 02:43:24 CST 2015
;; MSG SIZE rcvd: 228
接下來跑 mtr 看,發現是台灣的節點:
gslin@GSLIN-HOME1404 [~] [02:43/W4] mtr --report -n 54.239.176.56
Start: Thu Oct 22 02:43:37 2015
HOST: GSLIN-HOME1404 Loss% Snt Last Avg Best Wrst StDev
1.|-- 168.95.98.254 0.0% 10 8.6 9.1 8.4 9.9 0.3
2.|-- 168.95.25.50 0.0% 10 8.1 9.0 8.0 9.9 0.3
3.|-- 220.128.11.226 0.0% 10 9.3 11.8 8.1 31.7 7.1
4.|-- 220.128.5.94 0.0% 10 12.9 13.9 9.6 17.9 2.9
5.|-- 220.128.4.177 0.0% 10 8.7 13.1 8.7 35.3 8.0
6.|-- 203.75.228.29 0.0% 10 9.9 10.1 9.3 10.9 0.3
7.|-- 223.26.65.19 0.0% 10 9.4 10.3 9.4 11.4 0.3
8.|-- 202.133.255.122 0.0% 10 11.0 10.8 9.5 13.5 1.0
9.|-- 54.239.176.56 0.0% 10 10.7 9.4 8.4 10.7 0.7
這是哪招呢...