CloudFront Price Class 100 奇怪的現象

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...

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