上个月曾写过一个QT使用Ameritrade Backfill的问题，今天登录后发现，Quote Server的选择列表中只有三个IP了，和之前自己指定的hosts对比一看，竟然刚好是hosts中指定的三个。马上清理了hosts文件中的设置，重新登录QT，依然如此。再次登录服务器，确认了一下最新的域名信息：
可以发现和上次的结果相比，有问题的4个IP已经去掉 ^_^http://www.guduo.net/2011/04/000371.html
$ nslookup ameritrade02.streamer.com
Server: 74.220.195.27
Address: 74.220.195.27#53
Non-authoritative answer:
Name: ameritrade02.streamer.com
Address: 216.105.251.38
Name: ameritrade02.streamer.com
Address: 216.105.251.39
Name: ameritrade02.streamer.com
Address: 216.105.251.37
$ dig ameritrade02.streamer.com
; <<>> DiG 9.6.2-RedHat-9.6.2-0.BH <<>> ameritrade02.streamer.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45673
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 6, ADDITIONAL: 7
;; QUESTION SECTION:
;ameritrade02.streamer.com. IN A
;; ANSWER SECTION:
ameritrade02.streamer.com. 600 IN A 216.105.251.37
ameritrade02.streamer.com. 600 IN A 216.105.251.38
ameritrade02.streamer.com. 600 IN A 216.105.251.39
;; AUTHORITY SECTION:
streamer.com. 86400 IN NS pdns2.ultradns.net.
streamer.com. 86400 IN NS pdns3.ultradns.org.
streamer.com. 86400 IN NS pdns5.ultradns.info.
streamer.com. 86400 IN NS pdns1.ultradns.net.
streamer.com. 86400 IN NS pdns4.ultradns.org.
streamer.com. 86400 IN NS pdns6.ultradns.co.uk.
;; ADDITIONAL SECTION:
pdns1.ultradns.net. 78172 IN A 204.74.108.1
pdns1.ultradns.net. 83795 IN AAAA 2001:502:f3ff::1
pdns2.ultradns.net. 86264 IN A 204.74.109.1
pdns3.ultradns.org. 86329 IN A 199.7.68.1
pdns4.ultradns.org. 86350 IN A 199.7.69.1
pdns5.ultradns.info. 86379 IN A 204.74.114.1
pdns6.ultradns.co.uk. 86398 IN A 204.74.115.1
;; Query time: 216 msec
;; SERVER: 74.220.195.27#53(74.220.195.27)
;; WHEN: Wed May 4 08:18:24 2011
;; MSG SIZE rcvd: 386
--EOF--
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