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标题: 关于dig 命令的疑惑 [打印本页]

作者: chensifeng 时间: 2007-09-20 20:34
标题: 关于dig 命令的疑惑
请教各位一个问题：
我要用dig 监测一个域名的真伪，命令是: dig hostname

但遇到一种情况是: connection timed out; no servers could be reached

用 time dig hostname 测试,一般这种连接超时信息要监测14秒后给出.
为了提高监测速度.我用这个命令: dig hostname +timeout=1
意思监测1秒不通就报告超时

可是,实际操作中,并不能1秒就报告,而是要等待4-6秒(估计跟地理位置和网络状况有关).

请问:如何才能真正控制这个报告超时时间? 谢谢各位!

作者: Qiangxi 时间: 2007-09-26 16:15
[root@localhost ~]# time dig www.yahoo.co.uk

; <<>> DiG 9.3.1 <<>> www.yahoo.co.uk
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4972
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 8, ADDITIONAL: 8

;; QUESTION SECTION:
;www.yahoo.co.uk.             IN    A

;; ANSWER SECTION:
www.yahoo.co.uk.       1800 IN    CNAME www.euro.yahoo-eu1.akadns.net.
www.euro.yahoo-eu1.akadns.net. 300 IN A    217.12.3.11

;; AUTHORITY SECTION:
akadns.net.          8332 IN    NS    asia9.akadns.net.
akadns.net.          8332 IN    NS    za.akadns.org.
akadns.net.          8332 IN    NS    zb.akadns.org.
akadns.net.          8332 IN    NS    zc.akadns.org.
akadns.net.          8332 IN    NS    zd.akadns.org.
akadns.net.          8332 IN    NS    eur1.akadns.net.
akadns.net.          8332 IN    NS    use3.akadns.net.
akadns.net.          8332 IN    NS    usw2.akadns.net.

;; ADDITIONAL SECTION:
za.akadns.org.       1873 IN    A    195.219.3.169
zb.akadns.org.       2204 IN    A    206.132.100.105
zc.akadns.org.       3365 IN    A    124.211.40.4
zd.akadns.org.       779    IN    A    63.209.3.132
eur1.akadns.net.       127012  IN    A    213.254.204.197
use3.akadns.net.       1678 IN    A    204.2.178.133
usw2.akadns.net.       124683  IN    A    65.114.105.4
asia9.akadns.net.    134874  IN    A    220.73.220.4

;; Query time: 365 msec
;; SERVER: 61.177.7.1#53(61.177.7.1)
;; WHEN: Wed Sep 26 17:09:58 2007
;; MSG SIZE  rcvd: 375

real 0m0.371s
user 0m0.002s
sys    0m0.005s

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