智能DNS进阶.pptVIP

Nslookup Nslookup是通用的域名查询工具 绝大多数系统都自带有这个工具 直接执行nslookup进入交互界面 默认使用/etc/resolv.conf设置的DNS 可以在交互界面执行server指定DNS Nslookup $ nslookup Server: Address: #53 Non-authoritative answer: canonical name = . Name: Address: 11 Nslookup $ nslookup server 0 Default server: 0 Address: 0#53 Server: 0 Address: 0#53 Non-authoritative answer: canonical name = . Name: Address: 11 Ping Ping(Packet Internet Groper) 用于检测网络连接的工具 使用方式： ping Ping $ ping PING (11): 56 data bytes 64 bytes from 11: icmp_seq=0 ttl=54 time=18.391 ms 64 bytes from 11: icmp_seq=1 ttl=54 time=21.532 ms 64 bytes from 11: icmp_seq=2 ttl=54 time=21.237 ms 64 bytes from 11: icmp_seq=3 ttl=54 time=24.806 ms ^C --- ping statistics --- 4 packets transmitted, 4 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 18.391/21.491/24.806/2.273 ms Time值越小，网络速度越快 Queryperf Bind自带的性能测试工具 在bind的源码包中能找到 运行格式： queryperf –s dnsserver –d testfile Queryperf $ /opt/bin/queryperf -s -d /opt/etc/1..txt DNS Query Performance Testing Tool Version: $Id: queryperf.c,v 1.12 2007/09/05 07:36:04 marka Exp $ [Status] Processing input data [Status] Sending queries (beginning with ) [Status] Testing complete Statistics: Parse input file: once Ended due to: reaching end of file Queryperf Queries sent: 10050 queries Queries completed: 10050 queries Queries lost: 0 queries Queries delayed(?): 0 queries RTT max: 0.161299 sec RTT min: 0.000598 sec RTT average: 0.003469 sec RTT std deviation: 0.009180 sec RTT out of range: 0 queries Percentage completed: 100.00% Percentage lost: 0.00% Started at: Mon Dec 17 09:43:32 2012 Finished at: Mon Dec 17 09:43:34 2012 Ran for: 1.767174 seconds Queries per second: 5687.046097 qps 参考资料 《DNS与BIND》 《BIND9管理员参考手册》 相关RFC规范 RFC1034 域名 - 概念和工具 RFC1035 域名 - 实现和规范 RFC1123 Internet 主机 - 应用和支持的要求 RFC1886 支持 IP 版本 6 的 DNS 扩展名 RFC199