DNS 查询死循环 - V2EX
tom82232
V2EX    DNS

DNS 查询死循环

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  •   tom82232 Dec 25, 2017 6242 views
    This topic created in 3086 days ago, the information mentioned may be changed or developed.

    从 2 个不同运行商申请两个域名 A.COMB.NET 配置 A.COM WWW.A.COM CNAME WWW.B.NET 配置 B.NET WWW.B.NET CNAME WWW.A.COM

    客户机访问 WWW.A.COM 进行域名查询,这样在公共 DNS 服务器上( 114.114.114.114 )会形成一个死循环吗? 会的话配置几个,然后进行域名查询是否会资源耗尽,系统一直在来回查询。

    11 replies    2017-12-28 10:13:09 +08:00
    wwqgtxx
        1
    wwqgtxx  
       Dec 25, 2017
    我记得 dns 貌似是直接返回 CNAME 的结果让客户端自行再请求一次的吧
    geekzu
        2
    geekzu  
       Dec 26, 2017 via Android
    会死循环,我有一次配置错误就是这样的效果,但是并不会对递归 dns 和权威 dns 造成什么影响
    tom82232
        3
    tom82232  
    OP
       Dec 26, 2017
    @geekzu 这样的话不是很容易对公共 DNS 形成攻击。
    jimzhong
        4
    jimzhong  
       Dec 26, 2017
    公共 DNS 应该会做递归查询,但是会限制递归深度。
    johnjiang85
        5
    johnjiang85  
       Dec 26, 2017
    1. 会限制递归深度
    johnjiang85
        6
    johnjiang85  
       Dec 26, 2017
    2. 会检测 cname 循环报错
    HalloCQ
        7
    HalloCQ  
       Dec 26, 2017
    @johnjiang85 <img src=" "/>
    HalloCQ
        8
    HalloCQ  
       Dec 26, 2017
    @johnjiang85 广州移动
    HalloCQ
        9
    HalloCQ  
       Dec 26, 2017
    @HalloCQ 是广州联通。我估计是还恋恋不忘移动
    johnjiang85
        10
    johnjiang85  
       Dec 26, 2017
    @HalloCQ +nocookie
    HalloCQ
        11
    HalloCQ  
       Dec 28, 2017
    @johnjiang85 ok 了,谢谢
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