为什么阿里云的路由的第一跳不是网关? - V2EX
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takeshima

为什么阿里云的路由的第一跳不是网关?

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  •   takeshima Aug 31, 2021 4223 views
    This topic created in 1716 days ago, the information mentioned may be changed or developed.

    阿里云的服务器,CentOS 7,用 routel 查看得到的路由表里面 default 的 gateway 是一个 172 开头的内网 ip,也就是我的网关,但是用 traceroute 测试到任何一个公网的 ip 的路由,开头的几跳里面都没有我的网关,而是 10 开头的内网 ip,我的路由表中也没有任何 10 开头的 ip 。

    例如: 我的路由表的 default:

     target gateway source proto scope dev tbl default 172.17.x.x eth0 

    traceroute 的前几跳

    traceroute to bing.com (13.107.21.200), 30 hops max, 60 byte packets 1 10.12.4.46 (10.12.4.46) 1.334 ms 10.4.40.10 (10.4.40.10) 1.323 ms 10.12.16.42 (10.12.16.42) 1.172 ms 2 10.4.44.65 (10.4.44.65) 4.187 ms 10.12.4.73 (10.12.4.73) 4.159 ms * 3 10.54.130.5 (10.54.130.5) 4.114 ms 11.217.0.18 (11.217.0.18) 2.181 ms 11.217.0.50 (11.217.0.50) 2.161 ms 

    所以这里路由表为什么不起作用了呢?

    4 replies    2021-08-31 20:19:49 +08:00
    HertzHz
        1
    HertzHz  
       Aug 31, 2021   1
    traceroute 里的 IP 是路由器任意设置的,如果一个路由器存在多个网卡多个 IP 就会出现这种情况。
    trepwq
        2
    trepwq  
       Aug 31, 2021 via iPhone
    1:1nat
    julyclyde
        3
    julyclyde  
       Aug 31, 2021
    route get 对方 ip 看一下返回内容
    wangyu17455
        4
    wangyu17455  
       Aug 31, 2021
    你自己的虚拟专用网以一个 10 开头的 ip 接入了阿里云的好多个虚拟专用网构成的那个大网,在属于你自己的虚拟专用网里网关的 ip 是 172.xxx(这是你自己设置的),也就是多层 nat ?
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