我正在通过 ADSL/PPPoA -> PPPoE 桥设置我的 Linux（基于 Debian）路由器的 PPPoE 连接。连接在路由器本身上工作正常，但由于某种原因，通过 NAT 的跟踪路由需要很长时间才能获得第一跳（到 NAT）的结果。
大多数情况下，该跃点的结果只是 * * * 但有时该跃点确实会出现，并且在尝试第二个跃点之前会有很长的延迟。
这是根本不显示跳跃的情况：
CallumsMacBookAir:~ Callum$ traceroute google.co.uk
traceroute: Warning: google.co.uk has multiple addresses; using 173.194.41.95
traceroute to google.co.uk (173.194.41.95), 64 hops max, 52 byte packets
1 * * * //LONG DELAY
2 lo0-central10.ptn-ag03.plus.net (195.166.128.192) 22.578 ms 19.925 ms 20.990 ms
3 link-a-central10.ptn-gw01.plus.net (212.159.2.136) 19.574 ms 19.786 ms 19.343 ms
4 xe-5-3-0.ptw-cr01.plus.net (212.159.0.108) 19.540 ms 18.947 ms 25.387 ms
5 72.14.222.97 (72.14.222.97) 19.911 ms 19.706 ms 19.512 ms
6 209.85.246.244 (209.85.246.244) 19.423 ms 19.455 ms 19.655 ms
7 72.14.238.51 (72.14.238.51) 20.234 ms 24.666 ms 20.076 ms
8 lhr08s01-in-f31.1e100.net (173.194.41.95) 19.168 ms 19.518 ms 19.659 ms
有时它确实在第一跳中有响应，但仍然有一个星号：
CallumsMacBookAir:~ Callum$ traceroute google.co.uk
traceroute: Warning: google.co.uk has multiple addresses; using 173.194.41.95
traceroute to google.co.uk (173.194.41.95), 64 hops max, 52 byte packets
1 192.168.0.253 (192.168.0.253) 0.770 ms * 0.800 ms
//LONG DELAY IN HERE
2 lo0-central10.ptn-ag03.plus.net (195.166.128.192) 20.301 ms 22.958 ms 32.719 ms
3 link-a-central10.ptn-gw01.plus.net (212.159.2.136) 19.142 ms 19.417 ms 18.527 ms
4 xe-5-3-0.ptw-cr01.plus.net (212.159.0.108) 19.047 ms 18.781 ms 18.887 ms
5 72.14.222.97 (72.14.222.97) 19.181 ms 19.424 ms 29.965 ms
6 209.85.246.244 (209.85.246.244) 33.559 ms 19.756 ms 25.363 ms
7 72.14.238.51 (72.14.238.51) 32.010 ms 19.753 ms 19.042 ms
8 lhr08s01-in-f31.1e100.net (173.194.41.95) 19.618 ms 19.730 ms *
有没有办法让iptables路由器正确响应traceroute？
谢谢！
答案1
答案是路由器在一个物理接口上有 2 个虚拟接口。通过让 iptables 仅使用虚拟接口 eth0:0 进行路由，问题得到了解决。