我已经完成ntpq，然后运行associations并收到以下内容：

ind assid status  conf reach auth condition  last_event cnt
===========================================================
  1 12097  c811   yes  none   yes    reject    mobilize  1

从man ntp-decode（Peer Status）的文档中，我了解到第一个数字表示Status，第二个Select，第三个Count和第四个Code。

我试图找到 Select Status本手册的部分并找到以下内容：

The Select Field displays the current selection status. (The T Field in the following table gives the corresponding tally codes used in the ntpq peers dis-
play.) The values are coded as follows:

+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        Code             |            Message                    |            T             |            Description                                      |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        0                |            sel_reject                 |                          |            discarded as not valid (TEST10-TEST13)           |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        1                |            sel_falsetick              |            x             |            discarded by intersection algorithm              |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        2                |            sel_excess                 |            .             |            discarded by table overflow (not used)           |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        3                |            sel_outlyer                |            -             |            discarded by the cluster algorithm               |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        4                |            sel_candidate              |            +             |            included by the combine algorithm                |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        5                |            sel_backup                 |            #             |            backup (more than tos maxclock sources)          |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        6                |            sel_sys.peer               |            *             |            system peer                                      |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        7                |            sel_pps.peer               |            o             |            PPS peer (when the prefer peer is valid)         |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+

那么，这个8数字Select Status是什么意思呢？

介绍

我正在尝试在运行BIRD 路由守护程序的两台主机之间使用 RIPv2 协议建立基本通信。

我有一个有地址Host A的接口。 我有另一台主机，其接口具有 address 。这些接口通过电缆直接连接。如果我在两台机器上添加静态路由，我可以在两台机器之间 ping 通。enp010.0.1.50/24
Host Benp110.1.1.25/24

配置文件

我有以下bird.conf内容Host A：

protocol kernel {
        learn;                  # Learn all alien routes from the kernel
        persist;                # Don't remove routes on bird shutdown
        scan time 20;           # Scan kernel routing table every 20 seconds
        export all;             # Default is export none
}

protocol device {
    scan time 10;           # Scan interfaces every 10 seconds
}

protocol direct {
        interface "enp0"
}

protocol rip MyRIP {    
    export all;
    import all;
    interface "enp0" { mode multicast;};
}

bird.confonHost B是相同的，除了替换enp0为enp1

初步结果

在两台主机上启动鸟守护程序后，我可以做一个tcpdump -ni enp0 -vv

13:21:41.943537 IP (tos 0xc0, ttl 1, id 4933, offset 0, flags [none], proto UDP (17), length 132)
    10.1.1.25.520 > 224.0.0.9.7742: [udp sum ok] UDP, length 104
13:21:41.943704 IP (tos 0xc0, ttl 1, id 150, offset 0, flags [none], proto UDP (17), length 272)
    10.0.1.50.520 > 224.0.0.9.7742: [bad udp cksum 0xec48 -> 0x1219!] UDP, length 244

我可以跳入birdcl命令行并运行show rip neighbors并获得一个空表。

让它发挥作用

如果我将地址设置在同一个子网上，我可以运行show rip neighbors并且可以10.0.1.50在我的邻居列表中看到。

包起来

如果链路的两端不在同一个子网上，如何让这些路由器将彼此列为邻居？

我必须对网络如何工作有某种不正确的心理画面，路由器不需要一直与不在同一子网上的邻居通话吗？

我没有挂断特定于 BIRD 的答案。