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服务器无法找到到 api.twitter.com 的路由

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服务器无法找到到 api.twitter.com 的路由

5 分钟前，我的服务器无法找到通往 api.twitter.com 的路由。mtr显示空白屏幕。/etc/init.d/networking restart问题已修复，但我想了解问题出在哪里，以便下次更准确地排除故障。有什么想法吗？

更新：这是主机命令shows：

host api.twitter.com
api.twitter.com has address 199.16.156.199
api.twitter.com has address 199.16.156.40
api.twitter.com has address 199.16.156.104

刷新缓存后，一条路线发生变化：

host api.twitter.com
api.twitter.com has address 199.16.156.40
api.twitter.com has address 199.16.156.104
api.twitter.com has address 199.16.156.231

答案1

如你所见，api.twitter.com 有多个 A 记录

# host api.twitter.com 216.187.125.130
Using domain server:
Name: 216.187.125.130
Address: 216.187.125.130#53
Aliases:

api.twitter.com has address 199.59.150.9
api.twitter.com has address 199.59.149.199
api.twitter.com has address 199.59.149.232

# host api.twitter.com 8.8.8.8
Using domain server:
Name: 8.8.8.8
Address: 8.8.8.8#53
Aliases:

api.twitter.com has address 199.16.156.199
api.twitter.com has address 199.16.156.72
api.twitter.com has address 199.16.156.231

因此，有可能“集群”中的一个节点发生故障，所有数据包都试图到达故障节点。如您所见，每条路由都有 TTL

# ip ro get 199.59.150.9
199.59.150.9 via 209.15.xxx.xxx dev em1  src 209.15.xxx.xxx
    cache  mtu 1500 advmss 1460 hoplimit 64

# ip -s route show cache 199.16.156.231
199.59.150.9 via 209.15.xxx.xxx dev em1  src 192.168.207.10
    cache  users 1 used 38 age 17sec ipid 0x7f34 mtu 1500 advmss 1460 hoplimit 64
199.59.150.9 from 209.15.xxx.xxx via 209.15.xxx.xxx dev em1
    cache  users 1 age 20sec mtu 1500 advmss 1460 hoplimit 64

我认为您可以使用以下命令来清理缓存

# ip route flush cache 199.59.150.9

您可以在以下位置获取更多信息http://vincent.bernat.im/en/blog/2011-ipv4-route-cache-linux.html

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