ping 時來自本地主機的響應非常慢

網路在我的 Gentoo 機器上執行良好。建立了一個連接，一切正常，速度正常。但是喚醒很慢；啟動連接需要時間。即使 ping 本地主機也需要很長時間（大約 5 秒）。

任何想法如何使這個快速？

一些命令的輸出：

ifconfig 
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
   inet 10.107.105.13  netmask 255.255.240.0  broadcast 10.107.111.255
   inet6 fe80::e269:95ff:fe24:8d3a  prefixlen 64  scopeid 0x20<link>
   ether e0:69:95:24:8d:3a  txqueuelen 1000  (Ethernet)
   RX packets 1071380  bytes 978317595 (932.9 MiB)
   RX errors 0  dropped 1979  overruns 0  frame 0
   TX packets 310432  bytes 30846997 (29.4 MiB)
   TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
   device interrupt 20  memory 0xfe400000-fe420000  

ping -c 5 localhost
PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from Calvin (127.0.0.1): icmp_seq=1 ttl=64 time=0.017 ms
64 bytes from Calvin (127.0.0.1): icmp_seq=2 ttl=64 time=0.029 ms
64 bytes from Calvin (127.0.0.1): icmp_seq=3 ttl=64 time=0.031 ms
64 bytes from Calvin (127.0.0.1): icmp_seq=4 ttl=64 time=0.030 ms
64 bytes from Calvin (127.0.0.1): icmp_seq=5 ttl=64 time=0.033 ms

--- localhost ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3999ms
rtt min/avg/max/mdev = 0.017/0.028/0.033/0.005 ms

ping -c 5 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.018 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.021 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.034 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.031 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.033 ms

--- 127.0.0.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3998ms
rtt min/avg/max/mdev = 0.018/0.027/0.034/0.008 ms

由於localhost和127.0.0.1正在給出不同的響應時間，這是一個名稱解析問題。檢查/etc/resolv.conf以確保它包含您的名稱伺服器的正確地址。如果您不確定正確的地址，您可以嘗試

名稱伺服器 8.8.8.8
名稱伺服器 8.8.4.4

localhost無法從 in 中的條目解析有點奇怪/etc/hosts，因此您可能需要檢查它是否包含看起來像這樣的行

127.0.0.1 本地主機

引用自：https://unix.stackexchange.com/questions/68296