ARP 表中的 one.one.one.one 条目

ARP 表中的 one.one.one.one 条目

我为 esnp4s0f0 接口添加了一个 IP 地址 1.1.1.2/24。并向 1.1.1.1 发送 ping

为什么 arp 表显示为一一一一而不是简单的 1.1.1.1??

root@testbed:~# arp
Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.10.225           ether   00:0c:29:bc:3e:68   C                     eno3
10.250.0.4               ether   52:54:00:4d:7e:fe   C                     br1
one.one.one.one          ether   02:10:18:cc:9e:6c   C                     enp4s0f0

我不记得添加过某种 DNS 条目。

答案1

您没有输入 DNS 条目并不重要,因为您使用的是公共 IP 地址,而不是保留的私有 IP 地址。您的 arp 命令正在执行 DNS 查找并获取 IP 地址的实际答案。如果您想抑制 DNS 查找,请执行arp -n

例子:

doug@DOUG-64:~$ nslookup one.one.one.one
Server:         127.0.0.1
Address:        127.0.0.1#53

Non-authoritative answer:
Name:   one.one.one.one
Address: 1.1.1.1
Name:   one.one.one.one
Address: 1.0.0.1

doug@DOUG-64:~$
doug@DOUG-64:~$ nslookup 1.1.1.1
Server:         127.0.0.1
Address:        127.0.0.1#53

Non-authoritative answer:
1.1.1.1.in-addr.arpa    name = one.one.one.one.

Authoritative answers can be found from:
1.1.1.in-addr.arpa      nameserver = ns3.cloudflare.com.
1.1.1.in-addr.arpa      nameserver = ns7.cloudflare.com.
ns3.cloudflare.com      internet address = 162.159.7.226
ns3.cloudflare.com      internet address = 162.159.0.33
ns3.cloudflare.com      has AAAA address 2400:cb00:2049:1::a29f:21
ns3.cloudflare.com      has AAAA address 2400:cb00:2049:1::a29f:7e2
ns7.cloudflare.com      internet address = 162.159.6.6
ns7.cloudflare.com      internet address = 162.159.4.8
ns7.cloudflare.com      has AAAA address 2400:cb00:2049:1::a29f:408
ns7.cloudflare.com      has AAAA address 2400:cb00:2049:1::a29f:606

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