我想将我的笔记本电脑连接到运行 ssh 服务器的路由器，该服务器的192.168.0.1以太网接口上的静态 IP 地址为。我以前可以这样做，但现在出于某种原因，它显示ssh: connect to host 192.168.0.1 port 22: No route to host。以前我可以连接到服务器，我的笔记本电脑获取 IP 地址的方式是Automatic (DHCP)，但现在它无法连接Automatic。我将笔记本电脑的 IP 设置为静态192.168.0.66。以下是命令的输出route：（以太网接口是enp3s0f1）
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default rtr-35-12-211-1 0.0.0.0 UG 600 0 0 wlp4s0
roswell.egr.msu rtr-35-12-211-1 255.255.255.255 UGH 600 0 0 wlp4s0
35.12.211.0 * 255.255.255.0 U 600 0 0 wlp4s0
link-local * 255.255.0.0 U 1000 0 0 enp3s0f1
192.168.0.0 * 255.255.255.0 U 100 0 0 enp3s0f1
以下是 的输出ifconfig：
enp3s0f1 Link encap:Ethernet HWaddr X:X:X:X:cb:2b
inet addr:192.168.0.66 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::1c11:5c64:f2dd:91b6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:984 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:142942 (142.9 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:3960 errors:0 dropped:0 overruns:0 frame:0
TX packets:3960 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:379355 (379.3 KB) TX bytes:379355 (379.3 KB)
wlp4s0 Link encap:Ethernet HWaddr X:X:X:X:7a:0d
inet addr:35.12.211.223 Bcast:35.12.211.255 Mask:255.255.255.0
inet6 addr: fe80::280b:9f10:ce0d:7d94/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:300950 errors:0 dropped:0 overruns:0 frame:0
TX packets:58621 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:321081707 (321.0 MB) TX bytes:10520862 (10.5 MB)
我无法 ping 通服务器。我无法 ssh 我的 IP 地址和环回 (显示port 22: Connection refused)。
编辑：这是我的 ssh 配置文件：
# This is the ssh client system-wide configuration file. See
# ssh_config(5) for more information. This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.
# Configuration data is parsed as follows:
# 1. command line options
# 2. user-specific file
# 3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.
# Site-wide defaults for some commonly used options. For a comprehensive
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.
Host *
# ForwardAgent no
# ForwardX11 no
# ForwardX11Trusted yes
# RhostsRSAAuthentication no
# RSAAuthentication yes
# PasswordAuthentication yes
# HostbasedAuthentication no
# GSSAPIAuthentication no
# GSSAPIDelegateCredentials no
# GSSAPIKeyExchange no
# GSSAPITrustDNS no
# BatchMode no
# CheckHostIP yes
# AddressFamily any
# ConnectTimeout 0
# StrictHostKeyChecking ask
# IdentityFile ~/.ssh/identity
# IdentityFile ~/.ssh/id_rsa
# IdentityFile ~/.ssh/id_dsa
# IdentityFile ~/.ssh/id_ecdsa
# IdentityFile ~/.ssh/id_ed25519
# Port 22
# Protocol 2
# Cipher 3des
# Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
# MACs hmac-md5,hmac-sha1,[email protected],hmac-ripemd160
# EscapeChar ~
# Tunnel no
# TunnelDevice any:any
# PermitLocalCommand no
# VisualHostKey no
# ProxyCommand ssh -q -W %h:%p gateway.example.com
# RekeyLimit 1G 1h
SendEnv LANG LC_*
HashKnownHosts yes
GSSAPIAuthentication yes
GSSAPIDelegateCredentials no
答案1
我猜测切换到非自动 DHCP 模式后您的网络设置不正确。
您的路线表显示：
default rtr-35-12-211-1 0.0.0.0 UG 600 0 0 wlp4s0
这意味着你的默认路由是通过 WiFi 接口设置的。这将使您的以太网数据包被路由到 35.12.211.0/24 网络，从而使您的目标 SSH 服务器无法访问。