刘耀文

Configuration Template#

# Basic Configuration: Define alias and default authentication method
Host custom-alias
    User your-username
    PreferredAuthentications publickey
    IdentityFile "path/to/your/private_key"

# Internal Network Routing: Check internal network reachability via ping
Match host custom-alias exec "ping -n 1 -w 100 internal.ip >nul 2>&1"
    HostName internal.ip
    Port internal_port

# External Network Routing: Alternative when the internal network is unreachable
Match host custom-alias
    HostName external.ip
    Port external_port

Usage Steps#

1. Replace Configuration Items

   • custom-alias: Set a memorable alias
   • your-username: Replace with your login username
   • path/to/your/private_key: Replace with the path to your private key file
   • internal.ip: Replace with the internal IP
   • internal_port: Replace with the internal port
   • external.ip: Replace with the external IP
   • external_port: Replace with the external port

2. Connection Command

ssh custom-alias

How It Works#

1. The SSH client receives a connection request for custom-alias
2. Checks Match conditions in order:
   • First, execute the ping command to check internal network connectivity
   • If the internal network is reachable, use the internal configuration
   • If the internal network is unreachable, use the external configuration
3. Connect using the corresponding configuration

Notes#

• Windows system paths use backslashes \
• Linux/Mac system paths use forward slashes /
• Ping command parameters:
  • Windows: ping -n 1 -w 100
  • Linux/Mac: ping -c 1 -W 1
• Ensure the configuration file permissions are correct (Linux/Mac recommends 600)

This document is synchronized and updated to xLog by Mix Space
The original link is https://liuyaowen.cn/posts/default/202501021