SSH

SSH client configuration symlinked to ~/.ssh/config.

Location

File	Symlinked to
config/ssh/config	~/.ssh/config

Global host settings (Host *)

Locale

macOS forwards LC_* and LANG variables to remote hosts by default. Remote servers (e.g. Debian) may not have the same locale installed, which causes warning messages on login. This is disabled globally:

SendEnv -LC_* -LANG

Connection multiplexing

Reuses existing SSH connections for faster subsequent logins to the same host.

Setting	Value	Description
ControlMaster	auto	Automatically start multiplexing
ControlPath	~/.ssh/cm-%r@%h:%p	Socket path per user/host/port
ControlPersist	60s	Keep master open 60 s after last session

Keepalive

Prevents idle connections from being dropped by firewalls or routers.

Setting	Value	Description
ServerAliveInterval	60	Send keepalive packet every 60 s
ServerAliveCountMax	3	Disconnect after 3 missed responses

Machine-specific hosts

Add project- or machine-specific host blocks to ~/.ssh/config.local (not tracked by git) and include it with:

Include ~/.ssh/config.local

Or add host entries directly after the Host * block in a local, untracked file.