/etc/ssh/ssh config

Man page: https://man7.org/linux/man-pages/man5/ssh_config.5.html

• ~/.ssh/config
• /etc/ssh/ssh_config

Basic example

Host your_machine_name
    Hostname IP_or_dns_name
    User USERNAME_TO_CONNECT
    IdentityFile ~/.ssh/id_ed25519

Complete example

Host machine_name_for_ssh_client
    ProxyJump YOUR_SERVER_TO_USE_AS_JUMPSERVER
    Hostname (IP or hostname)
    Port 22
    User USERNAME_TO_CONNECT
    IdentityFile ~/.ssh/id_ed25519

Configure OpenSSH to reuse ssh connections

ControlMaster auto
ControlPath ~/.ssh/sockets/%r@%h-%p
ControlPersist 36000

OpenSSH Changelog

• 2016 OpenSSH 7.3 include include.d/your_file

To allow connection to some Cisco IOS devices:

• KexAlgorithms +diffie-hellman-group14-sha1

Related terms

• Default usernames
• HashKnownHosts
• .pg_service.conf
• StrictHostKeyChecking

See also

• SSH: ssh, TLS, .ppk, .pem, .crt, .pub, ED25519, Key exchange method (KEX), public key, private key, ssh -Q kex, IAMUserSSHKeys, known_hosts, ssh tunnel, Dropbear, ssh -o, ~/.ssh/config
• OpenSSH (changelog): /etc/ssh/sshd_config | /etc/ssh/ssh_config | ~/.ssh/ | openSSL | sshd logs | sftp | scp | authorized_keys | ssh-keygen | ssh-keyscan | ssh-add | ssh-agent | ssh | Ssh -O stop | ssh-copy-id | CheckHostIP | UseKeychain, OpenSSF, ~/.ssh/authorized_keys