My .ssh/config

Host [hostname1] [hostname2] [hostname3]
    ProxyCommand ssh [hostname] /usr/local/bin/nc -w 5 %h %p
 
Host [hostname1] [hostname2] [hostname3] 
    Compression yes
 
# defaults
Host *
    Protocol 2,1
    PubkeyAuthentication yes
    RSAAuthentication yes
    PasswordAuthentication yes
    PreferredAuthentications publickey,password,keyboard-interactive
    ForwardAgent yes
    ForwardX11 no
    ServerAliveCountMax 3
    ServerAliveInterval 600
 
Host [hostname]
HostName [ip address]
    Port [port number]
    User [username]