SSH_Config

Host domain1
        Hostname bastion.domain1.com
        forwardagent yes
        gatewayports yes
        ServerAliveInterval 30
        Compression yes
        CompressionLevel 4
        Port 22

Host domain2
        Hostname bastion.domain2.com
        forwardagent yes
        gatewayports yes
        ServerAliveInterval 30
        Compression yes
        CompressionLevel 4
        Port 22

# This makes SSH automatically proxy over a bastion when the host pattern matches
Host *.domain2.com !*bastion*
    ProxyCommand ssh snambi@bastion.domain2.com -W %h:%p

Host *.domain1.com !*bastion*
    ProxyCommand ssh bastion.domain1.com -W %h:%p

Host ubuntu
    IdentityFile ~/.ssh/aws/aws_keypair.pem
    HostName ubuntu14.04.domain1.com
    User stack
    ProxyCommand ssh -W %h:%p phx

Host *
    StrictHostKeyChecking no
    ControlMaster auto
    ControlPath   ~/.ssh/sockets/ssh-mux-%h_%p_%r
    ControlPersist 600