Host *
  ForwardAgent yes

Host reverseproxy
  Hostname 189.9.151.16
  User spb

Host database
  Hostname 10.18.0.16
  User spb
  # connect via reverseproxy host
  ProxyCommand ssh spb@189.9.151.16 nc %h %p

Host social
  Hostname 10.18.0.17
  User spb
  # connect via reverseproxy host
  ProxyCommand ssh spb@189.9.151.16 nc %h %p

Host email
  Hostname 10.18.0.18
  User spb
  # connect via reverseproxy host
  ProxyCommand ssh spb@189.9.151.16 nc %h %p

Host integration
  Hostname 10.18.0.19
  User spb
  # connect via reverseproxy host
  ProxyCommand ssh spb@189.9.151.16 nc %h %p