Failure to access anything requiring the lb-bastion.dr.gitlab.com bastion

# Bastion dr environment failures

Examples of successful bastion access to a production redis host, and a failed bastion access to whatever environment `dr` refers to.

## Success connecting to production bastion (lb-bastion.gprd.gitlab.com):

```{sh}
$ ssh -v lb-bastion.gprd.gitlab.com
OpenSSH_7.9p1, LibreSSL 2.7.3
debug1: Reading configuration data /Users/nelsnelson/.ssh/config
debug1: /Users/nelsnelson/.ssh/config line 2: Applying options for lb-bastion.gprd.gitlab.com
debug1: /Users/nelsnelson/.ssh/config line 71: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug1: Connecting to lb-bastion.gprd.gitlab.com port 22.
debug1: Connection established.
debug1: identity file /Users/nelsnelson/.ssh/id_rsa type 0
debug1: identity file /Users/nelsnelson/.ssh/id_rsa-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_dsa type -1
debug1: identity file /Users/nelsnelson/.ssh/id_dsa-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ecdsa type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ecdsa-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ed25519 type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ed25519-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_xmss type -1
debug1: identity file /Users/nelsnelson/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.2p2 Ubuntu-4ubuntu2.8
debug1: match: OpenSSH_7.2p2 Ubuntu-4ubuntu2.8 pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
debug1: Authenticating to lb-bastion.gprd.gitlab.com:22 as 'nelsnelson'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256@libssh.org
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:YjrYlnAlbKv23MI+h4UJGaGU32SWHngXti2ahIEEVz0
debug1: Host 'lb-bastion.gprd.gitlab.com' is known and matches the ECDSA host key.
debug1: Found key in /Users/nelsnelson/.ssh/known_hosts:435
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
debug1: Will attempt key: cardno:000610165365 RSA SHA256:1Nj+VCcO72FXfEeTmrzP+jVE2lS1sT2A3sOx5mwUhCU agent
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_rsa RSA SHA256:9Ev94jGJTsaPi/hiU57atmgVm8AB6PS/akZlxbYVqRw
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_dsa 
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_ecdsa 
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_ed25519 
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_xmss 
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering public key: cardno:000610165365 RSA SHA256:1Nj+VCcO72FXfEeTmrzP+jVE2lS1sT2A3sOx5mwUhCU agent
debug1: Server accepts key: cardno:000610165365 RSA SHA256:1Nj+VCcO72FXfEeTmrzP+jVE2lS1sT2A3sOx5mwUhCU agent
debug1: Authentication succeeded (publickey).
Authenticated to lb-bastion.gprd.gitlab.com ([35.196.168.43]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.10.0-1009-gcp x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  Get cloud support with Ubuntu Advantage Cloud Guest:
    http://www.ubuntu.com/business/services/cloud

128 packages can be updated.
0 updates are security updates.

New release '18.04.2 LTS' available.
Run 'do-release-upgrade' to upgrade to it.


*** System restart required ***
nelsnelson@bastion-02-inf-gprd.c.gitlab-production.internal:~$ exitdebug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow@openssh.com reply 0

logout
debug1: channel 0: free: client-session, nchannels 1
Connection to lb-bastion.gprd.gitlab.com closed.
Transferred: sent 3176, received 4152 bytes, in 3.6 seconds
Bytes per second: sent 876.0, received 1145.2
debug1: Exit status 0

$ ssh -vvv redis-01-db-gprd.c.gitlab-production.internal
OpenSSH_7.9p1, LibreSSL 2.7.3
debug1: Reading configuration data /Users/nelsnelson/.ssh/config
debug1: /Users/nelsnelson/.ssh/config line 7: Applying options for *.gitlab-production.internal
debug1: /Users/nelsnelson/.ssh/config line 71: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug1: Executing proxy command: exec ssh lb-bastion.gprd.gitlab.com -W redis-01-db-gprd.c.gitlab-production.internal:22
debug1: identity file /Users/nelsnelson/.ssh/id_rsa type 0
debug1: identity file /Users/nelsnelson/.ssh/id_rsa-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_dsa type -1
debug1: identity file /Users/nelsnelson/.ssh/id_dsa-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ecdsa type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ecdsa-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ed25519 type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ed25519-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_xmss type -1
debug1: identity file /Users/nelsnelson/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.2p2 Ubuntu-4ubuntu2.8
debug1: match: OpenSSH_7.2p2 Ubuntu-4ubuntu2.8 pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
debug2: fd 5 setting O_NONBLOCK
debug2: fd 4 setting O_NONBLOCK
debug1: Authenticating to redis-01-db-gprd.c.gitlab-production.internal:22 as 'nelsnelson'
debug3: hostkeys_foreach: reading file "/Users/nelsnelson/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/nelsnelson/.ssh/known_hosts:442
debug3: load_hostkeys: loaded 1 keys from redis-01-db-gprd.c.gitlab-production.internal
debug3: order_hostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com
debug2: compression stoc: none,zlib@openssh.com
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug1: kex: algorithm: curve25519-sha256@libssh.org
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:pbwMgpPOhyNzX9LCfxM8d6D2vOV9zBdQOxtBoBIm240
debug3: hostkeys_foreach: reading file "/Users/nelsnelson/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/nelsnelson/.ssh/known_hosts:442
debug3: load_hostkeys: loaded 1 keys from redis-01-db-gprd.c.gitlab-production.internal
debug1: Host 'redis-01-db-gprd.c.gitlab-production.internal' is known and matches the ECDSA host key.
debug1: Found key in /Users/nelsnelson/.ssh/known_hosts:442
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug1: Will attempt key: cardno:000610165365 RSA SHA256:1Nj+VCcO72FXfEeTmrzP+jVE2lS1sT2A3sOx5mwUhCU agent
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_rsa RSA SHA256:9Ev94jGJTsaPi/hiU57atmgVm8AB6PS/akZlxbYVqRw
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_dsa 
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_ecdsa 
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_ed25519 
debug1: Will attempt key: /Users/nelsnelson/.ssh/id_xmss 
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred publickey
debug3: authmethod_lookup publickey
debug3: remaining preferred: 
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: cardno:000610165365 RSA SHA256:1Nj+VCcO72FXfEeTmrzP+jVE2lS1sT2A3sOx5mwUhCU agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: cardno:000610165365 RSA SHA256:1Nj+VCcO72FXfEeTmrzP+jVE2lS1sT2A3sOx5mwUhCU agent
debug3: sign_and_send_pubkey: RSA SHA256:1Nj+VCcO72FXfEeTmrzP+jVE2lS1sT2A3sOx5mwUhCU
debug3: sign_and_send_pubkey: signing using rsa-sha2-512
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to redis-01-db-gprd.c.gitlab-production.internal (via proxy).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting no-more-sessions@openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: proc
debug3: receive packet: type 80
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug1: Sending environment.
debug3: Ignored env SHELL
debug3: Ignored env LSCOLORS
debug3: Ignored env LESS
debug3: Ignored env XPC_FLAGS
debug3: Ignored env TERM_PROGRAM_VERSION
debug3: Ignored env JAVA_HOME
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env SVN_EDITOR
debug3: Ignored env TERM_SESSION_ID
debug3: Ignored env RBENV_SHELL
debug3: Ignored env GPG_TTY
debug3: Ignored env JENV_SHELL
debug3: Ignored env PWD
debug3: Ignored env LOGNAME
debug3: Ignored env MANPATH
debug3: Ignored env VIRTUALENVWRAPPER_VIRTUALENV
debug3: Ignored env HOME
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env SECURITYSESSIONID
debug3: Ignored env PYTHONSTARTUP
debug3: Ignored env TMPDIR
debug3: Ignored env CLICOLOR
debug3: Ignored env VIRTUALENVWRAPPER_VIRTUALENV_ARGS
debug3: Ignored env FIGNORE
debug3: Ignored env TERM
debug3: Ignored env USER
debug3: Ignored env SHLVL
debug3: Ignored env XPC_SERVICE_NAME
debug3: Ignored env Apple_PubSub_Socket_Render
debug3: Ignored env PATH
debug3: Ignored env JENV_LOADED
debug3: Ignored env GOPATH
debug3: Ignored env TERM_PROGRAM
debug3: Ignored env _
debug3: Ignored env __CF_USER_TEXT_ENCODING
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.10.0-1009-gcp x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  Get cloud support with Ubuntu Advantage Cloud Guest:
    http://www.ubuntu.com/business/services/cloud

126 packages can be updated.
0 updates are security updates.


*** System restart required ***
 PRODUCTION REDIS_CHECKCMD_ERROR nelsnelson@redis-01-db-gprd.c.gitlab-production.internal:~$ exit
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype eow@openssh.com reply 0
debug2: channel 0: rcvd eow
debug2: channel 0: chan_shutdown_read (i0 o0 sock -1 wfd 6 efd 8 [write])
debug2: channel 0: input open -> closed
debug3: receive packet: type 96
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug3: receive packet: type 97
debug2: channel 0: rcvd close
debug3: channel 0: will not send data after close
logout
debug3: channel 0: will not send data after close
debug2: channel 0: obuf empty
debug2: channel 0: chan_shutdown_write (i3 o1 sock -1 wfd 7 efd 8 [write])
debug2: channel 0: output drain -> closed
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug3: send packet: type 97
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
  #0 client-session (t4 r0 i3/0 o3/0 e[write]/0 fd -1/-1/8 sock -1 cc -1)

debug3: send packet: type 1
debug3: fd 1 is not O_NONBLOCK
Connection to redis-01-db-gprd.c.gitlab-production.internal closed.
Transferred: sent 3176, received 3608 bytes, in 2.9 seconds
Bytes per second: sent 1112.9, received 1264.3
debug1: Exit status 0
```

## Failure connecting to dr bastion (lb-bastion.dr.gitlab.com):

```{sh}
$ ssh -vvv lb-bastion.dr.gitlab.com
OpenSSH_7.9p1, LibreSSL 2.7.3
debug1: Reading configuration data /Users/nelsnelson/.ssh/config
debug1: /Users/nelsnelson/.ssh/config line 21: Applying options for lb-bastion.dr.gitlab.com
debug1: /Users/nelsnelson/.ssh/config line 72: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug1: Connecting to lb-bastion.dr.gitlab.com port 22.
^C

$ ssh -vvv console-01-sv-dr.c.gitlab-dr.internal
OpenSSH_7.9p1, LibreSSL 2.7.3
debug1: Reading configuration data /Users/nelsnelson/.ssh/config
debug1: /Users/nelsnelson/.ssh/config line 26: Applying options for *.gitlab-dr.internal
debug1: /Users/nelsnelson/.ssh/config line 72: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug1: Executing proxy command: exec ssh lb-bastion.dr.gitlab.com -W console-01-sv-dr.c.gitlab-dr.internal:22
debug1: identity file /Users/nelsnelson/.ssh/id_rsa type 0
debug1: identity file /Users/nelsnelson/.ssh/id_rsa-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_dsa type -1
debug1: identity file /Users/nelsnelson/.ssh/id_dsa-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ecdsa type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ecdsa-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ed25519 type -1
debug1: identity file /Users/nelsnelson/.ssh/id_ed25519-cert type -1
debug1: identity file /Users/nelsnelson/.ssh/id_xmss type -1
debug1: identity file /Users/nelsnelson/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9
^C
```

## Relevent ~/.ssh/config sections:

```{sh}
# GCP production bastion host
Host lb-bastion.gprd.gitlab.com
        PreferredAuthentications        publickey
        User                            nelsnelson

# gprd boxes
Host *.gitlab-production.internal
        PreferredAuthentications        publickey
        ProxyCommand                    ssh lb-bastion.gprd.gitlab.com -W %h:%p

# GCP staging bastion host
Host lb-bastion.dr.gitlab.com
        PreferredAuthentications        publickey
        User                            nelsnelson

# dr boxes
Host *.gitlab-dr.internal
        PreferredAuthentications        publickey
        ProxyCommand                    ssh lb-bastion.dr.gitlab.com -W %h:%p
```

All of the examples have been attempted with solely the four stanzas found in the above `~/.ssh/config` snippet.

Story points: 5.0