Match host *.compute.amazonaws.com
  StrictHostKeyChecking no
  UserKnownHostsFile ~/.ssh/known_hosts_aws
  VerifyHostKeyDNS no

Match exec "nslookup %n | grep .compute.amazonaws.com"
  StrictHostKeyChecking no
  UserKnownHostsFile ~/.ssh/known_hosts_aws
  VerifyHostKeyDNS no

Host github.com
  CheckHostIP no

Host heroku.com
  CheckHostIP no
  KexAlgorithms diffie-hellman-group1-sha1
  MACs hmac-sha1

# Usage:
# - ssh host1+host2
# - ssh user1%host1+host2 -l user2
# - ssh host1:port1+host2
# - scp filename host1+host2:~/
# - ssh host1+host2+host3
Host *+*
  ProxyCommand ssh $(echo %h | sed 's/+[^+]*$//;s/\([^+%%]*\)%%\([^+]*\)$/\2 -l \1/;s/:/ -p /') nc -w10 $(echo %h | sed 's/^.*+//;/:/!s/$/ %p/;s/:/ /')

Host *
  CheckHostIP yes
  Compression yes
  HostKeyAlgorithms ssh-ed25519-cert-v01@openssh.com,ssh-ed25519,ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa,ssh-dss
  KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1
  MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512
  Protocol 2
  SendEnv LANG LC_*
  ServerAliveInterval 10
  StrictHostKeyChecking ask
  VerifyHostKeyDNS yes