jumphost.txt

In some environments it’s necessary to hop through 1 or even 2
gateways to reach the hosts.

In order to make this a little easier and also allow easy scp file
transfers here is a little guide for setting up ssh access.

Add the following to your ~/.ssh/config file

Host *
TCPKeepAlive yes
ServerAliveInterval 20
ServerAliveCountMax 10000
IdentityFile ~/.ssh/id_*
#ForwardAgent yes
#PermitLocalCommand yes
#LocalCommand ~/scripts/ssh_hostname.sh %h
controlmaster auto
controlpath /tmp/ssh-%r@%h:%p
SendEnv LANG LC_*
 
# Jump Host
Host jumphost
Hostname {jumphost ip}
IdentityFile ~/.ssh/id-jumphost-rsa
User {usernmame}
GSSAPIAuthentication no
TCPKeepAlive yes
ForwardAgent yes
 
# Hop to server 1
Host destination-1
Hostname {destination ip}
ProxyCommand ssh jumphost nc %h %p
User {username}
ForwardAgent no

# Hop to server 2
Host destination-2
Hostname {destination ip}
ProxyCommand ssh jumphost nc %h %p
User {username}
ForwardAgent no
 
If everything went well you can now connect to servers that require a connection thru the jumphost:

ssh destination-1