example ssh config file used to create multiple host and assign different ssh keys
### default for all ##
Host *
ForwardAgent no
ForwardX11 no
ForwardX11Trusted yes
User nixcraft
Port 22
Protocol 2
ServerAliveInterval 60
ServerAliveCountMax 30
## override as per host ##
Host server1
HostName server1.cyberciti.biz
User nixcraft
Port 4242
IdentityFile /nfs/shared/users/nixcraft/keys/server1/id_rsa
## Home nas server ##
Host nas01
HostName 192.168.1.100
User root
IdentityFile ~/.ssh/nas01.key
## Login AWS Cloud ##
Host aws.apache
HostName 1.2.3.4
User wwwdata
IdentityFile ~/.ssh/aws.apache.key
## Login to internal lan server at 192.168.0.251 via our public uk office ssh based gateway using ##
## $ ssh uk.gw.lan ##
Host uk.gw.lan uk.lan
HostName 192.168.0.251
User nixcraft
ProxyCommand ssh nixcraft@gateway.uk.cyberciti.biz nc %h %p 2> /dev/null
## Our Us Proxy Server ##
## Forward all local port 3128 traffic to port 3128 on the remote vps1.cyberciti.biz server ##
## $ ssh -f -N proxyus ##
Host proxyus
HostName vps1.cyberciti.biz
User breakfree
IdentityFile ~/.ssh/vps1.cyberciti.biz.key
LocalForward 3128 127.0.0.1:3128