<pre>
GSSAPIAuthentication no
ForwardAgent yes
EscapeChar none
ForwardX11 yes
Protocol 2

Host hometunnel
	User homeuser
	Hostname mymachine.dynamicdns.org
	LocalForward 8080 192.168.1.100:80
        Port 1234

Host home
	User homeuser
	Hostname mymachine.dynamicdns.org
        Port 1234

Host work
	User workuser
	Hostname mywork.mycompany.com
        IdentityFile ~/.ssh/work_id_dsa.pub

Host isp
        User ispuser
        Hostname isp.example.com
        IdentityFile ~/.ssh/isp_id_dsa.pub
</pre>
 