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For clarity in the description of usecase for ssh. #276

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For clarity in the description of usecase for ssh. #276

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11 changes: 5 additions & 6 deletions sysadmin_tools.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -87,11 +87,10 @@ otherwise be one.
Single port on foreign machine firewalled
-----------------------------------------
For this usecase, consider a loadbalancer--``lb-foo-1``--with a Web management
interface listening on port 9090. This interface is only routable to a LAN
private to the datacenter--10.10.10.0/24. Its IP address is 10.10.10.20. There
is a machine on the 10.10.10.0/24 network with ssh access--``jumphost-foo-1``,
accessible via DNS with the LAN IP 10.10.10.19. Therefore, one way to
access ``lb-foo-1`` is via bouncing through ``jumphost-foo-1``. OpenSSH
interface listening on port 9090, it's IP address is 10.10.10.20. This interface is only
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it's should be its.

routable to a LAN private to the datacenter--10.10.10.0/24. Suppose there is a machine
on the 10.10.10.0/24 network with ssh access--``jumphost-foo-1``, accessible via DNS with the LAN IP 10.10.10.19.
Therefore, one way to access ``lb-foo-1`` is via bouncing through ``jumphost-foo-1``. OpenSSH
supplies the ``-L`` option to bind a local port to a port opened on the
other side of the tunnel. On the remote end, ssh opens a connection to
the host and port specified to the ``-L`` option. An example for this
Expand Down Expand Up @@ -180,7 +179,7 @@ There are however two limitations to working this way:
#. You'll often need to be connected to more than one remote system at a time.
Opening a whole new terminal each time can result in a lot of windows cluttering
up precious screen space.
#. What happens if your internet connection stops working? All of your
#. When happens if your internet connection stops working? All of your
connections are reset. Any work you might have been doing on the remote servers
can be lost.

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