[OpenAFS-devel] nat mode

[Jeffrey Altman]

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Jim Rees wrote:
> Here is an old patch I did for adding "nat mode" to openafs.  I never put
> this in cvs because
> 
> 1) it's part of disconnected afs, and might not be the best way to do this
> 2) nat offends me, and increasing network traffic to compensate for lack of
>    connectivity offends me

With the code that is in the 1.4.1-rc7 file server, this type of patch
should no longer be required provided that the client supports UUIDs.
For 1.4.0 code was added to the file server to track clients by UUIDs.
Unfortunately there was a bug in the code in which the UUID probe was
being sent to the wrong connection.  As a result, the NAT detection code
was never triggered.

In 1.4.1-rc7, clients are now tracked by both IP address and port
number.  When a new connection is established the client is asked for
its UUID.  If the only thing that has changed is the port number, the
data structures are updated, any outstanding callbacks breaks are sent,
and the client goes on its merry way.

There is still a benefit to maintaining the NAT port mapping but it is
no longer required.  If the port mapping is maintained, then callback
breaks can occur immediately and the user will always see current data.
If the NAT port mapping is lost, then the client will only see current
data after it next contacts the file server either via a Ping (GetTime
or GetCapabilities) or in order to do real work.

The UNIX/Linux clients already ping the servers every ten minutes.  The
Windows clients as of 1.4.1-rc5 do so as well.

Jeffrey Altman


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