SSH keeps hanging up...

Andrew Jorgensen andrew at
Thu May 22 12:17:30 MDT 2008

On Thu, 2008-05-22 at 12:06 -0600, Dr. Scott S. Jones wrote:
> What then, about the design of so many routers, causes the connections,
> whether ssh sessions or others to fail?

In order for NAT to work long-term you have to expire mappings that
haven't been used in a while so that you can add new mappings to the
table.  Some probably do this based purely on available memory but most
will expire mappings based on how long it's been since the last packet.
Honestly it would be a better design to use available memory (and ports)
as the indicator for when to expire an older mapping but most just have
a timeout (or very small tables).

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