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Re: [ledbat] list of reasons for needing multiple TCP connections

Stanislav Shalunov <shalunov@shlang.com> Tue, 25 November 2008 23:43 UTC

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From: Stanislav Shalunov <shalunov@shlang.com>
To: Murari Sridharan <muraris@microsoft.com>
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Subject: Re: [ledbat] list of reasons for needing multiple TCP connections
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On Nov 25, 2008, at 1:04 PM, Murari Sridharan wrote:
> [MS] I think most NATs aggressively reuse stale mappings and if your  
> protocol relies on this mapping for connectivity, it would fail, we  
> routinely see this with Teredo where the address/ external port  
> would change unless you keep a periodic bubble to keep the mapping up.

To clarify the context --

"Mostly idle" BitTorrent connections periodically exchange small  
messages (haves and, failing that, keepalives).  They will consume the  
NAT slots, even though they mostly don't matter for other purposes.

This is generally not a problem for the number of connections  
BitTorrent maintains.

--
Stanislav Shalunov



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