General NAT (port forwarding) question

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Doc Wally - 28 Oct 2003 02:16 GMT

Dearest Colleagues:

Okay, so I have myself a Windows 2000 advanced server machine over yonder
and set up Windows Media technologies so that it will stream.

I have a bunch of WMV files that I want to put on it, but (there always has
to be one), can only use one incoming port on my router on account of our
ISP.

So, those of you who have the answers, ante-up. Please share your wisdom as
to setting it up so that the video streams via a specific port, or should I
open up a specific port to make things easier?

Any advice given will be paid back in beer.

Sir-Twitch-A-Lot

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Dave Roth [MS] - 28 Oct 2003 09:14 GMT

You could rely on TCP only MMS or you could rely on HTTP streaming. MMS
would require you open up TCP 1755 where HTTP would require that you open up
TCP port 80.

If you use MMS then the client may end up linking using UDP based MMS (which
requires TCP 1755 for control but uses UDP for data transfer). If your
NAT/Firewall allows outgoing UDP then this would work....until your client
tries to request a packet resend (ie. a packet was lost or dropped). Such
requests are made to server port UDP 1755. If your NAT blocks this then the
client will not recover the packet.

Another thought...HTTP streaming penetrates firewalls since port 80 is
usually opened up for web access.

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Dave Roth [MS]
Program Manager
Digital Media Division
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> Dearest Colleagues:
>
[quoted text clipped - 12 lines]
>
> Sir-Twitch-A-Lot

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