Re: Mailslot packets

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#2909

From: Peter Str�mberg
Date: Thu, 02 Nov 2006 10:53

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"Tumurbaatar S." <spam_tumur@magicnet.mn> wrote in
news:45497a1a@newsgroups.borland.com: 

> My app uses Win32 API Mailslots to broadcast packets between 4-5 pc's
> connected to 10Mb HUB.
> With this old HUB there was no problem on delivering packets to
> destination pc. Because mailslot
> datagrams are not reliable,  my app writes 3 packets to mailslot with
> 100 msec interval. And at least
> one of these 3 packets was able to reach to the destination.
> Now I changed the old HUB with new Giga SWITCH (and all connected
> pc's).

Hubs are dumb, they don't know what is attached where, so when a packet 
comes in it is always sent out to all ports.

Switches are smart, they "know" what addresses are on which port, so if a 
packet comes in that doesn't match any destination it will be dropped by 
the switch, unless it is explicitly to an broadcast address.

Also, mailslot packets only uses UDP/broadcasts if the message is less 
than 425 bytes.

Technical Details

Message-ID: <Xns986F832B3A804wilfriedspamcopnet@207.105.83.66>

Path:

arc1-ca.pugleaf.net!g2news2.google.com!news4.google.com!news1.google.com!news3.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail

References: <45497a1a@newsgroups.borland.com>

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Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Re: Mailslot packets
From: "Peter Str�mberg" <wilfried@spamcop.net>
References: <45497a1a@newsgroups.borland.com>
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Date: 2 Nov 2006 03:53:39 -0700
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