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Re: bridges and routers



Really good documented. Sure.

Thanks for that big explanation.

As i said in the project web page, "interface between IP services and GSM
messaging", so, i thought that a gateway was a good definition.

Anyway, i didn't knew about gateway as a deprecated term. Well, i think it
does not matter a lot.

About bridging, i do not worry about ethernet or gsm stuff, so i think it
has less of bridge and more of "protocol converter" or gateway. I use
other lowlevel programs to use them. Alamin uses TCP in one side and SMS
at the other.

Bye.

El 20 Sep 2001 a las 01:33PM +0200, Martin F Krafft escribio:
> [cc'd back to debian as a request for confirmation/correction]
> 
> Please realize that, at least from my side, this thread is purely for
> informational purposes, and out of interest. i am not trying to make
> life hard for anyone.
> 
> the thread started because Andres calls his alamin.org project a
> gateway, and i said it should be a bridge. we are finding out that
> gateway isn't too wrong...
> 
> also sprach Andres Seco Hernandez (on Thu, 20 Sep 2001 12:33:55AM +0200):
> > I was thinking that a bridge connects same topology networks, no
> > different.
> 
> this is false. bridges operate on the data-link layer (layer 2) of the
> ISO/OSI stack model, as opposed to routers and gateways, which work on
> level 3 (network) and up. Tanenbaum states in "Computer Networks" (3rd
> ed., 1996) that bridges are frequently used to connect remote sites
> with different network technologies, rather than having a coax cable
> (for thinnet) go between them. and in Perlman (1992)
> "Interconnections: Bridges and Routers", he states explicitly that
> "Bridges are the only devices that can connect networks of different
> topologies; e.g. The connection between Token Ring and Ethernet
> networks is a bridge."
> 
> More accurately, this should be "anything that connects two networks
> of different topology is a bridge, or possesses the features of a
> bridge. In fact, a Linux computer can run as a bridge, but not without
> trouble because bridges *do not* go higher than OSI Level 2.
> 
> A router is a simple packet forwarder based on decision/routing
> tables. in its basic definition, it connects networks of same topology
> and protocol, but modern routers or ISDN routers frequently add to
> this by providing a link between PPP encapsulation and ethernet (or
> ATM encapsulation).
> 
> According to http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?gateway, a
> gateway is a deprecated term for a protocol converter, but it also
> applies to your situation, so in the end you are right: "An interface
> between an information source and a World-Wide Web server.  Common
> Gateway Interface is a standard for such interfaces."
> 
> so while Alamin bridges between GSM and Ethernet, it is also an SMS
> and IP gateway, right?
> 
> martin;              (greetings from the heart of the sun.)
>   \____ echo mailto: !#^."<*>"|tr "<*> mailto:"; net@madduck
> -- 
> *** closing link: disconnecting from stoned server.



-- 
Andres Seco Hernandez    -     AndresSH@alamin.org
MCP ID 445900     -     http://andressh.alamin.org
GnuPG public information:      pub  1024D/3A48C934
E61C 08A9 EBC8 12E4 F363  E359 EDAC BE0B 3A48 C934
--------------------------------------------------
Alamin GSM SMS Gateway   -   http://www.alamin.org
Debian GNU/Linux         -   http://www.debian.org
Grupo de Usuarios de GNU/Linux  de  Guadalajara  y
alrededores  -  http://gulalcarria.sourceforge.net
--------------------------------------------------

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