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Re: Some questions about LAN

 

Tarik Alj wrote:

Please see chapter 13 of the notes and documenetation.
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> Date: Thu, 14 Oct 1999 15:33:39 +0900
> From: Kisoon Sung <[email protected]>
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> To: ns users <[email protected]>
> Subject: Some questions about LAN
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>
> Hi, all!!
>
> I have some questions about LAN in ns.
>
> 1. Maybe the link in ns LAN is half-duplex, is it OK?
What do you mean? nodes in a LAN are connected throught a channel, wich is a
shared segment. There is no "real" link (they are called Vlinks), they are used
to represent connectivity between nodes in the LAN.
 
Thank you your reply..
But yes, I know... My question means two nodes don't send packet at the same time because
LAN in ns is shared media, i.e if two nodes transmit packet collision occured..
>
> 2. And I made LAN. There are 8 node and two of them are source node.
>     I attached tcp and ftp at each source node and I scheduled that
> collision occured.
>     Source nodes transmit packet and sink node transmit ack and nack.
>     But I can't observe when collision occured,
>     when node retransmitted packets, when node transmitted ack and
> nack..
>     How can I observe them?
Are you using Mac or Mac/802_3? Mac/Csma/Cd is not supported anymore.
 
Yes, I used Mac/802_3... I see the flow of packet, ack and nack in graphic.
That I can't observe is exact time table.. When (What time) node retransmitted packets,
when node transmitted ack and nack.. I think the function of Monitor help that probably..

Please reply again...
Good bye!!

>
> 3. This is very  very important for me...
>     I must make star LAN, 10BaseT... Does ns support it? Or should I
> program it?

>
>
>
> --
> ****************************
> Chungnam national University
> Computer Communications Lab.
> Kisoon Sung
> [email protected]
> +82-42-821-7792
> ****************************
>

Tarik Alj
INRS-Telecommunications
16 place du commerce
Verdun (Ile des Soeurs), Qc, H3E 1H6
Canada
Tel: 514 761 8611
Fax: 514 761 8619

--
****************************
Chungnam national University
Computer Communications Lab.
Kisoon Sung
[email protected]
+82-42-821-7792
****************************