[tg] Regarding the many to one traffic flow

Wed, 8 Jan 2003 18:31:19 -0800 (PST)

Hi, 

The on-wire format of the packets are as follows: 

UDP:
  IP HDR : UDP HDR : SEQ NO : DATA 

TCP: 
  IP HDR : TCP HDR : DATA 

tg is like any other application on top of sockets. While sending
packets over UDP, tg adds a sequence number (4 bytes wide) to detect
losses. 

Venkata 

On Thu, 9 Jan 2003, sachin wrote:
> Can you please give the packet format (header) for both UDP and TCP?
> ----- Original Message -----
> From: "Barbara Denny" <b_a_denny@yahoo.com>
> To: "sachin" <sachinls@netsys.kaist.ac.kr>; "Venkata Pingali"
> <pingali@ISI.EDU>
> Cc: "Barbara Denny" <b_a_denny@yahoo.com>; <tg@postel.org>
> Sent: Thursday, January 09, 2003 1:15 AM
> Subject: Re: [tg] Regarding the many to one traffic flow
> 
> 
> > Hi,
> >
> > The TCP/UDP you get is dependent on what the operating
> > system supplies.  TG does not do anything special
> > regarding transport protocols unless you have added
> > one of your own to TG. It makes socket calls to the
> > kernel to get whatever support it needs for these
> > protocols.
> >
> > barbara
> > --- sachin <sachinls@netsys.kaist.ac.kr> wrote:
> > > Hi,
> > >
> > > I have two more questions regarding TG.
> > >
> > > 1. To what degree TG can immulate TCP protocol. Will
> > > the traffic be
> > > dependent on congestion of the network for TCP and
> > > will the sndwin be
> > > changed based on the congestion. Is it a closed loop
> > > system that has been
> > > implimented in TG or is it the open loop system
> > > unlike actual TCP?
> > >
> > > 2. Another thing is what is the packet format for
> > > UDP and TCP generated by
> > > TG?
> > >
> > > Sachin
> > >
> > > ----- Original Message -----
> > > From: "Venkata Pingali" <pingali@ISI.EDU>
> > > To: "sachin" <sachinls@netsys.kaist.ac.kr>
> > > Cc: "Barbara Denny" <b_a_denny@yahoo.com>;
> > > <tg@postel.org>
> > > Sent: Wednesday, January 08, 2003 9:45 AM
> > > Subject: Re: [tg] Regarding the many to one traffic
> > > flow
> > >
> > >
> > > > Hi,
> > > >
> > > > I looked at the script, and  looks like the script
> > > will be have to be
> > > > extended to support multiple sources explicitly.
> > > >
> > > > One way to get around the limitation is to use
> > > multiple sinks (i.e., have
> > > > multiple 1-1 connections).
> > > >
> > > > Venkata
> > > >
> > > > On Tue, 7 Jan 2003, sachin wrote:
> > > > > Well, Thank you guys for helping out. Well I
> > > have simulated many to one
> > > > > traffic scenario. Its works as expected and the
> > > log file in sink machine
> > > > > also supports the fact.
> > > > >
> > > > > Now the problem is how can I generate files from
> > > gengraph.pl with many
> > > > > client files and only one source file. If I try
> > > to cross each client
> > > file
> > > > > with the source file then it works with an
> > > warning and i have ill
> > > feeling
> > > > > the file so generated is never a valid one. So
> > > please help me out in
> > > this.
> > > > >
> > > > > Sachin
> > > > > ----- Original Message -----
> > > > > From: "sachin" <sachinls@netsys.kaist.ac.kr>
> > > > > To: "Venkata Pingali" <pingali@ISI.EDU>
> > > > > Cc: "Barbara Denny" <b_a_denny@yahoo.com>;
> > > <tg@postel.org>
> > > > > Sent: Tuesday, January 07, 2003 4:57 PM
> > > > > Subject: Re: [tg] data rate
> > > > >
> > > > >
> > > > > > Thank you,
> > > > > >
> > > > > > I have attached the files. The attachment
> > > contains log and well as
> > > dcat'd
> > > > > > files. I have send log files to get further
> > > information regarding the
> > > use
> > > > > of
> > > > > > gengraph.pl
> > > > > >
> > > > > > I have used one of the source files to get a
> > > stats.xpl (default name).
> > > I
> > > > > > wanted to view this file with the help of
> > > gnuplot and xplot. Well
> > > these
> > > > > > tools are installed in my windows machine. But
> > > non of these can read
> > > the
> > > > > > file format. Can you please tell me where I
> > > went wrong.
> > > > > >
> > > > > > Sachin
> > > > > > ----- Original Message -----
> > > > > > From: "Venkata Pingali" <pingali@ISI.EDU>
> > > > > > To: "sachin" <sachinls@netsys.kaist.ac.kr>
> > > > > > Cc: "Barbara Denny" <b_a_denny@yahoo.com>;
> > > <tg@postel.org>
> > > > > > Sent: Tuesday, January 07, 2003 4:08 PM
> > > > > > Subject: Re: [tg] data rate
> > > > > >
> > > > > >
> > > > > > >
> > > > > > > There is nothing fundamentally stopping one
> > > from running multiple
> > > > > sources
> > > > > > > provided it is within resource limits of the
> > > host. TG can accept
> > > > > multiple
> > > > > > > connections simultaneously. can you please
> > > send me the input tg
> > > files
> > > > > and
> > > > > > > the log file (or its dcat'd output) to my
> > > private email address?  I
> > > will
> > > > > > > see if those files give me a hint.
> > > > > > >
> > > > > > > thanks.
> > > > > > > Venkata
> > > > > > >
> > > > > > > On Tue, 7 Jan 2003, sachin wrote:
> > > > > > > > Thank you.
> > > > > > > >
> > > > > > > > Is it possible to run more than 1 TG
> > > source in a single machine.
> > > Well
> > > > > I
> > > > > > have
> > > > > > > > tried it here. But the sink seems to
> > > accept packets from one
> > > source
> > > > > and
> > > > > > then
> > > > > > > > as this source stops transmitting it goes
> > > for another source. I
> > > have
> > > > > > > > realized this from the log file of the
> > > sink.
> > > > > > > >
> > > > > > > > Well my intention is to generate four
> > > concurrent traffic streams
> > > and
> > > > > > feed
> > > > > > > > them into IXP machine (which will be
> > > working as router) and will
> > > be
> > > > > > using
> > > > > > > > single sink.
> > > > > > > >
> > > > > > > > sachin
> > > > > > > >
> > > > > > > > ----- Original Message -----
> > > > > > > > From: "Barbara Denny"
> > > <b_a_denny@yahoo.com>
> > > > > > > > To: "sachin"
> > > <sachinls@netsys.kaist.ac.kr>; <tg@postel.org>
> > > > > > > > Sent: Tuesday, January 07, 2003 2:47 PM
> > > > > > > > Subject: Re: [tg] data rate
> > > > > > > >
> > > > > > > >
> > > > > > > > > The specification of the interarrival
> > > rate plus
> > > > > > > > > the packet size gives you the data rate.
> > > > > > > > >
> > > > > > > > > barbara
> > > > > > > > >
> > > > > > > > > --- sachin <sachinls@netsys.kaist.ac.kr>
> > > wrote:
> > > > > > > > > > Hi,
> > > > > > > > > >
> > > > > > > > > > I forgot to add one more query in the
> > > last email.
> > > > > > > > > > How can we explicitly give the data
> > > rate for
> > > > > > > > > > transmission. Well if there is no such
> > > provision how
> > > > > > > > > > are we suppose to provide data rate.
> > > > > > > > > >
> > > > > > > > > > Sachin
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > __________________________________________________
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> > > > > > > >
> > > > > > > >
> > > _______________________________________________
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> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > >
> > === message truncated ===
> >
> >
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> 