Our data system shares data with other systems through UDP broadcast.
With support for multicast in TCP 5 for QNX 4, I was going to give it a try.
Is multicast the same as UDP or are there some major differences?
Is multicast a reliable delivery protocol?
TIA
Augie
Multicast uses UDP and is not reliable. In these respects, it is just like
broadcast but it is more controlled and safer. We use it in our systems under
TCP 5. BTW, QSSL, is TCP 5 officially released now?
Augie Henriques wrote:
Our data system shares data with other systems through UDP broadcast.
With support for multicast in TCP 5 for QNX 4, I was going to give it a try.
Is multicast the same as UDP or are there some major differences?
Is multicast a reliable delivery protocol?
TIA
Augie
On Thu, 12 Apr 2001 09:56:03 -0400, “Augie Henriques”
<augiehenriques@hotmail.com> wrote:
Our data system shares data with other systems through UDP broadcast.
With support for multicast in TCP 5 for QNX 4, I was going to give it a try.
Is multicast the same as UDP or are there some major differences?
It’s the same
Is multicast a reliable delivery protocol?
No, just like UDP.
TIA
Augie
“Mario Charest” <mcharest@nozinformatic.com> wrote in message
news:3ad5ca6f.3879598@inn.qnx.com…
On Thu, 12 Apr 2001 09:56:03 -0400, “Augie Henriques”
augiehenriques@hotmail.com> > wrote:Our data system shares data with other systems through UDP broadcast.
With support for multicast in TCP 5 for QNX 4, I was going to give it a
try.Is multicast the same as UDP or are there some major differences?
It’s the sameIs multicast a reliable delivery protocol?
No, just like UDP.
Is UDP faster?
Augie
TIA
Augie
On Thu, 12 Apr 2001 11:57:34 -0400, “Augie Henriques”
<augiehenriques@hotmail.com> wrote:
“Mario Charest” <> mcharest@nozinformatic.com> > wrote in message
news:> 3ad5ca6f.3879598@inn.qnx.com> …
On Thu, 12 Apr 2001 09:56:03 -0400, “Augie Henriques”
augiehenriques@hotmail.com> > wrote:Our data system shares data with other systems through UDP broadcast.
With support for multicast in TCP 5 for QNX 4, I was going to give it a
try.Is multicast the same as UDP or are there some major differences?
It’s the sameIs multicast a reliable delivery protocol?
No, just like UDP.Is UDP faster?
On a one on one connection perhaps, but the difference
is probably very small. But my understand of multicast
to send data to multiple destination in one shot. Hence
sending multicast data to two machines is faster then
sending the same data twice using UDP 
Multicast requires a litlle more work at connection time, but
once the connection is establlish and membership is setup
I imagine it close to UDP.
Note that the hardware must support this feature. Each
driver must be started with the multicast option.
Augie
TIAAugie
\
“Mario Charest” <mcharest@nozinformatic.com> wrote in message
news:3ad5d497.6479476@inn.qnx.com…
On Thu, 12 Apr 2001 11:57:34 -0400, “Augie Henriques”
augiehenriques@hotmail.com> > wrote:
“Mario Charest” <> mcharest@nozinformatic.com> > wrote in message
news:> 3ad5ca6f.3879598@inn.qnx.com> …
On Thu, 12 Apr 2001 09:56:03 -0400, “Augie Henriques”
augiehenriques@hotmail.com> > wrote:Our data system shares data with other systems through UDP broadcast.
With support for multicast in TCP 5 for QNX 4, I was going to give it
a
try.Is multicast the same as UDP or are there some major differences?
It’s the sameIs multicast a reliable delivery protocol?
No, just like UDP.Is UDP faster?
On a one on one connection perhaps, but the difference
is probably very small. But my understand of multicast
to send data to multiple destination in one shot. Hence
sending multicast data to two machines is faster then
sending the same data twice using UDP >
I have done UDP, you only send once, any machine reading from the socket can
get the data.
It looks like there are no real advantages of going with multicast over udp,
in our case.
TIA
Augie
Multicast requires a litlle more work at connection time, but
once the connection is establlish and membership is setup
I imagine it close to UDP.Note that the hardware must support this feature. Each
driver must be started with the multicast option.Augie
TIAAugie
\
On Thu, 12 Apr 2001 13:11:59 -0400, “Augie Henriques”
<augiehenriques@hotmail.com> wrote:
On a one on one connection perhaps, but the difference
is probably very small. But my understand of multicast
to send data to multiple destination in one shot. Hence
sending multicast data to two machines is faster then
sending the same data twice using UDP >I have done UDP, you only send once, any machine reading from the socket can
get the data.
That’s broadcast, which mean it gets received by everybody (that means
the hardware and the stack) and is usually not routable.
It looks like there are no real advantages of going with multicast over udp,
in our case.
Multicast stream can be received by group and with
the right equipment is routable (which if very important if you
which to reduce traffic)
TIA
Augie
Multicast requires a litlle more work at connection time, but
once the connection is establlish and membership is setup
I imagine it close to UDP.Note that the hardware must support this feature. Each
driver must be started with the multicast option.Augie
TIAAugie
\