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I'd like to have ANY info on that subject, even if
it's non-complete.
The real tournament is starting saterday
morning
I got 1 night to understand + doing it. lol.
This IS a challenge.
----- Original Message -----
Sent: Friday, October 26, 2001 2:26
AM
Subject: Re: [hlds_linux] World Cyber
Game - FR - Relaying HLTV this weekend
On 25/10/2001, 14:49:26, "Eric Craeymeersch" <[EMAIL PROTECTED]> wrote
regarding Re:
[hlds_linux] World Cyber Game - FR - Relaying HLTV this
weekend:
>
damn, how do you do that ? Not sure multicast can go through our
>
provider...? or tunneling go around this pb ?
Ya, that's the whole
point of multicast tunneling. Lots
of ISPs don't support multicast
routing, so the creators
of multicast built tunneling into the idea right
from
square one. Hell, at the creation of MBONE, no ISPs
supported
multicast (obviously) and the creators weren't
directly connected, so they
had to have this tunneling
concept even to experiment with the
stuff.
There's this beast running around the net called the
MBONE:
multicast backbone. That's a network of hosts that are
all
on multicast-capable networks, and call all reach each
other. It
pretty much spans the world, but it isn't at
every ISP. So all you
have to do is tunnel out to a segment
of the MBONE that's near you, and
away you go.
There are multiple levels of support for multicast: level
1
hosts have to accept multicast packets, but they don't have
to
understand them. Most machines are level 1 at least.
Level 2 hosts
actually handle multicast and can generate
their own packets and do
multicast routing. Linux boxen
can become level 2 hosts if your
ethernet card supports
multicast (some don't), you compile your kernel
with
multicast support (redhat's kernels have that by default,
I think),
you use the iproute2 utilities, and you install
a copy of mrouted.
Once you get all that going, you're
away and happy. This process is
what my tutorial is
all about: getting all the tools, configuring and
compiling
them, and diagnosing certain types of multicast troubles,
like
firewall config and stuff.
I don't know much about Windows' support for
multicast.
It seems to do ok in my experimenting. It cant route
the
stuff, but at least it can generate multicast packets and
handle the
ones bound directly for it. Otherwise the whole
concept of the
multicast HLTV would be fundamentally broken.
:) Anyway, the major
problem is that most consumer-level
ISPs don't support multicast, so you
have to do tunneling
to use it if you're behind one of them. And I
have no clue
if Windows supports multicast tunneling. Luckily,
that's
not an issue if you have a Linux firewall/router in front of
the
windows box, because it can be made to do the tunneling
to MBONE on behalf
of the Windows boxen.
(note: before September, I knew very little about
multicast.
Nearly everything I know now, I've learned by studying
since
then specifically so that I could support HLTV multicast.
So it's
not a particular hard or twisted subject, it's just
a little difficult to
actually find good information on it.
However, I'm by no means done
studying the subject. That's
one reason I'm writing this HLTV
tutorial: so I can test and
debug my own
knowledge.)
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