[GRLUG] Two topics...multicast and traffic shaping.

[John-Thomas Richards]

On Tue, Jul 12, 2011 at 01:57:38PM -0400, Michael Mol wrote:
> With IPv6 up and working very well at home (6to4), I've got two things
> I want to get working properly on my network, next.
> 
> The first is traffic shaping. With my current connection, I don't
> really face noticeable bandwidth limitations, but it's still something
> I'd like to get straight.
> 
> My thought is, the majority of latency-sensitive traffic is going to
> be on UDP (VOIP, etc), or is going to be on TCP with small packets
> (ssh sessions and the like). So if I set up traffic shaping to give
> top priority to UDP packets and to small packets, I should broadly
> cover my common cases for low-latency traffic, correct? (Anticipated
> glitches: UDP VPNs and high-bandwidth UDP streams)
> 
> The second is multicast. My impression is that Comcast's backbone
> supports multicast; DOCSIS 2 and DOCSIS 3 both have specific allowance
> for it, and it's recommended in manufacturer docs for cable ISPs
> wanting to deliver video. My firewall logs currently show that I'm
> dropping packets with multicast destination IPs, so I know I have some
> fixes to do, there. However, I don't expect that my router is
> currently routing multicast traffic through to my internal network.

This is all so far over my head that I won't pretend to answer.

> Does anyone have any experience with enabling multicast on a Debian
> system? I thought I just needed to install mrouted, but there isn't
> even a package for it.

This interests me.  There was an mrouted package that was removed from
Debian in 2004 (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=227146)
because it was "obsolete."  Is this the same package?
-- 
john-thomas
------
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
Isaac Asimov

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