Re: broadcast address of a network interface
Re: broadcast address of a network interface
- Subject: Re: broadcast address of a network interface
- From: Jens Alfke <email@hidden>
- Date: Mon, 9 Feb 2009 09:48:21 -0800
On Feb 9, 2009, at 9:12 AM, Marshall Eubanks wrote: Because of this, some wireless AP vendors either don't send multicasts at all, or don't by default. Even though multicasts sources on the wireless LAN are less of a problem, they are sometimes blocked as well. So, you will need to address these issues somehow.
Does this extend to link-local multicast on the WLAN? I haven't heard of any routers blocking that. (It would break Bonjour, for one thing; and doesn't UPnP use some form of multicast for auto-discovery?) The particular "push to talk" problem you mention is frequently done using BiDir PIM now-a-days, at least on wireline networks. See <http://www.cisco.com/en/US/netsol/ns340/ns394/ns165/ns70/networking_solutions_white_paper09186a00800a3e6c.shtml>
Interesting — I hadn't heard of Protocol-Independent Multicast before. I've just googled it, and it looks like something that needs to be implemented on routers; is that true? If so, is it widely supported by consumer-grade routers, ISPs, etc?
—Jens |
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