switch multicast

HI,

I have an easy question about multi cast. From what I remember routers such as cisco, dell can either block or allow multicast packets they cannot filter them like other ip addresses is that correct?


Thanks in advance

Tiff

On Mon, 19 Mar 2007, in the Usenet newsgroup comp.os.linux.networking, in
article <(E-Mail Removed)>, tiffini wrote:

>I have an easy question about multi cast.

But what does it have to do with Linux? You may want top try

comp.protocols.tcp-ip TCP and IP network protocols.

to which I've set the Followup-To: header. For specifics on hardware,
three other groups come to mind:

comp.dcom.sys.bay-networks Bay Networks hardware, software, other products.
comp.dcom.sys.cisco Info on Cisco routers and bridges.
comp.dcom.sys.nortel Nortel telecommunications products and systems.

Your news server also carries an unofficial group 'comp.dcom.sys.wellfleet'
as well.

>From what I remember routers such as cisco, dell can either block or
>allow multicast packets they cannot filter them like other ip addresses
>is that correct?

You're not explaining yourself very well - if you are referring to content
filtering, that's not the job of a router. However, routers can "filter"
on the IP address, and multicast packets certainly do have unique
destination addresses (in the 224.0.0.0/4 range). See the following RFCs
which are available through any search engine:

1301 Multicast Transport Protocol. S. Armstrong, A. Freier, K.
Marzullo. February 1992. (Format: TXT=91976 bytes) (Status:
INFORMATIONAL)

1458 Requirements for Multicast Protocols. R. Braudes, S. Zabele. May
1993. (Format: TXT=48106 bytes) (Status: INFORMATIONAL)

1812 Requirements for IP Version 4 Routers. F. Baker, Ed.. June 1995.
(Format: TXT=415740 bytes) (Obsoletes RFC1716, RFC1009) (Updated by
RFC2644) (Status: PROPOSED STANDARD)

2365 Administratively Scoped IP Multicast. D. Meyer. July 1998.
(Format: TXT=17770 bytes) (Also BCP0023) (Status: BEST CURRENT
PRACTICE)

Old guy