Re: What does "ICMP to 224.0.0.2" mean?

From: Andy Searle (andy.searle_at_ntlworld.com)
Date: 11/20/04 

Date: Sat, 20 Nov 2004 01:50:06 GMT

"Mark McIntyre" <markmcintyre@spamcop.net> wrote in message
news:hohrp0deed49ekllpmon9r8v8c79g1b2eg@4ax.com...
> On Fri, 19 Nov 2004 00:23:39 GMT, Zarbol Tsar <zarbol@tsar.net> wrote:
>
> >Stephen, I may have misunderstood you but I don't have a local LAN or
> >any LAN at all. My PC is standalone. The only connection it has is
> >via Ethernet to my cable modem.
>
> Your cable modem is effectively a 1-port router.
>
> You might find a google for your exact subject line would be useful
> too. This is from CISCO's website:
>
> Reserved Link Local Addresses
>
> The IANA has reserved addresses in the 224.0.0.0 through 224.0.0.255
> to be used by network protocols on a local network segment. Packets
> with these addresses should never be forwarded by a router; they
> remain local on a particular LAN segment. They are always transmitted
> with a time-to-live (TTL) of 1.
>
> Network protocols use these addresses for automatic router discovery
> and to communicate important routing information. For example, OSPF
> uses 224.0.0.5 and 224.0.0.6 to exchange link state information. Table
> 43-1 lists some of the well-known addresses.
>
> Table 43-1: Link Local Addresses
> Address Usage
>
> 224.0.0.1 All systems on this subnet
> 224.0.0.2 All routers on this subnet
>
> In other words, this is benign local traffic and if your firewall is
> blocking it, then its misconfigured or misdesigned.

It could be the "Universal Plug & Play" feature running under XP announcing
its presence to multicast routers on the local network. UP&P can be disabled
as nothing uses it yet - basically it will be a network plug and play
protocol one day - maybe! Info here on how to disable it
http://grc.com/UnPnP/UnPnP.htm

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