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multicast to 224.0.0.1 from my ADSL router every 15 seconds

Posted on 2013-02-05
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Last Modified: 2013-02-06
Hello my router ADSL zyxel send a multicast to 224.0.0.1 every 15 seconds.

It's normal this?

Thanks
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Question by:limmontreefree
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Ernie Beek earned 500 total points
ID: 38858596
Could be IGMP:

IGMP (Internet Group Management Protocol) is a session-layer protocol used to establish membership in a multicast group - it is not used to carry user data. IGMP version 2 (RFC 2236) is an improvement over version 1 (RFC 1112) but IGMP version 1 is still widely used. If you would like to read more detailed information about interoperability between IGMP version 2 and version 1, please see sections 4 and 5 of RFC 2236. The class D IP address is used to identify host groups and can be in the range 224.0.0.0 to 239.255.255.255. The address 224.0.0.0 is not assigned to any group and is used by IP multicast computers. The address 224.0.0.1 is used for query messages and is assigned to the permanent group of all IP hosts (including gateways). All hosts must join the 224.0.0.1 group in order to participate in IGMP. The address 224.0.0.2 is assigned to the multicast routers group. The Prestige supports both IGMP version 1 (IGMP-v1) and IGMP-v2. At start up, the Prestige queries all directly connected networks to gather group membership. After that, the Prestige periodically updates this information by sending a membership query to 224.0.0.1. IP Multicasting can be enabled/disabled on the Prestige LAN and/or WAN interfaces using menus 3.2 (LAN) and 11.3 (WAN). Select None to disable IP Multicasting on these interfaces

So it could be the router is querying for other (IGMP) devices.
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Author Closing Comment

by:limmontreefree
ID: 38858620
Thanks a lot.
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LVL 35

Expert Comment

by:Ernie Beek
ID: 38858643
My pleasure, thx 4 the points :)
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