Re: Question about IGMP host implementation

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Hi Kunal,

             Yes it should. The scenario that I have in mind is a switch
whose mrouter interface is in vlanA and igmp joins are received on an
interface in vlanB. In this case, query coming from vlanA(different subnet)
has to be answered by hosts in vlanB.

Thanks,
Indranil

On Wed, Oct 12, 2011 at 6:08 AM, Kunal Shah <[email protected]> wrote:

>  Hi all,
>
> Can an IGMPv2 host respond to a general query originated from a subnet
> other then its own?? RFC 2236 states:
>
> ""query received" occurs when the host receives either a valid
>      General Membership Query message, or a valid Group-Specific
>      Membership Query message.  To be valid, the Query message must be
>      at least 8 octets long, and have a correct IGMP checksum.  The
>      group address in the IGMP header must either be zero (a General
>      Query) or a valid multicast group address (a Group-Specific Query)"
>
> There is no requirement for the source address to be on the same subnet as
> the host.
>
> Thanks,
> Kunal
>
>
> _______________________________________________
> magma mailing list
> [email protected]
> https://www.ietf.org/mailman/listinfo/magma
>
>

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<div>Hi Kunal,</div>
<div>=A0</div>
<div>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Yes it should. The scenario that =
I have in mind is a switch whose mrouter interface is in vlanA and igmp joi=
ns are received on an interface in vlanB. In this case, query coming from v=
lanA(different subnet) has to be answered by hosts in vlanB.</div>

<div>=A0</div>
<div>Thanks,</div>
<div>Indranil<br><br></div>
<div class=3D"gmail_quote">On Wed, Oct 12, 2011 at 6:08 AM, Kunal Shah <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:[email protected]">kunal.shah@eri=
csson.com</a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div><font size=3D"2" face=3D"Arial, sans-serif">
<div>Hi all,</div>
<div>=A0</div>
<div>Can an IGMPv2 host respond to a general query originated from a subnet=
 other then its own?? RFC 2236 states: </div>
<div>=A0</div>
<div>&quot;<font face=3D"Courier New, monospace">&quot;query received&quot;=
 occurs when the host receives either a valid<br>=A0=A0=A0=A0 General Membe=
rship Query message, or a valid Group-Specific<br>=A0=A0=A0=A0 Membership Q=
uery message.=A0 To be valid, the Query message must be<br>
=A0=A0=A0=A0 at least 8 octets long, and have a correct IGMP checksum.=A0 T=
he<br>=A0=A0=A0=A0 group address in the IGMP header must either be zero (a =
General<br>=A0=A0=A0=A0 Query) or a valid multicast group address (a Group-=
Specific Query)</font>&quot; </div>

<div>=A0</div>
<div>There is no requirement for the source address to be on the same subne=
t as the host.</div>
<div>=A0</div>
<div>Thanks,</div>
<div>Kunal</div>
<div>=A0</div></font></div><br>____________________________________________=
___<br>magma mailing list<br><a href=3D"mailto:[email protected]">[email protected]=
rg</a><br><a href=3D"https://www.ietf.org/mailman/listinfo/magma" target=3D=
"_blank">https://www.ietf.org/mailman/listinfo/magma</a><br>
<br></blockquote></div><br>

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