Subject: Re: question about function igmp_stop_timer() in net/ipv4/igmp.c

From: Andrew Lunn <[email-masked]>
Date: Tue, 25 Oct 2016 14:19:36 +0200

> Otherwise the host can't send IGMP leave message when it leaves the
> group because the im->reporter is 0.

Leave is optional for IGMP v2, so net sending it is fine. And only a
querier is going to take any notice of it.

What happens when you have a querier in your network and you are using
IGMPv3. That is the use case which matters.

     Andrew