It looks to me like "rejoin" is essentially ip_mc_up(), and it'd be better to call that than add a nearly identical function.
Also, real interfaces already do gratuitous IGMP advertisements when they are bounced (the reason there is an ip_mc_up()). Could bonding, when failing over, simply mark the master interface as down, switch, and then mark the master as up again? In addition to doing the right thing for both IPv4 and IPv6 multicasting w/o any code changes in those layers, it may have similar benefits for ARP and neighbor discovery, right? Maybe not-- haven't looked at it... One down side for IPv6 (which apparently bonding doesn't support) is that static addresses are lost when the device goes down, but that's a difference form IPv4 that should be fixed. +-DLS - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html