On Thu, Feb 17, 2022 at 05:26:15PM +0100, Janusz Użycki wrote:

> From our observations for IPv4 (L4) E2E it still applies to ptp4l. On Cisco
> and Netgear switches (even L3 set as L2 switch) IGMP snooping must be
> disabled for proper PTP multicast work.

So their "IGMP snooping" feature is broken.  Ask them to fix it.

Thanks,
Richard


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