5 votes
Accepted

OS X network stack ignores IGMP membership queries

The problem is shown in the first packet capture, where you will notice that the IGMP group join packet is an IGMPv2 packet, but the responses from the IGMP querier are all v3. This may seem fine, ...
Warren Young's user avatar
1 vote
Accepted

Which VLANs need IGMP snooping?

Answer: Yes, it's useful to limit the broadcast effects of multicast None, provided there really is no multicast Wrt. 2, there may be other limitations depending on the actual L2 device or operating ...
troglobit's user avatar
  • 211
1 vote

Disable all gratuitious ARP, TCP & HTML queries Windows 7

Generally, a network device should cope with gratuitious traffic, but there are various approaches other than trying to shut down that traffic on the clients. The client approach is time-consuming and ...
Zac67's user avatar
  • 11.5k
1 vote

OS X network stack ignores IGMP membership queries

This basically breaks IGMPv3, permanently, on most networks. Why? Because some very common implementations of mDNS (like the iPhone) frequently and gratuitously leave and rejoin 224.0.0.251 (the mDNS ...
Phil Karn's user avatar
1 vote

Multicast works only in promiscuous mode

I know the question is old, but... it was necessary to set the allmulti flag on your network card ifconfig enp3s0 allmulti
zersh's user avatar
  • 161

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