Hi, Luke, I have not used a ROACH2 to send multicast packets, but the MeerKAT folks certainly have. My understanding is that the 10 GbE block does the proper mapping of multicast destination IP address to multicast destination MAC address so it should "just work".
I recommend starting with a direct connection between a ROACH2 and a PC. That way the PC's NIC will get the packets without having to interact with an intervening switch. That will let you examine the packets using tcpdump or wireshark. To get the kernel to pass the multicast packets up the network stack, I think you will still need to use the IP_ADD_MEMBERSHIP socket option (see "man 7 ip" for details). When you have that working, then you can add a switch into the path. The IP_ADD_MEMBERSHIP option will inform the switch (via IGMP) of the multicast group (i.e. address) that you wish to receive packets for. HTH, Dave > On Jan 28, 2019, at 08:08, Luke Hawkins <lhawk...@nrao.edu> wrote: > > CASPERites, > > Has anybody been using ROACH2s to transmit multicast packets? > > I found the following two threads on the mailing archive, and was > wondering if the 10GbE blocks had been updated since then in ways that > could impact multicasting, or if anybody had any comments on preferred > IGMP snooping switches, etc... > > https://www.mail-archive.com/casper@lists.berkeley.edu/msg06132.html > https://www.mail-archive.com/casper@lists.berkeley.edu/msg04527.html > > -Luke Hawkins > > -- > You received this message because you are subscribed to the Google Groups > "casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To post to this group, send email to casper@lists.berkeley.edu. -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
