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- Newsgroups: comp.sys.isis
- Path: sparky!uunet!mcsun!inesc.inesc.pt!freya.inesc.pt!werner
- From: werner@freya.inesc.pt (Werner Vogels)
- Subject: Re: FDDI multicast?
- Message-ID: <1992Dec25.160102.7281@inesc.pt>
- Sender: usenet@inesc.pt (USENET News System)
- Nntp-Posting-Host: freya.inesc.pt
- Organization: INESC - Instituto de Engenharia de Sistemas e Computadores, Lisboa, Portugal
- References: <1992Dec25.032548.13096@cs.cornell.edu>
- Date: Fri, 25 Dec 1992 16:01:02 GMT
- Lines: 18
-
- In article <1992Dec25.032548.13096@cs.cornell.edu>, ken@cs.cornell.edu (Ken Birman) writes:
- |> Werner's message leaves me curious: how does one get at FDDI
- |> multicast from UNIX? Is the "model" similar to ipmcast?
-
- The model is independent of ipmcast, You just need an ioctl to your
- controller to add and delete mcast addresses. Like it happends now
- in if_ether.c you will need a CLASSD to MAC address conversion and problably
- you want some bookkeeping. The real hardware stuff is left to the device
- driver. If the driver is correctly written you do not really need to keep
- much state about duplicate joins of ipmcast groups; the driver should
- maintain this itself. In the pre ipmcast SunOS 4.1.1 days you could
- find the multicast addresses at controller in the arpcom structure which
- is part of every if es_if (ethernet), but the new ipmcast ethernet module
- does different bookkeeping.
-
- --
- Werner
-
-