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Diffstat (limited to 'mcast/README')
| -rw-r--r-- | mcast/README | 52 |
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diff --git a/mcast/README b/mcast/README new file mode 100644 index 0000000..d15176c --- /dev/null +++ b/mcast/README @@ -0,0 +1,52 @@ +# +# $Id$ +# + +This directory contains a very simple multicast demo program. There +are multiple multicast demo programs on the Internet and this program +is a combination of those. + +Native Programs +=============== +Two native programs are built as a side-effect of the RTEMS make. +They are listener and mcast. + ++ listener is a pure listener + ++ mcast sends and receives data and is the same program run on the + RTEMS target + + +Driver Requirements +=================== ++ NIC must set IFF_MULTICAST bit in if_flags during attach + + ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST; + ++ NIC must support SIOCADDMULTI and SIOCDELMULTI ioctls. + + case SIOCADDMULTI: + case SIOCDELMULTI: { + struct ifreq* ifr = (struct ifreq*) data; + error = (command == SIOCADDMULTI) + ? ether_addmulti(ifr, &sc->arpcom) + : ether_delmulti(ifr, &sc->arpcom); + + if (error == ENETRESET) { + if (ifp->if_flags & IFF_RUNNING) + error = // driver specific routine to adjust filtering + } + break; + } + + In some drivers, there is no need to adjust any driver specific + filtering. In this case, set error = 0 in the above code. + +GNU/Linux +========= +You will have to have a route in place. Something like this command should +work if you adjust the 192.168.1.244 to match your IP addresa and adjust the +239.9.8.0 to match the multicast address used in mcast_params.h: + +/sbin/route add -net 239.9.8.0 netmask 255.255.255.0 gw 192.168.1.244 dev eth0 + |