Leonardo Pappagallo wrote: > hi Jan > > I have created a net with machines that belong to different IP range, as it > is showned below: > > > # > # Examplary TDMA configuration file > # > > # Primary master > > master: > ip 192.0.0.229 > cycle 4000 > slot 2 500 > slot 0 3500 1/5 > > # Slave A > slave: > ip 192.0.1.244 > slot 2 1000 > slot 0 3500 2/5 > > # Slave B > slave: > ip 192.0.1.241 > slot 2 1500 > slot 0 3500 3/5 > > # Slave C > slave: > ip 192.0.0.205 > slot 2 2000 > slot 0 3500 4/5 > > # Slave D > slave: > ip 192.0.1.235 > slot 2 2500 > slot 0 3500 5/5 > > Into file rtnet.conf I have utilized the same NETMASK="255.255.255.0" for > all machines. >
If both hosts with 192.168.0.x and 192.168.1.x share the same physical network segment, I don't see the reason for setting this particular netmask. > when I send an IP/UDP packet type whit address "192.0.1.255" or "192.0.0.255", > this packet is received from all machines. > > Is possible to do this with RTnet? Aah, I think I'm starting to understand: you want to send broadcast packets separately to both groups, don't you? Yes this will not work as usual as RTnet does not explicitly match the target IP address of incoming packets with the receivers address and mask - this has been removed during the routing system revision. All packets a node receives physically are also being delivered. Typically, we do not need such an extra check and we can save the required operations here. Two options: 1. Filter at application level, which means that you will have to live with an additional unneeded task wakeup here. 2. Reintroduce the filter at protocol level (as an optional feature e.g. - patches will be welcome). But note that this will still let the node receive the packet physically! You only save a fraction of the overhead when the NIC does not do the filtering. A real solution would be multicasting. But, unfortunately, we are still lacking this feature and there are currently no resources in sight to fill this gap. Jan
signature.asc
Description: OpenPGP digital signature
