I was not able to get /31 point to point Ethernet links working (ROS 5.18).
It seems that ROS is not able to use a /31 even address (the network one) as a local address.
Inside a /31, there is no more directed broadcast address, and the network address (the even one) become the remote or the local address according to wich side of the link we are.
Did anyone got it working ?
On a similar subject, subnet directed broadcast does not work between different subnets. The subnet broadcast is not delivered localy when it is sent from another subnet. This is a problem for Wake on Lan for example. It is possible to use some tricks to avoid using it, but it would be simpler if we could activate directed broadcast on Ethernet interfaces.