Hi! On 19:22 Fri 08 Feb , Zheng Da wrote: > Recently, I try to understand the implementation of the routing subsystem. > It's so complex, and I'm quite confused by so many different structures. > As my understanding about the four structures fib_node, fib_alias, fib_info, > and fib_nh: > fib_node can be used to identify a subnet or a host. > fib_alias is used to represent a route. > fib_info contains the real routing information. > fib_nh contains the information of the next hop. > I can understand fib_node can have a few fib_alias objects because Linux > supports multipath. For the same subnet, there may exist several routes to > it. > Several fib_alias objects share one fib_info, it's still reasonable because > different routes may share the same parameter values of an existing fib_info > object. > But why one fib_info can have several fib_nh objects? That means a route may > have several next hops, but it seems unreasonable. > Can someone show me an example to help me understand it? > Thank you in advance. What happens when multiple interfaces have an address in the same subnet? This is just a guess, I'm not so deeply involved in IP routing. -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.homelinux.net -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
