> Hello, > I couldn't understand why NUD is the responsibility of IP, > but the other is not. > > So, why NUD isn't the link-layer's responsibility?
=> Because of two reasons: - Some link layers fon't have this connection-oriented service and therefore do not do NUD. - NUD tests reachability of the IP peer not the link layer peer. Since there can be multiple link layers between two peers, relying on link layers in not useful to IP. But I certainly don't expect NUD to test every channel within a link layer, it's not a useful mechanism anyway because testing the traffic channels does test general reachability of the physical media. Hesham > > Thanks, > pars > > > > > > Hesham > > > > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- > -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
