David Daney wrote:
Following your logic through, It seems that you are advocating
broadcasting *all* ARP packets on *all* link local addresses. That
would mean that on a 192.168.* switched Ethernet network with DHCP
that twice as many ARP packets would be broadcast.
192.168.* addresses are not considered "link local", they are rather
"private" or "site local" addresses.
The scope parameter, as far as I can tell, is used to make routing
decisions. Overloading it to also implement the RFC 3927 ARP
broadcasting requirement would result in generation of unnecessary
network traffic in configurations that are probably the majority of
Linux deployments.
No extra network traffic, but there is some measurable overhead to
looking up the scope in the routing table.
One problem is having this type of scheme behave properly by default,
i.e. in the absence of user specified entries. Having to create an
entry for every interface in the system just to get RFC standard
behavior is silly.
- Mark
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