> According to RFC 2461 section 7.2.5 - Receipt of Neighbor Advertisements, a
> host is to set the isRouter flag in the Neighbor Cache entry based on the
> Router flag in the received advertisement.
>
> So, if the flag changes, should the host make the necessary modifications to
> the Default Router list also?
See section 7.2.5 which says
- The IsRouter flag in the cache entry MUST be set based on the
Router flag in the received advertisement. In those cases where
the IsRouter flag changes from TRUE to FALSE as a result of this
update, the node MUST remove that router from the Default Router
List and update the Destination Cache entries for all destinations
using that neighbor as a router as specified in Section 7.3.3.
This is needed to detect when a node that is used as a router
stops forwarding packets due to being configured as a host.
Erik
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