This reverts commit 4ccd48cb2693a3603f14a30b6286228597285d92. From RFC 4861 section 4.2. > The Router Lifetime applies only to the router's usefulness as a default > router; it does not apply to information contained in other message fields > or options. Options that need time limits for their information include > their own lifetime fields. Hence, based on the lifetime field of the message header, we should not drop any other information. Note that, in ndisc_router_process_default(), we have already dropp the default gateway when the lifetime is zero. Hence, we can safely drop the change.
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