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Add support for ARP/ND Timestamps when retriving neighbors #1039

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On Linux, Netlink provides NDA_CACHEINFO which carries timestamps about when ARP/ND was updated, used, and confirmed.

struct nda_cacheinfo {
    __u32         ndm_confirmed;
    __u32         ndm_used;
    __u32         ndm_updated;
    __u32         ndm_refcnt;
};

Expose these fields in the Neigh type

On Linux, Netlink provides NDA_CACHEINFO which carries timestamps about
when ARP/ND was updated, used, and confirmed.

Expose these fields in the Neigh type
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