arp_cache option explain

Question

$ ip ntable show dev eth0 
inet arp_cache 
    dev eth0 
    refcnt 4 reachable 20744 base_reachable 30000 retrans 1000 
    gc_stale 60000 delay_probe 5000 queue 31 
    app_probes 0 ucast_probes 3 mcast_probes 3 
    anycast_delay 1000 proxy_delay 800 proxy_queue 64 locktime 1000 

Você pode explicar várias opções exibidas no arp_cache? Ou seja refcnt, gc_stale, queue etc.

    

Answer 1

De Documentação para iproute de Marek Andreánsky (página 30):

Refcnt shows the number of references the NDISC cache has. Val- ues above 0 prevent the NDISC cache to be prematurely freed.

Gc_stale determines how often to check for stale ARP entries (in milliseconds). After an ARP entry is stale it will be resolved again.

Queue is the length of the ARP queue, all packets to be sent for neighbor entries in the incomplete state are collected here. The queue size is in packets.