Red Bear OS
27f8e351e6
arp: add statistics counters and netcfg exposure
EthernetLink gains per-interface ARP counters:
- arp_requests: ARP requests sent (incremented in send_arp)
- arp_replies: ARP replies received (incremented on cache insert)
- arp_cache_hits: successful neighbor cache lookups
- arp_cache_misses: cache misses (vacant or expired entries)
LinkDevice trait gains arp_stats() → String method.
EthernetLink implementation: 'requests=N replies=N hits=N misses=N entries=N'
netcfg exposes at /scheme/netcfg/ifaces/eth0/arp/stats:
echo /scheme/netcfg/ifaces/eth0/arp/stats
→ requests=5 replies=3 hits=142 misses=8 entries=4
Existing arp/list (MAC→IP) and arp/flush (clear) are unchanged.
Useful for monitoring ARP churn, detecting ARP storms, and debugging
neighbor discovery issues.