wenquan2015 opened a new pull request, #17688:
URL: https://github.com/apache/nuttx/pull/17688
## Summary
support ARP entry learned on gratuitous ARP
## Impact
arp
## Testing
```
from scapy.all import *
def send_gratuitous_arp(ip, iface=None):
arp = ARP(
op=1,
psrc=ip,
pdst=ip
)
ether = Ether(dst="ff:ff:ff:ff:ff:ff")
packet = ether/arp
sendp(packet, iface=iface)
send_gratuitous_arp("10.0.1.4", "nuttx0")
```
test result, targe ip 10.0.1.4 is not exist, when received gratuitous ARP,
the icmp request can be sent out
:
```
14:44:00.835864 ARP, Request who-has 10.0.1.4 tell 10.0.1.2, length 28
14:44:01.845825 ARP, Request who-has 10.0.1.4 tell 10.0.1.2, length 28
14:44:02.855858 ARP, Request who-has 10.0.1.4 tell 10.0.1.2, length 28
14:44:03.679762 ARP, Request who-has 10.0.1.4 tell 10.0.1.4, length 28
14:44:03.865695 IP 10.0.1.2 > 10.0.1.4: ICMP echo request, id 2, seq 4,
length 64
14:44:04.875830 IP 10.0.1.2 > 10.0.1.4: ICMP echo request, id 2, seq 5,
length 64
14:44:05.886016 IP 10.0.1.2 > 10.0.1.4: ICMP echo request, id 2, seq 6,
length 64
```
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