zhhyu7 opened a new pull request, #17749:
URL: https://github.com/apache/nuttx/pull/17749
## Summary
1. Improve the behavior of the ARP table so that the manually configured
ARP table has the highest priority, can only be manually modified to
other values, otherwise will never change again, and will not time out.
The modified behavior is consistent with that of Linux.
2. Improve the behavior of the ARP table so that the manually configured
ARP table has the highest priority, can only be manually modified to
other values, otherwise will never change again, and will not time out.
The modified behavior is consistent with that of Linux.
## Impact
net:arp
## Testing
sim:matter with ping
NuttX log:
```
NuttShell (NSH) NuttX-12.12.0-RC0
MOTD: username=admin password=Administrator
nsh> ping -c 3 10.0.1.1
PING 10.0.1.1 56 bytes of data
56 bytes from 10.0.1.1: icmp_seq=0 time=0.0 ms
56 bytes from 10.0.1.1: icmp_seq=1 time=0.0 ms
56 bytes from 10.0.1.1: icmp_seq=2 time=0.0 ms
3 packets transmitted, 3 received, 0% packet loss, time 3030 ms
rtt min/avg/max/mdev = 0.000/0.000/0.000/0.000 ms
nsh> ping -c 3 10.0.1.3
PING 10.0.1.3 56 bytes of data
56 bytes from 10.0.1.3: icmp_seq=0 time=20.0 ms
56 bytes from 10.0.1.3: icmp_seq=1 time=10.0 ms
56 bytes from 10.0.1.3: icmp_seq=2 time=10.0 ms
3 packets transmitted, 3 received, 0% packet loss, time 3030 ms
rtt min/avg/max/mdev = 10.000/13.333/20.000/4.714 ms
nsh> ping -c 3 10.0.1.4
PING 10.0.1.4 56 bytes of data
ERROR: sendto failed at seqno 0: 101
ERROR: sendto failed at seqno 1: 101
ERROR: sendto failed at seqno 2: 101
3 packets transmitted, 0 received, 100% packet loss, time 3030 ms
nsh> ping -c 3 10.0.1.3
PING 10.0.1.3 56 bytes of data
56 bytes from 10.0.1.3: icmp_seq=0 time=10.0 ms
56 bytes from 10.0.1.3: icmp_seq=1 time=10.0 ms
56 bytes from 10.0.1.3: icmp_seq=2 time=10.0 ms
3 packets transmitted, 3 received, 0% packet loss, time 3030 ms
rtt min/avg/max/mdev = 10.000/10.000/10.000/0.000 ms
nsh> poweroff
[Inferior 1 (process 2446441) exited normally]
(gdb) q
nuttx$ cat .config | grep ARP
# ARP Configuration
CONFIG_NET_ARP=y
CONFIG_NET_ARPTAB_SIZE=16
CONFIG_NET_ARP_MAXAGE=120
CONFIG_NET_ARP_MAXAGE_UNREACHABLE=1
# CONFIG_NET_ARP_IPIN is not set
# CONFIG_NET_ARP_GRATUITOUS is not set
CONFIG_NET_ARP_SEND=y
CONFIG_NET_ARP_SEND_QUEUE=y
CONFIG_ARP_SEND_MAXTRIES=5
CONFIG_ARP_SEND_DELAYMSEC=20
# CONFIG_NET_ARP_ACD is not set
# end of ARP Configuration
# CONFIG_NSH_DISABLE_ARP is not set
```
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