So I have some entries like the ones below. I have a system setup to do all the routing/dhcp/dns. This is a private network for education purposes only, and I have no idea how half of these addresses got in the arp table.

shell>arp -n
192.58.128.30 (incomplete) eth0
192.228.79.201 (incomplete) eth0
192.36.148.17 (incomplete) eth0
192.168.1.100 ether 00:11:22:33:44:55 C eth0
192.8.10.90 (incomplete) eth0
10.0.0.100 ether 00:11:22:33:44:55 C eth0
10.0.0.1 * <from_interface> MP eth0

I have a private network with 10.x.x.x, mask 255.0.0.0, and one addition computer with a static 192.168.1.100. There are only three computers (hooked up through a switch).

I've tried deleting entries manually i.e.:
arp -d 192.58.128.30

and get the error:
SIOCDARP(dontpub): Network is unreachable

I can't figure out how to just clear the table. That's all I want. Is that too much to ask? I also noticed in Wireshark that packets are constantly being sent to find the MAC address that these IPs belong too. I really want that to stop happening.

EDIT:
I have also tried using ip neighbor. I ran "ip neighbor del 192.58.128.30 dev eth0", and it gave no errors but didn't remove the entry. All the ones without a MAC are also listed as FAILED in ip neighbor.

Ideas?
Thanks in advance

I absolutely can't believe this. Two days looking at this problem, I finally make a post and found a solution. I accidentally stumbled up where you can turn ARP off! For anyone with the same issue, I used ip link to fix the issue by first turning ARP off and turning ARP back on.

If you turn off the arp link, how would your device be able to get the mac address of any other device added to the network.

1 members found this post helpful.

Generally arp command is 10-10- or 10:10: form. Not sure I've seen a 10.10. but maybe.

Use arp option to show static and dynamic entries.

you don't want to delete arp entries. it messes things up no matter what you think the situation is.

let the kernel do it. it will do it correctly.