How to add arp entry persistent when using NetworkManager?

Solution Verified - Updated -


  • When I add the arp entries in /etc/ethers, it can be persistent after reboot, but when I use nmcli to down/up the NIC, the entry will disappear in arp table.
# cat /etc/ethers 00:1a:4a:16:01:84

# arp -v
Address                  HWtype  HWaddress           Flags Mask            Iface             ether   00:50:56:9e:02:0e   CM                    ens192
Entries: 1      Skipped: 0      Found: 1

# nmcli con up ens192
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/3)

# arp -v
Address                  HWtype  HWaddress           Flags Mask            Iface

Entries: 0      Skipped: 0      Found: 0
  • How to let the arp entries added by manual be persistent when I up/down NIC by nmcli?


  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

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