Flex100H ARP entries

copossum

hi all,

I am trying to set up the necessary entries for wake on lan to work via the CLI on a USG Flex 100H, firmware version 5.42(ABUH.0).
I am following this guide: https://community.zyxel.com/en/discussion/30559/how-do-i-create-a-static-arp-entry-on-usg-flex-h-series-devices
It worked fine, until after adding a few entries this error message appeared after issuing the "commit" command:
2026-07-20 15:00:00 ERROR: [LY] Data location "/vrouter:config/vrf[name='main']/vrouter-interface:interface/vrouter-ethernet:ethernet[name='my_lan_if']/ipv4/neighbor[ip='192.168.1.1']".: Too many "neighbor" instances.

Now I cannot add another entry, no matter the IP/MAC address combination. Do I need to delete an entry marked as "stale" first? Is there a limit to the entries I can add
manually via the CLI?

thank you and cheers
copossum

Zyxel_Judy

Hi @copossum ,

Currently, the maximum is 5 static ARP entries. If you want to add a new entry, please follow the CLI below to delete an old one first:

usgflex200hp> edit running
usgflex200hp running config# vrf main interface ethernet ge3
usgflex200hp running ethernet ge3# ipv4
usgflex200hp running ipv4# del neighbor 192.168.168.23
usgflex200hp running ipv4# commit
Configuration committed.
usgflex200hp running ipv4# copy running startup

If you need more than 5 entries, please submit an idea in Security Idea, and share more details about your application and scope.

Zyxel_Judy

Hi @copossum ,

Currently, the maximum is 5 static ARP entries. If you want to add a new entry, please follow the CLI below to delete an old one first:

usgflex200hp> edit running
usgflex200hp running config# vrf main interface ethernet ge3
usgflex200hp running ethernet ge3# ipv4
usgflex200hp running ipv4# del neighbor 192.168.168.23
usgflex200hp running ipv4# commit
Configuration committed.
usgflex200hp running ipv4# copy running startup

If you need more than 5 entries, please submit an idea in Security Idea, and share more details about your application and scope.

copossum

https://community.zyxel.com/en/discussion/comment/85956#Comment_85956

two more questions: is it 5 static arp entries per interface? and do I need to delete a static (permanent) entry or can I delete one marked as "stale" to make way for another permanent entry?

thank you

Zyxel_Judy

Hi @copossum ,

Yes, 5 static ARP entries per interface, you can try it.

Zyxel_Judy

Since that interface already has 5 static (permanent) entries, you need to delete one existing static (permanent) entry before you can add a new one.