Arp Request Issue

Hello,

I’ve here an odd situation that I’m not sure in which category I can fit this in.

I’ve a VM posing as a router which has a network adapter with access to a network 10.1.1.0/24.
What happens it’s that in the configuration of the router I don’t want to have access to the whole network / 24 and for that, I’d set up a / 32 and then a default route to the gateway.

In Vyos 1.2.5 I executed the following command to set up the interface:

set ethernet interface eth0 address 10.1.1.1/32

Vyos reply to the arp requests normally.

What happens it’s that in the Vyos 1.3 with the same configuration it doesn’t reply to any arp request.

Someone can help me solve this possible “problem”?

Hello @alaland, I have the similar behavior on 1.2.5 and latest rolling.
Screenshot 2020-08-03 at 08.47.37

You can try to add interface route, in other cases I don’t know why VyOS with /32 should reply to ARP.

set protocols static interface-route 0.0.0.0/0 next-hop-interface eth0

Or define necessarily reachable IP addresses

set protocols static interface-route 10.1.1.1/32 next-hop-interface eth0