how to troubleshoot "arpresolve: can't allocate llinfo for " errorr ?

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From: Benoit Chesneau <benoitc_at_enki-multimedia.eu>
Date: Tue, 13 Feb 2024 09:46:28 UTC

I get the following error "arpresolve: can't allocate llinfo for 1.1.245.192 on vlan320" I can't explain. (IP edited). I only setup 1.1.245.192/31 between this vlan which parent is a VF from a MLX5EN(4) card .

I am using a generated mac address and distribute IPs over OSPF  with bird. 

What could trigger this error? The doc says

```
.It "arpresolve: can't allocate llinfo for %d.%d.%d.%d"
The route for the referenced host points to a device upon which ARP is
required, but ARP was unable to allocate a routing table entry in which
to store the host's MAC address.
This usually points to a misconfigured routing table.
It can also occur if the kernel cannot allocate memory.
```

But I am not sure what to check. Any hint is welcome :)

The configuration for this vlan is locally:

```
vlan320: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500options=1c680703<RXCSUM,TXCSUM,TSO4,TSO6,LRO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6,MEXTPG,TXTLS4,TXTLS6>
ether 02:01:02:01:01:01
inet 1.1245.193 netmask 0xfffffffe broadcast 255.255.255.255
inet6 fe80::1:2ff:fe01:101%vlan320 prefixlen 64 scopeid 0x9
inet6 XXXX:XXXX:1:fe02::2 prefixlen 64
groups: vlan
vlan: 320 vlanproto: 802.1q vlanpcp: 0 parent interface: mce1
media: Ethernet 25GBase-SR <full-duplex,rxpause,txpause>
status: active
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>



```
vlan320: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
	options=1c680703<RXCSUM,TXCSUM,TSO4,TSO6,LRO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6,MEXTPG,TXTLS4,TXTLS6>
	ether 02:01:02:02:01:01
	inet 1.1.245.192 netmask 0xfffffffe broadcast 255.255.255.255
	inet6 fe80::1:2ff:fe02:101%vlan320 prefixlen 64 scopeid 0xa
	groups: vlan
	vlan: 320 vlanproto: 802.1q vlanpcp: 0 parent interface: mce1
	media: Ethernet 25GBase-SR <full-duplex,rxpause,txpause>
	status: active
	nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
```
on remote:

```


Benoît