# Network services

The LAA provide basic network services to the DUT on the [private ethernet port](/hardware/peripherals.md#private-ethernet) only.

## DHCP

The LAA will answer to dhcp requests with always the same IPv4 configuration:

* ipv4: `198.18.0.2`
* netmask: `255.255.255.0` or `/24`
* route: `198.18.0.1`

```{admonition} Multiple MAC
:class: tip
The dhcp server will revoke all the dhcp leases every time the private ethernet
connection goes down.

This allows for the DUT to change MAC address from one boot to another while
still being assigned the same IPv4.
```

The [dhcp server](https://www.isc.org/kea/) also advertises the LAA
(`198.18.0.1`) as ntp, dns and next server (pxe boot).

## DNS

The LAA provides a [DNS server](https://dnsmasq.org/doc.html) on the private ethernet port at `198.18.0.1`.

The DNS server uses the locally provided DNS server on the public ethernet port and fallbacks to:

* cloudflare: `1.1.1.1`, `1.0.0.1`, `2606:4700:4700::1111` and `2606:4700:4700::1001`
* google: `8.8.8.8`, `8.8.4.4`,`2001:4860:4860::8888` and `2001:4860:4860::8844` 

## NTP

The LAA provides an [NTP server](https://chrony-project.org/) on the private
ethernet port at `198.18.0.1`.

The LAA uses `0.openembedded.pool.ntp.org` as the reference pool.