# Time synchronization

## Recommendations for NTP configuration

For stratus.a.acnca.pt use the CNCA provided NTP servers:

```
server ntp01.a.acnca.pt
server ntp02.a.acnca.pt
```

For stratus.d.acnca.pt use the CNCA provided NTP servers:

```
server ntp01.d.acnca.pt
server ntp02.d.acnca.pt
```


To use other NTP servers configure them as "peer" not "server" like:

```
peer ntp02.oal.ul.pt
peer ntp04.oal.ul.pt
peer ntp01.fccn.pt
peer ntp02.fccn.pt
```