# Prereqs

Here I assume that your NIC is called enp4s0d1

Then check if the client supports **hardware-transmit** and **hardware-receive**. 

```bash
ethtool -T enp4s0d1
```

If the client does support these two, continue on


# Prepare PTP configs

First, install the **linuxptp** package.

Then make sure that no other time synchronization services, like chrony or ntpd or systemd-timesynced, are running. 

```bash
sudo systemctl stop ntpd 
sudo systemctl stop chrony 
sudo systemctl stop systemd-timesyncd 
sudo systemctl disable ntpd
sudo systemctl disable chrony 
sudo systemctl disable systemd-timesyncd 
```


## Create PTP config file

sudo vim /etc/linuxptp/ptp4l-client.conf

```bash
[global]
verbose                 1

# Hardware timestamping using the NIC PHC
time_stamping           hardware

# Must match your grandmaster
domainNumber            0
network_transport       UDPv4
delay_mechanism         E2E

# Force this machine to be a PTP client, never grandmaster
clientOnly              1

# Useful while tuning
summary_interval        1

# Repeat these square brackets for each interface
[enp4s0]
```




# Make PTP persistent

sudo vim /etc/systemd/system/ptp4l-client.service

```bash
[Unit]
Description=PTP client on enp4s0
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/usr/sbin/ptp4l -i enp4s0 -f /etc/linuxptp/ptp4l-client.conf -m
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target
```

sudo vim /etc/systemd/system/phc2sys-client.service

```bash
[Unit]
Description=Sync system clock from enp4s0 PHC
After=ptp4l-client.service
Requires=ptp4l-client.service

[Service]
Type=simple
ExecStart=/usr/sbin/phc2sys -s enp4s0 -c CLOCK_REALTIME -w -m
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target
```



Then reload daemon and activate both PTP client and phc2sys

```bash
sudo systemctl daemon-reload
sudo systemctl enable --now ptp4l-client.service
sudo systemctl enable --now phc2sys-client.service
```



# Verification

Verify if PTP and phc2sys works with these commands

```bash
journalctl -u ptp4l-client -f
journalctl -u phc2sys-client -f
```



and also verify the status of PTP with these commands

```bash
pmc -u -b 0 'GET PORT_DATA_SET'
pmc -u -b 0 'GET TIME_STATUS_NP'
pmc -u -b 0 'GET CURRENT_DATA_SET'
```




# Boundary clock server

First, create a ptp4l-boundary-server.conf

sudo vim /etc/linuxptp/ptp4l-boundary-server.conf

```bash
[global]
time_stamping           hardware
domainNumber            0
network_transport       UDPv4
delay_mechanism         E2E
# boundary_clock_jbod     1

# Let BMCA decide:
# upstream-facing port should become SLAVE/client
# downstream-facing port should become MASTER/server
priority1               200
priority2               128

summary_interval        1

[eno1]
# toward RPi5 grandmaster

[ens1f0]
# toward Nexus
```


Here's systemd service configs for a boundary clock server

sudo vim /etc/systemd/system/ptp4l-boundary-server.service

```bash
[Unit]
Description=PTP client on <NIC1>, <NIC2>
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/usr/sbin/ptp4l -i <NIC1> -i <NIC2> -f /etc/linuxptp/ptp4l-boundary-server.conf -m
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target
```

sudo vim /etc/systemd/system/phc2sys-boundary-server.service

```bash
[Unit]
Description=Sync system clock from enp4s0 PHC
After=ptp4l-boundary-server.service
Requires=ptp4l-boundary-server.service

[Service]
Type=simple
ExecStart=/usr/sbin/phc2sys -a -rr -m
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target
```


Then reload daemon and activate both PTP client and phc2sys

```bash
sudo systemctl daemon-reload
sudo systemctl enable --now ptp4l-boundary-server.service
sudo systemctl enable --now phc2sys-boundary-server.service
```