Pi Router / Server Setup

The setup will likely need amendment (it was done with assist from chatGPT before I realized how flakey it was... Also I havent setup SAMBA yet  

 

# 1. Make the Pi a router (kernel forwarding)

sudo sysctl -w net.ipv4.ip_forward=1

# 2. Clear any existing nftables state (safe on a Pi)
sudo nft flush ruleset

# 3. NAT table: masquerade traffic going out to the phone
sudo nft add table ip nat
sudo nft add chain ip nat postrouting { type nat hook postrouting priority 100 \; }
sudo nft add rule ip nat postrouting oif "usb0" masquerade

# 4. Filter table: allow forwarding between LAN and phone
sudo nft add table ip filter
sudo nft add chain ip filter forward { type filter hook forward priority 0 \; }

sudo nft add rule ip filter forward iif "eth0" oif "usb0" accept
sudo nft add rule ip filter forward iif "usb0" oif "eth0" ct state established,related accept

 

===============================

Raspberry Pi USB-Tether Router
(Android phone → Pi → LAN)
PERSISTENT CONFIG

===============================

ASSUMPTIONS
-----------
- Android phone provides internet via USB tethering
- On the Pi:
usb0 = upstream (phone)
eth0 = downstream (LAN / TP-Link / NUC)
- Temporary routing + NAT has already been tested and works

--------------------------------
1. ENABLE IP FORWARDING (PERMANENT)
--------------------------------

echo 'net.ipv4.ip_forward=1' | sudo tee /etc/sysctl.d/99-ipforward.conf
sudo sysctl --system

--------------------------------
2. ENSURE NFTABLES IS INSTALLED & ENABLED
--------------------------------

sudo apt update
sudo apt install -y nftables
sudo systemctl enable --now nftables

--------------------------------
3. WRITE PERSISTENT NFTABLES RULESET
--------------------------------

sudo tee /etc/nftables.conf >/dev/null <<'EOF'
#!/usr/sbin/nft -f
flush ruleset

# NAT table: masquerade traffic going out to the phone
table ip nat {
chain postrouting {
type nat hook postrouting priority 100;
oifname "usb0" masquerade
}
}

# Filter table: allow forwarding between LAN and phone
table ip filter {
chain forward {
type filter hook forward priority 0;
iifname "eth0" oifname "usb0" accept
iifname "usb0" oifname "eth0" ct state established,related accept
}
}
EOF

--------------------------------
4. LOAD RULES NOW (WITHOUT REBOOT)
--------------------------------

sudo nft -f /etc/nftables.conf
sudo systemctl restart nftables

--------------------------------
5. VERIFICATION (OPTIONAL BUT SANE)
--------------------------------

# On the Pi:
sysctl net.ipv4.ip_forward
nft list ruleset

# From a downstream machine (e.g. NUC):
# ping 192.168.1.1
# ping 1.1.1.1

--------------------------------
END
-------------------------------- 

Pi / DAC source for Valve Amp

Need: spacers

Pi / DAC Combo

Silicon Chip "Currawong Amp

 

This aint Kansas, Dorothy

 Standing waiting for a man to show

 

 Wide-eyed, one eye fixed on the door

This waiting is killing me
It's wearing me down
Day in, day out
My feet are burning holes in the ground

Darkness warmer than a bedroom floor

 

Want someone to hold me close forever more
I'm a sleeping dog, but you can't tell

  

When I'm on the prowl, you better run like hell

You know it makes sense, don't even think about it

 

Result of a bird strike - the bird was stationary.

 

Life and death are things you just do when you're bored

 

 The flight was the last one the pilot did before he retired.

 

Say fear is a man's best friend
Say fear is a man's best friend
Say fear is a man's best friend
You add it up, it brings you down
You add it up, it brings you down

Home is living like a man on the run

 

 

Trails leading nowhere, where to, my son?

 

 

We're already dead, but not yet in the ground
Come on, shake my helping hand

 

 

I'll show you around

You know it makes sense, don't even think about it

 

 
Life and death are things you just do when you're bored

Say fear is a man's best friend

 

Stunning views of Perth City .. 

 

Say fear is a man's best friend
Say fear is a man's best friend

Say fear is a man's best friend
Say fear is a man's best friend
You add it up, it brings you down

 

 Even prettier at night.

 

  You add it up, it brings you down

 

 

Say fear is a man's best friend
Say fear is a man's best friend
Say fear is a man's best friend
Say fear is a man's best friend
Say fear is a man's best friend
Say fear is a man's best friend

Say fear is a man's best friend
Say fear is a man's best friend
Say fear is a man's best friend

 

           With apologies to John Cale