(ΦωΦ) Catudp's blog

The Problem

My home router started crashing frequently after running FR24 Feed.

• 6–12 crashes per day
• Netflix interruptions (family complaints 😅)
• Raspberry Pi running FR24 + SDR workload

Environment:

• MAP-E (IPv4 over IPv6)
• CGNAT-like behavior
• Frequent keepalive / UDP traffic

Why It Happens

In MAP-E / DS-Lite / CGNAT environments:

• NAT tables fill quickly
• UDP keepalive increases session load
• Retransmissions multiply traffic
• Router CPU usage spikes

The Solution: Tailscale Exit Node on VPS

Instead of using a commercial VPN, I used my own VPS as an Exit Node.

Step 1 – Enable forwarding on VPS:

sudo nano /etc/sysctl.d/99-tailscale.conf
net.ipv6.conf.all.forwarding=1
net.ipv4.ip_forward=1
sudo sysctl --system

Step 2 – Advertise Exit Node:

sudo tailscale up --advertise-exit-node --accept-dns=false --ssh

Step 3 – Raspberry Pi:

sudo tailscale up --exit-node=<VPS-name> --accept-dns=false --ssh

Verification

curl -4 ifconfig.me

Returned: 160.xxx.xxx.xxx (VPS IP) This confirmed that outbound traffic was routed via the VPS.

Results

Before:

• 6–12 router crashes per day

After:

• ~0.5 crashes per day (almost stable)
• No more Netflix interruptions
• FR24 Feed stable

Important Note

This may help if you use:

• MAP-E
• DS-Lite
• CGNAT
• Starlink
• Mobile broadband

If your router struggles with frequent UDP sessions, moving traffic through a stable Exit Node can significantly reduce load.

I did not keep exact logs, but based on router resets and family complaints, the crash frequency was approximately 6–12 times per day.

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