Thanks Martin! I'm not at the point of adding code to this project yet ... close but not yet :) This will certainly give me a head start if that happens. -> Rob On Fri, Oct 25, 2024 at 4:39 AM Martin Tonusoo <martin@xxxxxxxxxx> wrote: > > Hi Rob, > > perhaps something like this will do: > https://gist.github.com/tonusoo/0490bc5cf564689f3999f1de4eef098d > > On Debian based distributions the dependencies can be installed with > "apt install --no-install-recommends python3-pcapy python3-scapy". > Pcapy is a wrapper library for libpcap which processes the filter in > Berkeley Packet Filter syntax, builds the binary bytecode and > eventually sends it to the kernel via the SO_ATTACH_FILTER. Thus, > there should be very little impact on throughput or CPU usage. > > I used a following systemd service to manage the script: > > root@deb12-1:~# systemctl cat packet-forwarder > # /etc/systemd/system/packet-forwarder.service > [Unit] > Description=Forwards certain packets received on eth0 out from eth1 > After=network.target > > [Service] > Type=simple > Restart=always > ExecStart=/usr/local/sbin/packet-forwarder.py > > [Install] > WantedBy=multi-user.target > root@deb12-1:~# > > > Martin
