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I have a small usb-over-ethernet network of RPiZs connected to a single RPi4. I am accessing the zeros through an ethernet connection on the RPi4, so they need to send packets going to my laptop through the RPi4.

I created a hook at /lib/dhcpcd/dhcpcd-hooks/40-route which is run by /lib/dhcpcd/dhcpcd-run-hooks.

It looks like this

# /lib/dhcpcd/dhcpcd-hooks/40-route                                             
ip route replace 10.0/16 dev usb0
ip route replace 169.254/16 dev usb0 via 10.0.11.1 metric 101

If I run sudo sh /lib/dhcpcd/dhcpcd-run-hooks, it makes the appropriate changes to my ip table.

However, I have to run it manually after every start up. Is there a way to get the hooks to run automatically? Or am I going about this completely wrong.

I feel this is on-topic for RPi SE because there is no other distribution that uses dhcpcd as its default network manager.

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    this is a Linux question, not a Raspberry Pi question ... it belongs at unix.stackexchange.com/questions
    – jsotola
    Aug 6, 2022 at 17:44
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    Unfortunately, your question has been closed to new answers. I've submitted a request that it be re-opened, but that's probably a long-shot. Before I invest more time, can you tell me if you've read this?
    – Seamus
    Aug 8, 2022 at 4:47
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    I've re-opened this, but you might want to demonstrate more definitely that it does not run, eg., by shimming in something like date >> /tmp/run-hook.log; echo $reason >> /tmp/run-hook.log. Note that if it is running, it is probably executed a bunch of times in close succession, since you don't appear to have checked the context via the environment at all.
    – goldilocks ♦
    Aug 8, 2022 at 14:38
  • The meatier bits of /etc/dhcpcd.conf might be useful too.
    – goldilocks ♦
    Aug 8, 2022 at 14:41
  • @goldilocks thank you for the advice. Unfortunately, I got pulled away from this project and only just managed to do some investigating. You are right, it runs a bunch of times when the dhcpcd service gets restarted. I printed the $reason, $interface, and ip route before and after the changes. I found that the ip table changes remains stable with my changes in every round except the second to last where no reason or interface is listed, but in the next/final run the ip table starts missing my changes. Last round is IPV4LL for usb0. Then the changes are gone once it is started.
    – Rusty
    Jan 24 at 22:43

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