Support reconfigure

[Izorkin]

I added following setting to configuration:

define 145 array byte forcerenew_nonce_capable

I send a reconfiguration request through the DHCP server, but there is no response from DHCP client side.

Using tcpdump can see that the requests are coming in, but the DHCP client debug log is currently showing nothing.

Maybe I'm setting it up incorrectly?

[rsmarples]

dhcpcd doesn't require any explicit setup for this.
If you don't specify any authentication then dhcpcd will send the DHO_FORCERENEW_NONCE option by default:

The DHCP server will then send a nonce back in code 90 which dhcpcd will use to authenticate the force renew message from the server.

You should be able to verify this with tcpdump.

[Izorkin]

On DHCP server I see that Reconfigure key has been received. I give the command "Send configuration", in "Reconfigure status" shows "FORCERENEW sent, awaiting response".

[rsmarples]

So full disclosure, I don't have a DHCP server that supports authentication ..... yet.
I might add it to dhcpsd to help diagnose any issues.

Anyway, it should work, but to verify any issues you'll need to email me a tcpdump of the DHCP transactions at the client side.
tcpdump -s0 -w/tmp/dhcpcd.cap -I eth0 port bootpc should do it - adjust the interface to taste.

I need to see the DHCP DISCOVER or REBIND with the server OFFER or ACK to this. Then any FORCERENEW sent as well.