This question is semi - related to this one: Networking - Shared to other Computers - How to find a client's IP address?
My setup is such that I'm using laptop as ethernet gateway, and raspberry is a host. In the linked question, my answer has Wireshark capture screenshot clearly shows that there is DHCP request going to my laptop from raspberry and there is response. So far so good !
Many answers on the internet suggest to check /var/lib/NetworkManager/ directory or /var/lib/dhcp directory for the leases. Problem is that in all my searches I found only leases for IP addresses that were given to my laptop. What I am interested in is finding a record of lease that my laptop gave to raspberry.
And you can take my word for it - I've searched almost everything, didn't find nothing, but for the sake of being consistent and documenting everything, here's my grep search results . . .which are basically nothing.
$ grep -R '10.42.0.40' /var/lib/NetworkManager/
grep: /var/lib/NetworkManager/secret_key: Permission denied
$ sudo grep -R '10.42.0.40' /var/lib/NetworkManager/
[sudo] password for xieerqi:
$ sudo grep -R '10.42.0.40' /etc/NetworkManager/system-connections/
[sudo] password for xieerqi:
$ sudo grep -R '10.42.0.40' /var/lib/dhcp/
[sudo] password for xieerqi:
Output of netstat requested by muru:
$ sudo netstat -unlp | grep -w 67
[sudo] password for xieerqi:
udp 0 0 0.0.0.0:67 0.0.0.0:* 14866/dnsmasq
udp 0 0 0.0.0.0:67 0.0.0.0:* 1696/dnsmasq
