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Err? - Ch 7 - Verify the Local Configuration


Using: Ubuntu 20.04.4 LTS

This directory (dhclient) does not exist:

Replacing dhclient with dhcp does work.


  • coop
    coop Posts: 915

    It indeed does not exist by default least on ubuntu -- although it does exist on all Red Hat based platforms, such as RHEL, CentOS and Fedora. There is a man page on ubuntu for dhclient.releases but the file doesn't seem to be there, at least on 22.04. Maybe someone else knows the answer to this ;)

  • lee42x
    lee42x Posts: 380

    The file that contains the data sent by the dcpd server used to be stored in /var/lib/dhclient/dhcpd.leases. Network Manager may have a new location.

    It seems Network Manager stores connection information in /etc/NetworkManager/system-connections/xx-001.nmconnection. The ISC-dhcp-server configuration files may not be used any more.

  • lee42x
    lee42x Posts: 380

    The best method to view the DHCP client information in a NetworkManager environment is to have NetworkManager show us the information.
    Step 1 find the active adaptor in your system with:
    $ nmcli connection show -a
    The output should be similar to:
    Wired connection 1 8a96df6d-993f-407d-859a-62e08dc95441 ethernet enp3s0
    Notice the connection NAME on this system is:
    "Wired connection 1"

    Now fetch the DHCP data:
    $ nmcli connection show Wired\ connection\ 1 | grep "^DHCP4"
    The output should be similar to:

    DHCP4.OPTION[1]: dhcp_lease_time = 21600
    DHCP4.OPTION[2]: dhcp_server_identifier =
    DHCP4.OPTION[3]: domain_name = onapinglake.com
    DHCP4.OPTION[4]: domain_name_servers =
    DHCP4.OPTION[5]: expiry = 1677720069
    DHCP4.OPTION[6]: ip_address =
    DHCP4.OPTION[7]: next_server =
    DHCP4.OPTION[8]: requested_broadcast_address = 1
    DHCP4.OPTION[9]: requested_domain_name = 1
    DHCP4.OPTION[10]: requested_domain_name_servers = 1
    DHCP4.OPTION[11]: requested_domain_search = 1
    DHCP4.OPTION[12]: requested_host_name = 1
    DHCP4.OPTION[13]: requested_interface_mtu = 1
    DHCP4.OPTION[14]: requested_ms_classless_static_routes = 1
    DHCP4.OPTION[15]: requested_nis_domain = 1
    DHCP4.OPTION[16]: requested_nis_servers = 1
    DHCP4.OPTION[17]: requested_ntp_servers = 1
    DHCP4.OPTION[18]: requested_rfc3442_classless_static_routes = 1
    DHCP4.OPTION[19]: requested_root_path = 1
    DHCP4.OPTION[20]: requested_routers = 1
    DHCP4.OPTION[21]: requested_static_routes = 1
    DHCP4.OPTION[22]: requested_subnet_mask = 1
    DHCP4.OPTION[23]: requested_time_offset = 1
    DHCP4.OPTION[24]: requested_wpad = 1
    DHCP4.OPTION[25]: routers =
    DHCP4.OPTION[26]: subnet_mask =

    We can see the information passed to us by the dhcp server.


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