Public bug reported:
1) We are using a custom ISO but it is based on ubuntu 24.04
2) ```netplan.io:
Installed: 1.0-2ubuntu1
Candidate: 1.0-2ubuntu1
Version table:
*** 1.0-2ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu noble/main amd64 Packages
100 /var/lib/dpkg/status
```
3) What I expected to happen:
Applying a simple ethernet configuration like
```
network:
version: 2
renderer: networkd
ethernets:
ethX:
dhcp4: true
```
then running netplan status would correctly return that the address
comes from the DHCP server.
4) What happened instead:
Applying the above config, netplan status output yields
```
enp181s0f0np0 ethernet UP (networkd: enp181s0f0np0)
MAC Address: 5c:25:73:64:11:9e (vendor)
Addresses: 10.211.1.250/23
fe80::5e25:73ff:fe64:119e/64 (link)
Routes: 10.211.0.0/23 from 10.211.1.250 metric 100 (link)
fe80::/64 metric 256
```
Notice the lack of (dhcp) for the 10.211.1.250 address.
Running networkctl status enp181s0f0np0 yields
```
Link File: /usr/lib/systemd/network/99-default.link
Network File:
/run/systemd/network/10-netplan-enp181s0f0np0.network
State: routable (configured)
Online state: online
Type: ether
Path: pci-0000:b5:00.0
Driver: mlx5_core
Vendor: Mellanox Technologies
...
Auto negotiation: yes
Speed: 25Gbps
Duplex: full
Address: 10.211.1.250 (DHCP4 via 10.211.0.1)
fe80::5e25:73ff:fe64:119e
Activation Policy: up
Required For Online: yes
DHCP4 Client ID: IAID:0x33a8732/DUID
DHCP6 Client DUID: DUID-EN/Vendor:0000ab11825061d73ae2a6f4
Connected To: localhost on port Ethernet21/1
```
Investigating this further with tcpdump shows that the router is not
giving this interface a default gateway, and I was able to replicate
this on another network by specifically removing default gateway
assignment in the router page.
tcpdump output:
```
12:28:38.270403 IP (tos 0xc0, ttl 64, id 0, offset 0, flags [none], proto UDP
(17), length 324)
13:28:45 [165/258]
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from
5c:25:73:64:11:9e, length 296, xid 0x9eec5657, secs 1, Flags [none] (0x0000)
Client-Ethernet-Address 5c:25:73:64:11:9e
Vendor-rfc1048 Extensions
Magic Cookie ---
DHCP-Message (53), length 1: Discover
Client-ID (61), length 19: hardware-type 255,
03:3a:87:32:00:02:00:00:ab:11:82:50:61:d7:3a:e2:a6:f4
Parameter-Request (55), length 12:
Subnet-Mask (1), Default-Gateway (3), Domain-Name-Server (6),
Hostname (12)
Domain-Name (15), MTU (26), Static-Route (33), NTP (42)
URL (114), Unknown (119), Unknown (120), Classless-Static-Route
(121)
MSZ (57), length 2: 1472
SLP-NA (80), length 0""
Hostname (12), length 9: "---"
12:28:38.270754 IP (tos 0x10, ttl 128, id 0, offset 0, flags [DF], proto UDP
(17), length 322)
10.211.0.1.67 > 10.211.0.101.68: [udp sum ok] BOOTP/DHCP, Reply, length
294, xid 0x9eec5657, Flags [none] (0x0000)
Your-IP 10.211.0.101
Client-Ethernet-Address 5c:25:73:64:11:9e
Vendor-rfc1048 Extensions
Magic Cookie ---
Subnet-Mask (1), length 4: 255.255.254.0
Hostname (12), length 9: "---"
Lease-Time (51), length 4: 5184000
DHCP-Message (53), length 1: Offer
Server-ID (54), length 4: 10.211.0.1
Client-ID (61), length 19: hardware-type 255,
03:3a:87:32:00:02:00:00:ab:11:82:50:61:d7:3a:e2:a6:f4
```
I think this should be enough to track down the issue, but let me know
if I can provide anything else to help.
In summary, I would expect that applying a DHCP configuration to an
interface and running netplan status would properly return that the
address was received from a DHCP server.
** Affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2147446
Title:
Netplan status describes DHCP-configured interface with a static
address if no default gateway is provided
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