Where is the Virtual machine getting the 10.0.2.15 IP address from? I don't have a DHCP server handing out 10.0.2.0/24 IP addresses on my network. Thank you for any help!

Here is my Information

Virtual Machine Manager running on nobara/Fedora

LXC
Name: default
Device: virbr0
State: Active
Autostat: ON Boot
IPv4 configuration
Network: 192.168.122.0/24
DHCP range: 192.168.122.2 - 192.168.122.254
Forwarding: NAT
----------------------------------------------------------------
Virtual Machine Information
OS: ubuntu22.04
NIC Network Source: Usermode networking
Device model: virtio
MAC Address: 52:54:00:25:83:af
IP address: Unknown (With LXC Connected or Disconnected)
Link state: active
----------------------------------------------------------------
Virtual Bride Interface

virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:85:f5:94 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global noprefixroute virbr0
valid_lft forever preferred_lft forever
----------------------------------------------------------------
Virtual Machine - ubuntu22.04
ip addr

enp1s0:
link/ether 52:54:00:25:83:af brd ff:ff:ff:ff:ff:ff
IP Address: Automatic
DNS: Automatic
DHCP assigned IP Address: 10.0.2.15/24
Broadcast 10.0.2.255
Virtual Machine - ubuntu22.04

Can ping PC Local bridge0 interface IP address of 192.168.25.4 <State UP>
Can ping PC virbr0 interface IP address 192.168.122.1 <State DOWN>
no vnet interface on local PC
----------------------------------------------------------------
sudo brctl show
bridge name bridge id STP enabled interfaces
bridge0 8000.facb0d19e3ba no enp0s25
virbr0 8000.52540085f594 yes

After taking the red pill and going down the rabbit hole I was able to discover why my virtual clients in Virtual Machine Manager where getting 10.2.x.x.x IP address from QEMU itself. I disabled LXC in Virtual Machine Manager and setup a virtual bridge on my nobara PC. I now have all my virtual machines talking to each other along with my local PC, using the virtual bridge br0. I found these two YouTube videos extremely helpful!
Now back to drinking some more tea!

QEMU Virtual Machine

QEMU - Bridged Networking

1 members found this post helpful.

Interesting: Oracle Virtualbox hands out the exact same IP when you have it set to NAT.

maw_walker is right. This is a NAT (Network Address Translation) address.

Here's a good intro to NAT.