Arch Linux

Hansel

Member

Registered: 2024-11-25

Posts: 2

No NAT network connection on QEMU/KVM

Hi,
I'm using QEMU/KVM with Virt-Manager on Arch Linux, but the NAT network interface on both Windows 11 and macOS guests has no network connectivity.

Here is the output of 'ip addr' on my host:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: wwan0: <POINTOPOINT,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/[519] 
3: qemu: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether e6:5b:66:5a:0a:1f brd ff:ff:ff:ff:ff:ff
4: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 04:7b:cb:c5:bf:34 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.4/24 brd 192.168.1.255 scope global dynamic noprefixroute wlan0
       valid_lft 27476sec preferred_lft 27476sec
    inet6 fe80::c257:3f2:f2f2:701a/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
5: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:2d:59:ee brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever

Here is the output of 'ipconfig /all' on the Windows 11 guest:

Windows IP Configuration

   Host Name . . . . . . . . . . . . : windowsvm
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Ethernet 0 4:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Red Hat VirtIO Ethernet Adapter #2
   Physical Address. . . . . . . . . : 52-54-00-56-A0-15
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::d126:e454:17c1:4c13%3(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.122.85(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . :
   DHCP Server . . . . . . . . . . . : 192.168.122.1
   DHCPv6 IAID . . . . . . . . . . . : 290608128
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-2E-E7-5E-EA-52-54-00-D2-10-68
   DNS Servers . . . . . . . . . . . : 192.168.122.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

my 'virsh net-list --all' output:

 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              active     yes            yes

I’m new to virtualization on Linux, so please let me know if I should provide any additional information.
Also, I think it’s worth mentioning that I’m not using the monolithic libvirtd.service daemon, but the modular ones (virtqemud.service, virtinterfaced.service, virtnetworkd.service).

serat

Member

Registered: 2020-01-19

Posts: 31

Re: No NAT network connection on QEMU/KVM

Might not be related since I'm not using virt-manager. But a recent qemu version broke my networking setup as well (https://bbs.archlinux.org/viewtopic.php?id=302187). Maybe try downgrading to qemu 9.1.2-1?

Last edited by serat (2024-12-30 03:49:06)