Networking is broken in WSL2?

[Maxim-Mazurok]

I have installed podman inside WSL2 latest Ubuntu using sudo apt install podman.
It works fine, but when it comes to networking - I can't seem to connect to the host IP.
In docker I was using http://host.docker.internal, now I'm using http://host.containers.internal but it doesn't work.

Inside of container I'm getting this:

root@ca5e73ca9964:/# curl -vvv http://host.containers.internal:3000
*   Trying 10.0.2.2:3000...
* connect to 10.0.2.2 port 3000 failed: Network is unreachable
* Failed to connect to host.containers.internal port 3000: Network is unreachable
* Closing connection 0
curl: (7) Failed to connect to host.containers.internal port 3000: Network is unreachable

this is my resolve:

root@ca5e73ca9964:/# cat /etc/resolv.conf
nameserver 10.0.2.3
nameserver 192.168.144.1

ifconfig in container:

root@ca5e73ca9964:/# ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 38  bytes 57525 (56.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 38  bytes 57525 (56.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

tap0: flags=67<UP,BROADCAST,RUNNING>  mtu 65520
        inet 10.0.2.100  netmask 255.255.255.0  broadcast 10.0.2.255
        inet6 fe80::b098:e6ff:fe94:c8e6  prefixlen 64  scopeid 0x20<link>
        ether b2:98:e6:94:c8:e6  txqueuelen 1000  (Ethernet)
        RX packets 142  bytes 766482 (748.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 145  bytes 14171 (13.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ifconfig in host (WSL):

maxim@64QHKR3:~$ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.152.10  netmask 255.255.240.0  broadcast 192.168.159.255
        inet6 fe80::215:5dff:fe3e:362b  prefixlen 64  scopeid 0x20<link>
        ether 00:15:5d:3e:36:2b  txqueuelen 1000  (Ethernet)
        RX packets 101864  bytes 319613585 (319.6 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 80238  bytes 2687905119 (2.6 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 30764  bytes 113654492 (113.6 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 30764  bytes 113654492 (113.6 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

maxim@64QHKR3:~$ podman unshare ip addr
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
       valid_lft forever preferred_lft forever
2: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 9a:bf:89:85:2f:63 brd ff:ff:ff:ff:ff:ff
3: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 3e:2e:ab:90:38:10 brd ff:ff:ff:ff:ff:ff
4: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:15:5d:3e:36:2b brd ff:ff:ff:ff:ff:ff
    inet 192.168.152.10/20 brd 192.168.159.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::215:5dff:fe3e:362b/64 scope link
       valid_lft forever preferred_lft forever
5: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/ipip 0.0.0.0 brd 0.0.0.0
6: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/sit 0.0.0.0 brd 0.0.0.0

maxim@64QHKR3:~$ podman unshare --rootless-cni ip addr
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
       valid_lft forever preferred_lft forever
2: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/ipip 0.0.0.0 brd 0.0.0.0
3: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/sit 0.0.0.0 brd 0.0.0.0
4: tap0: <BROADCAST,UP,LOWER_UP> mtu 65520 qdisc fq_codel state UNKNOWN group default qlen 1000
    link/ether e2:fc:fb:b4:f9:12 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.100/24 brd 10.0.2.255 scope global tap0
       valid_lft forever preferred_lft forever
    inet6 fe80::e0fc:fbff:feb4:f912/64 scope link tentative
       valid_lft forever preferred_lft forever

Any ideas why it doesn't work? Thank you!

[davdr]

Which Podman version are you running? If I recall correctly, up to a certain point (Podman 4.0? 4.1?) the IP address returned for host.containers.internal was wrong, and it looks likt it's the case here, too. Podman 4.2's podman-machine return the WSL2 distro's eth0 address:

PS C:\> podman machine start
PS C:\> podman machine ssh ip a sh eth0
6: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
...
    inet 172.18.237.164/20 brd 172.18.239.255 scope global eth0
...
PS C:\> podman machine ssh hostname -I
172.18.237.164
PS C:\> podman run --rm -it docker.io/library/alpine:latest ping host.containers.internal
PING host.containers.internal (172.18.237.164): 56 data bytes
^C

In your case, this should be 192.168.152.10 instead of the 10.0.2.2 you got.

[Maxim-Mazurok]

I didn't realize that Ubuntu has such an outdated podman version... I've been using v3.4.4, switching to Kubic repo now.

[Maxim-Mazurok]

After updating to 4.2.1 it works perfectly fine, thank you!