NAT isn't working in qemu-kvm VM

[Adam Williamson]

On Fri, 2015-05-22 at 14:29 -0600, Chris Murphy wrote:
> This has been working this whole test cycle until today and now I'm
> stumped that it's not working.
> 
> On the host:
> [root at f22m]# ip addr
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
> group default
>     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: enp2s0f0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq
> state DOWN group default qlen 1000
>     link/ether c8:2a:14:02:88:99 brd ff:ff:ff:ff:ff:ff
> 3: wlp3s0b1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc 
> fq_codel
> state UP group default qlen 1000
>     link/ether e0:f8:47:39:5d:de brd ff:ff:ff:ff:ff:ff
>     inet 192.168.1.128/24 brd 192.168.1.255 scope global dynamic 
> wlp3s0b1
>        valid_lft 84895sec preferred_lft 84895sec
>     inet6 fe80::e2f8:47ff:fe39:5dde/64 scope link
>        valid_lft forever preferred_lft forever
> 4: virbr0 at NONE: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
> noqueue state UP group default
>     link/ether 52:54:00:dd:30:37 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
> 5: virbr0-nic at NONE: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel
> master virbr0 state DOWN group default qlen 500
>     link/ether 52:54:00:dd:30:37 brd ff:ff:ff:ff:ff:ff
> 7: vnet0 at NONE: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
> fq_codel master virbr0 state UNKNOWN group default qlen 500
>     link/ether fe:54:00:6d:40:9e brd ff:ff:ff:ff:ff:ff
>     inet6 fe80::fc54:ff:fe6d:409e/64 scope link
>        valid_lft forever preferred_lft forever
> 
> 
> On the guest:
> [root at f22v]# ip addr
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
> group default
>     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: ens8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel
> state UP group default qlen 1000
>     link/ether 52:54:00:6d:40:9e brd ff:ff:ff:ff:ff:ff
>     inet 192.168.122.103/24 brd 192.168.122.255 scope global dynamic 
> ens8
>        valid_lft 3198sec preferred_lft 3198sec
>     inet6 fe80::5054:ff:fe6d:409e/64 scope link
>        valid_lft forever preferred_lft forever
> 3: virbr0 at NONE: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc
> noqueue state LOWERLAYERDOWN group default
>     link/ether 52:54:00:25:45:a5 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
> 4: virbr0-nic at NONE: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel
> master virbr0 state DOWN group default qlen 500
>     link/ether 52:54:00:25:45:a5 brd ff:ff:ff:ff:ff:ff

Late reply, but this looks like a classic case of 
https://bugzilla.redhat.com/show_bug.cgi?id=1146284 / 
https://bugzilla.redhat.com/show_bug.cgi?id=1146232 . Taking down
virbr0 in the guest should solve it.
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net