LXC guest cannot receive any packets

I am using vagrant-lxc, and it was working for a while, but one day it stop working. I tried using netctl for a while, but I switched the libvirt in the hopes of getting it working again, and it did... until I restarted
Here is the situation now.
On the guest:
root@vagrant-base-trusty-amd64:~# ping google.com
PING google.com (173.194.33.101) 56(84) bytes of data.
^C
--- google.com ping statistics ---
7 packets transmitted, 0 received, 100% packet loss, time 6007ms
root@vagrant-base-trusty-amd64:~# ip a
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
6: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 5e:61:d5:bf:7b:78 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.222/24 brd 192.168.122.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::5c61:d5ff:febf:7b78/64 scope link
valid_lft forever preferred_lft forever
root@vagrant-base-trusty-amd64:~# ip r
default via 192.168.122.1 dev eth0
192.168.122.0/24 dev eth0 proto kernel scope link src 192.168.122.222
root@vagrant-base-trusty-amd64:~# ping 192.168.122.1
PING 192.168.122.1 (192.168.122.1) 56(84) bytes of data.
64 bytes from 192.168.122.1: icmp_seq=1 ttl=64 time=0.076 ms
64 bytes from 192.168.122.1: icmp_seq=2 ttl=64 time=0.074 ms
64 bytes from 192.168.122.1: icmp_seq=3 ttl=64 time=0.097 ms
64 bytes from 192.168.122.1: icmp_seq=4 ttl=64 time=0.071 ms
^C
--- 192.168.122.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2998ms
rtt min/avg/max/mdev = 0.071/0.079/0.097/0.013 ms
root@vagrant-base-trusty-amd64:~# ping 192.168.1.100
PING 192.168.1.100 (192.168.1.100) 56(84) bytes of data.
64 bytes from 192.168.1.100: icmp_seq=1 ttl=64 time=0.082 ms
64 bytes from 192.168.1.100: icmp_seq=2 ttl=64 time=0.089 ms
64 bytes from 192.168.1.100: icmp_seq=3 ttl=64 time=0.102 ms
64 bytes from 192.168.1.100: icmp_seq=4 ttl=64 time=0.107 ms
^C
--- 192.168.1.100 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2999ms
rtt min/avg/max/mdev = 0.082/0.095/0.107/0.010 ms
root@vagrant-base-trusty-amd64:~# ping 192.168.1.101
PING 192.168.1.101 (192.168.1.101) 56(84) bytes of data.
^C
--- 192.168.1.101 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2007ms
root@vagrant-base-trusty-amd64:~# ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
^C
--- 192.168.1.1 ping statistics ---
9 packets transmitted, 0 received, 100% packet loss, time 8006ms
As you can see, DNS works and I can connect to the host.
On the host:
$ ip a
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: enp6s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet 192.168.1.100/24 brd 192.168.1.255 scope global dynamic enp6s0
valid_lft 97sec preferred_lft 97sec
3: enp8s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
4: virbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether xx:xx:xx:xx:xx:xx: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: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 500
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
7: vethG19V8K: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master virbr0 state UP group default qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc18:13ff:fe34:9591/64 scope link
valid_lft forever preferred_lft forever
$ ip r
default via 192.168.1.1 dev enp6s0 proto dhcp src 192.168.1.100 metric 1024
192.168.1.0/24 dev enp6s0 proto kernel scope link src 192.168.1.100
192.168.1.1 dev enp6s0 proto dhcp scope link src 192.168.1.100 metric 1024
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
$ sudo iptables -nvL --line-numbers
Chain INPUT (policy ACCEPT 930 packets, 1731K bytes)
num pkts bytes target prot opt in out source destination
1 586 72820 f2b-SSH tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
2 13 756 ACCEPT udp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:53
3 0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:53
4 5 1640 ACCEPT udp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:67
5 0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:67
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 0 0 ACCEPT all -- * virbr0 0.0.0.0/0 192.168.122.0/24 ctstate RELATED,ESTABLISHED
2 51 3503 ACCEPT all -- virbr0 * 192.168.122.0/24 0.0.0.0/0
3 0 0 ACCEPT all -- virbr0 virbr0 0.0.0.0/0 0.0.0.0/0
4 0 0 REJECT all -- * virbr0 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
5 0 0 REJECT all -- virbr0 * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
Chain OUTPUT (policy ACCEPT 846 packets, 70698 bytes)
num pkts bytes target prot opt in out source destination
1 5 1716 ACCEPT udp -- * virbr0 0.0.0.0/0 0.0.0.0/0 udp dpt:68
Chain f2b-SSH (1 references)
num pkts bytes target prot opt in out source destination
1 386 57808 RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
I tested that packets can get out using netcat to send UDP messages, and I received the messages on a server on the WAN, so I know packets are getting out, but they are not making it back.
I've tried removing lines 4 and 5 from the FORWARD chain, but it didn't help.

I had some weird issues with two Windows Server 2k8 R1 guests and networking between the two experiencing difficulties after some random amount of time. A reboot often fixes it for a short period of time, but then it comes back.
After a thorough investigation with Oracle Support, we didn't identify the root cause; however upgrading to Oracle VM 2.2.2 fixed the issue.
Edit: To clarify, my issues were that RDP and mapping network shares between the two servers wouldn't work... but communication to other non-OracleVM (and some Oracle VM guests as well actually) was fine.
Doing tcpdump traces on dom0 identified intermittent packet drops somewhere between the xenbrXX interface and the underlying network interface (e.g. in my case, bond0.XX).
Edited by: user10786594 on 20/01/2012 11:39

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