Ping does not work on L2TPv3 tunnel

Question

Hi, I have a simple lab setup for testing the L2TPv3. Diagram is attached.
The router simulated PCs (192.168.10.1 and 192.168.10.2) just can not ping each other. Here below are the comfiguration of the 2 routers. I tried to put in "ip pmtu" under pseudowire-class; I tried to adjust-mss under interface of the two router simulated PCs to 1400 or even 1360, none of them changed a thing. 
Please advise.
+++++++++++++++R1++++++++++++++++++
hostname R1
interface Loopback0
 ip address 10.0.1.1 255.255.255.255
interface FastEthernet 1/1
 ip address 4.2.2.1 255.255.255.0
 no shut
router ospf 1
 router-id 10.0.1.1
 network 0.0.0.0 255.255.255.255 area 0
l2tp-class L2TPV3class
 authentication
 password L2TPV3
 retransmit initial retries 30
 cookie size 8
pseudowire-class HQ2R2
 encapsulation l2tpv3
 protocol none
 ip local interface Loopback0
default inter fa1/0
interface FastEthernet1/0
 description HQ_LAN_R2Branch
 no ip address
 no shut
 no cdp enable
 xconnect 10.0.2.2 102 encapsulation l2tpv3 manual pw-class HQ2R2
 l2tp id 101 200
 l2tp cookie local 4 221200
 l2tp cookie remote 4 122200
 l2tp hello L2TPV3class
+++++++++++++++R2++++++++++++++++++
hostname R2
interface Loopback0
 ip address 10.0.2.2 255.255.255.255
interface FastEthernet 1/0
 ip address 4.2.2.2 255.255.255.0
 no shut
router ospf 1
 router-id 10.0.2.2
 network 0.0.0.0 255.255.255.255 area 0
l2tp-class L2TPV3class
authentication
password L2TPV3
retransmit initial retries 30
cookie size 8
pseudowire-class R2Branch2HQ
encapsulation l2tpv3
protocol none
ip local interface Loopback0
ip pmtu
default inter fa0/0
interface FastEthernet0/0
description R2Branch_LAN_HQ
no ip address
no shut
no cdp enable
xconnect 10.0.1.1 201 encapsulation l2tpv3 manual pw-class R2Branch2HQ
l2tp id 200 101
l2tp cookie local 4 221200
l2tp cookie remote 4 122200
l2tp hello L2TPV3class

Answer 1

I'm having similar trouble on itunes for OSX.
For the last 5 days i've had:
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It works okay now on my iPhone 3GS but did error a few times 2 days ago.