Xen: Can't ping from domU to dom0

I have 2 local connected PCs. I'v created 2 VMs on PC1 and added connection through bridging using eth0 interface in dom0.

From dom0: 

#brctl addbr xenbr0
#brctl addif xenbr0 eth0
#ifconfig xenbr0 10.0.2.4
#xl create /etc/xen/dom1.cfg
#xl create /etc/xen/dom2.cfg

#ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0A:35:00:22:01
          inet addr:10.0.2.1  Bcast:10.255.255.255  Mask:255.0.0.0
          inet6 addr: fe80::20a:35ff:fe00:2201/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:228 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1228 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:36193 (35.3 KiB)  TX bytes:407300 (397.7 KiB)
          Interrupt:25

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:5 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 B)  TX bytes:560 (560.0 B)

vif2.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:2524 (2.4 KiB)  TX bytes:2558 (2.4 KiB)

vif3.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:1212 (1.1 KiB)  TX bytes:1165 (1.1 KiB)

xenbr0    Link encap:Ethernet  HWaddr 00:0A:35:00:22:01
          inet addr:10.0.2.3  Bcast:10.255.255.255  Mask:255.0.0.0
          inet6 addr: fe80::20a:35ff:fe00:2201/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:20 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4224 (4.1 KiB)  TX bytes:648 (648.0 B)

In the Xen cfg files I have this line "vif = [ 'script=vif-bridge, bridge=xenbr0' ]"

From domU

#ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:3E:60:FC:91
          inet addr:10.0.2.6  Bcast:10.255.255.255  Mask:255.0.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:94 errors:0 dropped:0 overruns:0 frame:0
          TX packets:68 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:23886 (23.3 KiB)  TX bytes:22500 (21.9 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

After booting to guest VMs I have the following ping statuses:

• Ping between domUs is OK.
• Ping between domUs and PC2 is OK.
• Ping from domU to dom0(PC1) is not OK!

Thank you for your time and help!