OpenStack neutron How to use tshark to capture packets from interface in the namespace

1)
Find all namespace
saju@ubuntu:~/openstack/devstack$ ip netns
qdhcp-2b42534a-b49f-45c4-9799-609978802299
qrouter-100af7f0-7d4c-4ece-bd58-22bfa09e1199
saju@ubuntu:~/openstack/devstack$
saju@ubuntu:~/openstack/devstack$

2)
Find all interfaces in the namespace "qdhcp-2b42534a-b49f-45c4-9799-609978802299"

saju@ubuntu:~/openstack/devstack$ sudo ip netns exec qdhcp-2b42534a-b49f-45c4-9799-609978802299 ifconfig
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:1 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:576 (576.0 B)  TX bytes:576 (576.0 B)

tap9ba0e606-87 Link encap:Ethernet  HWaddr fa:16:3e:c3:b2:34 
          inet addr:10.0.0.3  Bcast:10.0.0.255  Mask:255.255.255.0
          inet6 addr: fe80::f816:3eff:fec3:b234/64 Scope:Link
          UP BROADCAST RUNNING  MTU:1500  Metric:1
          RX packets:239 errors:0 dropped:0 overruns:0 frame:0
          TX packets:156 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:18918 (18.9 KB)  TX bytes:14867 (14.8 KB)
saju@ubuntu:~/openstack/devstack$
saju@ubuntu:~/openstack/devstack$


3)
Capture the packets from the interface "tap9ba0e606-87" in the namespace "qdhcp-2b42534a-b49f-45c4-9799-609978802299" using tshark

saju@ubuntu:~/openstack/devstack$ sudo ip netns exec qdhcp-2b42534a-b49f-45c4-9799-609978802299 tshark -i tap9ba0e606-87
tshark: Lua: Error during loading:
 [string "/usr/share/wireshark/init.lua"]:46: dofile has been disabled due to running Wireshark as superuser. See http://wiki.wireshark.org/CaptureSetup/CapturePrivileges for help in running Wireshark as an unprivileged user.
Running as user "root" and group "root". This could be dangerous.
Capturing on 'tap9ba0e606-87'
  1   0.000000     10.0.0.4 -> 10.0.0.3     ICMP 98 Echo (ping) request  id=0x04cf, seq=39/9984, ttl=64
  2   0.000199     10.0.0.3 -> 10.0.0.4     ICMP 98 Echo (ping) reply    id=0x04cf, seq=39/9984, ttl=64 (request in 1)
  3   0.297269   172.24.4.1 -> 10.0.0.3     ICMP 98 Echo (ping) request  id=0x4fc0, seq=61/15616, ttl=63
3   4   0.297373     10.0.0.3 -> 172.24.4.1   ICMP 98 Echo (ping) reply    id=0x4fc0, seq=61/15616, ttl=64 (request in 3)
  5   0.985129 fa:16:3e:c3:b2:34 -> fa:16:3e:62:bc:9b ARP 42 Who has 10.0.0.4?  Tell 10.0.0.3
5   6   0.988952 fa:16:3e:62:bc:9b -> fa:16:3e:c3:b2:34 ARP 42 10.0.0.4 is at fa:16:3e:62:bc:9b
  7   1.003747     10.0.0.4 -> 10.0.0.3     ICMP 98 Echo (ping) request  id=0x04cf, seq=40/10240, ttl=64
  8   1.003868     10.0.0.3 -> 10.0.0.4     ICMP 98 Echo (ping) reply    id=0x04cf, seq=40/10240, ttl=64 (request in 7)
  9   1.297265   172.24.4.1 -> 10.0.0.3     ICMP 98 Echo (ping) request  id=0x4fc0, seq=62/15872, ttl=63
 10   1.297403     10.0.0.3 -> 172.24.4.1   ICMP 98 Echo (ping) reply    id=0x4fc0, seq=62/15872, ttl=64 (request in 9)
10  11   2.007664     10.0.0.4 -> 10.0.0.3     ICMP 98 Echo (ping) request  id=0x04cf, seq=41/10496, ttl=64
11 ^C 12   2.007810     10.0.0.3 -> 10.0.0.4     ICMP 98 Echo (ping) reply    id=0x04cf, seq=41/10496, ttl=64 (request in 11)
12
1 packet dropped
saju@ubuntu:~/openstack/devstack$