[Bug 1288981] [NEW] Interfaces in the same namespace can not ping each other

Weiwen Chen wei-wen.chen at hp.com
Thu Mar 6 20:46:51 UTC 2014 

Public bug reported:

Seems like a bug as you can see the two interfaces in the same namespace
are not pingable. No iptables rule block on the system with Ubuntu
12.04.

# dpkg -l | grep -i route
ii  iproute                                   20111117-1ubuntu2.1                     networking and traffic control tools

# ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 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:16436  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)

qg-63628516-82 Link encap:Ethernet  HWaddr 44:44:44:b3:ea:d2
          inet addr:192.168.254.1  Bcast:192.168.254.255  Mask:255.255.255.0
          inet6 addr: fe80::4644:44ff:feb3:ead2/64 Scope:Link
          UP BROADCAST RUNNING  MTU:1500  Metric:1
          RX packets:15986 errors:0 dropped:13607 overruns:0 frame:0
          TX packets:238 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1275885 (1.2 MB)  TX bytes:18098 (18.0 KB)

qr-de498afa-fb Link encap:Ethernet  HWaddr 44:44:44:ce:a8:08
          inet addr:20.1.1.1  Bcast:20.1.1.255  Mask:255.255.255.0
          inet6 addr: fe80::4644:44ff:fece:a808/64 Scope:Link
          UP BROADCAST RUNNING  MTU:1500  Metric:1
          RX packets:15524 errors:0 dropped:14130 overruns:0 frame:0
          TX packets:825 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1227342 (1.2 MB)  TX bytes:76546 (76.5 KB)

root at hp-nn3:~# uname -a
Linux hp-nn3 3.5.0-37-generic #58~precise1-Ubuntu SMP Wed Jul 10 17:48:11 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

root at hp-nn3:~# ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 arp -a
? (20.1.1.3) at 44:44:44:a6:dd:3f [ether] on qr-de498afa-fb
? (192.168.254.254) at b4:b5:2f:58:31:00 [ether] on qg-63628516-82
root at hp-nn3:~# ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.254.254 0.0.0.0         UG    0      0        0 qg-63628516-82
20.1.1.0        0.0.0.0         255.255.255.0   U     0      0        0 qr-de498afa-fb
192.168.254.0   0.0.0.0         255.255.255.0   U     0      0        0 qg-63628516-82

root at hp-nn3:~# ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 ping -I qg-63628516-82 20.1.1.1
PING 20.1.1.1 (20.1.1.1) from 192.168.254.1 qg-63628516-82: 56(84) bytes of data.
>From 192.168.254.254 icmp_seq=1 Destination Host Prohibited
>From 192.168.254.254 icmp_seq=2 Destination Host Prohibited
# ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 ping -I qr-de498afa-fb 192.168.254.1
PING 192.168.254.1 (192.168.254.1) from 20.1.1.1 qr-de498afa-fb: 56(84) bytes of data.
>From 20.1.1.1 icmp_seq=1 Destination Host Unreachable
>From 20.1.1.1 icmp_seq=2 Destination Host Unreachable
>From 20.1.1.1 icmp_seq=3 Destination Host Unreachable

** Affects: iproute (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1288981

Title:
  Interfaces in the same namespace can not ping each other

Status in “iproute” package in Ubuntu:
  New

Bug description:
  Seems like a bug as you can see the two interfaces in the same
  namespace are not pingable. No iptables rule block on the system with
  Ubuntu 12.04.

  # dpkg -l | grep -i route
  ii  iproute                                   20111117-1ubuntu2.1                     networking and traffic control tools

  # ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 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:16436  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)

  qg-63628516-82 Link encap:Ethernet  HWaddr 44:44:44:b3:ea:d2
            inet addr:192.168.254.1  Bcast:192.168.254.255  Mask:255.255.255.0
            inet6 addr: fe80::4644:44ff:feb3:ead2/64 Scope:Link
            UP BROADCAST RUNNING  MTU:1500  Metric:1
            RX packets:15986 errors:0 dropped:13607 overruns:0 frame:0
            TX packets:238 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0
            RX bytes:1275885 (1.2 MB)  TX bytes:18098 (18.0 KB)

  qr-de498afa-fb Link encap:Ethernet  HWaddr 44:44:44:ce:a8:08
            inet addr:20.1.1.1  Bcast:20.1.1.255  Mask:255.255.255.0
            inet6 addr: fe80::4644:44ff:fece:a808/64 Scope:Link
            UP BROADCAST RUNNING  MTU:1500  Metric:1
            RX packets:15524 errors:0 dropped:14130 overruns:0 frame:0
            TX packets:825 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0
            RX bytes:1227342 (1.2 MB)  TX bytes:76546 (76.5 KB)

  root at hp-nn3:~# uname -a
  Linux hp-nn3 3.5.0-37-generic #58~precise1-Ubuntu SMP Wed Jul 10 17:48:11 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

  root at hp-nn3:~# ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 arp -a
  ? (20.1.1.3) at 44:44:44:a6:dd:3f [ether] on qr-de498afa-fb
  ? (192.168.254.254) at b4:b5:2f:58:31:00 [ether] on qg-63628516-82
  root at hp-nn3:~# ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 route -n
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  0.0.0.0         192.168.254.254 0.0.0.0         UG    0      0        0 qg-63628516-82
  20.1.1.0        0.0.0.0         255.255.255.0   U     0      0        0 qr-de498afa-fb
  192.168.254.0   0.0.0.0         255.255.255.0   U     0      0        0 qg-63628516-82

  root at hp-nn3:~# ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 ping -I qg-63628516-82 20.1.1.1
  PING 20.1.1.1 (20.1.1.1) from 192.168.254.1 qg-63628516-82: 56(84) bytes of data.
  From 192.168.254.254 icmp_seq=1 Destination Host Prohibited
  From 192.168.254.254 icmp_seq=2 Destination Host Prohibited
  # ip netns exec qrouter-561907b3-96b4-4f58-8f5b-0936cf5e1ee4 ping -I qr-de498afa-fb 192.168.254.1
  PING 192.168.254.1 (192.168.254.1) from 20.1.1.1 qr-de498afa-fb: 56(84) bytes of data.
  From 20.1.1.1 icmp_seq=1 Destination Host Unreachable
  From 20.1.1.1 icmp_seq=2 Destination Host Unreachable
  From 20.1.1.1 icmp_seq=3 Destination Host Unreachable

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