[lxc-users] No outgoing traffic with bridged network and public IP address from container

Tamas Papp tompos at martos.bme.hu
Thu Sep 11 11:01:25 UTC 2014


hi,

Is it allowed by your provider?

tamas

On 09/11/2014 12:46 PM, othiman wrote:
> Hi Andreas, hi tamas,
>
> thanks for your fast answers. I removed the IP settings from the 
> config, but that was obviously not the problem.
>
> I cannot ping the gateway from inside of the container:
> ubuntu at ubuntu-test:~$ ping 91.143.88.1
> PING 91.143.88.1 (91.143.88.1) 56(84) bytes of data.
> ^C
> --- 91.143.88.1 ping statistics ---
> 4 packets transmitted, 0 received, 100% packet loss, time 3023ms
>
> Meanwhile I used "tcpdump -i eth0 -v icmp -n" on the host to look at 
> the ICMP packets (because there is a lot of other traffic on that 
> device).
>
> tcpdump: WARNING: eth0: no IPv4 address assigned
> tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 
> 65535 bytes
> 11:46:27.181917 IP (tos 0x0, ttl 244, id 28226, offset 0, flags 
> [none], proto ICMP (1), length 84)
>     176.227.209.42 > 81.7.14.108: ICMP echo request, id 263, seq 
> 31682, length 64
> 11:46:27.401801 IP (tos 0x0, ttl 64, id 48628, offset 0, flags [DF], 
> proto ICMP (1), length 84)
>     91.143.88.119 > 91.143.88.1: ICMP echo request, id 457, seq 1, 
> length 64
> 11:46:28.409373 IP (tos 0x0, ttl 64, id 48629, offset 0, flags [DF], 
> proto ICMP (1), length 84)
>     91.143.88.119 > 91.143.88.1: ICMP echo request, id 457, seq 2, 
> length 64
> 11:46:29.417370 IP (tos 0x0, ttl 64, id 48630, offset 0, flags [DF], 
> proto ICMP (1), length 84)
>     91.143.88.119 > 91.143.88.1: ICMP echo request, id 457, seq 3, 
> length 64
> 11:46:30.425366 IP (tos 0x0, ttl 64, id 48631, offset 0, flags [DF], 
> proto ICMP (1), length 84)
>     91.143.88.119 > 91.143.88.1: ICMP echo request, id 457, seq 4, 
> length 64
> 11:46:31.383279 IP (tos 0x0, ttl 244, id 29380, offset 0, flags 
> [none], proto ICMP (1), length 84)
>     176.227.209.42 > 81.7.14.108: ICMP echo request, id 263, seq 
> 32673, length 64
> ^C
> 6 packets captured
> 6 packets received by filter
> 0 packets dropped by kernel
>
>
> So it looks like the packets are going out, but there is no answer 
> coming back. So I tried Andreas hint. I called (in the container)
>
> ubuntu at ubuntu-test:~$ sudo ./arping -I eth0 -u 91.143.88.119 -c4
> ARPING 91.143.88.119
>
> --- 91.143.88.119 statistics ---
> 4 packets transmitted, 0 packets received, 100% unanswered (0 extra)
>
> But still no answers from the gateway :-(
>
> Best regards,
> Thomas
>
> On 11.09.2014 11:20, Andreas Laut wrote:
>> We face this problem very often.
>>
>> You can try to ping the Host IP and after that the gateway IP from
>> inside the container.
>> If that doesn't work you'll have to send arpings from inside the 
>> conainter:
>> arping -I [lxc-interfacename]  -U 91.143.88.119 -c4 (arping from iputils
>> package)
>>
>> After that you'll get the following output:
>> Sent 4 probes (4 broadcast(s))
>> Received 0 response(s)
>>
>> 0 responses are ok. Try to ping again.
>> Hope that helps.
>>
>> Best Regards
>>
>>
>>
>> Am 11.09.2014 um 11:05 schrieb othiman:
>>> Hi everyone,
>>>
>>> I already posted this to askubuntu.com
>>> (http://askubuntu.com/questions/522457/lxc-container-no-outgoing-traffic-with-bridged-network-and-public-ip-address), 
>>>
>>> but I think this might be a better place to find help.
>>>
>>> I try to setup a LXC container with bridged network on ubuntu 14.04.1,
>>> but the outgoing traffic seems to be blocked. Ping another IP than the
>>> container's one is not working. Actually I tried this with a working
>>> container of a ubuntu 12.04 host moved to new hardware and a recent
>>> ubuntu 14.04, but the problem also applies to a new created ubuntu
>>> 14.04 container.
>>>
>>> I should mention that if I bind the IP address to an aliasing
>>> interface of the host directly, pinging inside and outside to the host
>>> is working correctly.
>>>
>>> I hope someone has an idea what I am doing wrong.
>>>
>>>
>>> I created a the new container with:
>>>      lxc-create -t ubuntu -n ubuntu-test
>>>
>>>
>>> This is my config file:
>>>      # Template used to create this container:
>>> /usr/share/lxc/templates/lxc-ubuntu
>>>      # Parameters passed to the template: -r trusty
>>>      # For additional config options, please look at 
>>> lxc.container.conf(5)
>>>
>>>      # Common configuration
>>>      lxc.include = /usr/share/lxc/config/ubuntu.common.conf
>>>
>>>      # Container specific configuration
>>>      lxc.rootfs = /var/lib/lxc/ubuntu-test/rootfs
>>>      lxc.mount = /var/lib/lxc/ubuntu-test/fstab
>>>      lxc.utsname = ubuntu-test
>>>      lxc.arch = amd64
>>>
>>>      # Network configuration
>>>      lxc.network.type = veth
>>>      lxc.network.flags = up
>>>      lxc.network.link = br0
>>>      lxc.network.hwaddr = 00:16:3e:6c:7c:79
>>>      lxc.network.ipv4=91.143.88.119/24
>>>      lxc.network.ipv4.gateway=91.143.88.1
>>>      lxc.network.name=eth0
>>>
>>>
>>> My '/etc/network/interfaces' on the host:
>>>      auto lo
>>>      iface lo inet loopback
>>>
>>>      auto br0
>>>      iface br0 inet static
>>>          address 81.7.15.233
>>>          netmask 255.255.255.0
>>>          broadcast 81.7.15.255
>>>          gateway 81.7.15.1
>>>          bridge_ports eth0
>>>          bridge_fd 0
>>>          bridge_stp off
>>>          bridge_waitport 0
>>>          bridge_maxwait 0
>>>
>>>
>>> and on the client:
>>>      auto lo
>>>      iface lo inet loopback
>>>
>>>      auto eth0
>>>      iface eth0 inet static
>>>          address 91.143.88.119
>>>          netmask 255.255.255.0
>>>          broadcast 91.143.88.255
>>>          gateway 91.143.88.1
>>>
>>>
>>> IP forwarding is enabled:
>>>      cat /proc/sys/net/ipv4/ip_forward
>>>      1
>>>
>>>
>>> 'iptables-save' shows
>>>      # Generated by iptables-save v1.4.21 on Wed Sep 10 18:26:23 2014
>>>      *mangle
>>>      :PREROUTING ACCEPT [20035:4192692]
>>>      :INPUT ACCEPT [7193:3225426]
>>>      :FORWARD ACCEPT [2677:191017]
>>>      :OUTPUT ACCEPT [381:36624]
>>>      :POSTROUTING ACCEPT [3058:227641]
>>>      -A POSTROUTING -o lxcbr0 -p udp -m udp --dport 68 -j CHECKSUM
>>> --checksum-fill
>>>      COMMIT
>>>      # Completed on Wed Sep 10 18:26:23 2014
>>>      # Generated by iptables-save v1.4.21 on Wed Sep 10 18:26:23 2014
>>>      *nat
>>>      :PREROUTING ACCEPT [10474:819973]
>>>      :INPUT ACCEPT [282:41644]
>>>      :OUTPUT ACCEPT [7:537]
>>>      :POSTROUTING ACCEPT [57:4274]
>>>      -A POSTROUTING -s 10.0.3.0/24 ! -d 10.0.3.0/24 -j MASQUERADE
>>>      COMMIT
>>>      # Completed on Wed Sep 10 18:26:23 2014
>>>      # Generated by iptables-save v1.4.21 on Wed Sep 10 18:26:23 2014
>>>      *filter
>>>      :INPUT ACCEPT [7193:3225426]
>>>      :FORWARD ACCEPT [2677:191017]
>>>      :OUTPUT ACCEPT [381:36624]
>>>      -A INPUT -i lxcbr0 -p tcp -m tcp --dport 53 -j ACCEPT
>>>      -A INPUT -i lxcbr0 -p udp -m udp --dport 53 -j ACCEPT
>>>      -A INPUT -i lxcbr0 -p tcp -m tcp --dport 67 -j ACCEPT
>>>      -A INPUT -i lxcbr0 -p udp -m udp --dport 67 -j ACCEPT
>>>      -A FORWARD -o lxcbr0 -j ACCEPT
>>>      -A FORWARD -i lxcbr0 -j ACCEPT
>>>      COMMIT
>>>      # Completed on Wed Sep 10 18:26:23 2014
>>>
>>>
>>> output of 'brctl show':
>>>      bridge name    bridge id        STP enabled    interfaces
>>>      br0            8000.0025905700f8    no        eth0
>>>                                              vethRTX30H
>>>      lxcbr0        8000.000000000000    no
>>>
>>>
>>> My host's 'ifconfig':
>>>      br0       Link encap:Ethernet  Hardware Adresse 00:25:90:57:00:f8
>>>            inet Adresse:81.7.15.233  Bcast:81.7.15.255 
>>> Maske:255.255.255.0
>>>            inet6-Adresse: fe80::225:90ff:fe57:f8/64
>>> Gültigkeitsbereich:Verbindung
>>>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
>>>            RX-Pakete:128248 Fehler:0 Verloren:15 Überläufe:0 Fenster:0
>>>            TX-Pakete:3835 Fehler:0 Verloren:0 Überläufe:0 Träger:0
>>>            Kollisionen:0 Sendewarteschlangenlänge:0
>>>            RX-Bytes:11076138 (11.0 MB)  TX-Bytes:343557 (343.5 KB)
>>>
>>>      eth0      Link encap:Ethernet  Hardware Adresse 00:25:90:57:00:f8
>>>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
>>>            RX-Pakete:129421 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
>>>            TX-Pakete:4046 Fehler:0 Verloren:0 Überläufe:0 Träger:0
>>>            Kollisionen:0 Sendewarteschlangenlänge:1000
>>>            RX-Bytes:13510902 (13.5 MB)  TX-Bytes:449527 (449.5 KB)
>>>            Interrupt:16 Speicher:fb900000-fb920000
>>>
>>>      lo        Link encap:Lokale Schleife
>>>            inet Adresse:127.0.0.1  Maske:255.0.0.0
>>>            inet6-Adresse: ::1/128 Gültigkeitsbereich:Maschine
>>>            UP LOOPBACK RUNNING  MTU:65536  Metrik:1
>>>            RX-Pakete:2 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
>>>            TX-Pakete:2 Fehler:0 Verloren:0 Überläufe:0 Träger:0
>>>            Kollisionen:0 Sendewarteschlangenlänge:0
>>>            RX-Bytes:176 (176.0 B)  TX-Bytes:176 (176.0 B)
>>>
>>>      lxcbr0    Link encap:Ethernet  Hardware Adresse ae:2c:57:c2:f0:24
>>>            inet Adresse:10.0.3.1  Bcast:10.0.3.255 Maske:255.255.255.0
>>>            inet6-Adresse: fe80::ac2c:57ff:fec2:f024/64
>>> Gültigkeitsbereich:Verbindung
>>>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
>>>            RX-Pakete:0 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
>>>            TX-Pakete:8 Fehler:0 Verloren:0 Überläufe:0 Träger:0
>>>            Kollisionen:0 Sendewarteschlangenlänge:0
>>>            RX-Bytes:0 (0.0 B)  TX-Bytes:648 (648.0 B)
>>>
>>>      vethRTX30H Link encap:Ethernet  Hardware Adresse fe:97:2b:8e:90:8a
>>>            inet6-Adresse: fe80::fc97:2bff:fe8e:908a/64
>>> Gültigkeitsbereich:Verbindung
>>>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
>>>            RX-Pakete:39 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
>>>            TX-Pakete:14826 Fehler:0 Verloren:0 Überläufe:0 Träger:0
>>>            Kollisionen:0 Sendewarteschlangenlänge:1000
>>>            RX-Bytes:3282 (3.2 KB)  TX-Bytes:1466740 (1.4 MB)
>>>
>>>
>>> My container's 'ifconfig'
>>>      eth0      Link encap:Ethernet  Hardware Adresse 00:16:3e:6c:7c:79
>>>            inet Adresse:91.143.88.119  Bcast:91.143.88.255
>>> Maske:255.255.255.0
>>>            inet6-Adresse: fe80::216:3eff:fe6c:7c79/64
>>> Gültigkeitsbereich:Verbindung
>>>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
>>>            RX-Pakete:20082 Fehler:0 Verloren:2 Überläufe:0 Fenster:0
>>>            TX-Pakete:40 Fehler:0 Verloren:0 Überläufe:0 Träger:0
>>>            Kollisionen:0 Sendewarteschlangenlänge:1000
>>>            RX-Bytes:2005479 (2.0 MB)  TX-Bytes:3368 (3.3 KB)
>>>
>>>      lo        Link encap:Lokale Schleife
>>>            inet Adresse:127.0.0.1  Maske:255.0.0.0
>>>            inet6-Adresse: ::1/128 Gültigkeitsbereich:Maschine
>>>            UP LOOPBACK RUNNING  MTU:65536  Metrik:1
>>>            RX-Pakete:0 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
>>>            TX-Pakete:0 Fehler:0 Verloren:0 Überläufe:0 Träger:0
>>>            Kollisionen:0 Sendewarteschlangenlänge:0
>>>            RX-Bytes:0 (0.0 B)  TX-Bytes:0 (0.0 B)
>>>
>>>
>>> 'tail /proc/sys/net/bridge/*' on the host
>>>      ==> /proc/sys/net/bridge/bridge-nf-call-arptables <==
>>>      0
>>>
>>>      ==> /proc/sys/net/bridge/bridge-nf-call-ip6tables <==
>>>      0
>>>
>>>      ==> /proc/sys/net/bridge/bridge-nf-call-iptables <==
>>>      0
>>>
>>>      ==> /proc/sys/net/bridge/bridge-nf-filter-pppoe-tagged <==
>>>      0
>>>
>>>      ==> /proc/sys/net/bridge/bridge-nf-filter-vlan-tagged <==
>>>      0
>>>
>>>      ==> /proc/sys/net/bridge/bridge-nf-pass-vlan-input-dev <==
>>>      0
>>>
>>>
>>> finally 'ping 8.8.8.8' in the container:
>>>      PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
>>>      ^C
>>>      --- 8.8.8.8 ping statistics ---
>>>      3 packets transmitted, 0 received, 100% packet loss, time 2015ms
>>>
>>> Best regards,
>>> Thomas
>>> _______________________________________________
>>> lxc-users mailing list
>>> lxc-users at lists.linuxcontainers.org
>>> http://lists.linuxcontainers.org/listinfo/lxc-users
>>
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