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

othiman othiman at gmx.de
Thu Sep 11 10:46:23 UTC 2014


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
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>
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