[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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>> lxc-users at lists.linuxcontainers.org
>> http://lists.linuxcontainers.org/listinfo/lxc-users
>
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