[Lxc-users] Routing from lxc guest to a directly connected network to host.

[Luis M. Ibarra]

Hi Tony,

I forgort to add the ip addresses of the host and the guest:

Host: 192.168.5.154
Guest: 192.168.5.215
GW connected to Internet: 192.168.5.1

Tony, you were right, I just tested and the host it's connecting to all the
192.168.5.0 using 192.168.5.154 as a default gateway. However, I can't ping
or make a connection to any host in the 192.168.1.0 from the guest.

lxc HOST routing table:

#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
192.168.5.0     0.0.0.0         255.255.255.0   U     0      0        0 br0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
0.0.0.0         192.168.5.1     0.0.0.0             UG    0      0        0
br0

Testing from the HOST to 192.168.1.0 network:
#ping 192.168.1.21
PING 192.168.1.21 (192.168.1.41) 56(84) bytes of data.
64 bytes from 192.168.1.21: icmp_seq=1 ttl=64 time=0.148 ms
64 bytes from 192.168.1.21: icmp_seq=2 ttl=64 time=0.104 ms
64 bytes from 192.168.1.21: icmp_seq=3 ttl=64 time=0.110 ms
^C
--- 192.168.1.21 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2429ms
rtt min/avg/max/mdev = 0.104/0.120/0.148/0.023 ms


GUEST routing table:
# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags    Metric   Ref
Use Iface
192.168.5.0     0.0.0.0         255.255.255.0      U           0
0        0      eth0
169.254.0.0     0.0.0.0         255.255.0.0          U           1002
0        0      eth0
0.0.0.0       192.168.5.154     0.0.0.0                UG          0
0        0      eth0


Testing from the GUEST to 192.168.1.0 network:
#ping 192.168.1.21
PING 192.168.1.21 (192.168.1.21) 56(84) bytes of data.
^C
--- 192.168.1.41 ping statistics ---
90 packets transmitted, 0 received, 100% packet loss, time 89100ms


2013/7/25 Tony Su <tonysu at su-networking.com>

> Hello Luis,
> Your host routing table specifically identifies the DGW as 192.168.5.1
> (the last line)
>
> why would you think you could "go anywhere" without a  DGW?
>
> Tony
>



> On Jul 25, 2013 7:08 AM, "Luis M. Ibarra" <michael.ibarra at gmail.com>
> wrote:
>
>> Hi everybody,
>>
>> I run over this issue. I have an lxc host with this routing table:
>>
>> #route -n
>> Kernel IP routing table
>> Destination     Gateway         Genmask         Flags Metric Ref    Use
>> Iface
>> 192.168.5.0     0.0.0.0         255.255.255.0   U     0      0        0
>> br0
>> 192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0
>> eth1
>> 0.0.0.0         192.168.5.1     0.0.0.0         UG    0      0        0
>> br0
>>
>> and
>> #cat /proc/sys/net/ipv4/ip_forward
>> 1
>>
>>
>> and an lxc guest with:
>> # route -n
>> Kernel IP routing table
>> Destination     Gateway         Genmask         Flags    Metric   Ref
>> Use Iface
>> 192.168.5.0     0.0.0.0         255.255.255.0      U           0
>> 0        0      eth0
>> 169.254.0.0     0.0.0.0         255.255.0.0          U           1002
>> 0        0      eth0
>> 0.0.0.0       192.168.5.154     0.0.0.0                UG
>> 0        0        0      eth0
>>
>> with this configuration packets can't go anywhere. If I change the
>> default gw of the lxc guest to 192.158.5.1 at least I get all the network
>> 192.158.5.0.
>>
>> My question, why am I missing to get this working?
>>
>>
>>
>>
>> --
>> Luis M. Ibarra
>>
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>>


-- 
Luis M. Ibarra
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