[lxc-users] PARTIAL SOLUTION - Container Network no IP's, Unreachable - HELP

[Robert Pendell]

On Sun, May 18, 2014 at 2:05 AM, TuxRaiderPen wrote:
> On Sunday, May 18, 2014 01:16:05 TuxRaiderPen wrote:
>> I have a test system used for LXC which I've used for quite awhile with out
>> issue.
>>
>> Today I needed to use the containers on this system, and started them up,
>> did the usual to either ssh in or access things like phpMyAdmin etc..
>>
>> Couldn't access them.
>>
>> I can ping the lxcbr0 ip 10.0.3.1 from other computers on the LAN, no
>> issue.
>
> Ok.. after spending numerous  hours searching...
>
> It appears this is the problem...
>
> https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1254338
>
> SOLTUON
>
> Run this on the HOST
> sudo iptables -t mangle -A POSTROUTING -o lxcbr0 -p udp -m udp --dport 68 -j
> CHECKSUM --checksum-fill
>
> Rebooted one of the containers..
>
> WORKS! Crisis over.. data reachable.... back to work.. BUT.. long term...
>
> Is this related to some isc-dhcp change? And the containers need a sudo apt-
> get update/upgrade to fix  and thus the above won't be needed?
>
> Or for this box I need to put this into /etc/init/lxc-net.conf
>
> If so where?
>
> Is the iptables line the ONLY solution on 12.04 and 12.04 containers????
>
> Comments???
>
> Thanks.

Are you running any kind of software firewall at all?