[Samba] diconnections when using roaming-profiles with samba4

Rowland Penny rowlandpenny at googlemail.com
Fri Sep 5 13:19:31 MDT 2014

On 05/09/14 20:04, bugblatterbeast wrote:
> Hello Chan Min Wai,
> feel free to ask, if you need more information.
> Our problem was, that our workstations lost their network-connection for
> a few seconds at irregular intervals. This did not happen simultaneously
> and some workstations were more affected than others. At first I thought
> the problem was related to samba. It was almost unnoticeable, when you
> were working on a local account but it was sometimes quite annoying when
> you were using a roaming profile, since windows doesn't react very well
> on those short interrupts.
> It took me quite some time and effort to relate it to dhcp-delays. I
> never bothered to change the default-values of bind and I was quite
> surprised, to find this in the /etc/named.conf file:
> default-lease-time 600;
> max-lease-time 7200;

Hi, shouldn't those lines be in dhcpd.conf ?

Just how have you setup bind9 & DHCP ?


> I've changed the values to:
> default-lease-time 43200;
> max-lease-time 172800;
> 12 hours as default lease-time and 48 hours max. That solved the problem
> for us.
> Nice regards, bbb
> Am 05.09.2014 14:39, schrieb Chan Min Wai:
>> Hello,
>> Can help to explain more about this. 
>> I do have a similar issue which I've not idea what caused it until now. 
>> Thank you. 
>> Regards, 
>> Chan Min Wai 
>>> bugblatterbeast <samba at bugblatterbeast.de> 於 05/09/2014 1:26 PG 寫道:
>>> Hello,
>>>    this message is just FYI. We're using samba4 with bind9 on ubuntu-server-edition with roaming-profiles. We had to deal with unpredictable disconnections, that were most noticeable by the sudden dissapearance of all desktop-icons and often also led to the loss of edited data. The problem turned out, to be caused by dhcp-negotiation-delays due to heavy network traffic. Perhaps this is already common knowledge, but I'd recommend anybody to try increasing bind's default lease-time if facing the same problem. The default value of 10 minutes is quite short. We were able to get rid of the problem by setting it to 12 hours.
>>> Nice regards, bbb
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