[Samba] diconnections when using roaming-profiles with samba4

bugblatterbeast samba at bugblatterbeast.de
Fri Sep 5 13:04:22 MDT 2014

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;

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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