[Samba] Samba AD - Join MAC

[lingpanda101]

On 4/19/2018 9:28 AM, Micha Ballmann via samba wrote:
> Hello Community,
>
> im joining several macintosh workstations to my samba AD. First of 
> all, it works pretty well and im able to authenticate/login my AD user 
> on a mac.
>
> Server: Ubuntu 16.04
>
> SAMBA: 4.7.7
>
> First:
>
> Everytime when a mac starts up, some log entries are shown in 
> log.samba. Looks like (Its not a flood, about 4 messages for each 
> client):
>
> [2018/04/19 14:35:04.645001,  0] 
> ../source4/dns_server/dns_update.c:407(handle_one_update)
>   Can't handle updates of type 255 yet
> [2018/04/19 14:52:43.556390,  0] 
> ../source4/dns_server/dns_update.c:407(handle_one_update)
>   Can't handle updates of type 255 yet
> [2018/04/19 14:52:43.915746,  0] 
> ../source4/dns_server/dns_update.c:407(handle_one_update)
>   Can't handle updates of type 255 yet
> [2018/04/19 15:02:25.312616,  0] 
> ../source4/dns_server/dns_update.c:407(handle_one_update)
>   Can't handle updates of type 255 yet
> [2018/04/19 15:02:25.692692,  0] 
> ../source4/dns_server/dns_update.c:407(handle_one_update)
>   Can't handle updates of type 255 yet
>
> Second:
>
> Everytime when a mac starts up, during the login process, one samba 
> process/CPU core is running on 100%. After successful login there is 
> no more CPU peak to see. The login time is about 30-60 second.
>
> I hope you can help me to understand these messages or behavior.
>
> Withe best regards
>
> Micha
>
>
I'm assuming you are using the internal DNS and not bind? If so it looks 
as if Samba doesn't support the request type.

source4/dns_server/dns_update.c

    switch (update->rr_type) {
         case DNS_QTYPE_A:
         case DNS_QTYPE_NS:
         case DNS_QTYPE_CNAME:
         case DNS_QTYPE_SOA:
         case DNS_QTYPE_PTR:
         case DNS_QTYPE_MX:
         case DNS_QTYPE_AAAA:
         case DNS_QTYPE_SRV:
         case DNS_QTYPE_TXT:
                 break;
         default:
                 DEBUG(0, ("Can't handle updates of type %u yet\n",
                           update->rr_type));
                 return DNS_ERR(NOT_IMPLEMENTED);
         }

Google searching DNS type 255 (RFC 1035) states it's "A request for all 
records". You could run a trace and see what application is requesting 
this record type.

As far as the cpu usage. I do not know.

-- 
--
James