[Samba] DDNS-filover in wiki

[L.P.H. van Belle]

Hai Rowland. 

Something to add also for the wiki. 

Also a notice, if your using SELinux or AppArmor, make sure these ports are know by these programs. 
And dont forget firewalls to open these ports. 

Also a thing if  your running your own dns, open port 53 TCP and UDP.
If a UDP port 53 response is larger than 512 bytes then it may be truncated or then DNS falls back to using TCP

And setting an increase size for udp help edns requests. 
edns-udp-size 4096 ;


Greetz, 

Louis



> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Stefan Kania via
> samba
> Verzonden: maandag 27 februari 2017 11:07
> Aan: samba at lists.samba.org
> Onderwerp: [Samba] DDNS-filover in wiki
> 
> Hi Rowland,
> 
> you added the failover to your wiki:
> 
> 
> https://wiki.samba.org/index.php/Configure_DHCP_to_update_DNS_records_with
> _BIND9
> 
> It would be a good idea to explain some things. In your script you are
> using the port 519 and 520 for the failover:
> --------------
> failover peer "dhcp-failover" {
>   primary;
>   address dc1.samdom.example.com;
>   port 519;
>   peer address dc2.samdom.example.com;
>   peer port 520;
>   max-response-delay 60;
>   max-unacked-updates 10;
>   mclt 3600;
>   split 128;
>   load balance max seconds 3;
> }
> --------------
> Why are you using this ports?
> Are this ports TCP or UDP?
> Will they be opened automatically?
> 
> A short explanation would be good. As I told you before, it's one of the
> best howtos in the wiki.
> 
> 
> Stefan
> 
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