[Samba] ms-rpc dynamic port range

Denis Cardon dcardon at tranquil.it
Thu Oct 27 18:39:48 UTC 2016

Hi everyone,

According to the samba wiki page [1], samba ms-rpc dynamic port range is 
1024-5000, which looks mostly coherent with a quick tcpdump analysis. 
However it seems like there are also some connection in the upper range 
or MS-RPC 49152-65535.

It seems that the lower range would be for AD2003 according to kb832017, 
and that the upper range would be for AD2008 and up [2].

So my question is, what is the range that is used? Actually, I grep'ing 
in the source code was quite unlucky because I didn't even found where 
it was defined in samba source code... And I guess there aren't any 
smb.conf parameter to control those values?

I was digging into this question after negotiating port openings for 
dynamic range with the network/security team at a client.

Another similar question I have is about the drs replication port, and 
if it can be set to a fixed value in order to limit the replication 
partners through firewalling, like in MS KB224196 [3]?



[1] https://wiki.samba.org/index.php/Samba_AD_DC_Port_Usage
[2] https://support.microsoft.com/en-us/kb/832017
[3] https://support.microsoft.com/en-us/kb/224196

Denis Cardon
Tranquil IT Systems
Les Espaces Jules Verne, bâtiment A
12 avenue Jules Verne
44230 Saint SĂ©bastien sur Loire
tel : +33 (0)

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