Starting from the following example (citated on samba wiki):

$host -t SRV _ldap._tcp.samdom.example.com.
_ldap._tcp.samdom.example.com has SRV record 0 100 389 dc1.samdom.example.com.

What do the integers in the response mean?

389 is likely the TCP port involved, but 0? and 100?


Let's have a look at RFC 2782, A DNS RR for specifying the location of services (DNS SRV)

The format of the SRV RR

Here is the format of the SRV RR, whose DNS type code is 33:

_Service._Proto.Name TTL Class SRV Priority Weight Port Target

So although your example does not list TTL, we do know its class is IN and that its type is SRV...

_ldap._tcp.samdom.example.com 0 100 389 dc1.samdom.example.com.

  • Name _ldap._tcp.samdom.example.com
  • Priority 0
  • Weight 100
  • Port 389
  • Target dc1.samdom.example.com.

From AD Windows DC


Priority and weight:


Lower priority (0) is more preferred.

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