ACL question - Is this sensible?

[Duncan Brannen]

I want to ensure any connections to our ldap server from outside our 
domain are encrypted.

I've tried this by adding the following to my acls (All other access is 
the same)

access to *
       by peername.ip=138.251.0.0%255.255.0.0 none break
       by ssf=128 none break
       by * none


Is this a sensible solution?  It seems like a bit of a hack to me.


Cheers,
         Duncan