One way replication in PostgreSQL

Hello,

If, for security reasons, I can't create a connection or a flow from subscriber/secundary/slave towards provider/primary/master, witch replication systems can I use ?

If possible, I would prefer partial replication (only some tables) to full base replication (all instances).

Do trigger-based replication systems (like Slony or Londiste or others) need a connection or flow from subscriber to the provider ?

Thanks in advance

----- Météo-France -----
PALAYRET JACQUES
DCSC/MBD
jacques.palayret@meteo.fr
Fixe : +33 561078319