How to Access External PostgreSQL Database from SAP On Linux?

Hi all!
I have Linux-Orale11-ERP6.0. I need connect to an external database PostgreSQL on Linux. I installed the driver ODBC on Linux-Oracle11-ERP6.0 and command isql-v<alias> connect to PostgreSQL:
root@sap etc# isql -v <alias>
Connected!
sql-statement
help tablename
quit
SQL>
How do I now configure the Oracle DB Link?

I installed DG4ODBS.
Configured initH2P.ora, listener.ora and tnsnames.ora.
/oracle/DEV/112_64/hs/admin/initH2P.ora:
# This is a sample agent init file that contains the HS parameters that are
# needed for the Database Gateway for ODBC
# HS init parameters
HS_FDS_CONNECT_INFO = H2P
HS_FDS_TRACE_LEVEL = OFF
#HS_FDS_SHAREABLE_NAME = /usr/pgsql-9.0/lib/psqlodbc.so
# ODBC specific environment variables
#set ODBCINI=/etc/odbc.ini
# Environment variables required for the non-Oracle system
#set <envvar>=<value>
/oracle/DEV/112_64/network/admin/listener.ora
# Filename......: listener.ora
# Created.......: created by SAP AG, R/3 Rel. >= 6.10
# Name..........:
# Date..........:
# @(#) $Id: //bc/701-1_REL/src/ins/SAPINST/impl/tpls/ora/ind/LISTENER.ORA#1 $
ADMIN_RESTRICTIONS_LISTENER = on
LISTENER =
(ADDRESS_LIST =
        (ADDRESS =
          (PROTOCOL = IPC)
          (KEY = DEV.WORLD)
        (ADDRESS=
          (PROTOCOL = IPC)
          (KEY = DEV)
        (ADDRESS =
          (COMMUNITY = SAP.WORLD)
          (PROTOCOL = TCP)
          (HOST = sap-dev)
          (PORT = 1527)
STARTUP_WAIT_TIME_LISTENER = 0
CONNECT_TIMEOUT_LISTENER = 10
TRACE_LEVEL_LISTENER = SUPPORT
SID_LIST_LISTENER =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = DEV)
      (ORACLE_HOME = /oracle/DEV/112_64)
#########I inserted###########
    (SID_DESC =
      (SID_NAME = H2P)
      (ORACLE_HOME = /oracle/DEV/112_64)
      (PROGRAM=dg4odbc)
/oracle/DEV/112_64/network/admin/tnsnames.ora
# Filename......: tnsnames.ora
# Created.......: created by SAP AG, R/3 Rel. >= 6.10
# Name..........:
# Date..........:
# @(#) $Id: //bc/701-1_REL/src/ins/SAPINST/impl/tpls/ora/ind/TNSNAMES.ORA#1 $
DEV.WORLD=
(DESCRIPTION =
    (ADDRESS_LIST =
        (ADDRESS =
          (COMMUNITY = SAP.WORLD)
          (PROTOCOL = TCP)
          (HOST = sap-dev)
          (PORT = 1527)
    (CONNECT_DATA =
       (SID = DEV)
       (GLOBAL_NAME = DEV.WORLD)
#########I inserted###########
H2P.WORLD =
(DESCRIPTION=
     (ADDRESS=
       (PROTOCOL=tcp)
       (HOST=77.120.107.XXX)
       (PORT=5432)
     (CONNECT_DATA=(SID=H2P))
     (HS=OK)
And when I run: tnsping H2P, I get an error:
[root@sap admin]# tnsping H2P
TNS Ping Utility for Linux: Version 11.2.0.2.0 - Production on 29-AUG-2011 15:37:00
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
/usr/sap/DEV/SYS/profile/oracle/sqlnet.ora
TNS-03505: Failed to resolve name
Although:
[root@sap admin]# tnsping DEV
TNS Ping Utility for Linux: Version 11.2.0.2.0 - Production on 29-AUG-2011 16:38:07
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
/usr/sap/DEV/SYS/profile/oracle/sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (COMMUNITY = SAP.WORLD) (PROTOCOL = TCP) (HOST = sap-dev) (PORT = 1527))) (CONNECT_DATA = (SID = DEV) (GLOBAL_NAME = DEV.WORLD)))
OK (10 msec)
what am I doing wrong?

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