Building DG configurations for Oracle 10g and 11g databases
I noticed that 11g does not do transformation of tns name
provided at stage of DG creation with regard to Oracle 10g
That might be useful if you need to tune some parameters
of SQL*Net - SDU, RECV_BUF_SIZE, SEND_BUF_SIZE
But some problems can be hidden if full string of connection
is not shown but dr....log can shed some light on them.
Have a good day!