Thanks rseibert for your kind replay.
the ethernet0/2 of site B is connected to adsl modem having dynmaic public ip address,
so, shall i proceed with what you advise or switch to policy based vpn as below link and do exactly the same.?
will it works or there is something missing to do???
https://kb.juniper.net/InfoCenter/index?page=content&id=KB15076&actp=METADATA
regards,
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