Client is IPv4 and Server is IPv6 getting java.net.ConnectionException

[#1]

I have Hadoop NameNode Service listening on 25000 port with IPv6 IP. Say 2001:db8:3333:4444:5555:6666:7777:8888:25000

But when client sends request to IPv4 IP say 10.20.200.10:25000 getting java.net.ConnectionException

Without changing the server side code, how can we handle this scenario?

[#2]

I have tried IP FORWARDING technique. But still getting java.net.ConnectionException.