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I have two separated networks and there is one computer that is in both of them.

I want to forward connections made to that computer on one port from one of the networks to a port on a specific computer in the other network.

I am able to do this in ipv4 by doing

sysctl -w  net.ipv4.ip_forward=1

and adding the following rule to iptables

iptables -t nat -A PREROUTING  -p tcp --dport 49000 -j DNAT --to-destination 192.168.2.1:49000

I have tried doing the same in ipv6 with

sysctl -w  net.ipv6.conf.all.forwarding=1

and

ip6tables -t nat -A PREROUTING  -p tcp --dport 49000 -j DNAT --to-destination [fc00::3]:49000

but it is not working.

Does anyone know why this doesn't work and what should I be doing instead?

UPDATE: The steps I explained here actually work. The problem was the way I was testing the ipv6 connectivity, my test was using a connection that only had an ipv4 address so it wasn't working. After assigning it an ipv6 address I realized the port forwarding was actually working.

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    1) Look at the ip6tables rule counters (leftmost columns in the -L -v list); is the rule being hit at all? 2) Investigate using tcpdump or Wireshark, whether it really doesn't work at all or whether it does something else?
    – grawity
    Commented Nov 20 at 5:26
  • Thank you for answering, in the end it was my fault, my test for checking ipv6 connectivity was wrong and in the end ipv6 forwarding was always working.
    – oscar
    Commented Nov 20 at 12:58

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