Connect 2 peers behind the NAT

[personstays]

Hello,

Thanks for this good project. I have been trying to use this project to test the peer to peer discovery. I have the following setup. (2 nodes over NAT and one Non-NATed bootstrap node)

• A public ip (vps on DigitalOcean) as a Bootstrap Node with the following code:

import logging
import asyncio

from kademlia.network import Server

handler = logging.StreamHandler()
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
log = logging.getLogger('kademlia')
log.addHandler(handler)
log.setLevel(logging.DEBUG)

server = Server()
server.listen(8468)

loop = asyncio.get_event_loop()
loop.set_debug(True)

try:
    loop.run_forever()
except KeyboardInterrupt:
    pass
finally:
    server.stop()
    loop.close()

• Computer A behind NAT (at office) which bootstrap from public ip at DigitalOcean with the following code:

import logging
import asyncio

from kademlia.network import Server

handler = logging.StreamHandler()
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
log = logging.getLogger('kademlia')
log.addHandler(handler)
log.setLevel(logging.DEBUG)

server = Server()
server.listen(8468)

loop = asyncio.get_event_loop()
loop.set_debug(True)
loop.run_until_complete(server.bootstrap([("<public ip from DigitalOcean>", 8468)]))

try:
    loop.run_forever()
except KeyboardInterrupt:
    pass
finally:
    server.stop()
    loop.close()

• Computer B behind NAT (at home) with the same source code as Computer A.

Those 2 nodes could connect the bootstrap node. My problem is that I can't make those 2 nodes to connect to each other through bootstrap node.

In Computer B - The response was kademlia.protocol - WARNING - no response from <Computer A's NAT's external IP>:46357, removing from router

In Computer A - Vice versa

Since I'm new to "P2P Network" (Kademlia), perhaps I missed or did something wrong. I've tried to search for the answers on the internet for many days, but no luck. There aren't many documents about this problem either.

Could you help guide me how to connect those 2 nodes over NAT? Or source code would be highly appreciated.

Thanks!

[bmuller]

If both machines are behind a NAT, then UDP hole punching won't work and the two machines won't be able to talk to each other. Eventually, we could come up with a way of coordinating mutual hole punching using a coordination node, but that would require a lot of work.