Discovery of external IPv4

[yangwao]

Hello. So I increased my level of IPFS knowledge a lot in last days. But I still have problem about external ip discovery. I know it's working like asking peers where I dial from. But this IPFS daemon is running for few hours & days and I still dont get external address, however, when I ran at same LAN segment on my mac, I get external IP. In resulting this, I'm having problem to pin anything from my server when I'm not home with mac :/

Any idea what could be wrong? Board is ARM Odroid X2.
Will to colaborate, yangwao @ freenode
Thanks!

root@markone:~# uname -a
Linux markone 3.8.13.30 libp2p/go-libp2p-nat#1 SMP PREEMPT Sat Sep 5 00:07:47 BRT 2015 armv7l armv7l armv7l GNU/Linux
root@markone:~# curl -s http://192.168.13.215:8080/version
Commit: d48cd56
root@markone:~# ipfs id
{
    "ID": "QmbzAwAqLzpEkCT98n8vYZkDGbbZZEkZzumYLyyRVJJfiz",
    "PublicKey": "CAASpgIwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC77y7FK2NHq9Ty+bOCFVhcKq6rmwQWc3pQLdeMfERzsuoEYLbZOt03nEmD0/YuvzGVdV1XVtDapdnIyXenVTrDKc8Dnig4kN6aQV4bFODx27vtB7Qw+zvHGZXDW87DAhkk3aS208D+UpvCkXBoG0sDSW5S5vMNpBXoscsEhiAGbBopxxw3Ua+/mTQjYrLq0eGUAvzvKQ1HVe2sq2arUNjvS01cIL8npzgYcBYjcIQoQgGsR1Pc4IOFehOM64bDooG2k0jTZFS63HhJxLuEXQ7soolNR+4yJcDAXHj1Wp/Lpc47EE8BsolUwcON2Od9RKQlEUBhtLHp1ibMVukzaVKTAgMBAAE=",
    "Addresses": [
        "/ip4/127.0.0.1/tcp/4001/ipfs/QmbzAwAqLzpEkCT98n8vYZkDGbbZZEkZzumYLyyRVJJfiz",
        "/ip4/192.168.13.215/tcp/4001/ipfs/QmbzAwAqLzpEkCT98n8vYZkDGbbZZEkZzumYLyyRVJJfiz",
        "/ip6/::1/tcp/4001/ipfs/QmbzAwAqLzpEkCT98n8vYZkDGbbZZEkZzumYLyyRVJJfiz"
    ],
    "AgentVersion": "go-libp2p/0.1.0",
    "ProtocolVersion": "ipfs/0.1.0"
}

[mnp]

Have a look at issue #57, where they're talking NAT traversal. I'd be interested to hear what the final transport resolution was, if it got lost in the issue threads.

[yangwao]

Also I plan to upgrade my Odroid X2 to latest archlinux soon, may that helps somehow.
Kernel 3.8. could be really old and something doesnt play there good.
@mnp thanks for reference! This tunneling is always hassle.

[Kubuxu]

For me the problem is that NAT traversal and IP discovery runs only during startup. This means if I switch interface I am using and my external IP changes, the ipfs silently stops resolving most hashes.

[mnp]

@Kubuxu, sounds like an issue? Is there one open for that?

[whyrusleeping]

Yeah, this definitely needs to be better. If anyone can make a good reproducible test script for this, that would help out tremendously.

I'm bumping this issues priority up a bit on my todo list

[mnp]

Such a script should be pretty easy with a docker container. Docker engine around v1.10 supports attaching and detaching from multiple networks. You can make a new network, attach your container running a test article to it, and then detach from the old network. The interfaces will get changed out from under the test article. Approx like this:

$ docker network ls
NETWORK ID          NAME                DRIVER
284f80380e11        bridge              bridge
b2ab7b2a390b        none                null
e08234170b3f        host                host

$ docker network create extranet
56b1a95f5afa81db00e6d3c0f02f2471270dcd76d0f97d282be2e0b2571db613

$ docker network ls
NETWORK ID          NAME                DRIVER
56b1a95f5afa        extranet            bridge
284f80380e11        bridge              bridge
b2ab7b2a390b        none                null
e08234170b3f        host                host

$ docker run -itd --name=cont1 busybox
894696e9f9a93a1182ab52e8f646d24a4f761a17ab016727cc6424bff1508f58

$ docker exec -it cont1 ifconfig | grep 'inet addr'
          inet addr:172.17.0.3  Bcast:0.0.0.0  Mask:255.255.0.0
          inet addr:127.0.0.1  Mask:255.0.0.0

$ docker network connect extranet cont1

$ docker exec -it cont1 ifconfig | grep 'inet addr'
          inet addr:172.17.0.3  Bcast:0.0.0.0  Mask:255.255.0.0
          inet addr:172.18.0.2  Bcast:0.0.0.0  Mask:255.255.0.0
          inet addr:127.0.0.1  Mask:255.0.0.0

$ docker network disconnect bridge cont1

$ docker exec -it cont1 ifconfig | grep 'inet addr'
          inet addr:172.18.0.2  Bcast:0.0.0.0  Mask:255.255.0.0
          inet addr:127.0.0.1  Mask:255.0.0.0

I'll post here if I implement it.

[CMCDragonkai]

Would this be related to multihoming and mobile IP?

• https://en.wikipedia.org/wiki/Multihoming
• https://en.wikipedia.org/wiki/Mobile_IP

[Stebalien]

Closing in favor of libp2p/go-libp2p#1541.