[ENet-discuss] NAT hole punching with Enet - query on an approach

[Madhan Kanagavel]

That is how we do it in Tonido (www.tonido.com) for NAT traversal.

We have our own layer that does NAT punch so that ENet can establish connection. It uses the same UDP socket.
We simply look at each packet(first couple of bytes) before handing it over to ENet. It works pretty well.

By the way, much thanks to ENet. Its a great library, considering how much we have abused it. :-)
It has withstood everything amazingly well.

-Madhan




----- Original Message ----
From: Daniel Aquino <mr.danielaquino at gmail.com>
To: Discussion of the ENet library <enet-discuss at cubik.org>
Sent: Monday, April 27, 2009 4:41:25 PM
Subject: Re: [ENet-discuss] NAT hole punching with Enet - query on an approach

Are you saying that I could send/recieve my own type of data on the
udp port even while enet is using it ?

On Mon, Apr 27, 2009 at 11:38 PM, Lee Salzman <lsalzman1 at cox.net> wrote:
> Almost anything that doesn't look ike a valid ENet packet will be ignored.
>
> Lee
>
> M. Rijks wrote:
>>
>> Thank you for your reaction Shawn.
>>
>> Yes, I considered sending around UDP packets before getting ENet in the
>> equation. However, I have a timing issue there. After the game server has
>> punched through towards the client IP+port, I need to find an appropriate
>> time for the client to initiate the ENet connection on the other end. But I
>> don't exactly know if, or when, the server's punch packet arrives at the
>> client. I can't wait for its arrival since the client's firewall may block
>> it entirely. So there is the risk that when I finally tell the client to
>> initiate its connection to the server, it first receives the UDP packet that
>> was used to merely punch the server-end hole. It will most likely contain
>> data that will make no sense to the client, throwing off ENet's connection
>> protocol.
>>
>> Maybe I should change my question into "what kind of UDP packet content
>> will ENet happily ignore when waiting for the connection to establish?" :)
>>
>> Cheers,
>>
>> Martin
>>
>
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