Shidong:
Heya. Apologies for dragging you a bit off-topic: the name
"EchoServer" is one that I use for our TCP relay product that
facilitates "firewall friendly" EchoVNC connections. It doesn't
actually use holepunching, just completely uninteresting packet
relaying. From your email, I think someone might be reusing our
product name; if you can point me to the project owner, I'd like
to clear up the potential confusion.
cheers,
Scott
On Nov 5, 2008, at 2:06 PM, shidong chen wrote:
> Hello everyone,
>
> I'm doing tcp holepunching experiments based on Bryan Ford's paper
> and test code. So far I've not succeded at all. I verifed the tested
> PC/NAT translate the private port into same public port. I suppose
> I'm making some mistake in my test code. This topic may sound too
> basic for you guys but I'd appreciate any help.
>
> here is what I'm doing
> I developped my test code from a simple TCP echo client and echo
> server program. Let client and server share and bound to same port.
> On local linux PC behind a NAT/firewall, I run both EchoClient and
> EchoServer. On remote Linux PC( a server on internet, not behind
> NAT), I run EchoClient only. I expect remote EchoClient can build a
> connection into my local EchoServer through "holepunching". But it
> never succedes.
>
> Here is screen print:
>
> [local_host]$ ./EchoClient remote_host 6881
> argc=3, Echo Server = remote_host:6881
> setreuse() #63: Local TCP port: 6881
> Sleeping finished.
> Connect failed: Connection refused
> Connect failed: Connection refused
>
> [local_host]$ ./EchoServer 6881
>
> [[remote_host]$ ./EchoClient local_host 6881
> argc=3, Echo Server = local_host:6881
> setreuse() #64: Bound to local TCP port: 6881
> Connect failed: Operation now in progress
> Connect failed: Operation already in progress
> Connect failed: Operation already in progress
> Connect failed: Operation already in progress
>
> Thanks a lot
> Shidong
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