Another Port problem

cheesus · 11-14-2011, 08:18 AM

So you are dD5E0C0E6.acc ?
Well, then it seems dD5E0C0E6.acc is the last hop, so the forward from your router to your linux box does not work...

cskiwi · 11-14-2011, 08:27 AM

I think so that I am dD5E0C0E6.acc,
how could I check?

and what can I do to forward it to the server besides port-forwarding?

cheesus · 11-14-2011, 08:41 AM

do you have something listening on the port forwarding target ?
maybe choose (and open/forward) a new (previously unused) port and listen there using netcat -l -p portno
(netcat is somtimes called "nc". install it if you don't have it by default.)

then telnet from the OUTSIDE to YOUR_ROUTER_IP OPENPORT and type 123<enter>
and "123" should appear in the shell where you ran netcat.

also, port forwarding might require that you activate "NAT" and/or "masquerading" option in your router (don't know which kind you have...)

if nothin else helps, you might need to sniff where the packets are dropped using ethereal...
...BTW... check the logfile of your router. set it to debug ...

cskiwi · 11-14-2011, 08:50 AM

Wow thanks a lot already. This weekend i'm gonna check this stuff out,
because i can only access the server in weekends

cskiwi · 11-18-2011, 12:16 PM

ok, I have acces again over the server, but I have no clue what i need to do.

netcat -l -p 80, doesn't work

and the telnet should i execute something like:
telnet OUTSIDE 192.168.0.194 OPENPORT 123
or what?
not realy following you there :S

cheesus · 11-18-2011, 01:00 PM

Quote:

Originally Posted by cskiwi

netcat -l -p 80, doesn't work

So what's it say...?
Maybe 80 is occupied ? Tried 8081 ?

Quote:

Originally Posted by cskiwi

and the telnet should i execute something like:
telnet OUTSIDE 192.168.0.194 OPENPORT 123
or what?
not realy following you there :S

You go to some machine outside your network, i.e. on the other side of your router, e.g. a friends machine, or an internet cafe, or a remote machine you have access to. Then you type
telnet MYIP MYPORT
where MYIP is the IP that you think you have from the outside. (where your friends are trying to connect to)
and MYPORT is what you gave at -p

cskiwi · 11-18-2011, 01:35 PM

Ow that's what you're saying xD

This is what i get:

Code:

root@KiwiServer:~# netcat -l -p 80
This is nc from the netcat-openbsd package. An alternative nc is available
in the netcat-traditional package.
usage: nc [-46DdhklnrStUuvzC] [-i interval] [-P proxy_username] [-p source_port]
          [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_protocol]
          [-x proxy_address[:port]] [hostname] [port[s]]

cheesus · 11-19-2011, 04:13 AM

nc -l -p 80

cskiwi · 11-19-2011, 06:54 AM

Gives same results

cheesus · 11-19-2011, 07:10 AM

Well, that works for my netcat, so you need to study the doc for yours.

Anyway, that was just meant at a "quick test" for the connection, if that turs out too complicated, I don't know...

For all that has been done so far, I'm not 100% convinced that you're completely clear about the network route, your external IP vs your internal IP, and settings in your router (hardware box?).

But I have no more ideas how to help you with that.

Rule of thumb:
If "telnet YOUREXTERNALIP SOMEPORT" from OUTSIDE your network does give "connection refused", it means that the route, port and firewall are ok, and you don't have a service listening on the port. If it just times out, there is a firewall in the way somehwere.

Good Luck!