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C.Dummy schrieb:

>  I'm not sure how to use packages libpcap and tcpdump on BeringU box. I 
> checked shorewall logs it doesn't block connection from my outside ip.

tcpdump depends on libpcap. Install both packages

apkg -i libpcap
apkg -i tcpdump

Read the documentation of tcpdump on a different system or from WWW
Start tcpdump with appropriate options and filter expression, e.g.

tcpdump -X -i ppp0 port ftp


try to connect from external address to your FTP server


I just found out that the OS does the initial connection handshake when you 
connect to a port where the server has called listen() even if the server has 
not (yet) called accept().
In this case the client will wait for the welcome message until the server 
accepts the connection and writes this message.


Bodo

P.S. Please do not send me a copy of a message you send to the mailing list.
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