Re: [dtn-users] A problem with dtntunnel

["[e-mail]" <[e-mail]>]

Hi David,

Thanks for your help, nc -w1 did the trick. But shouldn't dtntunnel
behavior be changed? The receiving dtntunnel could signal the sending
dtntunnel, that the listening nc has disconnected, so that the sending
dtntunnel close its connection to the sending nc. Or is this solely the
problem of nc?

2012/12/5 Zoller, David A. (MSFC-EO60)[HOSC SERVICES CONTRACT] <
[e-mail]>

> Hi Sergey,****
>
> On RHEL 5.7, I am running dtn-2.9.0 plus modifications that should not
> impact the behavior of dtntunnel.****
>
> I just ran your test without the iptables redirect and I see the same
> behavior.****
>
> I believe that the sender exits if you go directly from nc to nc because
> the receiver exits when it gets an end of file.****
>
> You can add a “-w 1” option to the sender nc so that it will timeout and
> exit after stdin is idle for 1 second.****
>
> Best regards,****
>
> DZ****
>
> ** **
>
> David Zoller****
>
> COLSA Corporation****
>
> HOSC / C107  ****
>
> (Office: [phone]
> *EMail: [e-mail]****
>
> ** **
>
> *From:* [e-mail] [mailto:[e-mail]] *On
> Behalf Of *[e-mail]
> *Sent:* Tuesday, December 04, 2012 11:13 AM
> *To:* [e-mail]
> *Subject:* [dtn-users] A problem with dtntunnel****
>
> ** **
>
> Hello all!
>
> I am using dtn-2.9.0 on a RHEL 6 based Linux distro and I am having a
> problem when using netcat (nc) with dtntunnel.
> On the sender node I run "cat /etc/passwd | nc receiver_ip". On the
> receiver node I run "nc -l 9999". With the help
> of Iptables port 9999 gets redirected to the port 19999, which is listened
> by dtntunnel.
>
> The file /etc/passwd is successfully delivered to the receiver and is
> shown on the screen. After this the receiving nc exists.
> No problem here. However, nc on the sender node doesn't exit after it
> sends the file. It continues to run forever. When I
> run nc in the opposite direction, I get the same problem - the sending nc
> doesn't exit.
>
> My configuration on both nodes is symmetric:
> iptables -t nat -A OUTPUT -d $REMOTE_HOST -p tcp --dport 9999 -j DNAT --to
> $LOCAL_HOST:19999
> dtntunnel -T $LOCAL_HOST:19999:$REMOTE_HOST:9999 $REMOTE_NODE/dtntunnel/nc
> -d
> dtntunnel -L --local-eid $LOCAL_NODE/dtntunnel/nc -d
>
> dtnping works ok in both directions.
>
> Please give me any advice.
>
> With best regards,
> Sergey Sireskin ****
>



-- 
Kindest Regards

Sergey Sireskin
FGUP CNII EISU