Hi Pratik, I'm assuming that it is the session timeout that's causing the disconnection. The log on the OpenSSH server should confirm that.
I think the only real solution would be to improve the speed of libtommath on that device. Running a profiler to determine the slowest parts would be the first step. I don't know much about the device itself though it seems libtommath performs quite badly - OpenSSL is generally faster. Looking at the difference in its maths operations might help. It's non-trivial work though. Cheers, Matt On Wed, Sep 24, 2014 at 02:12:41PM +0530, pratik singh wrote: > Hi, > > I am using Dropbear 0.48 with uClinux-dist. Currently dropbear server is > working fine but while trying to run dbclient it throws write error. Some > of the traces are: > > TRACE: leave process_packet > TRACE: enter cli_sessionloop > TRACE: enter send_msg_service_request: servicename='ssh-userauth' > TRACE: enter encrypt_packet() > TRACE: encrypt_packet type is 5 > > TRACE: enter writemac > TRACE: leave writemac > TRACE: enter enqueue > TRACE: leave enqueue > TRACE: leave encrypt_packet() > TRACE: leave send_msg_service_request > TRACE: leave cli_sessionloop: sent userauth service req > TRACE: enter write_packet > > TRACE: enter cli_tty_cleanup > TRACE: leave cli_tty_cleanup: not in raw mode > TRACE: enter session_cleanup > TRACE: enter chancleanup > TRACE: leave chancleanup > TRACE: leave session_cleanup > dbclient: connection to pratik@10.10.10.1:22 exited: error writing > -------------------------------------------------------------------------------------------------------------- > > I have tried the following: > 1) Run dbclient with -K option but still getting the same write error > 2) Run dbclient with -y option but still getting the same write error > > On further debugging I have found that this write comes because server (in > this case Openssh) is getting timeout. > > I am running microblaze processor at about 60mhz with hardware > multiplier, divider enabled. > > > From the wireshark capture i have seen that server is sending "FIN" > packet. also server is sending the 2 ssh packets in one reply packet. > Do not know the reason of this behavior. > > > I am facing this problem for connection between dbclient <----> Openssh. > > > Please help as m stuck to this problem since very long. Appreciate your reply. > > > Attached the pcap file for your reference. apply "ip.addr==10.216.114.137" > filter in pcap file. IP address is client having dbclient and other is > server having openssh. > > > -- > Thanks & Regards > Pratik Singh
