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   CHRS: CP850 2   
   TZUTC: 0200   
   Hallo Tommi!   
      
   21.08.2019 20:01, Tommi Koivula schrieb an Torsten Bamberg:   
      
    >> Currently my vmodem and telnet ports are down, but usually I have 8   
    >> telnet ports running, with one instance of vmodem(2k).   
    TK> 8 different TCP ports?   
   I meant telnet-sessions simultanously. Of course only port 23 is attached.   
      
    TK> My Vmodem of SIO 1.60 has 16 "ports", but listening only one TCP port.   
   I'm using sio2k. sio2k supports 256 'sessions', witch can be telnet, com-ports   
   or com emulated capi-devices. I've got one big problem with sio2k, I can't   
   register it any more.   
      
    TK> Which is 23 BTW. And that port is not exposed to the internet, my   
    TK> router forwards external port 32 to port 23 at OS/2 computer.   
   Ahm, i've got a special security configuration, not only because of the   
   'unclosed session bug' from sio2k   
      
      
     cable -->-- cable-router -->-- Router 1         Firewall 1   
       dsl -->--  dsl-modem   -->-- BSD-Router -->-- BSDFirewall   
                                                      |   |   |--->--- DMZ   
                                                      |   |   
                                                      |   |--->--- LAN   
                                                      |   
                                                  -> Firewall 2   
                                                  |  with fail2ban BSD   
                                                      |   
                                RexxLogScripting  ^   |   
                                                  |  Telnet on   
                                                  -- Mailbox 01   
      
   Security by obscurity. ;-)   
      
    >> But there is one big bug with vmodem; if the clientsession isn't   
    >> closed properly, vmodem hangs up the whole computer without a trap.   
    TK> Oh?   
   Jap. If more than 256 connections are opend, and not properly closed, sio2k   
   does hang up the system.   
      
    TK> 'Tommi   
   Bye/2 Torsten   
      
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