On Mon, Dec 12, 2016 at 11:04 AM, Seth Morabito <[email protected]> wrote: > Hi folks, > > I don't know if this is the best place to ask this question, but I don't > know of any better forums for PDP-10 discussion, so hopefully it's > on-topic enough. > > I recently set up the KLH10 PDP-10 emulator on my network, running > TOPS-20 7.1. It's on a box in my 192.168.1.0/24 network. TCP/IP works > great, I can telnet to it from within my network without any issue. > > I also set up my firewall (a box running CentOS 7.1) to port forward > from external TCP port 2320 to internal TCP port 23 on the KLH10 box. > > Interestingly, when I telnet from _outside_ the network to my firewall's > port 2320, it works, but Telnet goes into line mode rather than > character mode! I can fix it with telnet escape (^]) by setting > character mode explicitly with "mode character", but that's kind of > annoying to do each time I connect. > > It feels like Telnet is no longer doing line mode / character mode > negotiation when I'm port forwarding. It's most mysterious. > > If you want to see for yourself, you can telnet to > gatekeeper.retronet.net 2320, which is the KLH10 instance. > > Does this ring any bells for anyone?
I'm guessing that this is the classic "Many telnet clients default to line mode for only for port 23." issue. Warner
