[HiPath Manager PC] --> [eth-Cisco-aux] --> [HiPath 3000]
Windows PC: Some Virtual Serial Port (VSP) software, e.g. VSP3 by HWgroup.
Linux PC using Wine:
socat tcp:10.20.30.40:4005 pty,raw,echo=0,link=/home/user/.wine/dosdevices/com1 &
Cisco Router (ipv4:10.20.30.40):
line aux 0
transport input telnet
[Manager PC] --> [Router1] --> [Router2] --> [HiPath 3000]
Router1:
service tcp-keepalives-out
line aux 0
modem InOut
autocommand telnet 10.20.30.40 2005
no activation-character
transport input all
transport output all
escape-character NONE
telnet transparent
autohangup
stopbits 1
flowcontrol hardware
Router2:
service tcp-keepalives-in
line aux 0
no motd-banner
modem InOut
no activation-character
special-character-bits 8
no exec
transport input telnet
transport output telnet
escape-character NONE
telnet transparent
stopbits 1
flowcontrol hardware
Probably a few redundant.
Working, still subject to experiments and improvements.