On 24/11/2024 23:11, peter@easthope.ca wrote:
An embedded system may have one terminal connected. A connection to an external network is not necessary for communication between utelnetd and telnet client. If the connected system is also connected to an external network, a firewall can prevent illicit access.
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My original question is restated here. https://lists.debian.org/debian-gcc/2024/11/msg00059.html
I would still consider dropbear - a SSH server implementation suitable for embedded systems. It is used e.g. by OpenWRT or to unlock encrypted disks from initrd.
Perhaps you do not need network at all. I am not sure, but perhaps an application might just create a pty, a VM might expose a virtual serial port.