Tomas,
I included many of the outputs you mention. Since we're talking about
a networking configuration, obviously doing something like ssh to copy
the relevant information is not yet possible, so I looked at the
screen of the OpenBSD system, and typed (in abbreviated form) the most
relevant parts like ifconfig, resolv.conf and so on into this message
(see my first post). I didn't copy the actual IP addresses, but unless
I typed it in wrong on OpenBSD (possible, but unlikely given how many
times I entered it), the addresses in question work on another system
(the one this message is sent from). Nevertheless, I will run the
commands you mention on OpenBSD and copy it by some other means, like
a USB flash drive.