[Anonymoose]

I got it working! Why it worked, I'm not sure.
I checked ec0 with ifconfig and then did
'ifconfig ec0 inet 192.168.0.3 netmask 255.255.255.0 broadcast 192.168.0.255 up'
After that, both computers could ping each other and I can now view the Indy in Finders "Connect to Server" (albeit in read only mode). Filezilla still doesn't work though, hopefully there's a free and easier alternative.

A side effect though, the shutdown option in the sidebar won't work anymore