So I take it that you are assuming that NetWare is as insecure as Windows. And that it is vulnerable to hacks and exploits. We guess what? Not even close. NetWare is secure.
I guess it would be one thing to sit your server out on the Internet and say 'come get me.' Yeah that would make me nervous. But realistically, all you need to do is allow NTP traffic on port 123 outbound, and allow responses incoming to previous requests. This is stateful filtering and your firewall may or may not do it. And if your completely paranoid, NetWare has the ability to setup packet filtering and you can get very specific as to what traffic you want to allow/disallow to your server. By default, filtering is disabled and not a lot of people know that it's built into the system.(You used to have to have Bordermanager on the server to do this)
Another option.. Does your router do NTP? You could use your router as the NTP time source, and it would handle any requests outbound. Your server wouldn't be any more exposed to the evil internet than it is now.
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