1. Do I need to upgrade to bind9 from bind8 ?

if you are worried about security use djbdns

2. The network is secure enough or do I still need to
buy a cable/dsl router ?

Use OpenBSD

3. Do, I need some IDS like snort?

Not if you use OpenBSD

4. I can configure to run pptpd but can't find pptp. 

is it installed? whereis pptp


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