On Jan 29, 2023, at 11:14 PM, william@thinktankworkspaces.com wrote:

Do we have any firewall tools? I would like to block some connections.

I know you can tweak routing by messing with /net/ipifc/clone

Just wanted to know if we have any other ways to block conncetions?

Quoth Stanley Lieber <sl@stanleylieber.com>:
check out iwhois (documented in the tel man page).

also: lookman dns.

the existing tools are fairly manual and rudimentary.

sl

there’s no generic firewall, but upas has some filtering options. smtpd(8) reads the file /mail/blocked for blocked addresses, and has the -k flag to block ip addresses manually. the validatesender script (called by upas) checks for a spamhaus file at /mail/lib/spamhaus. there are also ratfs(4) and scanmail(8), which provide more complex filtering mechanisms.