Security Basics mailing list archives
re: What addresses to put on my NEW black list?
From: "Steve Barron" <thurgoodj187 () hotmail com>
Date: Thu, 23 Feb 2006 03:12:57 -0600
Why not apply the principle of least privilege to take care of this? Permit only what should be allowed and block everything else.
Ex. permit tcp mailserver any eq 25 Permit other outbound expected traffic Permit tcp any any eq 80 Permit tcp any any eq 443 Deny any anyThis should take care of 95% of instant messaging, streaming media and file sharing. Also, there are different implementations of instant messaging, p2p that run over port 80 to circumvent such firewall policy, but this may be a good start.I would suggest content filtering that allows group and individual URL blocking, and my experience with Websense has been great although there are many vendors that offer other products. Check with your firewall vendor for products that can be integrated.
Good Luck Steve --------------------------------------------------------------------------- EARN A MASTER OF SCIENCE IN INFORMATION ASSURANCE - ONLINEThe Norwich University program offers unparalleled Infosec management education and the case study affords you unmatched consulting experience. Tailor your education to your own professional goals with degree customizations including Emergency Management, Business Continuity Planning, Computer Emergency Response Teams, and Digital Investigations.
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Current thread:
- What addresses to put on my NEW black list? phunked up! (Feb 22)
- Re: What addresses to put on my NEW black list? Ryan Cummings (Feb 22)
- RE: What addresses to put on my NEW black list? David Gillett (Feb 23)
- Re: What addresses to put on my NEW black list? Brian Loe (Feb 23)
- Re: What addresses to put on my NEW black list? nodialtone (Feb 23)
- Re: What addresses to put on my NEW black list? Neil (Feb 23)
- <Possible follow-ups>
- re: What addresses to put on my NEW black list? Steve Barron (Feb 23)
- re: What addresses to put on my NEW black list? Jim Halfpenny (Feb 24)
- Re: What addresses to put on my NEW black list? Ryan Cummings (Feb 22)