nanog mailing list archives
Re: Network Segmentation Approaches
From: Andrew Jones <aj () jonesy com au>
Date: Thu, 07 May 2015 09:08:38 +1000
It depends on the software used and implementation.Many rulesets for pf on BSD start with 'block in on interfaceX' for instance, because it uses a "last match wins" system, unless you use the 'quick' keyword to make rule processing stop if that rule matches.
Andrew On 07.05.2015 08:30, Scott Weeks wrote:
--- rsk () gsp org wrote: From: Rich Kulawiec <rsk () gsp org> The first rule in every firewall is of course "deny all" and subsequent rulesets permit only the traffic that is necessary. ------------------------------------ I think you got this backward? That way all traffic is blocked, so none is allowed through. Also, deny by default at the end of the rule set is not the best thing for every network that needs a firewall. Some just want to block bad stuff they see and allow everything else. (And some have stated here that they will block entire countries until their culture changes!) scott
Current thread:
- Re: Network Segmentation Approaches, (continued)
- Re: Network Segmentation Approaches Mark Andrews (May 05)
- Re: Network Segmentation Approaches Gene LeDuc (May 05)
- Re: Network Segmentation Approaches Mark Andrews (May 05)
- Re: Network Segmentation Approaches Jimmy Hess (May 05)
- Re: Network Segmentation Approaches Stephen Satchell (May 05)
- Re: Network Segmentation Approaches charles (May 06)
- Re: Network Segmentation Approaches Christopher Morrow (May 06)
- Re: Network Segmentation Approaches charles (May 06)
- RE: Network Segmentation Approaches Keith Medcalf (May 05)
- Re: Network Segmentation Approaches Joel Maslak (May 05)
- Re: Network Segmentation Approaches Scott Weeks (May 06)
- Re: Network Segmentation Approaches Rich Kulawiec (May 06)
- Re: Network Segmentation Approaches Andrew Jones (May 06)
- Re: Network Segmentation Approaches Scott Weeks (May 06)
- Re: Network Segmentation Approaches Rich Kulawiec (May 07)
- [no subject] Jimmy Hess via NANOG (May 07)
- Re: Network Segmentation Approaches Rich Kulawiec (May 07)
- Re: Network Segmentation Approaches Scott Weeks (May 06)