Firewall Wizards mailing list archives

RE: Internet accessible screened subnet - use public or private IPs?


From: "Behm, Jeffrey L." <BehmJL () bvsg com>
Date: Tue, 26 Jul 2005 08:51:06 -0500

From: Sanford Reed 
2. DNS - This is where most of the problems lay. Due to the time 
(3 to 5 days) needed for DNS changes to propagate you could 
have some connectivity issues unless you can 'mirror' the 
Public services onto both address subnets for a short period. 

Or plan enough ahead (i.e. greater than your current TTL) and lower the
TTL in your affected DNS zones to make the propagation faster (at the
expense of more DNS queries due to the lower TTL).

Jeff
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