Hello,


    I am moving a number of web sites from one colo to another,
re-numbering them in the process, and I have run into an interesting
issue I'd like to solicit feedback on.

    My dns TTL's are all 300 seconds, and I have noticed that once I
update the A records with the new addresses, most (but not all) web
clients begin using the new address within 5 minutes or so. However,
there is a persistent set of stragglers who continue accessing the
site(s) on their old addresses for far in excess of this - up to a week
in fact. And, what I have noted, all of these clients have something in
common - they all appear to be satellite users of viasat/exede.  This is
based on whois lookups of the ip addresses of the clients. Note, I am
NOT expecting 'turn on a time' - just looking for clients to refresh
within a reasonable time.

       I am wondering if perhaps this is due to some kind of (known?)
bug in the embedded dns cache/client in the client satellite modem, or
if there is another plausible explanation I am not seeing. It compounds
my problem slightly since I have to continue running the web sites at
both the old and new addresses while these things time out I guess and
it's just inconvenient.


Thanks.


MIke-