What about going with a geographic DNS server?
If your unaware of how these work the idea is that the DNS servers provide a different IP address based the IP address of the computer making the DNS query. The idea here is that any of the Danish users would get your time server and anyone making a request outside would get an IP address of your choosing (perhaps a D-link time server)
This may not block 100% of the traffic since there are probably some D-link boxes inside the PIX network.
One example site that uses this technique is Olympics.com. That site is
served by Akamaai (http://www.akamai.com/) but several other companies do
similar things (http://www.netli.com/ is another company). It is easy
enough to make dns queries from different parts of the world to see how
this works in practice.
You have several choices for the DNS server to use. You might be able to
team with one the industry players in exchange of a bit of publicity.
CISCO built in DNS servers also have this ability so you should be able to
do it yourself. It does require a bit of work and magic of cordination of IP/geographic but the big boys already do it and based on the huge amount it has already cost you it might just be the quickest easiest solution.
You mention that changing the IP address of the GPS.dix.dk won't work. This is good news implying that the IP address in not hard coded and hence using the Geographic DNS server will work.
Mike
Slashdot Mirror
What about going with a geographic DNS server? If your unaware of how these work the idea is that the DNS servers provide a different IP address based the IP address of the computer making the DNS query. The idea here is that any of the Danish users would get your time server and anyone making a request outside would get an IP address of your choosing (perhaps a D-link time server) This may not block 100% of the traffic since there are probably some D-link boxes inside the PIX network. One example site that uses this technique is Olympics.com. That site is served by Akamaai (http://www.akamai.com/) but several other companies do similar things (http://www.netli.com/ is another company). It is easy enough to make dns queries from different parts of the world to see how this works in practice. You have several choices for the DNS server to use. You might be able to team with one the industry players in exchange of a bit of publicity. CISCO built in DNS servers also have this ability so you should be able to do it yourself. It does require a bit of work and magic of cordination of IP/geographic but the big boys already do it and based on the huge amount it has already cost you it might just be the quickest easiest solution. You mention that changing the IP address of the GPS.dix.dk won't work. This is good news implying that the IP address in not hard coded and hence using the Geographic DNS server will work. Mike