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I’ve been running into DNS problems when using the CheckPoint VPN connection from work and finally figured out the issue. I setup my home network to use OpenDNS and since it returns a default entry for any unknown lookups it kept sending my intranet lookups to them.
The workaround is to configure OpenDNS to NOT try and “fix” lookups for certain domains. The process is outlined here: http://www.opendns.com/support/article/164
And if you’re not using OpenDNS, it’s worth checking out. DNS lookups are much faster than your upstream ISPs servers. And if you’ve got kids, you can set it up to block DNS for questionable sites.