A potential solution to problems viewing websites on Safari, firefox etc.

I wanted to share with you this most curious incident, which for once has a happy ending - for whatever help it may provide others with similar problems to me.. so here goes:
Since about mid-June I (on my iMac G5) and my partner on his MacBook have both had a real nightmare trying to access certain websites that have one thing in common, they have or are to some extent powered by a database.
My problems were with Typepad and with Ebay (having trouble viewing some items and posting stuff to be sold) as well as some other sites being super slow to load or in some cases not loading at all. (like sites found on Google searches for instance) So what to do? Both of us have been tearing our hair out with this problem as we were not sure whether it was our service provider's fault, the router, the Airport, Safari (but then we had similar problems with Firefox) or the OS10.5.4 upgrade both of us duly installed when it came through on program update..
So after testing the router, the connection, airport and coming to the conclusion that somehow the problem was relating to how the Macs were connecting to the Internet.. or specifically weren't connecting to certain sites..Then I struck gold by figuring out this little workaround:
1. Open up Network preferences: Apple Menu > System Preferences > Network
2. If you are connecting to the Internet via Airport, click on Airport in the left column and click on the Advanced button, if you are using Ethernet choose that and click on Advanced
3. If you like me connect to the Internet Using DHCP, you will most likely find that below is a bit that says Configure IPv6 and the default is Automatically. Set this to off. OK it, you are back to Network panel, choose Apply.
4. Quit Safari and restart it again and the sites should load. Alternatively you can go into Network, click on Advanced, then the DNS panel and enter the following DNS servers:
208.67.222.222 and 208.67.220.220 OK it, Apply and quit and restart Safari again
5. and here's the bizarre thing: after the sites load you can go into Network, Advanced and turn on Configure IPv6 Automatically again, as well as delete the DNS servers you added in the DNS pane and it still works! (Even if you restart Safari)
Seems that there is some sort of bug here hidden in the IPv6 thingy and all I know is that if you do this it sorts out the problem (did it for my iMac G5 and partners MacBook) but I have absolutely no idea why? Someone technical can hopefully shed a light on this..

Yang: I entered Terminal and entered the command you recommended: "dscacheutil-flushcache"and I got the response command not found.
I have never used Terminal before so probably I am missing something along they way. Where there any additional steps I need to do attempt this fix?
Thanks, Bob

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