Open DNS is domain name service. Your router is trying to resolve (for example) "ubuntuforums.org" to an IP address because routers only understand IP addresses. Hence every time you go to a new website, your router tries to resolve the name to an IP. If you're browsing for a while you can imagine that you'd generate a lot of traffic to DNS.
If you don't understand ICMP type 3, have a look at this:
http://www.networksorcery.com/enp/pr.../icmp/msg3.htm
Basically the ICMP type 3 packets indicate that the destination is unreachable for these particular packets. You can see what's going on yourself with
Code:
traceroute 208.67.220.220
which will show you what routers your packet hits out on the interwebz as it travels to San Francisco (apparently where that IP for Open DNS lives).
This link has more details about ICMP type 3 packets if you want to define precisely what's causing the error:
http://support.microsoft.com/kb/325122
Have you configured your router to use Open DNS? That should resolve the problem.
http://use.opendns.com/
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