Comcast's IPV6 DNS servers not working - XFinity

#1
Most DNS requests to Comcast's IPV6 DNS servers are timing out:

>server 2001:558:feed::1
DNS request timed out.
timeout was 2 seconds.
Default Server: [2001:558:feed::1]
Address: 2001:558:feed::1

> www.google.com
Server: [2001:558:feed::1]
Address: 2001:558:feed::1
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to [2001:558:feed::1] timed-out

Same happens with 2001:558:feed::2. I can ping both DNS servers.
 
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