Tristan Horn tristan+v6o at ethereal.net
Tue Aug 22 00:29:39 CEST 2006

On Mon, Aug 21, 2006 at 02:29:10PM -0700, Doug Barton wrote:
>> www.arin.net has address 2001:500:4:1::80
>> www.arin.net has address 2001:440:2000:1::18
>if I wait a really long time (45 seconds to a minute), 'telnet -6 
>2001:500:4:1::80 80' eventually succeeds

I wonder if that delay is due to reverse DNS.  The two IPv6 NS RRs for are:

  chia.arin.net.   IN AAAA 2001:440:2000:1::21
  ns-sec.ripe.net. IN AAAA 2001:610:240:0:53::4

Since reachability to 2001:440:2000:1::16/125 is shown to be 
problematic, and if your resolver is preferring AAAA over A while doing 
reverse DNS lookups, could this explain the long delay before the telnet 
connection opens?

Standard disclaimer: I've never used telnet -6; I don't know which 
version of telnet you're using (maybe they've finally fixed this 
problem), etc. :)


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