interesting about OSX, NAT64 prefix discovery

[Rui Paulo]

On 14 Oct 2013, at 01:57, Mikael Abrahamsson <swmike at swm.pp.se> wrote:

> On Mon, 14 Oct 2013, Simon Perreault wrote:
> 
>> Did they implement the NAT64 prefix discovery heuristic? That would be
>> great!
> 
> Well, I dont know, but this is what happens: THis is without entry in /etc/hosts:
> 
> dhcp-28-70:~ mikaelabrahamsson$ ping6 swm.pp.se
> PING6(56=40+8+8 bytes) 2001:67c:64:47:b501:73ad:3c6:867c --> 2a00:801::f
> 16 bytes from 2a00:801::f, icmp_seq=0 hlim=49 time=78.654 ms
> 16 bytes from 2a00:801::f, icmp_seq=1 hlim=49 time=81.850 ms
> ^C
> --- swm.pp.se ping6 statistics ---
> 2 packets transmitted, 2 packets received, 0.0% packet loss
> round-trip min/avg/max/std-dev = 78.654/80.252/81.850/1.598 ms
> 
> dhcp-28-70:~ mikaelabrahamsson$ host swm.pp.se
> swm.pp.se has address 212.247.200.143
> swm.pp.se has IPv6 address 2a00:801::f
> 
> Then I put
> 
> 212.247.200.143    uplift.swm.pp.se uplift swm.pp.se webmail.swm.pp.se
> 
> in /etc/hosts and I get:
> 
> hcp-28-70:~ mikaelabrahamsson$ ssh swmike at swm.pp.se -v
> OpenSSH_5.9p1, OpenSSL 0.9.8y 5 Feb 2013
> debug1: Reading configuration data /etc/ssh_config
> debug1: /etc/ssh_config line 20: Applying options for *
> debug1: /etc/ssh_config line 53: Applying options for *
> debug1: Connecting to swm.pp.se [212.247.200.143] port 22.
> debug1: connect to address 212.247.200.143 port 22: No route to host
> debug1: Connecting to swm.pp.se [2001:db8:624::d4f7:c88f] port 22.
> debug1: Connection established.
> debug1: identity file /Users/mikaelabrahamsson/.ssh/id_rsa type 1
> 
> It's a bit strange, Chrome won't connect either, telnet doesn't work, but Safari does work, Firefox connects but it takes a very long time (minutes). So perhaps ssh and Safari/Firefox uses a different API call than the others?

Are you sure no DNS queries were sent ? It might be cached by mDNSResponder. You can reset the cache with sudo killall -HUP mDNSResponder.

--
Rui Paulo