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Delays with MacOS in IPv6/4 dual stack

planetf1

Pro Member
Hi,

I have just switched to Zen -ie an Internet provider offering full dual stack IPv4/6 support, using a Fritzbox 7530 and am experiencing a delay , seemingly in name resolution, when using 'ping6'.

The same configuration is also supporting iOS, windows, linux, raspberry pi - and these devices all seem to work fine.

The symptom is:
  • 'ping www.ibm.com' -> instant response, start getting icmp request/response
  • ping6 'www.ibm.com' -> About a 3-4s delay after typing the command before the pings start
ie:

$ ping6 www.ibm.com
... delay here ...
PING6(56=40+8+8 bytes) 2a02:8010:687f:0:2dbc:1ea2:a301:b111 --> 2a02:26f0:e8:491::b3a
16 bytes from 2a02:26f0:e8:491::b3a, icmp_seq=0 hlim=58 time=11.621 ms
16 bytes from 2a02:26f0:e8:491::b3a, icmp_seq=1 hlim=58 time=10.486 ms
16 bytes from 2a02:26f0:e8:491::b3a, icmp_seq=2 hlim=58 time=11.994 ms

The same behaviour is seen for other IPv6 sites such as ipv6.google.com

Using 'nslookup' I also get a delay:

$ nslookup
... delay actually occurs here
> ipv6.google.com
Server: 192.168.178.1
Address: 192.168.178.1#53

Non-authoritative answer:
ipv6.google.com canonical name = ipv6.l.google.com.
>

That delay is almost as if it's reverse resolving itself - or a localhost issue?
  • All the ipv6 testers I've tried in a browser suggest my IPv6 config is fine, sites reachable
  • I don't notice delays in google chrome
  • If IPv4 is disabled no delays occur
  • The router is set to automatic IPv6 (with fast commit)
  • The macOS Wifi adapter is set to automatic for ipv6 (and dhcp for ipv4)
scutil --dns ends with

DNS configuration (for scoped queries)

resolver #1
search domain[0] : fritz.box
nameserver[0] : 192.168.178.1
nameserver[1] : fd00::2e91:abff:fe55:2d26
if_index : 5 (en0)
flags : Scoped, Request A records, Request AAAA records
reach : 0x00020002 (Reachable,Directly Reachable Address)

So ipv6 addresses are being requested

/etc/hosts has

##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
##
127.0.0.1 localhost
::1 localhost
fe80::1%lo0 localhost
# End of section
192.168.178.48 pi4

Any ideas why the delay?

Once past that ipv6 and ipv4 are both working fine it seems (from limited tests so far)
 
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