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Questions tagged [ipv6]

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How does one find their DUID for IPv6 on MacOS?

I recently was setting up IPv6 on my home network and while setting up several nodes noticed that the DHCPv6 server was using these DUID strings to identify clients as it assigned IPv6 IPs to the ...
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  • 4,088
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1 answer
315 views

How do I force IPv4 or IPv6 for a Wi-Fi network on iOS 15?

I need to use a sofware that only supports IPv4 on iOS 15, but my ISP provides IPv6 addresses by default. How do I force my iOS device to use IPv4 only on a certain Wi-Fi network, or the other way ...
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  • 1,076
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0 answers
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Determine MTU of an IPv6 path

For IPv4, MTU can be found with sweep-ping: ping -g 1464 -G 1508 -c 2 -h 1 -D 1.1.1.1 or by manually decreasing ping after a huge ping: ping -c1 -D -s 1472 1.1.1.1 For IPv6, the easiest method I'm ...
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  • 207
1 vote
1 answer
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MTU sweep for ipv6 ping6?

The answer to Is there an equivalent utility to Linux's tracepath for OS X? suggests to use ping -g 1444 -G 1508 -c 2 -h 1 -D example.com How do I modify this for ipv6? Tried ping6 -g 1444 -G ...
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  • 207
2 votes
1 answer
434 views

No IPv4 access on my Macbook Pro, only IPv6 works

MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports) / macOS Big Sur 11.4 I'm experiencing a weird WiFi issue at our remote office where I'm only able to connect to IPv6 addresses and not IPv4 ...
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2 votes
0 answers
52 views

Why am I getting a delay using IPv6 in ping6, traceroute6, nslookup

I have just switched to 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 ...
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0 answers
127 views

How does iOS decide between DHCPv4 and DHCPv6

If I understood correctly, when a device connects to a network (wireless in my case), it will send both a DHCPv4 and DHCPv6 (if supported). I've setup openwrt on my router in order to view the DHCP ...
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6 votes
1 answer
2k views

autoconf temporary ipv6 address

My mac machine has been assigned two public ipv6 addresses with same prefix. One is autoconf temporary and the other is autoconf secured. I know about secured one but what is the purpose of autoconf ...
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1 vote
1 answer
330 views

Will FaceTime perform better with IPv6 enabled?

I find FaceTime works much better on 4g than my home wifi despite good upload bandwidth. I suspect variable latency is the cause. My router and Orbi does not have Ipv6 enabled. If I can get V6 working ...
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airport express IPv6 issue?

I'm considering that it can be an issue with airport express IPv6 but not sure, might be another unrelated thing which then I would like to know more about. To put it simple I'll say the following: ...
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Setup an IPv6 6in4 Tunnel on macOS High Sierra 10.13

I'm trying to setup a 6in4 tunnel from my home with IPv4 only addressing to a Hurricane Electric tunnel for some IPv6 testing. I tried to create a new Interface: System Preferences > Network > [...
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  • 354
1 vote
1 answer
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disable temporary autoconf inet6 address

My OS X machine gets assigned two public IP addresses from Android 7.1.1: % ifconfig en0 en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 8c:29:XX:XX:XX:XX ...
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  • 918
10 votes
3 answers
8k views

IPv6 dns resolution on macOS High Sierra

My ISP provides me only with an IPv4 address. After setting up a connection to my university OpenVPN server, I get an IPv6 address. With an example IPv6 address www6.fit.vutbr.cz I can: host www6....
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  • 101
2 votes
1 answer
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Accessing an ipv6 NAT64 connection on my iPad, broadcast from Mac

I'm trying to follow this tutorial on how to setup an ipv6 wi-fi connection, so I can test my app: http://www.brianjcoleman.com/tutorial-how-to-test-your-app-for-ipv6-compatibility/ If I don't tick ...
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6 votes
1 answer
904 views

How to use rsync via ssh with IPv6 LLA (link local address) addresses on OSX?

I'm using OSX High Sierra and bash. I'm trying to use a backup script based on IPv6 LLA (so I always reach the server, without DHCP, names etc). With IPv4 this works: rsync -e ssh /src/dir/* user@...
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  • 181
5 votes
2 answers
1k views

How to add AAAA flag (IPv6) to DNS resolver configuration on Sierra?

I have working IPv6 interface with /64 prefix. It means I can connect to direct IPv6 addresses through browser but can't connect to IPv6 hosts like testv6.madore.org. The issue is in DNS ...
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3 votes
0 answers
886 views

macOS Sierra/High Sierra and IPv6 DNS via SLACC

In my (dual stack) network, a router provides IPv6 addresses and DNS servers (RDNSS) via router advertising. There is no DHCPv6 server running and I want my mac to accept the DNS servers being ...
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  • 31
1 vote
1 answer
1k views

IPV6 ip address not able to connect from my app when NAT64/DNS64 is connected

SetUp Details :- IpV4 ethernet cable is connected to MAC machine. Now as per apple documentation steps are followed. Where DNS64/NAT64 is created and hotspot is created. Device is connected to wi-...
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  • 13
0 votes
1 answer
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ifconfig showing ipv6 address while networksetup doesn't

when using ipconfig utility, it's showing ipv6 address: inet6 fe80::1c00:23f2:b82e:fc8c%en0 prefixlen 64 secured scopeid 0x4 But when using networksetup -getinfo %networ service name% it ...
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2 votes
1 answer
551 views

Disable DNS assignment with Airport Extreme IPv6 tunnel

I've got an IPv6 tunnel from Hurricane Electric, configured into one of my Apple Airport Extremes (which is otherwise setup in bridge mode). That's all fine, except that in the IPv6 Route ...
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  • 101
1 vote
0 answers
1k views

Safari can't access to ipv6 address whereas Chrome can do

When using Cisco OpenConnect client there are no problems resolving IPv6 only sites. However while using open source openconnect command line client from brew Safari can't resolve IPv6 only sites. ...
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0 votes
1 answer
3k views

Sierra has changed IPv6 link-local addressing. Why/how?

The permanent ipv6 address of my machines changed with the advent of macOS Sierra. Note that we're not talking about the privacy enhanced temporary addresses. What I'm talking about happens even with ...
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0 votes
1 answer
955 views

NAT64 enabled on OSX, iPhone still gets an IPv4 IP Address

I've enabled the "Create NAT64 Network" option in network "Sharing". I connect my iPhone and it seems to work (tested in Safari). However, when I look at the Wi-Fi information for the connection my IP ...
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2 votes
0 answers
648 views

native IPv6 support over PPPoE in Apple Airport Extreme

Is there a technical reason why Apple does not support native IPv6 over PPPoE in their Airport Extreme Basestations? AFAIK here in Germany, all ISP using it and all modern routers seem to support it. ...
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5 votes
2 answers
8k views

Which command to only output the IPv6 routing table?

$ netstat -nr is great for outputting the Mac OS X IP routing tables. However its output is long as it contains both IPv4 and IP6 routing tables. Sometimes I wish to output only the IPv6 routing ...
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3 votes
2 answers
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Can IPv6 be disabled on an iPad?

TL;DR: Can I disable IPv6 on an iPad? Strange issue that I've just figured out. For months I've been seeing content show up in Netflix that should be unavailable to me (I'm in Canada), or things that ...
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  • 855
0 votes
1 answer
10k views

Is it safe to turn off Block IPv6 on my Airport Extreme

I think I am having issues trying to connect to servers that are using IPv6. Mainly related to local web development. On this Github Issue relating to my specific problem and they recommend ...
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  • 3
22 votes
2 answers
58k views

Why do I have 2 IPv6 addresses?

If I go to System Preferences > Network > Advanced it is shown that I have 2 different IPv6 addresses (both with a 64-bit prefix). Why is so? If I type ifconfig | grep inet on the terminal, it ...
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3 votes
3 answers
2k views

Can't set IPv6 mode on Airport Extreme

I have a AirPort Extreme 802.11n (5th Generation) connected to a Zyxel VMG1312-B30A modem. My ISP is Deutsche Telekom with VDSL. For quite some time I was able to use native IPv6. But this stopped ...
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2 votes
2 answers
2k views

Browsing IPv6 only

I would like to check some websites by using IPv6 only: not only connecting with an IPv6 address but also checking that every other following connection (e.g., for embedded content with iframes) is ...
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  • 8,192
6 votes
2 answers
8k views

El Capitan "Create NAT64 Network" - connection issues

I am trying to test apps for IPv6 according to Apple's documentation at Supporting IPv6 DNS64/NAT64 Networks. I have difficulties connecting from the iPad to my app server. My Network Layout: The ...
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4 votes
1 answer
1k views

Why do I have IPv6 listeners when IPv6 is disabled?

I'm working under OS X 10.8.5, fully patched. I have IPv6 disabled under Network Settings: I also have unneeded network interfaces disabled: While troubleshooting an OpenSSH server issue, I ...
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2 votes
1 answer
2k views

MacBook with 10.6.8 Snow Leopard freezes after Wi-Fi connection

I recently switched service providers and received a new router. My phone and old Windows computer connect fine, but my MacBook freezes (rainbow wheel starts going around forever after about 2 mins of ...
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3 votes
1 answer
6k views

Can I turn off IPv4 and just use IPv6 on my iOS device?

I am connected with my iPhone 6 / iOS 9.0 to an IPv6 network created following this article. When I take a look at the console of my device, I see Aug 11 12:15:07 titos-iPhone kernel[0] <Notice>...
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6 votes
1 answer
863 views

How to access App Store using only IPv6?

There must be people curious about why I have to do this, so let me explain the reason first—Now I'm in an institute of Chinese Academic of Science, and the network environment is irritating. I'm ...
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  • 263
1 vote
1 answer
8k views

SSH with ipv6 working only if I pass %en0 with my ipv6 address

I am trying to ssh with Mac OS X (10.10.1 Yosemite) terminal using ipv6. If I use command like ssh username@ipv6_address It's not working and I am getting error "No Route to Host". But If I use ...
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  • 113
0 votes
1 answer
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SSH using IPV6 getting error "No Route to Host" On My Mac Machine

I am trying to ssh with ipv6 in my mac machine but I am getting error "No Route to Host". I can it successfully with ipv4. Can anyone guide me please if it require any network setting or else? I am ...
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  • 113
1 vote
1 answer
1k views

How can I make Ruby net::http stop stalling on ipv6?

There are some tools critical to my workflow that talk to www.pivotaltracker.com using ruby. Some combination of updating from Ruby 2.1.2 to Ruby 2.1.3, recent os x system updates, and brew updates ...
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2 votes
1 answer
295 views

click select IPv6 address in terminal

When clicked on IPv4 address in terminal window, it gets selected as a whole, not a single octet. The same action does not work for IPv6 adress, it does not get selected. I assume there is some ...
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  • 421
4 votes
1 answer
12k views

How to configure ipv6 on Mac OS X to ping its own address?

I'm trying to configure ipv6 on my local wifi network. I've already succeeded with ipv6 from my router (Zyxel Keentic Giga) to ipv6 internet via built-in 6to4 tunnels and the router can ping6 to ...
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9 votes
1 answer
316 views

Does macOS support AnyIP?

I would like to assign a complete block to my Mac as described in this question: Can I bind a (large) block of addresses to an interface? There it is explained that AnyIP is supported for IPv6 by the ...
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4 votes
0 answers
395 views

IPv6 quits working after using VPN

My Macbook Pro running Mavericks picks up my ISP's (native) IPv6 support with automatic configuration just fine on bootup. I'm using an AirPort Extreme 802.11ac (2013) with default settings. If then ...
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  • 554
1 vote
1 answer
665 views

Cannot change IPv6 Mode on my Airport Extreme (5th generation) using Ariport Utility 6

My provider recently added support for IPv6 and I wanted to configure it on my side. Unfortunately Airport Utility does not allow me to select appropriate IPv6 mode and I'm stuck with the tunnel mode ...
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  • 344
1 vote
3 answers
6k views

How do I ping6 a link local address on OSX?

On linux I see all connected IPv6 addresses to my wlan adapter with ping6 ff02::1%wlan0 | head but how can I achieve this on OSX?
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  • 649
3 votes
1 answer
582 views

Mac Mini Server running Mountain Lion (10.8.2) is freezing during boot (last line: IPv6 packet filtering initialized)

Starting in verbose mode (Cmd+V), the last line I see on the console is: IPv6 packet filtering initialized, default to accept, logging disabled This happens regardless of having an ethernet cable ...
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  • 131
1 vote
2 answers
2k views

Configuring predictable IPv6 addresses for laptop client

I recently set up IPv6 for my home network via a tunnel. I have a /48 subnet and have assigned manual IPv6 addresses to my stationary Macs. I would like to set up my laptops to get a dynamic IPv6 ...
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1 vote
1 answer
1k views

Airport Express with IPv6 tunnel and dynamic IP address

I'm trying to set up an IPv6 tunnel through HE, using an Airport Extreme (7.6.1). I got it to work once, but have a real chicken and egg problem: I'm on a PPPoE internet connection, the Airport ...
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  • 1,352
9 votes
3 answers
10k views

Does OS X have a builtin DHCPv6 client?

Upon testing a within a standalone network with just a DHCPv6 server on it and several client computers with different operating systems, OS X 10.7.4 fails to automatically obtain an IPv6 address from ...
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  • 12.5k
5 votes
1 answer
4k views

How does Back To My Mac work without UPnP or NAT-PMP?

Back To My Mac (BTMM) used to require UPnP or NAT-PMP on your router to work, but at some point this changed and it can work (albeit slowly) without those. BTMM (usually?) works by setting up an ...
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  • 8,232
6 votes
1 answer
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How can I see my IPv6 neighbors?

On a Linux machine, I can see my IPv6 neighbors using the following command (Also see the Linux IPv6 HOWTO: # ip -6 neighbor show 2002:333:333::1 dev eth1 lladdr 00:12:1e:33:AA:BB router ...
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