Questions tagged [ipv6]
Questions about IPv6, the newest version of the Internet Protocol. This tag should be used when asking about personal/home network IPv6 addressing, or basic IPv6 knowledge. Questions related to company-grade IPv6 networks are off-topic and should be asked on Network engineering SE.
1,235
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Why is urllib urlopen + ipv6 unusable?
$ time curl --silent https://google.com >/dev/null
real 0m0.753s
user 0m0.070s
sys 0m0.021s
$ python
Python 3.11.3 (main, Apr 5 2023, 00:00:00) [GCC 12.2.1 20221121 (Red Hat 12.2.1-4)] ...
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1
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32
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Public IPv4 and IPv6 addresses are located in different countries while using VPN
I am currently physically located in Mainland China, so I use a VPN by a European university. With this VPN, I can normally access censored sites and many websites appear to locate me in Europe, but ...
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1
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22
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Set ufw to allow incoming traffic from common IPv6 prefix
I want to set up IPv4/IPv6 dual stack on my internet connection and my local network. To that end I want to change the firewalls on some of the machines to allow incoming traffic for certain ...
- 331
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1
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23
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Poor Linux IP tunnel performance
I'm attempting to setup a protocol 41 tunnel between 2 networks over the internet using the Linux ip6tnl interface. Running iperf between the 2 networks directly over the internet results in around ...
- 101
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24
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Mobaxterm is crashing on DNS ipv6 connection
When I connect using ipv4 to my server, using DNS or not, or by ipv6 without DNS, the connection is done smoothly.
However, when I use DNS and ipv6, after the banner message, the Mobaxterm freezes and ...
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2
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48
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How to interpret Open | Filtered status of port scan?
I have Softether VPN server running on Windows 10 PC. My ISP offers me CGNAT (IP4) and GUA (IP6).
I have configured it to accept L2TP Ipsec with preshared key.
Now I am checking the open port status ...
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40
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Windows 10 and IPv6 link-local address
As far as I know, IPv6 is calculated from the MAC Address (EUI-64 Method) and it is autoconfigured whether there is a DHCP or not.
So I enabled TCP/IPv6 on my Windows 10 and used ipconfig /all, but ...
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How can a faulty DNS entry in the router's RA cause WiFi disconnections on a phone?
I have a home network with a router provided by the ISP (Free in France). This router supports IPv6 and broadcasts RA which includes the DNS to use. It also offers DHCP services and forwards DNS ...
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How can I overwrite the default gateway which radvd is advertising
I have flat network with 7 nodes, one of the nodes act as the DHCPv6 server and also runs radvd.
When used like that, radvd will use the helper node (local-link) IP as the gateway when sending the RA.
...
- 481
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37
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Windows server ipv6 dhcp
I'm sorry but i'm stuck since a lot of time now.
I tried to make a scope for ipv6 at my home, i have a windows server 2019 machine that manages a lot of things.
I don't understand why but i can't have ...
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132
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Trying to configure iptables IPv6 in Slackware 15
Hello I'm new to information security, I'm studying. I've improved the IPv6 firewall, I've now added IPv6 support, however I don't have any knowledge of IPv6, I would like someone to help and tell me ...
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1
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How to disable/prevent default ipv6 route with systemd-networkd
I'm using systemd-networkd on my linux router, and this is ip -6 route output:
::1 dev lo proto kernel metric 256 pref medium
240e:3b0:3041:4df::/64 dev ppp0 proto ra metric 1024 expires 2591826sec ...
- 41
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46
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Define route that is preferred "always"
I'm currently implementing an IPv6 only service. Since it should also be consumed using IPv4, I'm implementing a translator.
In the translator server, I need to add a route to a different netns to be ...
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37
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How to check which IPv6 is being announced in my network on Linux
My ISP provides IPv6 connectivity, but they say nothing about prefix length. However, my router must be announcing some prefix to the network for IPv6 configuration to take place.
Is there a command ...
- 103
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24
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how to route traffic of google.com from ipv6
im running a openvpn server on rocky linux 9 server. it has both ipv4 and ipv6 public ip, however im trying to add a static route so i connect to google.com using ipv4.
something like this would work :...
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59
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What causes IPv6 ping of linux guest to drop packets in cyclical fashion on Win 10?
I'm trying to ping a linux virtual machine from a Win 10 host. IPv4 works perfectly fine, but trying to use a local IPv6 address drops packets cyclically in the following pattern.
Does anybody have an ...
- 507
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76
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Configure an Windows 10 host to acquire IPv6 using stateless DHCPv6 despites router configured as statefull
I have one home router that provides no advanced configuration option for IPv6 DHCP (only a checkbox IPv6 enable/disable, so I cannot configure it to use stateless dhcp). The default behavior of an ...
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1
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52
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How do I prevent ipv6 addresses being used in a mixed ipv4 ipv6 environment?
I have a raspberry pi in a closed network at a remote site. The closed network has a Teltonika RUT-951 router that connects back to base over a VPN across the remote site's LAN and Internet; with a ...
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1
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32
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How to add IPv6 static route via host on other network?
I have a bunch of IPv6-only hosts in location A. To let them connect to IPv4-only hosts, I have set up a NAT64 gateway on a dual-stack host in location B. Now I want the IPv6-only hosts in location A ...
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146
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Which inbound/outbound rules are necessary for stable IPv6 connectivity in Windows 10/11?
I'm experiencing an issue with Windows 10 where IPv6 connectivity becomes unstable over time. Initially, IPv6 works as expected, but after a while, it stops working. Upon investigation, I've ...
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167
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IPv6 and/or 'dnsmasq' for DNS | DHCP also
Preface
I'm far from being a network manager, and not really know much about IPv6 (yet), but slowly I have to.
I have an RPi4 based server in my home, basically for Home Assistant smart-home ...
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1
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96
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mariadb 10.1: Access denied for user, from ipv6 only
Adding an access record with host %, or with host smtp.acme.com does not provide access when accessing via IPv6. Nor does using the specific IPv6 address. I only get 'access denied'.
The SQL server is ...
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47
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FedoraServer ssh traffic on ipv6 blocked
I have my domain setup for ipv6 as well as ipv4. For accessing the https site it all works well.
But when trying to connect to ssh via ipv6 it does not work. You can see in the log below, my ssh ...
- 21
1
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1
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104
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Dynamic DNS NAT for IPv4 and AAAA for IPv6 - is it possible?
I have a router named alice, and servers named bob and charlie. I want to be able to use IPv6 to go directly to alice, bob, or charlie, and I want IPv4 to continue to work, giving me alice's address ...
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16
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Bound extra ipv6 adress
Im new to Linux, and i'm still learning to setup everything.
I have main adress ipv4, i would like to add extra IPv6 adress to my server.
Im using Ubuntu 20.04.
My provider gave me IPv6 adress: 2a01:...
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2
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157
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Determine which IP address will be used for default route in Powershell
There could be multiple addresses of one Network Interface Card in Windows, such as global unicast IPv6 addresses assigned via DHCPv6, SLAAC, temporary IPv6 or manually, etc. At the same time, there ...
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52
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Do you have to join the broadcast group for IPv6 multicast?
When a client joins a network, is the client included in the ff02::1 IPv6 multicast group, which "broadcasts" to all nodes on the segment. OR, do I have to subscribe to the group using ...
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Configure an IPv6 tunnel to use its routed IPv6 network
When creating an IPv6 tunnel with tunnelbroker.net, the Tunnel Broker service assigns you a client IPv6 address to be used on the router and a routed IPv6 network to be used by the systems in the ...
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139
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IPv6 behind Hyper-V external switch doesn't work
I've setup a an (L)Ubuntu VM under Hyper-V Win11 Pro machine with external virtual switch but I can't get IPv6 to work...
The network connections tab shows 3 (relevant) interfaces: Wifi (the actual ...
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1
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42
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nmap cannot check ipv6 global ip on localhost
If I use nmap like this (the AAA record of the website redirects to this machine) :
nmap -6 -sV mywebsite.com
nmap seems to access all ports like it was a localhost scan. However if I do :
nmap -4 -...
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40
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tmux "freezes" when connecting via IPv6 (but not via IPv4)
I connect from my Win 10 host to a Virtualbox Debian (bullseye) guest via zeroconf/mDNS - ssh - tmux. When I use IPv4 everything works as expected, with IPv6, tmux "freezes" after a couple ...
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What is the easiest way for me to access my IPv6 server from IPV4?
I have a Nextcloud server that works fine, but I noticed that I cannot access it from certain places. What all of these have in common is that they seem to use IPv4.
This would make sense, as IPv4 is ...
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1
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52
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Why Ubuntu prefers RA route to directly connected interface?
I have the following topology:
There is 2 routers OTBR1 and OTBR2 that have an interface wpan0 connected to the same
fd71:f19:d5f5:1::/64 network.
They both advertise this route through RA on the ...
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How to disable IPv6 on a logical/vlan/sub interface?
On Linux CentOS7, sysctl fails disabling IPv6 on a logical/vlan/sub interface :
$ ip -6 -o a show dev bond0.53
20: bond0.53 inet6 fe80::b283:feff:fee6:ba1/64 scope link \ valid_lft forever ...
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45
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Is it possible to send packets to network interface in an android device from host computer by network interface name and MAC address?
Recently I saw a demonstration to fuzz IPv6 network interface of an android device
The tool in use was fuzz_ip6 from https://github.com/vanhauser-thc/thc-ipv6 And the tool was executed in the form of ...
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228
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PFsense not routing from wan to ipv6 lease
I have a pfsense router connected to starlink internet. It's currently providing me a /56 that I'm using to provide IPV6 leases via the DHCPv6 server. I have serval devices that have active IPV6 ...
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exim mail server send receive ipv6
IPv4 mail is working fine with DKIM, SPF, etc. I can send to Gmail no problem and all validations pass. Hotmail/Outlook also work after doing validation with them.
I can send IPv6 mail through my ...
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Windows 11 static IPv6 source address
I configured my Hurricane Electric IPv6 tunnel, and all is working well with my router, router advertisements, auto configured addresses, etc.
I want a static source address on IPv6 traffic to make ...
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39
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Determine LAN and WAN IP address
Is there a simple way to determine the LAN and WAN IP address of a connected device?
I frequently need to check the local and external IP addresses of devices, especially mobile devices, but I tend to ...
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2
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Can I access IPv4 DNS resolver from IPv6-only network?
Everyone knows that it is not possible to run nslookup command through an ipv6 resolver with ipv4-only host. For instance the following command will result error on ipv4 host:
nslookup facebook.com ...
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114
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Getting around DS-Lite with reverse proxy in place
I have some things running on my home network that are available over the internet. But as my ISP does not provide me with a public IPv4 (DS-Lite), I can't reach them when only IPv4 is available, ...
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Can I proxy mumble traffic from IPv4 to IPv6 with socat?
I have an IPv6-only Mumble server at home (because I have no public IPv4). I want to make it accessible to IPv4-only users with a small VPN.
The VPN has a public IPv4 that I can ping
The VPN has IPv6 ...
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1
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2
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280
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Disabling IPv6 connectivity only for specific Wi-Fi network (Windows 10)
Today, I've successfully set up a home VPN router with OpenWrt and OpenVPN.
Since my VPN provider only supports IPv4 connections, I don't want network traffic to leak out and I've disabled IPv6 by ...
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177
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How can I get another IPv6 address on every port on 3proxy
I don't know much things in networking. I hope I can describe my problem...
My main IPv6 address is: 2a03:XXXX:X:XX::XXX:2
I want to bind 1000 port to 2a03:XXXX:X:XX::XXX:1
I want to bind 1001 port to ...
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IPv6 Wireguard ULA Routing
I would like to route traffic between two devices when they're both on NAT connections. They are both connected to a wireguard VPN on a VPS, but they cannot ping each other.
On their wireguard ...
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ISP switched me to Dual-Stack Lite, can't reach my network remotely with IPv6. Used to work with IPv4
I have a Raspberry Pi I use for TeamSpeak, I could simply connect to it.
My ISP gifted me with Dual-Stack Lite taking away the IPv4 address I had.
Is there a way for me to simply connect again to my ...
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Can I get inadyn to dynamically update no-ip.com with both my IPv6 and IPv6 address?
My ISP provides my (well, my router) with both an IPv4 and an IPv6 address. However, it seems inadyn client - only registers my IPv4 address with my dynamic DNS provider, no-ip.com. Is it possible to ...
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35
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Firewall rule for divert socket on Ubuntu
I have been trying to follow this to make a divert socket. Unfortunately, the How-To has a dead link to patched code, so I can't inspect what changes were made. I did see divert in the Ubuntu man ...
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48
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Quaggga OSPFv3 won't configure routes
I'm trying to configure Quagga to use OSPFv3 to create proper IPv6 routes between two OpenWrt routers running OpenVPN (tun mode). I know the tunnel is working properly because it works if I configure ...
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Is the following IPv6 address valid?
i'am asking for a friend. Really :-)
Given the exam question:
Is the following IPv6 address valid?
2001:0DDB8:0:0:8:800:200C:417A
RFC4291: Text Representation of Addresses
I say no since the second ...
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