Questions tagged [ipv6]

Internet Protocol version 6 (IPv6) is the latest version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet.

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ICMPv6 send Multicast Listener Report Message and Neighbor Solicitation

I am configuring ucarp on two on my pc router ie master and slave. Master is turned off and then turned on, recorded in tshark slave application there is icmpv6 multicast listener report message and ...
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Disable DHCPv6 while not disabling SLAAC in network manager

I have two ipv6 addresses, one is from DHCPv6 (/128) and one from slaac (/64), with nmcli connection modify iface ipv6.method "auto" nmcli connection modify iface ipv6.addr-gen-mode "eui64" ...
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Certain ipv6 hosts hang on certain machines on the network

I have this annoying issue where some of the machines on my network will hang when looking up connecting to certain IPv6 addresses, in particular the ones from Google (but I've also seen issues with ...
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linux bridging and ipv6 neighbor discovery

I have client and server ipv6 applications, each uses a virutal TAP interface and a user space Ipv6 stack. I connect the two tap interfaces with a bridge, and enabled ipv6 forwarding, but I'm finding ...
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ip6tables - IPv6 DNAT to localhost

I have the following IPv4 rules: iptables -t nat -A PREROUTING -d "server ipv4" -p tcp -m tcp --dport 80 -i eth0 - j DNAT --to-destination 127.0.0.1:55555 iptables -P INPUT ACCEPT In addition, I ...
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Reading MLDv2 queries using an IPv6 socket

I have mrd6 installed on my raspberry pi. It registers with a local interface (tun0) and periodically transmits MLDv2 queries over it. According to [RFC3810], MLDv2 message types are a subset of ...
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Are virtual devices in Linux ever assigned duplicate MACs (actually duplicate IPv6 link-local addresses)?

I'm creating a completely virtual network between different network namespaces on the same host. I'm going to be telling programs to use IPv6 link-local addresses for networking. One problem I ...
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Debian, two IPv6 addresses on single interface

I need to add the second IPv6 to the single interface in Debian Stretch. When using IPv4, this is simple becasue multiple inet static definitions works, i. e.: iface enp5s0f0.10 inet static ...
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Why does adding an IPv6 address break IPv6 (CentOS)?

I have several servers with IPv6. For some reason, on this new server, I'm having a problem. IPv6 is working until I add more addresses. Here's the output of ifconfig before adding a new IP: lo: ...
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851 views

IPv6 custom loopback address and ping it from another host

Can I or how can I add custom IPv6 address on loopback interface of the host A and ping it from the host B? I've tried to add something like this ::ffff:5:4:3:2, however ip -6 route says, that this ...
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Add ipv6 static route without subnet nmcli

What is nmcli command to implement the following: ip -6 r add 2a00:xxxx:xxxx::1 dev eth0 RedHat documentation insists on using network specification but I can't produce another working ip -6 r add ...
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Connect wlan0 to HE-tunnel IPv6 Debian

Hello guys my first post on this forum so please give me feed back if I´m posting in a stupid or complicated way and have patience whit my bad spelling do I´m dyslectic. I made this illustration of my ...
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IPv6 packets injected on tun interface go up to IPv4 stack

I have a problem about tun interfaces and the IPv6 handling by the kernel. I'm trying to provide IPv6 to the end-users of my network over a pure IPv4 network. Summarizing (just a tunneling background ...
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Unable to ping IPV6 default Gateway on OpenSuse 13.2

I have configured IPv4 and IPv6 addresses on eth0 on OpenSuse 13.2 and edited /etc/sysconfig/network/ifcfg-eth0 to support IPv6 The contents of my file are as below BOOTPROTO='static' BROADCAST='' ...
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Should DNS (PTR Records) be configured differently for different ipv6 networks?

I am configuring DNS forward and reverse lookup for IPv6(Redhat). For both /64 and /120 prefix i am using below configuration for PTR records. for address 6b00:8a00:a000:11a1::a2b:1c9f (Only a ...
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Raspbian Jessie: /etc/network/interfaces doesn't apply inet6 address. How to diagnose?

I'm experiencing a strange issue, and I don't really know how to diagnose it, or how to fix it. My problem is, that the static ipv6 assignment that used to work suddenly isn't applied any more at ...
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463 views

Linux routing IPv6 packets through incorrect interface

I have a Arch Linux system where link-local packets are not being routed properly. I have 4 interfaces on this machine (wan, lan0, lan1 and lan2). All three of the lanX interfaces are bridged together....
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How to disable IPv6 ping response in Linux without firewall

How can I disable IPv6 ping responses in Linux without using the IPv6 firewall? This question covers how to do this using the IPv6 firewall via iptables, but I'm using an embedded system that doesn't ...
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ping6 error 'operation not permitted'

I am unable to ping6 my gateway or beyond. I am able to ping6 my loopback successfully, but that is all. [\u@r2d2:/root] # ping6 ipv6.google.com PING6(56=40+8+8 bytes) 2001:19f0:7000:8945:5400:ff:...
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How does s_client turn ip6-localhost into 127.0.0.1?

When I use openssl s_client and ask it to connect to ip6-localhost it actually connects to 127.0.0.1 instead of ::1. This is what I see on both Ubuntu and Debian: $ strace -e connect openssl ...
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Ipv6 Network unreachable Debian

Been trying to configure ipv6 on my proxmox server for about an hour now and I just can't seem to get it right. /etc/network/interfaces: auto lo iface lo inet loopback auto vmbr0 iface vmbr0 inet ...
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TCPDump To Capture A Tracepath6 Datagram

I'm trying to use TCPDump to capture an IPv6 datagram using: tcpdump -c 1 -i eth1 -vvvs0 ip6 and dst host H2.net2 & tracepath6 H2.net2 I'm running this script on H1.net1; R12.net1 is the ...
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Static IPv4 & IPv6 configuration on openwrt linux

The /etc/config/network file has the ipv6 and ipv4 entry for an eth0 interface. Executing ifconfig eth0 shows both ipv4 and ipv6 address of that interface as per configuration. Performing ifconfig ...
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Arch Linux sudden wifi disconnects and unable to reconnect

I have a problem with my wifi internet connection that is secured by WPA. I have moved to a new location. I had set up a working internect connection but lost the connection after about an hour and ...
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Create static ipv6 address without 'noprefixroute' using NetworkManager

I have created a static ipv6 address on my firewall (armbian) LAN ethernet. I used NetworkManager. The problem is the address shows as: inet6 2001:DB8:c101:b700::1/64 scope global noprefixroute The ...
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Kernel-based IPv6 SLAAC not working?

My ISP's DHCPv6 is broken. As a work around I figured I'd try IPv6 SLAAC since I do see router advertisements coming in on my WAN interface. I believe I've configured accept_ra, accept_ra_pinfo, and ...
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dhcpcd dhcpv6 times out after Router Advertise, never sends a DHCPv6 Request

I use a linux host as an IPv4 router and looked into enabling IPv6 (it's the future, I'm told). I already use dhcpcd as a dhcpv4 client to get an address from my ISP, so I figured I'd use it for ...
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Run script on obtaining custom vendor option in Stateless DHCPv6 client

I am using Ubuntu and this question is regarding DHCPv6. After obtaining RA (router advertisement) with O-bit ("Other configuration" flag) set to 1, an information-request is sent by the client. ...
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IPv6 Doesn't Route Outside Of Libvirt Network

I have VM which has a single interface that itself only has IPv6 available from libvirt's dnsmasq: 2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default ...
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Turning off ipv6 in CentOS 7

I am attempting to reduce network traffic. Every time httpd on our CentOS 7 box makes a dns query, I can see that both an A and an AAAA request type hitting our internal dns server. Since we are not ...
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How to connect ipv6 address with ssh?

My local network is simple. sudo ifconfig enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.31.52 netmask 255.255.255.0 broadcast 192.168.31.255 inet6 ...
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How to establish an ip tunnel to multiple addresses?

I want to establish a tunnel (ip4ip6) to multiple IPv6 addresses. I'm trying to do something like this: ip tunnel add sometunnelname mode ip4ip6 local 2001:db8:abab:fefe::1 remote 2001:db8:abab:fefe::/...
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Losing IPv6 connection after starting OpenVPN

I am running a Pi-Hole Server on a VPS instance. To protect it from being an open relay i configured OpenVPN on IPv4 and only routed the DNS traffic over the VPN. My home network ist connected to that ...
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Does ss5 proxy server support IPv6?

Doesn't seem to work. My server have IPv6 activated and working. curl -6 directly also works, but not with the proxy. I have check the log and the error is "no IPv6 support"
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Why isn't my NAS advertising its IPv6 addresses?

Before my old router died, my NAS could accept incoming connections for any of its global (self-assigned) IPv6 addresses. After switching to my ISP's modem/router, incoming IPv6 connections no longer ...
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IPv6 simple home LAN server confiiguration

How do we configure a IPv6 host for access through its global IPv6 address? If that's what we do.This is a server running services for a small home LAN that I want to access when I'm away. I have ...
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Wireguard IPv6 connectivity not working

I have set up a Wireguard server on a VM running on top of Ubuntu and a couple of clients. I have also installed Pi-Hole on the same VM and I am using the public IP address for DNS resolving ...
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NFS IPv6 - configure server,client,firewalls, update

I'm having trouble configuring NFS server and client for IPv6. There is no problem using IPv4 in this but with IPv6 no such luck. My current try is this: server:/etc/exports /export/hat 2001:.../...
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ipv6 in qmi cellular proto openwrt

i want get ipv6 in qmi cellular protocol in openwrt my gsm modem is EC-25 and i check this that gsm modem show my isp ipv6 but qmi proto not set this ip for wwan0 how i can config this proto for ...
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How does one publish default router preferences using OpenBSD 6.5's rad daemon?

How does one publish default router preferences as defined in RFC 4191 using rad in OpenBSD 6.5? I've read the friendly manual and scanned the source with no success.
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nfs export to ipv6 client

My NFS exports are accessible via IPv4 to a number of hosts on my LAN. I want to make these exports available via IPv6 so that I can mount them to my laptop when I'm away. When I'm away I can access ...
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Testing external access via IPv6

I want to access some services running on one of my home LAN hosts. I have forwarded through my router but since my router does not support loopback I have to re-configure access when I am away and ...
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Enabling DHCP for IPv6 in netplan with networkd doesn't seem to do anything

I'm currently configuring the network interfaces for a Ubuntu 18.04 server, using netplan with the networkd backend. My hosting provider provides me with an IPv4 and an IPv6 for this server, however ...
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Adding Options To IPv6 SLAAC RA-learned default routes that survive RA-updates

I use IPv6 SLAAC to distribute routing information in my network. The default route has a lifetime of 1800s and is getting regular updates through the router. However, if I modify the default route, ...
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IPv6-subnets with systemd-networkd

My new ISP gives me a public IPv6 address with a /56 prefix to play around: 2001:b:c:d:5:6:7:8/56 I would like to create two subnets divided by a linux server like this: internet - fritzbox - ...
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Enabling rp_filter loose (#2) mode for IPv6

does anyone have a solution to make reverse path filtering work (in loose mode) also for IPv6 and not only for IPv4? The setup I am having is a machine1 connected directly to a machine2, while ...
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Cannot assign additional IPv6 addresses to Debian Jessie server

I've got a /64 IPv6 subnet and I'd like to use additional v6 addresses now. => /etc/network/interfaces: iface ens18 inet6 static address asdf:asdf:asdf:asdf::1 netmask 64 gateway fe80::1 ...
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ping6: 'Name or service not known' when using %iface notation

From man ping: -I interface interface is either an address, or an interface name. If interface is an address, it sets source address to specified interface address. If interface in an interface ...
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Why Firefox 60.0.2 (64bit) is much faster when I turn off IPv6 inside of it?

Pages as Facebook and Youtube in Firefox became much faster after I have set true network.dns.disableIPv6 in about:config. Why? Speed became very similar as in case of Google Chrome was originally ...
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ipv6 router push routes

in my lab i am in need of an IPv6 router that will play the role of the ISP. That ISP router will not be connected to the outside world and it is only to simulate a few things. That ISP router will ...