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.

112 questions with no upvoted or accepted answers
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votes
1answer
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curl request to IPv6 localhost gets stuck

A docker container of mine exposes a HTTP interface on port 8500, which is mapped to host port 8500. It is not IPv6 enabled. This still means, I should be able to access it at localhost:8500. IPv6 ...
5
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133 views

Why does localhost resolve to ::1 but not 127.0.0.1

With getent hosts localhost, I only get ::1, although I expect 127.0.0.1. I have IPv6 disabled, so getting ::1 is even more surprising. To add to the confusion, when I ping localhost, pings are sent ...
5
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0answers
151 views

Multicast ICMPv6 comes back with conntrack state invalid

I was playing arround with the Multicast feature of IPv6. $ ping ff02::2%wlp3s0 This should normally result in an echo-reply from all the routers on your local network segment (Wikipedia - IPv6). So ...
5
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0answers
2k views

dhcp ipv6 dynamic prefix delegation

I'm trying to setup Linux-based home gateway with IPv6 support. IPv4 configuration is finished and I'm using IPv4 NAT, ISC DHCP for addresses allocation, PowerDNS for local DNS setup, PDNS recursor to ...
4
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2answers
846 views

How to add static ipv6 route with systemd-networkd

I'm trying to achieve the equivalent of the ip command below via networkd without success. ip route add default via fe80::1 dev eth0 My networkd configuration looks like below and brings up the ...
4
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0answers
694 views

socat gives error (read(6, 0xf97acc0, 8192): Permission denied)

I'm trying to use socat as a port mapper to map IPv4 connections to my OpenVPN server running behind a DS-Lite IPv6 cable connection. //edit I tried with a non root user and root. But I get the same ...
4
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0answers
731 views

Make ping show hostnames instead of IPv6 addresses

When I use the command ping ff02::1%eth0 to get a response from all IPv6 hosts in the network segment, I get responses from a bunch of link-local (fe80::) addresses (LLIPs). In order to figure out ...
3
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0answers
220 views

RFC4821 Path MTU discovery for IPv6 on Linux

I have configured an IPv6-over-IPv4 tunnel via Hurricane Electric on my Linux machine. While I can ping ipv6.google.com: bash-4.4# ping ipv6.google.com PING ipv6.google.com(lhr48s09-in-x0e.1e100.net (...
3
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1answer
475 views

IPv6 routing Public to a subnetwork

Doing Linux/Debian IPV6 Routing from my vendor to a client not working. IPV4 NAT/routing is reliably working using iptables and dnsmasq, however, even with forwarding enabled on IPv6 I can't make it ...
3
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0answers
181 views

using IPv6 Multicast to push a file

I would like to push a file over the network once to reach multiple linux hosts over IPv6 using multicast. (I think, that's the best way) How can I get my file pushed over IPv6 to multiple systems? I ...
3
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1answer
942 views

NetworkManager corrupted ipv6 dns settings

Today, I started having most web sites failing to load in browsers. Checking my network settings, I discovered those strange settings in ipv6 tab: Switching back to my usual dns for ipv6 (Google's ...
3
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0answers
1k views

IPv6, dnsmasq dhcp-range

I'm trying to assign IPv6 addresses to my LAN clients with dnsmasq 2.62 on Debian Wheezy: enable-ra dhcp-range=interface:br0,fde4:709f:bee2:a87b::,fde4:709f:bee2:a87b::ff,ra-stateless The ...
3
votes
1answer
504 views

Network interfaces up order, ipv6 tunnel problem

I have a ipv6 tunnel interface, that is using my network connection on eth0. when I turn on my system something messes up the things and I have no ipv6 connectivity. The system is Ubuntu 14.04 server ...
3
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0answers
109 views

Linux Routing Question

I was wondering how it would be possible to have multiple IPv6 default gateways on CentOS linux. I currently have two interfaces with IPv6 (venet0 and tb0), both with different blocks routed to them. ...
3
votes
1answer
393 views

Prevent Fedora OS from violating my privacy with static EUI-64 ipv6 address

# cat /etc/redhat-release Fedora release 26 (Twenty Six) # ip token set ::DEAD:BABE:BEEF:CAFE/64 dev devName # vi /etc/sysconfig/network-scripts/ifcfg-devName IPV6_PRIVACY=yes [or] IPV6_PRIVACY=...
2
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0answers
43 views

How to avoid extra routes from Network Manager?

On my home wireless network, network-manager adds extra routes compared to wpa_supplicant, which causes IPv6 hosts on the local network to be unreachable. Route table is shown below, note that network-...
2
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0answers
681 views

ntp using ipv6 address instead of ipv4

I have a laptop running a version of Linux ( 3.12 ). I have ntpd installed and configured to sync with time.google.com. The problem I am having is if I am plugged into a network that only provides ...
2
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0answers
171 views

Why IPv6 connectivity on OpenVPN network failed after short time?

I use OpenVPN TUN network. IPv4 works fine. But I have added support for IPv6. I have a problem with IPv6 connections. IPv6 works fine only for short time. When I ping tun0 IPv6 address on my VPN ...
2
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0answers
78 views

6PE (RFC 4798) support on ubuntu

I notice that in the newer kernels, support for RFC 4798 has been added through the means of IPV4 mapped addresses. I do have a route pointing to the mapped address being the nexthop and I'm unable to ...
2
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0answers
836 views

Ubuntu pinging from link-local address instead of global

I have a network like this, (client 2001:10:1:100:0/64) -> router -> (server 2001:172:16:200:0/64) However, when I ping from client to the 172.16.200.0 network, (or anywhere) it always uses the link ...
2
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1answer
821 views

ping6: sendmsg: No buffer space available

I'm not sure what changed, as I had this working earlier before having to restore one of my disks using zfs receive from a zfs send -R. I don't know if that's relevant but that's the only thing I can ...
2
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0answers
164 views

FreeBSD 11.0: IPv6 connectivity lost after some time

Since a few weeks I'm having a problem with the IPv6 connectivity of my FreeBSD 11.0 server. There had been no software updates or configuration changes that I know of that could cause the problem. ...
2
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0answers
3k views

vsftpd works with ipv6 but not with ipv4

I am running an ftp server via vstfpd. /etc/vsftpd.conf: listen=YES #listen_ipv6=YES anonymous_enable=NO local_enable=YES write_enable=YES use_localtime=YES xferlog_enable=YES #...
2
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0answers
598 views

How to make Linux stop sending IPv6 ICMP redirects?

In case of IPv4 we have net.ipv4.conf.all.send_redirects flag, but it's not available for IPv6. Is there anything better than this? ip6tables -A OUTPUT -p icmpv6 --icmpv6-type redirect -j DROP For ...
2
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0answers
65 views

ip6tables rule to allow unrecognized next-header

I have a compliance test that is requiring me to respond to unrecognized next-headers per RFC 2460. I am running a debian 3.16 kernel. My current firewall implementation is dropping these frames per ...
2
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0answers
312 views

Is there an alternative for net.ipv6.ip_nonlocal_bind on FreeBSD?

On Linux (Kernel >= 4.3) I can "claim" an entire IPv6 subnet by routing it to localhost (sf#403648), and then by setting net.ipv6.ip_nonlocal_bind=1 so that I can bind on any of these addresses. I ...
2
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0answers
1k views

create a specific route with systemd-networkd

I am trying for days to setup a specific route with systemd-networkd. And it all fails. [Match] Name=en* [Network] DHCP=yes IPv6PrivacyExtensions=kernel IPv6AcceptRA=true [Route] Destination=2001:...
2
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0answers
802 views

OpenVPN with /112 IPv6 subnet, unable to route to eth0 and vice-versa

I'm trying to set up an IPv6-enabled OpenVPN server. The provider only gave me a /64 subnet : 2a06:1700:1::640/64. Here is the OpenVPN configuration : port 1194 proto udp dev tun0 server-ipv6 2a06:...
2
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0answers
119 views

ipv6 rule priority duplication

When I add ipv4 policy rules using ip rule add the resultant rules get added to the end of the policy table with decrementing priority from 32767 eg: # ip rule add lookup 8 # ip rule add lookup 9 0:...
2
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0answers
4k views

How to avoid curl trying IPv6 name resolution

From a docker container when I try to curl 'another container name', curl first tries to resolve the name to IPv6. This causes few seconds delay because the web server is not reachable over ipv6. I ...
2
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0answers
754 views

Manually configure Link-Local IPV6 regardless of ISP

The long and short of it is we have a system with a single ethernet port and we need to provide both an IPV4 connection (that can be completely incontrol of the user and varies per system) and we want ...
2
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0answers
892 views

why i can see ipv6 socket with ipv6 stack disable?

I try to disable complety ipv6 on a Linux Debian 7 (wheezy) However , things escape me. In my case, i test with grafana process (I have same issue with munin, rpcbind etc) Method 1 : with sysctl ...
2
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0answers
567 views

How to make OpenWrt router advertise itself as IPv6 default gateway?

I have an OpenWrt Barrier Breaker router which is configured with a /48 ULA prefix. Connected Windows clients have two established routes to this space: /64 On-Link and /48 via link-local address. ...
2
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0answers
862 views

OpenWrt wifi bridge with IPv6

I am running OpenWrt 15.05 on my WDR4300. My ISP is via cable with legacy-IPv4-only. For IPv6 connectivity I use HE.net tunnel to receive a static IPv6 /64 subnet. My office is in a different room ...
2
votes
1answer
754 views

Centos 7 - Can't download RPM (Trying to connect with IPV6)

I am normally an Debian/Ubuntu guy, but I wanted to test the foreman on CentOS 7, but I am having some trouble with the rpm command. I have tried to disable IPV6 with echo 1 > /proc/sys/net/ipv6/...
2
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0answers
3k views

Force IPv4 over IPv6 only for certain addresses

I'm currently running Debian 8 and I'm trying to force applications like Google Chrome to use IPv4 over IPv6 only for certain sites. My ISP natively offers IPv6 and it's amazing on all websites that ...
2
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0answers
1k views

Why does /proc/net/if_inet6 not contain all IP addresses from 'ip addr'?

Since recently, after moving from Ubuntu 10.04 to 14.04 (kernel 2.6.x to 3.13), I noticed a strange thing about IPv6 addresses. I assign several IPv6 addresses to my eth0 interface to allow the Apache ...
2
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0answers
522 views

DD-WRT: dhcp6c not fetching new address for ppp0

I'm currently trying to configure my DD-WRT-based router to do IPv6. Now I'm at a point where it works fine - until the line is disconnected and reconnects (which happens at least every 24h... for a ...
2
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0answers
1k views

Native IPv6 router on FreeBSD

I need your help to configure native IPv6 router on FreeBSD. Interfaces configured well, on both I can see two addresses (real and link local). I can ping ipv6.google.com and when do lynx www.kame....
2
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0answers
2k views

Linux bridge blocks UDP packet from tap interfaces

Introduction: I'm working on a 6lowPAN projects of Wireless Sensor Networks. Basically, I have a set of nodes (Contiki OS) which are running on a linux host. Each nodes have its own tap interface ...
2
votes
1answer
466 views

IPv4 goes offline several times per hour on headless remote server, IPv6 unaffected

On my Ubuntu 14.04.2 server IPv4 goes offline several times per hour (one to four times I've seen, but at no particular minute per hour or so). My hoster insists that the problem is on the server-...
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0answers
36 views

Debian ignores static IPv6 configuration

Original post I'm trying to configure a static IPv6 address for my Debian container (running on LXD) but the system keeps ignoring my configuration. Currently my /etc/network/interfaces looks like ...
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0answers
73 views

IPv6: Why ping to another IPv6 host doesn't work when loopback interface is DOWN

While it is said the only job of lo interface is to test its own connectivity, why doesn't pinging another IPv6 host work when the lo interface is made DOWN. Network configuration: host1(eth0) - ...
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0answers
60 views

IPv6 Neighbour Table Overflow: Stop Router from caching multicast addresses

TL;DR: How do I prevent IPv6 neighbour solicitations from creating multicast entries in the neighbour cache? I recently installed the somewhat obscure Padavan RT-N56U firmware (Linux 3.4.110) on my ...
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0answers
325 views

How does avahi enable mDNS and expose it via LAN with ipv6 compared to Apple's mDNSResponder?

I'm using a device with Linux 4.9 and systemd-networkd. With ipv4 everything is ok, so I want to talk only of ipv6. In fact, I completely disabled ipv4 to use ipv6 with DHCP. So this is my initial ...
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0answers
89 views

multiple ipv6 from range on one machine

I have a debian server and a pool of ipv6 addresses with 64 mask. I want to split all ips between multiple servers, but configure it through masks, without adding 4 million ips to /etc/network/...
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0answers
48 views

Ubuntu 14.04.5 LTS sends an IPv6 NS message for link-local address for no obvious reason

After sending an ICMPv6 echo request message to random global address, my router sends my PC a Neighbor Solicitation message in order to make an association between its link local IPv6 address and a ...
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0answers
205 views

Any way to advertise preferred IPv6 address with rtadvd

I have both native and HE-tunnel IPv6 addresses on my router (FreeBSD 10.3-RELEASE-p20). Hurricane electric prefix is static, native prefix is not guaranteed to be static, it is obtained by prefix ...
1
vote
1answer
497 views

How to check whether kernel received MLD query or not?

On the Internet I found this command netstat -p icmp6 -s which can dump how many MLD queries received by the kernel. But I have Busybox for my system and because of this I'm unable to run netstat ...
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0answers
546 views

How to set up ipv6 home routing?

I've got a IPv4 only ISP and get a public IPv4 address from them. On my router, a Linux machine, I've setup a 6in4 tunnel using a tunnel provider. So I now have a tunnel interface (point-to-point) ...