IPv6 is the successor to IPv4. Rather than 2^32 addresses (like IPv4), it has 2^128, which is 340,282,366,920,938,463,463,374,607,431,768,211,456 unique addresses (34 undecillion). IPv6 addressing is quite different to IPv4 and is not backwards compatible, but protocols that sit on top (HTTP, SSH, ...

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1answer
13 views

OpenBSD ISC-DHCP IPv6 not working?

How to enable dhcp for ipv6 in OpenBSD 5.5. Default dhcpd don't know about IPv6, it says that option -6 is incorrect and do not understand ipv6 config. But it has version 4.X that IPv6 must be enabled ...
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votes
0answers
14 views

TCPv6: Possible SYN flooding on port … . Dropping request - how to change limit?

TCPv6: Possible SYN flooding on port ... . Dropping request My server is dropping legit connections. It is not a publicly reachable server and it supposed to handle a LOT of ipv6 connection from my ...
2
votes
1answer
55 views

ipv6 and ipv4 server preference

A webserver I manage is running Ubuntu 14.04 and is configured for dual stack - ipv6 & ipv4. It is my understanding that ipv6 connections have first priority after which it should fall back to ...
3
votes
1answer
21 views

On IPv6 linux router, autoconf and accept router advertisements for single interface

Apparently right now if you have /proc/sys/net/ipv6/conf/all/forwarding set to a value of 1 that completely disables the auto configuration of Interfaces and routes, but I have a system with one ...
0
votes
0answers
31 views

Setting up IPv6 on Apache2

Currently I have the "ports.conf" with the following content: NameVirtualHost *:80 Listen 80 <IfModule mod_ssl.c> Listen 443 NameVirtualHost *:443 </IfModule> <IfModule ...
2
votes
0answers
30 views

Why “scope link” ipv6 address can be pinged via interfaces which they are not active on

[root@2_01 ~]# /sbin/ip -6 addr show pubeth0 inet6 2001:1::6/64 scope global inet6 2001:1::1/64 scope global inet6 fe80::20c:29ff:fe69:f9e8/64 scope link [root@v2_01 ~]# /sbin/ip -6 addr show ...
0
votes
3answers
54 views

is it possible in this case to get two IPv6 networks to communicate over the IPv4 Internet?

I have a setup of a laptop connected to a cellular IPv4 network (3G usb dongle) and PC connected to another IPv4/IPv6 network. Both have been configured to run as IPv6 routers and each has its IPv6 ...
0
votes
0answers
14 views

IPv6 host route is deleted after PMTU expires

I am experimenting my new IPv6 tunnel setup between my local Ubuntu box and a scratch Linode. I set up some docker containers, configured 6in4 tunnel server and IPv6 forwarding on the Linode: # uname ...
0
votes
1answer
26 views

ipv6 : why ndp resolves to global scope address?

I'm facing a strange ipv6 behavior and I don't know how to solve it because I'm not familiar with ipv6. Maybe this behavior is normal. I hope that you will help me. ( I'm running under debian 6.0.9 ...
0
votes
2answers
50 views

How many IPv6 addresses can one network card have assigned to it, and what is the benefit?

This is not my area of expertise, so forgive me if I am getting this completely wrong. Some datacentres are now offering IPv6 addresses and potentially 100s per VM. What would the benefit of this be? ...
1
vote
1answer
64 views

Single ipv6 from /64 subnet [closed]

I have a newbie question I'd like to ask. We have a dedicated server and we got an IPv6 /64 block. We want to use squid to make proxy and use those IP. And my question now is: is it possible to use ...
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votes
0answers
47 views

Nginx multiple IPv6 ssl

I'm running several websites with Nginx 1.6.1. Now I want to make them accessible over IPv6. Normal HTTP is working but with ssl I have problems. Site1 server { listen xxx.xxx.xxx.1:80; ...
2
votes
1answer
53 views

curl and wget attempting an ipv6 connection

On my dedicated server (hosted by OVH), that is running a fresh install of Ubuntu 14.04, curl and wget take approximately 10 seconds to complete a simple request. $ curl -v google.com * Rebuilt URL ...
2
votes
0answers
66 views
+50

Exchange 2007 not delivering to primary MX of one domain

I'm trying to send email to a domain that has two MX records. The higher priority record is IPv4 and the 2nd is IPv6. Exchange gives me a delivery is delayed message in my inbox after I've tried to ...
0
votes
0answers
100 views

No IPv6 traffic in bridge mode

Hello happy people o/~ yesterday I had the audacity to reboot a remote Linux server. This Ubuntu 64, 12.04 installation went from kernel 3.11.0-19-generic to 3.13.0-32-generic and also from being ...
1
vote
0answers
44 views

How do I get IPv6 packets to my KVM virtual machine?

My setup is: Debian Wheezy x64 on the host and on the guest. I am using a tun/tap setup to connect a virtual machine to the host. The KVM network options I use are: -net ...
0
votes
0answers
7 views

Virtualbox running Ubuntu and ipv6 [migrated]

I'm just playing around with ipv6 and I was trying to use netcat over ipv6. I tried the following and it works. $ # terminal one $ nc -6 -l 7171 $ # terminal two $ nc -vvv -6 ::1 7171 ...
3
votes
1answer
49 views

What interaction is required for a Windows server and Cisco router to setup and destroy a Multicast session?

I'm trying to understand how Multicast actually works, and have read numerous articles and Wiki pages, and have gathered this: A multicast address takes up state on the router of the membership, ...
3
votes
2answers
349 views

When do browsers request and use IPv6 DNS records?

I'm glad my new Linode hosted server offers an IPv4 and an IPv6 address as well. And default DNS records, when using Linode as NS, shows both A and AAAA records example.com 86400 IN A 203.0.113.4 ...
0
votes
3answers
76 views

How does anycast work with tcp?

TCP, being stateful, should require subsequent packets to reach the same server. (Stateless) HTTP runs on top of TCP, and CDN's can use anycast. So how does TCP work with anycast? What if the syn ...
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votes
1answer
43 views

What is the safe as AAAA record [closed]

What is safe for AAAA record. Short or full format? I set this e.g.: 4a01:20:18:0:5:8:8:30 This is IP from mail server. But when smtp sending email out i see problems in logs. Gmail return email as ...
0
votes
1answer
82 views

Rule accepting input HTTP in ip6tables not enough to allow IPv6 requests

I am facing an IPv6 accessibility problem with my server. The server is IPv6-capable and is capable of contacting/being contacted by third-parties on IPv6 (ping6 and traceroute6 tested on my Debian ...
0
votes
2answers
77 views

IPv6: “Destination unreachable: No route” Routing error?

I've got an IPv6 address added to a bridge (sysctl has been configured to enable forwarding). However whenever I try to ping an IPv6 host it fails with the following error: PING ...
4
votes
2answers
269 views

For IPv6 migration, should we replace existing L2 switches running VLANs?

My L3 Core switch, Nortel ERS 8600, is IPv6 compatible. However, during migration to IPv6, do we need to also check the compatibility of edge/distribution switches in a VLAN-based campus network?
0
votes
1answer
57 views

Clients losing stateless ipv6 addresses

I'm having problems with Linux VM's at a certain VPS hoster. Periodically the hosts lose their ipv6 address. They go to 'deprecated' and then disappear completely. On the client side I have checked ...
3
votes
0answers
72 views

Different 'ping6' reverse lookup behavior using ipv4 vs ipv6 dns servers in /etc/resolv.conf

I'm hoping someone could help shed some light on the different behavior ping6 is demonstrating on a GNU/Linux box. The machine is a Linode host which has been assigned both an IPv4 and IPv6 address. ...
0
votes
1answer
43 views

Ubuntu 12.04 services using ipv6

I currently manage two servers on Linode. The first "server-a" is running 12.04, the second "server-b" is a fresh install of 14.04. A while ago I had some trouble with spf records on server-a and ...
0
votes
1answer
42 views

Dual-Stack Lite and FTP connection via IPv4 - How?

my original question: FTP client/server failing on switching to PASV mode Based on that, I would like to know if/how I can open a FTP connection from a computer that is inside a ISP's network that ...
0
votes
2answers
126 views

iptables for ipv6 address port forwarding to localhost port

Say I want to redirect 2a00:1450:400c:c01::71 on Port 443 to localhost Port 12345. How to do that with Iptables? Update Okey, it's Weechat which running an SSL relay on a port >=1000. It can make ...
0
votes
1answer
61 views

Configure IPv6 on FreeBSD webserver

Seems I just can't nail the right rc.conf configuration for IPv6 on my FreeBSD 10 VPS. I'd like to go completely IPv6 and tutorials/instructions i followed aren't really working for me somehow. It's ...
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votes
2answers
69 views

possible to make Apache listen to ip range? [duplicate]

Is it possible to make apache webserver listen to a ip range? for example using: listen 192.168.0.*:80 or listen 192.168.0.1/5:80 (these examples are for IPv4 but i need it for IPv6 ...
0
votes
1answer
59 views

Ubuntu IPv6 port redirect using ufw

I'm trying to configure port redirection from port 80 to 8080 on server with both IPv4 and IPv6 support. The OS is Ubuntu 14.04 with the 3.2* series kernel. It is a production server, so I don't want ...
12
votes
2answers
209 views

How should I temporarily disable IPv6 for an entire network?

We have a medium sized network with IPv4 and IPv6 across it, and our upstream provider is making IPv6 go away for two weeks while they do... something. (It's "experimental" and we don't pay for it, ...
0
votes
1answer
27 views

Odd multicast messages during IPv6 autoconfiguration

So I am trying a little autoconfiguration on some virtual machines while observing what happens in wireshark and trying to understand what how it works, step by step. This is how any of those ...
1
vote
1answer
45 views

hostname command returns nothing on ipv6 host

I have an RHEL host that is dual stacked for ipv4 and ipv6. Ipv6 is the primary, including all DNS records for the host. Ipv4 is a fall back to reach ipv4 only networks, its even behind an ipv4 NAT. ...
0
votes
0answers
52 views

IPv6 connection dropping on Debian 7

EDIT: I've tried something different based on searching around. This is now my /etc/network/interfaces: # This file describes the network interfaces available on your system # and how to activate ...
0
votes
1answer
203 views

Tomcat & Java not listening on IPv6

We've got a webserver running Ubuntu 12.04 LTS, Tomcat 7 and Oracle Java. So far, we have been serving a web app on IPv4 address on ports 80 and 443 (80 redirects to 443). I'm trying to make the ...
0
votes
0answers
55 views

vServer: Configuring single (/128) assigned IPv6 addresses for use as IP address pool for IPSEC (Strongswan) road warriors

I've a new (dev) vServer up and running. Unfortunately the provider only hands out single IPv6 addresses (not even /64 subnets). Now I am a bit confused how to achieve the following: I want to use ...
2
votes
1answer
178 views

How do I set up an IPv6 DMZ with iptables without a static allocation?

I have several networks which are on Comcast's residential network. I need to access those networks from a variety of environments, via an SSH proxy on one of the hosts. (As it happens I'm using ...
0
votes
2answers
56 views

How to I forward requests on a IPv6 port to a IPv4 host behind NAT?

I run a Xen Dom0 with 2 VMs NATted (other VMs are bridged, and are ok). This Dom0 has an IPv6 and IPv4 address. Requests to, for example port 25 are forwarded to a LAN address that one of the VMs ...
0
votes
0answers
163 views

FreeBSD 10 IPFW IPv6

I'm struggling to allow IPv6 connections on my FreeBSD 10 server. I have a working IPv6 connection. But IPFW blocks all the IPv6 traffic. #!/bin/sh # # flush existing rules ipfw -q flush # allow ...
3
votes
1answer
65 views

Is net.ipv4.vs.timeout_timewait used also for IPv6?

Does this setting for TCP net.ipv4.vs.timeout_timewait apply only to TCP connections established over IPv4 or does it also apply to TCP connections established over IPv6? I have found this for ...
0
votes
0answers
74 views

IPV6 not acquired from ipv6 address pool in ubuntu 12.04 for ISC server

Ubuntu 14.04 running in ISC-dhcp-client is not acquiring IPV6 from the pool given in server. Below is vim /etc/dhcp/dhcpd6.conf file default-lease-time 600; max-lease-time 7200; subnet6 ...
1
vote
1answer
153 views

How do I access a machine on an IPv6 address?

We have a CentOS installation, The machine has the IPv6 Address fe80::fc54:ff:fea1:563/64. What address should I specify within my Windows machine so I am able to access the CentOS machine? We are ...
0
votes
1answer
279 views

Mangling traffic from a Mikrotik Router

I have a MikroTik powered Router in the house with a couple of internet connections (2 200/10Mb Cable modems and a 100/20Mb VDSL Line). I am using Mangle rules to set routing marks and NAT rules to do ...
1
vote
0answers
57 views

Red Hat 6.5- sysctl -w net.ipv6.conf.default.accept_redirects=0

I am in the process of writing a Red Hat 6.5 Kickstart disc with hardened security. I have run a program to determine where the weaknesses are in my system, and apparently there is a medium severity ...
2
votes
3answers
191 views

Gmail is Unreachable from Google Compute Engine

I have been getting network is unreachable errors every time i try to use php to mail something out. alt2.gmail-smtp-in.l.google.com [2a00:1450:4010:c03::1a] Network is unreachable ...
2
votes
1answer
88 views

Can I use NAT64 to route public IPV6 traffic to internal IPV4?

I have a bunch of public IPv6 addresses and some services that run IPv4 only. Can I use NAT64 to connect these services? Is there another solution like a proxy or something?
0
votes
3answers
273 views

How do i reach IPv4 addresses from an IPv6-only network?

I would like to reach this address via an IPv6 address: http://downloads.openwrt.org/attitude_adjustment/12.09/ar71xx/generic/packages/ In our Freifunk routers there is no DNS available, so the name ...
2
votes
2answers
101 views

IPv6 servers and IPv4 client base

As IPv4 addresses are running out rapidly, a time will come when there will not be even single IPv4 address available for allocation. But, huge number of devices will still be running on IPv4. ...