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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258 views

How to enable IPv6 Autoconfiguration with static address in Linux (RHEL)

I have a static IPv6 address I would like to assign. When I add the address to the /etc/sysconfig/network-scripts/ifcfg-eth0 file and restart networking I realize I get several IPv6 addresses. The ...
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1answer
92 views

Automatically acquire IPV6 address in CentOS 6

The network has fixed IPv4 address, and automatic acquired IPv6 address. Does anyone have an idea how to setup? Thanks a lot! I didn't use NetworkManager. The following is my setting, but it does not ...
4
votes
3answers
155 views

OpenBSD default gateway outside subnet

My ISP offers IPv6 by default. However, my ISPs IPv6 setup appears to be a bit strange because the default IPv6 gateway is located outside of my servers subnet. Under linux it is possible to setup a ...
14
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3answers
814 views

MySQL Error: (2003, “Can't connect to MySQL server on '2001:db8:81:2c::2' (-9)”)

I'm trying to set up Zenoss 4.2.0 on CentOS 6.3 to monitor a remote MySQL 5.5.25a server via IPv6. The firewall is open for the monitoring server and I can connect fine from the command line: ...
0
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1answer
26 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 ...
4
votes
2answers
254 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?
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0answers
13 views

CISCO SWITCH AND TELNET — 2 [on hold]

I need to configure my cisco881 as below after i write "ip address 192.165.1.1 255.255.0.0" the telnet session is disconnected i have ping to 192.165.1.1 but can't access via telnet what should i do ...
4
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0answers
36 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
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1answer
22 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 ...
2
votes
2answers
115 views

DHCPv6: passing delegated prefix to local RA

I currently have an Airport Extreme as my home office firewall. In addition to handling IPv4 NAT, my ISP (Comcast) delegates an IPv6 prefix to the Airport, which in turn assigns the delegated prefix ...
0
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2answers
45 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 ...
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1answer
262 views

Adding a whole IPv6 /64 block to an network interface on debian

I tried adding a whole IPv6 (/64) block to an interface using ip route add local 2001:41d0:2:ad64::/64 dev lo like described here on my Debian server, but I seem to be missing something. If I ping ...
12
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2answers
192 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
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1answer
24 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 ...
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2answers
44 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
80 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
1answer
33 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 ...
0
votes
1answer
36 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 ...
1
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2answers
232 views

When does Postfix use IPv6 and when IPv4?

I've configured my mail server for IPv6 and IPv4 but in the most cases it uses IPv4 while IPv6 is available on the remote host. I use Postfix in version 2.9. So my thought was that postfix uses IPv6 ...
2
votes
1answer
139 views

How to assign multiple IPv6 addresses with DHCPv6 to a single interface?

This seems to be possible based on the spec rfc 3315 page 23: Excerpt: The configuration information in an IA consists of one or more IPv6 addresses along with the times T1 and T2 for the IA. See ...
0
votes
1answer
24 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
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1answer
26 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
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0answers
41 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
0answers
33 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
148 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
1answer
788 views

Teredo - how to connect to host behind NAT?

All I want to achieve is to establish connection to my simple server (written in C# using TcpListener class, if it makes any difference), on my computer which is behind NAT. It has some IPv6 address ...
0
votes
2answers
41 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
56 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 ...
2
votes
2answers
394 views

Linux does not get IPv6 default gateway from Cisco ASA5510 on autoconf

My ASA 5510 has the following configuration for an interface. My Ubuntu box (2.6.35) connected to this network will correctly autoconf an IPv6 address, but it will not set a default route. interface ...
1
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2answers
557 views

Serving Meteor on main domain and Apache on subdomain independently

I'm running a Meteor server on my Ubuntu server. But problems arise when I try to have Apache serving a subdomain on the same server. main.domain.com -> Meteor sub.domain.com -> Apache Meteor is ...
10
votes
2answers
4k views

Should I use IPv6 only or both IPv4 and IPv6 in my web server?

My web server (Ubuntu, Nginx) have both IPv4 and IPv6 addresses assigned by the host. For my website, shall I bind it to only an IPv6 address? Is it the standard recommended way? Or, shall I use both ...
1
vote
1answer
661 views

Sendmail issue with IPv6

I have an email server configured with multiple-instance of sendmail running each on different IPv4 and IPv6 addresses. Everything is running smooth until a point where for some domains/emails ...
0
votes
1answer
224 views

Inject packet to a different NFQUEUE

I have an NFQUEUE, for IPv6 packets hooked to PREROUTING chain of mangle table in ip6tables. Once I receive a packet in user application, I modified the header. Infact, modified the header from IPv6 ...
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votes
2answers
1k views

Disable NSS LDAP IPv6 (AAAA) lookups

Question: How can I disable inet6 AAAA queries for my LDAP server during (LDAP-backed) NSS lookups on a CentOS (RHEL) 5 machine? Background: I've servers configured to consult ldap://ldap.internal ...
0
votes
0answers
40 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 ...
3
votes
0answers
39 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 ...
1
vote
1answer
136 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
124 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
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2answers
1k views

IPv6 on Server 2008R2 kills DNS resolution? Internet slowdowns?

I have been having intermittent Internet slowness for some time. It has been really challenging to me, and I have tried so many things. I replaced the modem, tried 3 routers, replaced a smart switch ...
2
votes
4answers
31k views

Ping returns an IPv6 address

I have 3 servers, a DC an exchange server and an apps server. If I ping the DC from any server or ping any server from the DC I get an IPv4 response, as you would expect, however if I ping exchange ...
1
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0answers
29 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
122 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
72 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?
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2answers
3k views

how to enable ipv6 in redhat

hi i have installed snort with ipv6 supprt Version 2.9.0.2 IPv6 (Build 92) in RHEL. can anyone tell me how to enable ipv6 support in linux i tried sysctl -w net.ipv6.conf.all.forwarding=1 and ...
1
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1answer
163 views

Native IPv6: routing between eth0 and eth1

I humbly ask for your assistance with the problem I can't resolve myself. I have a native IPv6 link with 2001:db8:14::/48 assigned. I'm running Slackware on 3.2.50-grsec kernel. My ISP's side (my ...
3
votes
2answers
140 views

How to set up a 6in4 / 6to4 tunnel server on a Linux gateway?

I have native IPv6 connection (/64 prefix), and I've been trying to set up IPv6 connection behind a OpenWrt router. But I discovered that I was unable to use ebtables to pass through all IPv6 traffic ...
0
votes
3answers
160 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
75 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. ...
1
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1answer
178 views

IPv6 autoconfiguration with multiple interfaces

From i.e. the man pages of FreeBSD it appears that IPv6 stateless autoconfiguration for assigning globally routable addresses won't work on hosts with multiple interfaces. Is that a general ...
0
votes
1answer
124 views

brctl addbr and bonding not working for CentOS6 if IPv6 is disabled

I set up a CentOS6-XEN4-Server according to these instructions. Now I want to set up bridges - first manually: brctl addbr test - but this fails with: "add Bridge failed: Package not installed" ...