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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Cant connect IPv6 linux server via Putty

Cant connect IPv6 linux server via Putty. Server IP should be like this: 2001:14c0:2:2f6f::6 But when i replace working IPv4 in my putty by this address, it dont connect returning: Unable to open ...
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2answers
601 views

Linux server not receiving default IPv6 route over PPP link

I'm replacing a pfSense router in a remote office with a small linux device, running Debian. The router only has to handle very basic iptables / DHCP and VPN facilities. It is configured so that the ...
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1answer
937 views

Cannot assign requested address

openssl req -new -x509 -days 8192 -newkey rsa:4096 -extensions v3_ca -config conf/caconfig.cnf -keyform PEM -keyout private/key.ca.pem -outform PEM -out certs/crt.ca.pem I'm using nginx in ...
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1answer
354 views

how to configure static ipv6 and additional ipv6 with same vlan?

I'm having trouble with configuration static ipv6 address and additonal ipv6 on same interface(eth4). static ipv6 configuraiton issue firstly, I configure below vi /etc/network/interfaces auto ...
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1answer
525 views

OpenSSH not connecting to IPv6 host unless 'AddressFamily inet6'

I have an OpenSSH client and server. Both are running on Debian 7 with OpenSSH 6.0. I have a VPN established between the two machines, and the VPN has functional IPv6. It does not have any IPv4. ...
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1answer
86 views

Enabling IPv6 Causes TIME_WAITs to Skyrocket

Last week, we enabled IPv6 on our Authoritative DNS Servers and the corresponding Glue Records on our registrar for our domain's name servers, and we added AAAA records for our own website. This ...
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1answer
288 views

Static IPv6 address in Windows unused for outgoing connections

I'm running a Windows server and trying to get it to use a static IPv6 address for outgoing connections to other IPv6 hosts (such as Gmail). I need this because Gmail requires a ptr record, and I ...
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2answers
2k 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 ...
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1answer
113 views

Why doesn't this IPv6 listen directive also accept IPv4?

In my nginx (1.4.2) setup on Ubuntu 12.04, I have set up only one configuration file (I deleted/disabled the others): server { listen [::]:80 default_server; location / { root ...
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1answer
184 views

ipv6 transparent proxy usage using apache benchmark(ab) apache2-utils-2.2.22

Would anybody please provide any hints on why the ab is failing work on ipv6 client/server configuration, while ipv4 is working good ? Thanks in advance == Client configuration: Apache benchmark ...
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1answer
836 views

Disabled IPV6 but still showing in netstat

newbie here, for security best practice I want to disable IPV6 (not to deal with IPV6 firewall settings). I use Hetzner root server Ubuntu 12.04 . /etc/sysctl.conf file already have a setting from ...
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1answer
1k views

Understanding DHCPv6 Stateful Solicit message

I have been reading the full RFC 3315 and trying to generated spoofed nodes to ask for IPv6 address. (only for practice) Right now, I have a Ubuntu with wide-dhcpv6-server (the DHCPv6 server), one ...
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1answer
87 views

SSH Recursive AAAA lookup

Given a server "example.com" at 10.0.0.1,[ipv6] with a CNAME *.example.com > example.com And a second server "staging.example.com" at 10.0.0.2/[ipv6] if staging tries to SSH to "example2.com" (with ...
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1answer
182 views

DHCP clients: Where is the hostname going to come from

We are building a private cloud here, VMs have at least 2 NICs, sometimes 3 or 4, each may be statically configured for IPv4 and/or IPv6 or be configured by DHCP or a combo of the two. Yes it's a ...
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1answer
645 views

/etc/init.d/iptables-persistent start returns fail but seems to work

I am trying to activate iptables-persistent on an Ubunutu server. Config files are located in /etc/iptables/rules.v4 /etc/iptables/rules.v6 I have installed the iptables-persistent package. ...
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0answers
195 views

Why does an IPv6 route added before virtual machine is started not work

I have an external server at Hetzner with Debian 7 and trying to setup KVM with IPv6 Routing (the same setup works for IPv4 without problems). I have one Ubuntu Server VM with two interfaces which ...
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2answers
198 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 ...
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0answers
364 views

Networking with lxc containers with local dhcp and external ipv6 double bridge problems

I want to use both ipv6 externally on all my containers, and ipv4 external only on the hosts. I am using Ubuntu 12.04 64bit. For ipv4 on the container I use the DHCP that came with the lxc ...
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1answer
822 views

How to do dual stack IPv4/IPv6 with virtual hosts on nginx 1.4

I'm using nginx 1.4.1 (now, before it was 1.2.1) and would like to support dual stack (IPv4 and IPv6). I'm always getting duplicate listen options for xyz errors from nginx. server { listen 80 ...
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1answer
79 views

How to control the originating IPv6 of emails sent by postfix?

In a VPS with 2 IPv4 and 16 IPv6, I send emails with postfix. Each time, the email is sent from one of the IPs randomly Received: from domain.com (a random IPv6 out of my 16 IPv6) Thus, SPF fails ...
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1answer
266 views

SPF: softfail (domain of transitioning email does not designate 2a01:4f8:121:2062::2 as permitted sender)

I am seeing this SPF softfail for emails sent from my server, and I notice that 2a01:4f8:121:2062::2 is an IPV6 address. When I check 2a01:4f8:121:2062::2 it is translated as 0.0.0.2 ipv4, so that ...
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1answer
1k views

Why is iptables rejecting the second and subsequent fragments of an allowed packet?

I have two hosts which are attempting to set up an IPSec connection with each other. For this they have to communicate on UDP ports 500 and 4500, so I opened them in the firewalls on both ends (shown ...
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3answers
341 views

ipv6 on Ubuntu server - how do I secure?

On our Ubuntu server, ipv4 & ipv6 are enabled. We have taken these steps so far. Enabled iptables & ip6tables Copied the rules exactly from our iptables to ip6tables Do we need to make ...
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1answer
210 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 ...
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1answer
105 views

Default to IPv6 Linux

I have IPv6 setup on Linux however it is not using IPv6 by default unless I specify it. For example: ssh -v HOSTNAME I see ssh connecting to the IPv4 address. The only way I can get it to use ...
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2answers
601 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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2answers
176 views

Connecting a VPS's static IPs to a mailserver on a dynamic LAN over an IPv6 OpenVPN connection?

Yes, I know. Ugh! I have a small office and we're trying to reduce our network expense. Because of client audit requirements, we run our own mail server, and would like to keep it that way. For ...
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1answer
2k views

Sending netmask and gateway/route with dhcp for ipv6

I have setup a DHCP server to assign ipv6 to my clients. However, both the "routers" and "subnet" OPTIONS are ignored. I have read that ipv6 does not get theese from the DHCP, rather from the router ...
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1answer
118 views

Changing ipv6 netmask and gateway on running interface

I am trying to change the netmask and gateway of a running ipv6 interface. On ipv4, I can simply do something like: ifconfig eth0 netmask 255.255.255.0 gateway 123.123.123.123 How would I do this ...
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1answer
226 views

Prefix Delegation and route creation

I'm using the ISC dhcp server version 4.1 for DHCPv6 prefix delegation on a network. When the server allocates a prefix to a client, the server does not create a route for that prefix to the client ...
3
votes
1answer
207 views

Is there a way to convert IPv6-style IPv4 addresses in X-Forwarded-For headers to IPv4-style?

I run a system that has a Pound reverse proxy in front of a squid accelerator, in turn in front of Apache2 powering a few PHP-based webapps. The Pound daemon is configured to send X-Forwarded-For ...
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0answers
163 views

How to have JunOS to learn IPv6 default route from RA?

All is in the title, I'd like to have a JunOS learning it's IPv6 default route (and eventually addresse) from the internet connected router making RA, like an end-user computer, is this possible ? I ...
3
votes
0answers
432 views

IPv6 default gateway route disappear after reboot

I'm using Debian Wheezy on a dedicated server which uses IPv4 and IPv6 at the same time. ifconfig eth0 eth0 Link encap:Ethernet HWaddr 11:11:11:11:11:11 inet adr:90.0.0.1 ...
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votes
1answer
417 views

Does Linux support IPv4 mapped IPv6 addresses?

I work in a mixed IPv4 / IPv6 environment. I read that IPv4 addresses can be mapped into the IPv6 space with this syntax ::ffff:1.2.3.4 (1.2.3.4 is the IPv4 address) Does Linux support this ...
2
votes
1answer
203 views

Ping and traceroute can resolve my IP, but real clients (Apache, Adium, ssh) cannot

I have set up my DNS with afraid.org. I have an A record ssh.strugee.net pointing towards 71.32.87.80. I do not have any AAAA records set up. When I run ping ssh.strugee.net or traceroute ...
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votes
2answers
568 views

Debian 7 how are IPv6 link local addresses set?

It seems like when dhclient runs on eth0 I get an IPv4 address from the DHCP server and a Scope:Link IPv6 address attached to eth0: inet6 addr: fe80::a00:27ff:fed0:4d41/64 Scope:Link But I can't ...
2
votes
1answer
127 views

IPv6: using a link mtu greater than the mtu of the default route

When configuring an IPv6 LAN it may be desirable to use router advertisements to announce a link MTU of either the standard 1500 bytes or something larger to enable usage of jumbo frames, perhaps ...
4
votes
2answers
169 views

ipv6 multiple addresses and firewall on remote machine

I have an ubuntu server (serverA) which has a couple of IPv6 addresses. One of these is based on it's MAC address, and is known to the network, the other one I presume ubuntu created as a 'private' ...
3
votes
2answers
1k views

snmpwalk to ipv6 address timeout

Snmpwalk is failing. I don't know why. I have a host configured with a global ipv6 address. Snmpd is listening on ipv6. netstat -l|grep snmp udp6 0 0 [::]:snmp [::]:* udp6 ...
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0answers
82 views

Is there any way to programmatically add prefixes to radvd without writing to radvd.conf and restarting it?

I need to create prefix entries on demand to configure a quite large IPv6 net. What I'm doing now is: stop radvd write to radvd.conf restarting radvd But this is quite painful. I wonder if there ...
3
votes
1answer
256 views

AWS Load Balancer and IPv6

Allow me to apologize ahead of time. I know this question has been asked and in one way or another answered multiple times across the net. Problem is, all the solutions and answers are contradicting ...
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1answer
138 views

DHCP IPv6 and vendor-encapsulated-options

I was using this option on ipv4 to send some information to the host. On my host lease I have something like: supersede vendor-encapsulated-options = "MY INFORMATION"; On the DHCP client host I can ...
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1answer
112 views

ip6tables TPROXY not working

I have a problem, I need to have to run a java program on a port < 1024. authbind and jsvc are no alternatives, it is simply decided not to use. But using ip6tables -t mangle -A PREROUTING -p ...
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votes
1answer
213 views

Is it possible to configure a Cisco router to serve as a Teredo relay?

The router in question is a Cisco 871, show version as follows: Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(24)T8, RELEASE SOFTWARE (fc1) Technical Support: ...
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0answers
80 views

Connecting to IPv6 hosts when mobile and on a Surface?

Specifically, at my usual location, I have an IPv6 network which connects to the Internet via a static tunnel set up to Hurricane Electric's tunnel broker ( http://www.tunnelbroker.net/ ). This works ...
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2answers
107 views

IPv6 transition, firewall, router or “security switch” with firewall features?

It seems that I've lost the overview regarding IPv6 and all it's new features... We own a 3Com / HP OfficeConnect Gigabit VPN Firewall (3CREVF100-73) which has NO IPv6 support. Because we are ...
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1answer
180 views

Asterisk: Forcing a sip peer to connect via ipv6?

I've got an asterisk server that connects to an upstream provider over a WAN. The upstream provider supports both IPv4 and IPv6 connectivity, and the asterisk server is behind a NAT. When asterisk ...
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2answers
103 views

Why does ipv6 not specify a protocol version?

I am relatively new to dealing with network packets, but as I look into the ipv6 header formats, I do not see a place where the ipv6 headers define what protocol is used in the data section -- but the ...
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1answer
1k views

Multicast Listener Report Message v2

I run an ICMPv6 protocol and I have made a capture using wireshark. In the capture I have some Multicast Listener Report Message v2. Some of the has the source ip, the ipv6 link local address, but ...
16
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2answers
736 views

Convenient public IPv6 test addresses

Are there any convenient public, globally routable test addresses for IPv6? Similar to how 8.8.8.8 and 8.8.4.4 tend to get used this way for IPv4?