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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96 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 ...
2
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1answer
200 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
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1answer
183 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 ...
1
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0answers
155 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
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0answers
355 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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1answer
328 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
180 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 ...
3
votes
1answer
476 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
108 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
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2answers
157 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' ...
2
votes
2answers
793 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
80 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
223 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 ...
1
vote
1answer
134 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 ...
0
votes
1answer
105 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 ...
0
votes
1answer
180 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
101 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 ...
1
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1answer
166 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 ...
0
votes
2answers
94 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 ...
0
votes
1answer
924 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
729 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?
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2answers
162 views

Why do I still have traces of IPv6 on a linux host with IPv6 disabled?

When looking at my Observium monitoring, I just found strange results on this graphs "IPv6 Packet Statistics", this server is on a IPv4 network with IPv6 disabled on the server itself with : ...
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2answers
3k views

Getting an IP from an ipv6 dhcp server

I have the following lab: DHCP SERVER [Centos 6] /etc/dhcp/dhcpd6.conf default-lease-time 2592000; preferred-lifetime 604800; option dhcp-renewal-time 3600; option dhcp-rebinding-time 7200; allow ...
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0answers
525 views

IPv6 routing over OpenVPN

Trying to learn how IPv6 works with OpenVPN, so I wanted to setup following scheme. I have a VPS server (Ubuntu), which have been allocated a /48 subnet. ISP ipv6 gateway is XXXX:XXXX:XXXX::1 Server ...
1
vote
2answers
269 views

Globally setting ipv6only=off

Since an update my nginx server is only available via IPv6 and not IPv4 while my config contained listen [::]:80 default_server; Now I've changed this to listen [::]:80 default_server ...
0
votes
2answers
53 views

Adding an ipv6 range with dual stack [duplicate]

I have a range of ipv6 addresses available (native) and want to use them. I 've setup the kernel to support ipv6 and installed the necessary tools (iproute2 etc). I am having a problem understanding ...
1
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0answers
182 views

Assign IPv6 addresses to kvm virtual machines using DHCP

I created a bridge using brctl called dhcp_test_br, and bind my new created kvm virtual machine to this bridge. Then I ran dnsmasq: dnsmasq --strict-order --bind-interfaces --interface=dhcp_test_br ...
5
votes
2answers
329 views

Linux: Block IPv6 for certain applications / hostnames

Problem and aim We don't get IPv6 from our ISP thus I have an IPv6 tunnel which works fine but is, of course, not very fast. And not really reliable. I like to have IPv6 available "just in case" but ...
0
votes
1answer
184 views

Can't ping6 a network interface from a different Ubuntu computer

I cannot ping6 the network interface "tun0" on the host computer from a virtual machine. Using vmware, I installed a Ubuntu 12.04 virtual machine, that is connected to the host machine with NAT. ...
0
votes
1answer
85 views

Ubuntu IPv6 setup for LAMP and Mail Server

I noticed my ip6tables are not configured on my newish server, but well supported by my VPS and I have some idea about how to implement ipv4 rules, but know nothing about ipv6, I've tried looking ...
0
votes
1answer
124 views

apache2 won't start on boot because of “no listening sockets available” error

When booting a debian wheezy server using apache2 version 2.2.22, the apache autostart fails with the following error: Starting web server: apache2(99)Cannot assign requested address: make_sock: ...
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votes
1answer
82 views

How multicasting grouping address works ? How can I add nodes to the existing group of multicasting group? [closed]

I am a newbie to the networking and working on the 6LoWPAN protocol and I am trying to get the multicasting to work on the network. But I don't know how to create group for multicasting and how to ...
0
votes
1answer
71 views

MAC Address & IPv6

While MAC addresses are 48 bits, that is a lot more than the 32 bit IPv4 adresses (even counting the reserved addresses 255, 127, Class D Multicast etc ), will we not eventually run out of them? ...
1
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0answers
257 views

Some workstations/servers on the domain respond with IPv6 instead of IPv4 addresses, even though IPv6 is disabled across the board

Earlier this week I've noticed some issues on my network. For example when I ping my machine (from my machine) using the hostname (or FQDN), I see a response from an IPv6 address. ...
1
vote
1answer
686 views

Windows Server 2012 DNS: default forwarders disables root hints

I've set up a test domain to experiment with windows server 2012. Initially I kept my test machines on a isolated network, but today I installed a pfsense machine to route some traffic to the ...
2
votes
1answer
762 views

Squid proxy: how to link inbound IPv4+port to outbound IPv6

I'm trying to setup a squid proxy that will accept multiple inbound connections on one IPv4 across a range of ports, and for each port connection to connect out on a unique IPv6 address. I've named ...
0
votes
1answer
28 views

Getting error while assigning ipv6 to interface

Hi I am trying to assigning ipv6 address like this: ip -6 address add be2::176/64 eth19 Error: either "local" is duplicate, or "eth19" is a garbage.
0
votes
2answers
258 views

Can IPv6 IPSec replace https/ssl for secure website network encryption?

Take away the 'authentication' part and just talk about the encryption part please! (Authentication is a different problem.) Example: a connection to http://ipv6.google.com can be encrypted via HTTPS ...
0
votes
1answer
128 views

Howto enable IPSec with IPv6 automatically?

Although IPSec is included in the IPv6 protocol, this doesn't mean that it gets actually used. I know how I could create a VPN manually via e.g. racoon or any other VPN-Server software, but that's ...
0
votes
4answers
657 views

Windows 7 resolve localhost name with ipv6 instead of ipv4 [duplicate]

When I ping localhost I can see that localhost name is resolved as :::1 instead of 127.0.0.1. Do you know how to solve this? I need a ipv4 resolution of localhost for Tomcat server. I could quickly ...
0
votes
1answer
132 views

Disable ipv6 autoconfiguration on a specific interface in OSX

Is it possible, either via the command line or C code using the sysctl/fcntl/etc. APIs, to disable IPv6 router solicitations, router advertisement acceptance, etc. on OSX for a specific interface? It ...
1
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2answers
63 views

Identifying SNMP packet from just the IP header

Is it possible to identify an SNMP packet from just the IP header?
2
votes
1answer
474 views

CentOS, ifdown on virtual interface removes IPv6 addresses on physical interface

In CentOS 6.4, when using 'ifdown' on a virtual interface, the IPv6 addresses configured on the physical interface are also removed. I expect only the virtual interface to be changed. How can I ...
1
vote
1answer
59 views

Server 2008 IPv6 Connectivity issues

I am having issues with my IPv6 connectivity via Windows Server 2008. External traceroute shows each hop along the path, including the servers gateway. It then times out, never reaching the host. ...
0
votes
1answer
87 views

Reverse-resolved address ending with .bng?

I routinely check netstat --tcp when ssh'ed into my server, but today found an odd hyphenated address format that I haven't seen before: Proto Recv Sent Local Address Foreign Address ...
2
votes
0answers
1k views

ip6tables port redirect with TPROXY on IPv6 only

Our server is IPv6 only connected and an applications listen to port 8080 at private network, but we need port 80 at public Internet. On purpose of testing, when opening the firewall for port 8080, ...
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votes
1answer
65 views

IP testing tool similar to wireshark website [closed]

I am looking to implement a tool similar to the one linked below on my personal server/website what are the steps I would need to get started? http://www.wireshark.org/tools/v46status.html I ...
1
vote
2answers
139 views

ipv6 Unrecognised Command on Cisco 3400

I have two identical Layer 3 switches, running identical Cisco IOS Versions. One of the switches, I can configure with ipv6. The other switch however, tells me "Unrecognized command" when I try any ...
3
votes
1answer
76 views

How do providers plan to deal with rDNS for client /64 IPv6 blocks when assigned?

The standard block assigned to a home will be a /64 block to enable autoconfigure. This means the traditional reverse DNS mapping of host-237.miami.ispname.com is not only practical, it's improbable ...