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, ...

learn more… | top users | synonyms

5
votes
0answers
71 views

Setting up IPv6 ACLs on 3com 5500g to block Router Advertisment messages

Is there a way to set up IPv6 ACLs on 3com 5500g switch to block RA traffic on access ports? I couldn't find settings for setting up any IPv6 ACL. Acording to guides, there should be ipv6 specific ...
4
votes
0answers
130 views

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 ...
4
votes
0answers
193 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. ...
4
votes
0answers
202 views

Some systems not attempting to register IPv6 reverse

I have a few Windows 2012 systems in my domain that are not dynamically updating their records in the ip6.arpa zone for their assigned IPv6 addresses. I have systems that are publishing their record ...
4
votes
0answers
708 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 ...
4
votes
0answers
1k 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 ...
4
votes
0answers
2k 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, ...
4
votes
0answers
2k views

NAT64 configuration with tayga on Debian 6

I'm trying to implement NAT64 with tayga on my server and came to a point where I'm not sure how to proceed. My server is connected via one IPv4 address and one /64 IPv6 address block to the ...
4
votes
0answers
1k views

Enabling IPv6 with OpenVZ using Proxmox 2.2

I'm trying to enable IPv6 on my Debian nodes (OpenVZ) using venet; my host is under Proxmox 2.2 (kernel 2.6.32-16-pve), and it seems the routing fails. My host correctly pings all my nodes; all my ...
2
votes
0answers
130 views

Server 2008 R2 NIC in “Unidentified Network” state after connectivity loss is restored

I am having trouble with 2 servers, both with the same symptoms. When they are reconnected to the switch after losing connectivity, they stay in an "unidentified network" state. Only after cycling the ...
2
votes
0answers
154 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 ...
2
votes
0answers
261 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 ...
2
votes
0answers
240 views

ISC DHCPD IPv6 for multiple interfaces

I want to assign multiple IPv6 to a server with multiple NIC. As IPv6 RFC defines, each server has a unique DUID that can have one of the 3 formats (LL, LLT or enterprise). And each NIC has an IAID. ...
2
votes
0answers
444 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 ...
2
votes
0answers
768 views

KVM Guests & IPv6, Connectivity breaks after some time

Goal: Assign public available IPv6 adress to every guest Problem: Working IPv6 connectivity suddenly stops working. After starting everything up (network on host, guests) everything works fine. i can ...
2
votes
0answers
563 views

configuring IPsec with IPV6

I am working with racoon tool and ipsec-tools and I have been able to connect two devices with IPSEC working in transport mode. However, I did it with IPv4 addresses and when I change them to IPV6 ...
1
vote
0answers
36 views

Openbsd 5.7: IPv6 advertisement not working

--context-- I have a Sokeris with 8 interfaces: em0 is connected to a bridge router (ISP) and em2 is connected to my DMZ network (web servers). I got from my ISP a /56 prefix and 2 DNS IPs but no ...
1
vote
0answers
77 views

Ubuntu 14.04 ignoring SLAAC IPv6 configuration

I am having issues getting an Ubuntu 14.04 server to pickup an IPv6 address through SLAAC. I have gone through the process of changing all the configuration settings I could find through google, but ...
1
vote
0answers
100 views

Ipv6 over bridged network stops working after some time (Ubuntu LXC)

i hope you can help me. I am running several Linux Containers on a bare metal server which is provided with an Global Ipv6 address as well as an 64-bit network by my provider. I have configured IPv6 ...
1
vote
0answers
36 views

More Than One Static Address Binding for DHCP?

I have my DHCP server setup to be connected to three subnets (ie: 2001:abab:1234:1:: or 2001:abab:1234:2::) using three unique IP addresses, except in DHCP server binding properties I can only see one ...
1
vote
0answers
59 views

Windows Server 2012R2 DHCP Scope Preference

I have three scopes setup in DHCP. Subnets 0, 1, and 2; setup with the preference of 1, 2, and 3 respectively. Yet when I tell a client to renew its address it gets an address from subnet 1. What is ...
1
vote
0answers
76 views

Linux ipv6 forwarding

Situation I know how to do ipv4 forwarding, and expected ipv6 forwarding to work pretty much the same way. So I configured a VirtualBox host with the network address configured from my ISP. Right ...
1
vote
0answers
54 views

DNS not working with Ipv6

I'm trying to configure bind for ipv6 protocol.I have added the entries to the zone and configuration files but still the ipv6 IPs are not returned when i try for nslookup.Can someone guide me to ...
1
vote
0answers
74 views

Ubuntu Router to connect two networks via IPv6

I am currently in the situation that I want to add one network of homogenous linux nodes to an already existing windows network. For administrative reasons the linux nodes are not going to be added to ...
1
vote
0answers
60 views

IPv6 Forwarding between interfaces

I am attempting to simulate an ipv6 wan (on an airgapped network). I have a CentOS 6 machine in the middle with eth1 and eth2 each pointing to an ipv6 network (call them "north" and "south"). North ...
1
vote
0answers
79 views

how to set “Accrept snmp packets from these hosts” with IPv6 address

As I understood SNMP service on windows vista and above supports IPv6. I would like to set the accepted hosts with IPv6 address, how is it done? Using the SNMP service configuration of windows there ...
1
vote
0answers
77 views

ipv6 address assignment via local server from isp assigned block

I have been looking around and found the information confusing as best. Is there a way to have a server "recieve" the /64 ipv6 block from the isp and then use dhcp or something to assign it out to ...
1
vote
0answers
154 views

OpenVPN: unable to reach clients over IPv6

Current setup: OpenVPN server with IPv4 and IPv6: [...] port 1234 proto udp6 dev tun server 10.9.8.0 255.255.255.0 server-ipv6 2001:1af8:3100:a00a:0021:a:b:0000/112 client-to-client [...] Clients ...
1
vote
0answers
117 views

Why privacy ipv6 address cannot connect the internet in guest vm

I have a guest ubuntu 14.04 installed in kvm, host is a fedora 20. The eth1 nic of guest is in macvtap bridge mode. Ubuntu default enables ipv6 privacy extension, and prefers the temporary address: $ ...
1
vote
0answers
51 views

Problem with v6 subnet routing

I have a freebsd machine connecting to my sixxs ayiya-tunnel. As I decided to implement IPv6 in our complete network and not only one interface I got myself a routed /48 from sixxs. I'll use ...
1
vote
0answers
107 views

how to design network for virtual machines with just one nic

for the past week or so i've been recovering from the shock that i have literally no idea how my isp's network works, by getting a new box and trying to do a sensible design from scratch. our design ...
1
vote
0answers
103 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 ...
1
vote
0answers
116 views

IPv6 and AdvManagedFlag

RA messages have AdvManagedFlag. If this flag is ON then host "should use stateful autoconfiguration to obtain addresses" (RFC 2462). But RA messages are processing by the kernel. How do we know that ...
1
vote
0answers
101 views

snmpget on IPv6 local address timesout though snmpd is listening on ipv4 and ipv6

I am doing snmpget from a RHEL machine to the localhost. It works for IPv4 and doesn't work for IPv6. # snmpget -v2c -c public udp6:[::1] sysName.0 Timeout: No Response from udp6:[::1]. # snmpget ...
1
vote
0answers
115 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 ...
1
vote
0answers
95 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 ...
1
vote
0answers
260 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 ...
1
vote
0answers
707 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
0answers
308 views

How do I configure stateful DHCPv6 in Windows Server to allow clients to ping each other?

How do I configure stateful DHCPv6 in Windows Server to allow clients to ping each other? I would like to configure my Windows 2k8 DHCP server to distribute IPv6 addresses in my office network that ...
1
vote
0answers
441 views

Using TomatoUSB and OpenVPN to tunnel IPv6 traffic

Assume the following scenario regarding the current IPv4/OpenVPN setup: Central Site with a /64 IPv6 (10.0.0.1) | | OpenVPN Server A OpenVPN Server B ...
1
vote
0answers
444 views

Linux tc Traffic Shaping for IPv6

I have traffic shaping with tc and htb in place and everything works fine for IPv4. Now I want to limit the bandwidth for incoming IPv6 ssh/sftp traffic to some reasonable amount, so it doesn't ...
1
vote
0answers
163 views

Automatic DNS population for routable IPV6 addresses

In ipv4 I can set my DHCP server to populate DNS with hostnames and IP addresses as clients are found. This works well and clients can resolve these DNS addresses to contact eachother over routed ...
1
vote
0answers
722 views

why ping6 fails if tcpdump shows ICMP6 request/reply traffic?

I'm having a very strange problem with IPv6 pings on OpenWRT (fon-ng firmware with IPv6 enabled) and hoping someone can help with investigation. In short - wpan0 interface with address aaaa::1/64 is ...
1
vote
0answers
208 views

Attempting to DNS resolve / relay an IPv6 address for a host

I have a network switch doing IPv6 DNS relay to a Linux box (3.0.4-gentoo #7). The packets (DNS request) are arriving fine at the Linux box. Where I'm stuck now is how to resolve those, either by ...
1
vote
0answers
825 views

I am not able to ping the IPv6 address asigned to the interface on CentOS 5

I have assigned a stativ IPv6 address to eth2 interface and I am not able to ping it. Here is the configuration setup done in /etc/sysconfig/networking/device/ifcfg-eh2 # Intel Corporation 82546EB ...
1
vote
0answers
571 views

IPv6 network in Hyper-V private virtual network

I have created a private virtual network in Windows 2008 R2 hyper-v. Two guests with an adapter each connected to this network is able to ping each other if they use IPv4(used 192.168.10.19 and ...
0
votes
0answers
19 views

can't permanently delete automatic MAC-based inet6 address

Although I never explicitly configured ipv6 on my rhel servers and only have static ipv4 configuration in /etc/sysconfig/network-scripts/ifcfg-eth0, an automatic ipv6 address based on MAC address ...
0
votes
0answers
34 views

Setting up stateful DHCPv6 on Linux

I want to set up a DHCP server on my local network for IPv6 that issues addresses and further information like DNS/NTP and so on. From my ISP I got the IPv6 Prefix which I will refer to as in further ...
0
votes
0answers
23 views

Bind, IPV6, and Out of Zone Data

I am running into some problems getting bind properly configured to support IPV6 hosts. IPv4 is working fine, no issues. My zone file has both IP4 and IP6 data intermingled which I believe should ...
0
votes
0answers
82 views

OpenVPN can't ping host outside local network

After an entire day spent to let openvpn's client get their ipv6 and ipv4 at the same time now i have a big problem. ipv4 works fine From my openvpn server i can ping6 every host From my openvpn ...