1
vote
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. ...
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 ...
2
votes
1answer
138 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 ...
4
votes
3answers
194 views

In Linux, how can I automatically assign an IPv6 address to an interface based upon its IPv4 address at boot time?

On a CentOS 6 machine, I have a server with 2 NICs, eth0 and eth1. eth0 has address 192.168.0.1. I would like to create a script that parses the IP address of eth0 and assigns a similar-looking IPv6 ...
12
votes
2answers
419 views

Why does /proc/net/tcp6 represents ::1 as ::100:0

I was writing an utility to check /proc/net/tcp and tcp6 for active connections as its faster than parsing netstat output. As I dont actually have ipv6 enabled I was mainly utilizing localhost as my ...
0
votes
1answer
81 views

iptables dual stack - ipv6 not working

I have problem with my iptables setup. I want to have completely dual stacked server so I use same rules for IPv4 and IPv6. However all IPv6 connections are just being dropped while IPv4 are working ...
1
vote
1answer
94 views

Linux 6in4 tunnel server can't properly forward IPv6 packets due to failing neighbour discovery

I am trying to set up 6in4 tunnel server on my VPS. Client and server can ping IPv6 address of each other, when I try to ping an outside server from the client, I get ICMP address unreachable error. ...
2
votes
2answers
109 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
votes
2answers
63 views

TCP Statistics for IPv6

I'm using Linux RHEL55. I need to collect tcp6 statistics data. if i run "netstat -s", it gives data only for tcp and not for tcp6. But we can get tcp connection status for ipv6 in windows. why we ...
1
vote
2answers
414 views

Why does NTP daemon keep listening on UDP6?

I have a clean Debian 7 installation, and I manually entered the following lines in /etc/ntp.conf: interface ignore wildcard interface listen <local_nic_ip> Hoping that NTP will no longer ...
0
votes
1answer
89 views

ip6tables only allow packages to a certain ip-range

I am trying to configure ip6tables to only allow ssh connections to a specific range. In iptables the command would be: iptables -A OUTPUT -p tcp --dport 22 -m iprange --dst-range ...
1
vote
0answers
151 views

IPv6 Routing / Subnetting

Recently I have installed Citrix Xen Server 6.2 on a machine. My Provider (Hetzner) gave me the IPv6 Subnet 2a01:4f8:200:xxxx::/64. Followed an article in the providers wiki (1) i got it working and ...
4
votes
1answer
741 views

Docker will only bind forwarded ports to IPv6 interfaces

Is there a way I can tell docker to only bind forwarded ports to IPv4 interfaces? I have a machine running on Digital Ocean with IPv6 disabled: # echo '1' > ...
0
votes
1answer
546 views

XenServer 6.2 IPv6 routing

I'm having trouble setting up a new server (hosted at "hetzner") with latest XenServer 6.2. IPv4 is working fine, but I'm stuck at IPv6 Setup. What I got so far: xen: $> ip -6 addr 1: lo: ...
1
vote
2answers
369 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 ...
2
votes
0answers
158 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 ...
4
votes
1answer
827 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 ...
1
vote
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 ...
0
votes
1answer
92 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 ...
1
vote
1answer
254 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 ...
-1
votes
1answer
1k 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 ...
1
vote
1answer
77 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
votes
1answer
279 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 ...
1
vote
2answers
152 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 : ...
0
votes
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 ...
5
votes
2answers
308 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 ...
2
votes
1answer
254 views

Configuring ufw or iptables to allow only outbound traffic to the Internet from an internal IPv6 network

How do I configure ufw or iptables to allow only outbound traffic from an IPv6 network to the Internet? I have an office network with a traditional NAT setup for IPv4. I would like to add a PC ...
0
votes
2answers
97 views

IPv6 reverse not resolving for Linux shell “last” and “who”

IPv6 is properly resolving in DNS: > host 2607:fa18:0:2::17 7.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.0.0.0.0.0.8.1.a.f.7.0.6.2.ip6.arpa \ domain name pointer sine.xmission.com. However, the ...
0
votes
4answers
3k views

IPv6 only works after pinging the default gateway.

We now have 2013 and I thought it is long overdue to activate IPv6 on my server. But unfortunately, I ran in some problems. To be honest I only have litte experience with IPv6 So I hope you can help ...
4
votes
2answers
128 views

IPv6 prefix management

So, my SiXXS' POP seems to be in trouble and I was thinking in changing to HE. The idea is connect to HE, change radvd setup and... lots of other thinks: UFW, specially in laptops, which only allows ...
3
votes
1answer
171 views

ip command vs route command, what's the difference?

I see both ip and route commands used for configuring the kernel routing tables. What's the difference? It seems to me that the ip command is preferred more. Is it so, and why?
-1
votes
3answers
1k views

SNAT in IP6Tables

Netfilter says they have support for SNAT and DNAT for ipv6. I look under the man pages of ip6tables and see that there is SNAT and DNAT listed. So my question is how do you make rules for them? I ...
0
votes
1answer
679 views

Got “RTNETLINK answers: Invalid argument” when trying to add a IPv6 route

When I try to add an IPv6 route I get an error message: root@lx-anielsen ~ $ ip -6 route add ::a:6:0/112 via ::a:4:1 dev eth1.1001 RTNETLINK answers: Invalid argument Here is what my interface ...
4
votes
1answer
259 views

Linux server reboot brings down LAN network

I have a strange problem in my office network. I have a physical server which runs ESXi 4. Every time I reboot a linux virtual machine (Ubuntu Server 12.04.1 LTS) the entire LAN network goes down. ...
1
vote
1answer
485 views

IPv6 web servers without IPv4 address

IPv4 IPs getting rare and more expensive and I wonder if it is possible to switch our web servers completely to IPv6. I know it is advised to use IPv4 and IPv6 but I still would like to know: Is ...
2
votes
0answers
1k 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 ...
1
vote
1answer
95 views

Can't get right with IPv6

I got an IPv6-Subet 1009:2417:25:41::/64 - the first ip should be the gateway - is 1009:2417:25:41::1 right? Can you give me a Site or a tutorial how to get the first 100 Host-IPs? (I think some of ...
3
votes
1answer
1k views

Forwarding IPv6 traffic

How can I forward IPv6 traffic from my tun0 interface to the eth0 interface? ifconfig: eth0 Link encap:Ethernet HWaddr 00:16:3E:12:77:54 inet addr:208.111.39.160 ...
1
vote
0answers
247 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 ...
3
votes
2answers
281 views

/64 routed to my assigned IPv6 address?

So I have a vps provider for a linux server, it states this in my network dashboard on their site: 2607:f840:0044:0022:0000:0000:0000:0000/64 is routed to this server (2607:f840:0:3f:0:0:0:eaa) ...
1
vote
1answer
544 views

Virtual IPv6 Network between VirtualBox VMs

I'm trying to create a virtual IPv6 network as a test environment. I have 5 VirtualBox VMs (Ubuntu Server) with network adapters using host-only networking. You can imagine them being connected in ...
1
vote
1answer
221 views

IPv6-“GARP”/ Gratuitous ND

I am maintaining an office network with several VLANs. These VLANs are terminated by a redundant pair of Linux boxes as router. Between those I am running VRRP (with keepalived). On failure I am ...
2
votes
1answer
182 views

Linux IPv6: DHCP and /127 prefixes

I've tried multiple pieces of DHCP client and software in attempting to setup a solution for allocating a /127 prefix to virtual machines so that each maintains its own layer 2 isolation. Because ...
0
votes
2answers
149 views

IPv6 static routes

I am looking to configure a few hosts with IPv6 on my network. The router (running CentOS 5) is configured with an Hurricane Electric (HE) tunnel which works fine on that host. However, I would like ...
0
votes
0answers
178 views

“Connection refused” after setting up IPv6 on Debian

I just set up IPv6 on Debian Squeeze on a hosted root server. Since I rebooted I can't connect to the server anymore. Ping is fine, but HTTP and SSH won't work. When I try to connect with SSH using ...
0
votes
0answers
606 views

Default IPv6 route on debian squeeze does not come up after boot

I have a problem with my default IPv6 route not coming up after boot on a Debian Squeeze system. This is my config (/etc/network/interfaces): # Loopback device: auto lo iface lo inet loopback iface ...
12
votes
2answers
1k views

Is there a Linux kernel boot parameter to configure an IPv6 address?

I know there is a parameter named ip which lets you configure IPv4 addresses on the Linux kernel through the boot loader. That looks like the following: ...
5
votes
1answer
435 views

IPv6 working fine, IPv4 throws OpenSSL error

I am building a webserver ( http://blog.linformatronics.nl/ ), which functions just fine on both IPv4 and IPv6 and when using a non-SSL connection. However when I connect to it through https, IPv6 ...
3
votes
2answers
350 views

List IPv6 Neighbor Proxies in Linux

With the command like these the following you can add neighbor proxies in Linux ip -6 neigh add proxy 2001:db8:100:3022:1::4 dev eth0 Is there a way how to list which proxies have already been ...
0
votes
1answer
291 views

Can these IPv4 and IPv6 firewall rules be hardened any further? [closed]

I am running Ubuntu 10.04. Here are the IPv4 firewall rules that I've been using now for a few months: *filter #Allow all loopback (lo0) traffic and drop all traffic to 127/8 #that doesn't use lo0 ...