4
votes
2answers
249 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?
0
votes
1answer
21 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 ...
0
votes
1answer
22 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 ...
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. ...
2
votes
2answers
80 views

Logging the outgoing port for IPV4

I need to become an IPV4 and IPV6 expert in a couple of hours. Our company is being bullied by the internet legislator in our country to move fast to offer the site in IPV6 only (we are just content ...
0
votes
1answer
76 views

Attack from strange IP address, how to block?

Looking through the mail logs I've noticed a lot of these: Apr 7 11:33:25 s123456 pop3d: IMAP connect from @ [::ffff:192.96.206.9]checkmailpasswd: FAILED: web14p3 - short names not allowed from @ ...
1
vote
1answer
87 views

4in6 tunnel for heterogeneous systems [closed]

I have clients (OS X 10.9 and Linaro/Ubuntu) in a native IPv6 network and a Server (Debian) in both native IPv4 and IPv6. The Plan is to use the Server as a gateway of sorts, as in 4in6 ...
0
votes
0answers
309 views

Configuring DHCP IPv4 and static IPv6 on the same interface

I need to configure on a network interface (eth1) with static IPv6 and get an IPv4 address from DHCP on a CentOS 6 machine? Using the configuration below I only get a dynamic IPv4 address: ...
-1
votes
2answers
142 views

Cannot browse ipv4 websites (OpenVPN )

I have set up an openVPN tunnel on my VPS (OpenVZ - Ubuntu 12.04). The problem is when I'm connected to the vpn, I can only browse websites which support ipv6 like google. Ipv4 sites aren't loading ...
-1
votes
1answer
115 views

Setup IPv4 local on IPv6 VPS

I have a dedicated server running multiple IPv6 only OpenVZ containers. I want them to be able to communicate with the IPv4 internet, but I realized that isn't going to be possible with IPv6 only. So ...
2
votes
1answer
146 views

IPv4 header vs IPv6 header size

Just wondering from looking at that picture if Total size = payload size and the IPv6 header is bigger, does that mean Ipv4 packages can contain more data?
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' > ...
2
votes
1answer
93 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 ...
0
votes
1answer
428 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. ...
1
vote
1answer
434 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 ...
1
vote
1answer
224 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 ...
1
vote
3answers
266 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 ...
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 ...
0
votes
2answers
90 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
68 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? ...
2
votes
1answer
406 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
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 ...
0
votes
1answer
178 views

Getting DNS replies for non-existing hostnames (DNSMasq)

I noticed some 'weird' DNSMasq behavior when I set up my LAN for dual stack IPv4 & IPv6 networking. It seems that my DNS server (DNSMasq) which acts as a forwarder and also has all the host names ...
1
vote
3answers
95 views

RHEL (say 5.6, kernel 2.6.18-238) with dual IP address (IPv4v6)

So I have a SERVER that that utilizes RHEL's (assume 5.6) underlying kernel for setting up TCP connections and other networking aspects. My deployment need requires that the SERVER have dual IP ...
0
votes
1answer
138 views

IPv6 and IPv4 mapped address

I've a box with 1 private IPv4 (192.168.0.X) and some IPv6 (let's call one Y::Z). I have an application listening on 192.168.0.X on port 1234 and an application that want to connect to that service ...
0
votes
2answers
122 views

ngnix startup isse ipv4 & ipv6

I'm trying to get my first nginx server setup, and am having trouble setting up ipv4 and ipv6. I have this in the top of my config file (it's the only server block in the config file): server { ...
-1
votes
1answer
110 views

Apache2: Dual Stack mode IPV6 / IPV4 for existing IPV4 hostings [closed]

I'm planning to run my hostings in the IPV4/IPV6 dual stack mode for a lot of hostings / IPs. Short Apache example: ports.conf Listen 199.192.201.82:80 NameVirtualHost 199.192.201.82:80 Listen ...
0
votes
1answer
280 views

Getting ipv6 only on ubuntu server with vmware bridge connection

I have ubuntu server 12.10 on vmware. When I have NAT network configuration I get ipv4 address (checking ifconfig eth0). With bridged connection I get only ipv6 connection, but I need an ipv4 ...
0
votes
1answer
279 views

How can I get unique IPv4 and IPv6 visitor counts on nginx access.log in shell?

How do I get some stats on unique IPv4 and IPv6 visitors by looking at a nginx access.log with UNIX CLI? I use the standard combined pre-defined format for access_log.
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 ...
0
votes
1answer
250 views

SMTP - Remove IPv6?

We're doing a "try-out" of SmarterTools SmarterTrack (help desk) software. We can't get it to send email. We showed someone at SmarterTools our log - SmarterTrack keeps its own SMTP log - and they ...
1
vote
2answers
76 views

Forward traffic from IP6 to IP4

On my debian6 server is a process that only listen on IPv6 but I also need to listen on IPv4. It seems the program is IPv6 only. Is there a way to route the traffic fom IPv6 to IPv4 on the same host ? ...
1
vote
2answers
204 views

IPv4 as default IP in dual stack [closed]

I am having an issue in prioritizing my IP network in Windows 8 to use IPv4 as default. Currently when ever I browser IP detection sites, they show me IPv6 address. How do I change this behavior?? ...
1
vote
2answers
446 views

Can a global IPv6 address be NAT'd to an internal IPv4 address at a firewall-level?

As an organisation we've just requested our first IPv6 allocation. At present we are a wholly IPv4 organisation with a global IPv4 address allocation configured on our edge router and used ...
4
votes
2answers
450 views

IPv4 NameVirtualHost, IPv6 VirtualHost

Like many of us, I have an apache server (2.2.15, plus patches) with a lot of virtual hosts on it. More than I have IPv4 addresses, to be sure, which is why I use NameVirtualHost to run lots of them ...
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 ...
0
votes
1answer
66 views

Running IPv4 program in IPv6 network

I have an IPv4 windows client program and IPv4 Linux server. What I need is to run them in pure IPv6 network, although machines have dual stack. At the beginning I thought it's not a problem: I'll ...
0
votes
1answer
566 views

Which software could I use to setup a 4in6 IP tunnel (RFC 2473) on GNU/Linux

Here is my problem. I have a server A that has two IP addresses. One public IPv4 and one IPv6. Server B has only one IPv6 address. I want to host most of my services on server B (because I have more ...
1
vote
2answers
290 views

IPv6 very slow while IPv4 not on same server

I have a development and a production server, both running CentOS, on the same network with similar configurations. On one (the production server), when I do a curl, it attempts IPv6 first, but that ...
0
votes
1answer
383 views

Transparent SOCKS5 proxy for linux using dual stack IPv4 and IPv6

Can you recommend a SOCKS5 proxy for linux that can accept IPv4 requests, but connects to the internet using dual stack (IPv4 and IPv6)? It is going to run on Ubuntu with dual stack enabled. I ...
0
votes
2answers
165 views

Iptables: Drop all incoming IP4 traffic on a port

I want to drop ALL the ipv4 traffic on a certain port and only allow ipv6 traffic with iptables. Is it possible? is so, how?
1
vote
2answers
231 views

IPv6 connections routed to IPv4 device

I have an IBM 9406-250 with V5R1 and IPv4 only connectivity, and want it to be reachable over IPv6. I cannnot install an IPv6 stack on it, but I want it to be accessible by IPv6 so I can drop the ...
2
votes
1answer
42 views

Strategies physical server running multiple guests but having a single external IPv4

My hoster is - understandably - cutting down on IPv4 addresses offered with new servers so that the next time I re-locate my stuff to a new server I'll a huge number of IPv6 addresses, but only a ...
5
votes
4answers
487 views

Enterprise IPv6 Migration - End of proxypac ? Start of Point-to-Point ? +10K users

Let's start with a diagram : We can see a "typical" IPv4 company network with : An Internet acces through a proxy An "Others companys" access through an dedicated proxy A direct access to local ...
1
vote
1answer
289 views

Windows server trying to use IPv6 despite being turned off

I have a server which needs to communicate with another server (both win 2k8r2). One of them recently had an IP address change, and I suspect that the IPv6 address that the AD DNS server holds is now ...
0
votes
3answers
991 views

Pros and cons IPV6 vs stretched vlans

I'm having a hard time finding information about whether implementing ipv6 or using a stretched vlan is a better option for geographically dispersed sites is better. Does anyone know: Problems with ...
7
votes
4answers
3k views

Advantages of IPv4 over IPv6

In theory, how IPv4 is better than IPv6? I need only advantages of IPv4 for study purposes. In another words - what are the pros of IPv4?
3
votes
1answer
325 views

Subnet Masking in IPv6

I know within IPv4 subnet masking, the network is determined by either the 1st, 2nd or 3rd set of octets. Being there are so many more characters in IPv6, how do you determine the subnet mask?
3
votes
1answer
448 views

Renting a IPv4 address block [closed]

I am building a lab network with about 10 virtual routers and 20 host machines (also virtualized) as a part of a school project. The aim is to demonstrate a wide range of IPv6 routing, deployment and ...
-4
votes
3answers
1k views

Can I figure out if my server has IPv4 or IPv6 from a CLI?

Is there any method (via CLI) of knowing if the server I'm at has IPv4 or IPv6? EDIT: As for the reason why I'm asking this question (apologies if I wasn't specific enough), I'm referring to this ...