Refers to the 4th revision of the Internet Protocol, where addresses are usually displayed in the form of dotted decimals between 0-255. Ex: 169.254.0.1

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0answers
40 views

Mystery IP address attached to Windows Server

While scanning my network I came across a mysterious IP address which shows no open ports but responds to pings. It is in the range of static IPs I reserve for servers. When checking arp table of PC ...
2
votes
1answer
33 views

OpenVPN with mixed ipv4 and ipv6 clients

I have a VPN server handling various clients; some with ipv4 only, some with ipv4 and ipv6, and some that will be ipv6 only. Some of these clients are roaming, so ideally they should connect to ipv6 ...
1
vote
3answers
19 views

Is there a way to allow all external ip connections (i.e ipv6 as well as ipv4) in FreeRadius?

I need to accept all incoming connections to the FreeRadius server be it ipv6 or ipv4. I know that we can allow all ipv4 clients with: client 0.0.0.0/0 { secret = abcde shortname = xxxx } How ...
0
votes
3answers
45 views

How to forward port traffic to public IP in Win2K8

I need to forward traffic coming in to a server from a public IP over a specific port (port 7575) to another public IP address on (preferably) the same port. I am using Windows Server 2008 R2 on the ...
2
votes
0answers
66 views

Powershell - Sort-Objects, list of IP Adresses

I got a /20 network and I want to know all used IP Adresses and their attributes like the MAC, the name and the description plus all free addresses between the used ones so that I got a long list ...
3
votes
2answers
296 views

Do you need separate ipv4 and ipv6 listen directives in nginx?

I've seen various config examples for handling dual-stack ipv4 and ipv6 virtual hosts on nginx. Many suggest this pattern: listen 80; listen [::]:80 ipv6only=on; As far as I can see, this achieves ...
0
votes
1answer
56 views

How to start with IPv6 subnetting on linux gateway

We are currently having perfectly working IPv4 network with a typical layout - internal network with all servers splitted to VLANs in 10.0.0.0/8 (each vlan is /24) and external network with public ip ...
1
vote
1answer
31 views

End-to-Edge Protection on DirectAccess

Learning about DirectAccess. This is a diagram of End-to-Edge protection Once the data goes in the corporate network, it doesn't matter whether the corporate network is running on IPv4 or IPv4. ...
1
vote
1answer
54 views

How does this ipv4 network card understand this ipv6 listening server?

So, I just setup a new server on a droplet and looking at eth0 with ifconfig I can see that the network card is setup for one IPv4 address and one IPv6 address (IPv4 changed for protection): inet ...
0
votes
1answer
74 views

IPv4 Nating and IPv6 Bridging

We have only 5 usable static IPv4 IPs and many IPv6 static IPs. We want Multiple nodes/pc to be connected with Internet using nating/router because we have limited number of IPs. We would still want ...
-4
votes
1answer
53 views

Do anycast addresses imply IPv6? [closed]

From what I understand, as a random user on the Internet, you cannot really know if an IPv4 address is unicast or anycast. However if you ping that IPv4 from two hosts physically located on two ...
0
votes
0answers
22 views

Assigning Outbound ipv6 Addresses to Users via Squid-Cache Proxy?

I know that I can assign ipv4 listening ports that route to outbound ipv6 addresses for connections to ipv6 sites using Squid-Cache but the problem is there's a limit on the amount of listening ports ...
1
vote
0answers
75 views

Squid Proxy: How to link inbound IPv4 ports to outbound IPv6 Addresses

I'm using Squid and I need to accept inbound connections on an ipv4 address using an ipv4 port that each user account link to an specific outbound ipv6 address. So for example I want to open port 4000 ...
0
votes
0answers
195 views

Windows computer with static IP and 169.254 APIPA address

I have a Windows7 Pro computer being used as a server to control our IP cameras. Recently, it refuses to connect to any of the cameras, even though the cameras themselves are working. I can access ...
-2
votes
1answer
52 views

What would be the side effect if I use network address as my IP address? [closed]

I have read at multiple places that network address is a reserved IP and is not recommended to be used as an IP address for an interface. However, I do not see any immediate error or other side effect ...
3
votes
1answer
64 views

What interaction is required for a Windows server and Cisco router to setup and destroy a Multicast session?

I'm trying to understand how Multicast actually works, and have read numerous articles and Wiki pages, and have gathered this: A multicast address takes up state on the router of the membership, ...
0
votes
0answers
87 views

Ubuntu refuses to route packets for public subnet through linknet

I've run into the novel concept of routing through a linknet from my new ISP, and am currently trying to get a /28 routed properly on my Ubuntu 13.10 server. However, this is proving futile. This is ...
0
votes
3answers
137 views

How does anycast work with tcp?

TCP, being stateful, should require subsequent packets to reach the same server. (Stateless) HTTP runs on top of TCP, and CDN's can use anycast. So how does TCP work with anycast? What if the syn ...
4
votes
2answers
293 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
92 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
110 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 ...
1
vote
2answers
146 views

How can I change metric of public network in route table

In my windows 8.1 ENT [64 bit] machine I have 3 network adapters. Ethernet 1 is connected to public network and other 2 ethernet adaptors are connected to different internal networks. The problem is ...
1
vote
0answers
19 views

IPv4 header options handled different in Win7 and WinXP

If I send an ipv4 packet with (non standard) options to a WinXP host, it works as I expect it to do: The packet is handled correctly. If I send the same packet to a Win7 host, the packet is answered ...
-1
votes
1answer
55 views

how to 2 ip virtual in public dan private with forward to different destination

Here my case, Server 1 public IP in 1 box (eth0) -> 203.x.x.55/28 and 57/28 gw 203.x.x.49 private IP (eth1) -> 10.10.8.1 Server 2 private IP in 1 box (eth0) -> 10.10.8.5/24 and 7/24 gw 10.10.8.1 ...
2
votes
2answers
125 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. ...
0
votes
1answer
113 views

Making a reverse zone file on a 255.0.0.0 subnet

I’m trying to setup a reverse zone file for this subnet that has two hosts on it: 10.10.100.10 and 10.128.5.10. This means he netmask for the subnet would be 255.0.0.0. I inferred that the file name ...
0
votes
1answer
104 views

can I use DNS with private NAT addresses?

I want to build a service that dynamically creates VMs and assigns each VM a public DNS record which could be a full domain or a subdomain. Assume the VMS all live on a single host. The VMs will have ...
2
votes
2answers
87 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
508 views

Route IP to OpenVPN client

I have to external IPv4-IPs at my VPS. I want to route one to a VPN client, OpenVPN (tun). Only one VPN-Client should use the VPN, and I want to route all traffic to my second external IP to this VPN ...
0
votes
1answer
130 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 @ ...
0
votes
1answer
68 views

iptables NAT forward range

I have two network interfaces, eth0 and eth1. eth0 has a public ip, eth1 has 172.16.0.254/24. I'd like to do the following mapping: 172.16.0.1:22 -> eth0's public ip:2001 172.16.0.2:22 -> ...
1
vote
1answer
141 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
1answer
41 views

change timeout for dropped ip traffic

I am behind a corporate firewall, which simply drops (swallows) all ip-traffic to unknown ip-addresses. It takes a lot of time for Linux (Ubuntu 13.10) to abort my erroneous connection-attempts, ...
2
votes
1answer
45 views

Should we accomodate a customer asking us to NAT servers behind new PUBLIC IPs within a VPN?

We're a SaaS provider, setting up a IPSec VPN between our data center and a customer's site so they can directly access their hosted database server from their LAN. Instead of exposing our internal ...
7
votes
7answers
890 views

Best choice of private addresses for a “device area network”

I'm building an appliance consisting of several subdevices connected by ethernet inside the appliance. The appliance will connect to the customer network. The customer network can be using private ...
0
votes
0answers
230 views

Repair RRAS and NAT on Windows Server 2008 R2

We have a Windows Server 2008 R2 server with RRAS installed and configure with VPN and NAT. NAT stopped working and when I checked, IPv4 is missing . I've tried re-installing RRAS but it just ...
1
vote
1answer
106 views

no internet connection when in private network [closed]

I have an ubuntu server with a public IP, which I can reach with ssh from my local machine. However, when i put this server in a private network, I can no longer reach it with ssh from my local ...
0
votes
0answers
420 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
vote
2answers
63 views

Make NginX serve different pages depending on the IPv4 encoding base

You can access google on 186.215.155.54 , 0xBAD79B36 or 3134692150 (remember to put http:// before if you want to try). How is the base conversion handled by the browser? Is there any way for NginX ...
2
votes
1answer
318 views

Dell VRTX get ip address of server attached to chassis

I wanted to know if there is any racadm command to get the ip address of the attached server's in a dell VRTX chassis. racadm getslotname will give the Host Name of the server but not the ip ...
1
vote
5answers
1k views

What constitutes valid justification for more IP addresses?

I host a small website with a well known VPS service. They provided me with one IPv4 address upon registering and said additional addresses would require justification. I requested one additional IPv4 ...
-1
votes
2answers
216 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
177 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
232 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
2answers
1k 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' > ...
3
votes
1answer
122 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
2answers
778 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. ...
2
votes
1answer
1k 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
304 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
359 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 ...