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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Assigning 2 IPv4 blocks to one interface

I have been assigned these 2 blocks by my provider Block: x.x.x.184/29 Usable range: x.x.x.186 - x.x.x.190 Gateway: x.x.x.185 Subnet: 255.255.255.248 And Block: x.x.x.192/29 Usable range: ...
6
votes
5answers
357 views

No IPv6 & DNSSEC support on cc-TLD? (practical implications)

I'm needing to register some domains that have country code domain extensions, but noticed that those TLDs do not officially support (A) IPv6 or (B) DNSSEC... What limitations or pitfalls should I ...
0
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0answers
12 views

How to avoid looping of packets while implementing k-shortest paths algorithm in Network Simulator-3? [migrated]

I am trying to implement k-shortest paths algorithm in NS-3 for IPv4GlobalRoutingProtocol. I am concerned about how to avoid looping of packets. My implementation calculates k-shortest paths from ...
3
votes
1answer
36 views

Why doesn't the IETF reallocate IPv4 netblocks from regions that are over supplied?

I just was looking at the Hurricate Electric website, and it says that ARIN is out of IPv4 addresses. Meanwhile LACNIC, APNIC, RIPE, and AfiNIC have millions of unallocated IPv4 addresses. I did a ...
1
vote
1answer
54 views

IPv6 resolving as loopback/private IP

I'm running a web crawler and I received some reports from my datacenter about connections directing to private IPs (like 10.0.0.1). I've implemented a loopback/private ip check to my crawler code and ...
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0answers
23 views

Debian Host replies with ICMP Port Unreachable after Router Advertisement (ISATAP)

I'm trying to configure a Debian Wheezy host to get an IPv6 address via ISATAP (using isatapd). This machine has two outgoing interfaces: eth0 and eth0.20 (virtual interface using VLAN 20): 1: lo: ...
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0answers
57 views

ping between ipv6 and ipv4 networks

I have 2 networks (one ipv4 and one ipv6) , I used ospf as routing protocol for both networks. I activate bgp between this 2 networks(R6 and R1) and now R6 can ping the full ipv6 network and R1 can ...
2
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0answers
59 views

How to disable IPv4 use on OSX (Or disable Happy Eyeballs)

I have a OSX El Capitain (10.11.2) host that has only IPv6 connectivity. The network uses NAT64 and DNS64 to provide access to legacy IPv4 hosts on the internet. The problem is that when looking up a ...
1
vote
1answer
21 views

DHCPD configuration by interfaces

I have two interfaces on a machine running Ubuntu 14.04 LTS. Which has two different interfaces namely eth0 and eth1. I need to give IP addresses to the clients by the interfaces. For example, Any ...
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1answer
39 views

IPv4 SYN, ACK & RST issues

Good day, I asked this question in the Network Engineers StackExchange and was told to ask it here. I am running a roundup server (Ubuntu 12.04) and the roundup-mailgw (python script) is no longer ...
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2answers
85 views

Hosting is IPv4 only, can I have IPv6 clients?

My hosting is IPv4 only. My question is whether it is possible to allow IPv6 only clients to access my web (running Window Server 2012 R2). Is this possible using technologies like 6to4 or Teredo or ...
3
votes
1answer
70 views

Logstash - Graph IPv4 vs IPv6

I'm looking at starting to graph inbound connections to our various services (web, mail, dns etc) by IP version, ie IPv4 connections versus IPv6 connections. Currently the IPs are being stored in a ...
2
votes
0answers
48 views

cannot bind a port altough LISTEN

I'm new to this problem I'm using Ubuntu 12.04 LTS via VMware My problem is to bind port 6703 i tried alot of commands to check if this port or open or not Error Message is Failed to bind to: ...
-1
votes
1answer
27 views

Priority of dhcp servers

Let say there is a main Server which is assigning ips by dhcp to 50 different LAN ports in network.Now if at some LAN port we connect a small router on the yellow port(so that all other devices come ...
2
votes
1answer
60 views

ProFTPD IP masquerade just some ways

I am trying to setup a FTP server using ProFTPD on Xubuntu 15.10. Users will connect to this server in two ways: internally (using an internal IPv4 address) externally (using domain name pointed to ...
1
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0answers
92 views

ssh connection very slow and delayed [duplicate]

I have recently created and configured an ubuntu server 14.04.3 with the help of the ubuntu-core tools. Networking with IPv4 and IPv6 works fine for me with different clients. But a few days ago, i ...
1
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1answer
73 views

Zone configuration not working

I have these 3 files to configure a zone : /etc/named.conf zone "exemple.tn" IN { type master; file "/var/named/db.exemple.tn"; allow-update {none;}; }; zone "85.168.192.in-addr.arpa" { type ...
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0answers
49 views

Routing subnets per interface on a dual nic windows server

The server I'm working on has 2 NICs. C:\Windows\system32>route print =========================================================================== Interface List 20...00 50 56 ad 02 3b ...
0
votes
1answer
26 views

No “duplicate host” warning if different netmask (same gateway)

I experienced the following "strange" behaviour on a virtual machine network setup (bridged): host 1 hostname: server_one ip: 192.168.1.2 netmask: 255.255.255.0 gateway: ...
0
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0answers
18 views

Why do I have to specify the subnet broadcast address?

When configuring the management IP address of managed Cisco switches, I have to specify the broadcast address of the management network next to their address AND their netmask. Of course this is ...
-1
votes
1answer
221 views

Prevent IPv6 address being exposed when connected to IPv4 only OpenVPN

I have a OpenVPN server which has IPv4 only. I have a OpenVPN client which has IPv6 and IPv4. While connected to the VPN the client is exposed to "IPv6 leak". When client visits IPv6 enabled web ...
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1answer
47 views

Apnic & AFRINIC IP Ranges [closed]

Still having pleny of random attacks from China/Russia at our server. I was wondering if blocking based on this address spaces (link to apnic) is safe ? We are located in Europe and we don't have ...
1
vote
1answer
118 views

How do I forward IPv6 to IPv4?

I am testing a LAN network that will be based on IPv6, but without IPv4 support, i cannot connect to other networks. Can I confirure a router to forward IPv6 requests from local network (LAN) to IPv4 ...
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2answers
48 views

Who is reached by IP multicast?

We have a piece of software here that seems to be phoning home quite a bit. Using wireshark we figured out that it sends quite a few UDP packets each second to 224.168.168.168. Google tells me, this ...
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1answer
67 views

Is there public dns server that serves only ipv4 adresses? [closed]

For debug purposes I need to ensure that all hostnames resolve to ipv4 addresses. So I want to leave in /etc/resolv.conf only one dns server that will serve ipv4 only addresses. But i can't find such ...
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votes
1answer
87 views

Can't Bind IP Address To Machine [closed]

I have the following IPs but I can't bind them to my machine I am getting errors. Here are the IPs I own. 2607:5300:60:1234::/64 - Came with server 158.69.123.123/29 - ...
3
votes
2answers
152 views

End-to-Site VPN from IPv4 -Host to IPV6 (only) - Site

I want my IPv4 only Clients to my IPv6 only Site. I have a dualstack Server which I could use as a gateway. There is a Question somewhat related here: IPv6-only client to IPv6/IPv4 dual stack server ...
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2answers
67 views

Why are 093/8 IP adresses in both US and Europe?

According to this page of the IANA website, the IP addresses 093/8 are allocated to RIPE NCC (European network). However, when I use websites to locate IP (like this one), they tell me that ...
2
votes
0answers
53 views

Is global IP one-to-many communication practical today? [closed]

One-to-many communication over the internet is an enabling technology for many fascinating business and research projects. In principle, IPv4 and IPv6 allow for such communication by the ...
1
vote
2answers
964 views

Should an Azure VM have an Internal IP address of 100.x.x.x not 172.x.x.x or 10.x.x.x?

I have a Windows Azure host that has an internal IP address of 100.x.x.x. I would assume that this is conflicting with external hosts with the same net mask. Is there any assurance that I will not ...
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0answers
37 views

Change Gateway doesn't work on Windows 7

This PC was configured with 192.168.6.1. But I tried to change it to 192.168.6.51. Although route print showed the default gateway is 192.168.6.51, but the packets next hop is 192.168.6.1. IPv4 Route ...
0
votes
1answer
66 views

NetBios issues with multiple adapters, may not be turning on

I'm working in a Windows 2008 server. I'm getting conflicting messages as to weather or not netbios is enabled. The problem is that my AD users can't "discover" the server. I think that netbios is to ...
0
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0answers
110 views

What causes the Linux neighbour table confirmation counter to be reset

Given three linux hosts on the same broadcast domain, the sender constantly pings an IP bound to receiver1. When moving the IP address from receiver1 to receiver2 it takes a quite long time for the ...
10
votes
2answers
1k views

Prefer IPv4 incoming connections over IPv6

We run a social/local service that benefits from geolocating the IP of users. The problem is that with IPv6, geolocation is quite a bit spottier than with IPv4. Is there a way to prefer incoming ...
8
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2answers
1k views

American Users have wrong IP address geolocation

In order to display the right content for my users I get their country based on their IP address. I have been receiving several reports from American users saying that the content is being displayed ...
0
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0answers
86 views

ICMP replies - ingress or egress interface (e.g. from a traceroute)

When a traceroute is initiated and receives an ICMP replies from the nodes, which interface should the be replying from according to RFC 1812. they are actually replying from ingress (where they ...
0
votes
1answer
52 views

IPv6 users see different site than IPv4 users [closed]

I had a site hosted on 1and1 that I moved to an Azure VM. I found that some people who have IPv6 enabled in their routers (not sure if that's the only situation but it's the one that I came across) ...
1
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3answers
126 views

Arvixe claims that my physical host is located in Europe eventhough the whois information

When I look whois of the site it seems like located in US. My site is: www.evdore.com. 1 * * * 2 hos-tr1.juniper1.rz13.hetzner.de 213.239.224.1 de 0.145 ms ...
1
vote
1answer
327 views

nginx won't listen ipv6

I'm running a nginx server (1.8.0) and I want to listen both in ipv4 and ipv6. But even with the right listen statement (and a restart of nginx of course) a netstat -tlp | grep nginx return tcp ...
0
votes
1answer
141 views

netsh command to add interface

I am working with Windows 2012 R2 Core and I having problems with setting up my NICs after they got reset. When I run "netsh int show int" it shows bother Interfaces as Enabled and Connected. ...
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2answers
47 views

Cannot bind to port > 1007?

I want to bind a server to port 1023. If I specify any free port > 1007, I have a "address already in use" error, but it works for ports <= 1007. Working as root on Debian 7.8... Any idea?? ...
1
vote
1answer
177 views

Force use of IPv6 address over IPv4 address

I'm attempting to serve a website from a machine that only has an IPv6 address. I have purchased a domain name and changed the AAAA record of the DNS resource record to my IPv6 address, and have ...
1
vote
2answers
247 views

How do I send network packets from an ipv4 address (with port forwarding) to an ipv6 address (no port forwarding) without STUN?

* I have the following situation: * Bob wants to interact with Alice directly (encrypted interaction, no intermediary server who will forward his packets). Both are behind NAT. Alice has a public ...
0
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0answers
315 views

How do I force IPV4 with PCS? (Pacemaker/Corosync)

I'm setting up a Pacemaker/Corosync cluster with a DRBD mount for a highly available Webapp in a secure environment. This is running on CentOS 7. The cluster is working. However to get this system ...
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0answers
107 views

Direct Access with ipv4 address

I was wondering how an application would behave if it uses only ipv4 address to access an resource on corporate network with Direct Access. Lets consider the client is Windows 8 and DA server is ...
0
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1answer
78 views

Windows translate external IPv6 to localhost IPv4

I have a machine running Windows server 2012, whose external IPv6 address is "2a01:4f8:190:7449::4". Let's assume it has no external IPv4 address, so the v6 address is the only way of accessing it ...
4
votes
3answers
288 views

Make reachable via a fixed address (e.g. IPv6) a server that is actually connected via a variable IPv4 adress?

Need: Internet host at a fixed IP address for full-stack self-hosting People want to perform self-hosting in an area where no ISP provide sufficient service with a fixed IP address. They provide one ...
0
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0answers
16 views

IP Address Subnetting [duplicate]

For my computer networks class, I'm having a hard time understanding how to subnet IP into different networks. Here is a textbook question that I'm having difficulty on: Suppose an organization was ...
0
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1answer
43 views

IPv4 ICMP Codes/Errors for WAN transmissions

Can someone tell me which IPv4 ICMP Codes/Errors i have to unlock as Best Practise for WAN transmission (RedHat und Cisco)?
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1answer
37 views

How can I apply a firewall rule to a specific local IP? [closed]

I host gameservers and as a result have a few IPs. On the main server IP I have the game panel, other IPs are reserved for use by the gameservers I host for my customers. As a result I would like ...