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Questions tagged [ipv4]

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

The IP address of a device is its unique identifier on a network which allows communication with that device.

Given the fact that only 2^32 IPs are available, number which is already depleted, its successor (IPv6) has officially taken over on 6 June 2012.

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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: 192.168.1.1 host 2 hostname: server_one ip: 192.168.1.3 netmask:…
il_maniscalco
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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 always the last address of the subnet. Why do I have…
bot47
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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 sites, the Internet traffic does not go through the…
user2489483
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Apnic & AFRINIC IP Ranges

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 any interest what so ever in visitors from…
Martijn
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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 is a reserved multicast IP. Can I somehow find out…
Dakkaron
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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…
Ray
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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 blame. look at this screen shot. obviously, I…
wlraider70
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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 ARP/neighbour cache to be invalidated on…
Michael Renner
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IPv6 users see different site than IPv4 users

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) are being sent to the site that was on 1and1. The…
Jane
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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?? Thanks in advance
greg
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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 ready for a security audit, I must disable all…
Routhinator
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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 from outside. But I have services running which are…
hammereditor
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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)?
Andi
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IP Address reassignation (unused Ip address)

Available IPv4 address blocks are exhausted and price per IPv4 address is increasing. However I read that 2/3 of IP address remains unused because they were assigned improperly at first stages. Since looots of these assigned IP address are unused.…
NeDark
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How to set up a Linux gateway for multiple WAN networks?

I have a network with the following IPv4 and IPv6 addresses: eth0 Link encap:Ethernet Hardware Adresse 30:85:a9:42:3e:60 inet Adresse:109.2xx.239.145 Bcast:109.2xx.239.255 Maske:255.255.255.0 inet6-Adresse: 2a02:d40:xx:xx::6/64…
SmileMZ
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