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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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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 single IPv4 address. For the services of which I run…
0xC0000022L
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OMSA only work for IPv6?

I have installed OMSA on a server and the dsm_om_connsv service is running. I have found, in the past, this always binds to an IPv6 socket only; # netstat -lnp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address …
jwbensley
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Blocking all RIPE Addresses in Server 2008?

Our datacenter has recommended we block all RIPE IP Addresses on one of our machines. It is constantly being DDoS Attacked everytime the null routes are lifted, so I am not sure how this would help, but am more than willing to try anything now. I…
Aidan Knight
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Traceroute doesn't reach gateway

I have problem with my openSUSE 11.3 network. So, I've assigned IP address 192.168.137.2 to it, and another computer (Windows 7) with IP address 192.168.137.1. On the openSUSE, the gateway is the 192.168.137.1. and the ping result is ping…
Lee
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Am I supposed to assign the broadcast IP somewhere?

This is a very basic question from a newbie point of view. I have a dedicated server at Hetzner running Windows 2008 R2. I bought a subnet of IP addresses to use in this server. They provided me a given range of IPs, incluind one Ip labeled as…
pvieira
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IPv6 fallback to IPv4

Currently I am connected to Internet over IPv4, I am using tunnel from sixxs.net and I have got subnet and one of IPv6 assigned to my eth0 interface. So, eth0 has IPv4 and IPv6: 2: eth0: mtu 1500 qdisc pfifo_fast…
Ency
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Is it possible to disable ARP in Windows 7

I have a unique requirement where I need to disable ARP on a Windows 7 box. In previous Windows versions you could modify the ArpRetryCount in the registry (and set it to 0), but this does not work in 7 (nor does it exist). Does anybody know how, or…
DriverGuy
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IPv4 Client <-> IPv6 Server - Tunnel from client to server to use IPv6

I have a Debian server with a IPv6 Tunnel (from sixxs) and an IPv4 Ubuntu Client. Now i want to make a tunnel from the client to the server, so that i can surf with IPv6 from the client. Is there a simple solution or should i request another tunnel…
fwaechter
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Should I worry about my static IPs?

We currently have a range of 12 static IP addresses through our ISP that I believe are leased. Now that the IPv4 space is almost gone, should I be worried that our ISP (it's a Time Warner fiber connection) will want to pull these back or in some…
Joel Coel
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Empty IPv6 address causes DNS error on Macs running Apache Server

For a site I manage, http://archstl.org/, the DNS entry returns an empty (::) IPv6 address when I run $ host archstl.org in the Terminal. I think the errant IPv6 entry may be the cause of my problem: when a Mac user running Apache Web Server (any…
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Simple road warrior IPv4 VPN configuration in Cisco IOS

I'm looking to setup a reasonably simple road warrior VPN configuration on our Cisco routers. Frustratingly, I've been searching for this but cannot find a simple complete guide. Multiple (not necessarily many) remote users IPSec / ISAKMP…
MikeyB
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squid: Unable to allow 10.10.11.0/24 but 10.10.11.0/23 works

Im unable to make a working acl with CIDR over `/23` (squid 5.7 on Debian) For example i got this config (working): acl servers src 10.10.11.0/23 http_access allow servers ... http_access deny all Now i change /23 to /24 and my client on…
mylan
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Why will Firefox resolve my domain but Chrome will not

I've been setting up a LAN DNS server using DNSMasq to forward my webserver which at the moment has https and is port-forwarded by my router. I have a domain registered which resolves fine from outside my LAN and I've been addressing a NAT loopback…
Adam M.
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How to fix, ubuntu not getting ip address on hyper-v?

I am using hyper-v as a hypervisor and installed ubuntu 21 on it. There, whenever I start the VM, the eth0 (only one network interface connected,Default Switch of Hyper-v) is not getting IP and showing as down. Please bare with my snaps, as I…
Sara June
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All Outbound Traffic Uses IPV6

I have a Debian 10 server which has postfix installed, each time I try to send outbound mail traffic, the server uses IPV6 over IPV4. This causes postfix to log Connection timed out. I have tried sending packets to google SMTP server using telnet,…
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