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
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How do proxy providers have such a massive amount of IPs?
I was looking at a proxy provider this evening and it said:
Our IPv4 database consists of over 500,000 IP addresses from all 6 major continents with 50 Mbps to 10 Gbps bandwidth.
I'm just ...
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no outgoing connection via ipv4
I'm experiencing odd behavior on a VPS I own (Debian 8.6) and, honestly, have come to a point where I have no idea how to investigate it further or fix it.
As far as I can see the OS is only able to ...
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Can a network interface assigned to an IPv4 mapped address?
I have some code inherited, which checks on a Linux router for IPv4 network connectivity. There is one check for IPv6 addresses, if they are in the 0:0:0:0:0:ffff:: network. Is it a valid scenario, ...
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Select IP's from two or more subnets
is it possible to retrieve two or more IP's from different subnets over one network interface?
Server has a default IP address of 192.168.178.50/24. Servers network interface eth0 is bridged on br0 ...
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What IPv4 endpoint should I mention?
I am trying to create regular tunnel on https://tunnelbroker.net. Public IP address of our institute is 14.139.196.2. On using this address as IPv4 endpoint address the message
"IP is not ICMP ...
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using ethernet ipv4 as internal bus while allowing the full ipv4 address range for the external interface
We have designed a device to be used as one device, but using ethernet ipv4 inside to communicate with internal not linux-based ipv4-speaking peripherals, juste like what we could do using pci or usb, ...
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IPV6 - private IP not working
I have an apache server with a simple php file echo "hello world!"; and when I try:
http://[127.0.0.1]:8000 working fine
http://[192.168.1.2]:8000 working fine
http://[::]:8000 working fine
http://[...
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Missing lots of ipv4 traffic after dns switch to a new server
I've been migrating a traffic-heavy (https://jsonip.com) service I've run for a number of years to an upgraded server over the last week. Before the dns switch, I was averaging 9mb/s ipv4 inbound. ...
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Nginx not spawning both ipv4 and ipv6 workers
Later edit After a LOT of troubleshooting the actual issue turned out to be a missing semicolon after the server_name directive. nginx -t -c /etc/nginx/nginx.conf wasn't catching it. Double-check for ...
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Linux configuration of net.ipv4.tcp_rmem
I'm trying to create a script with this command:
sysctl -w net.ipv4.tcp_rmem=65536 87380 16777216
However, I get this error:
net.ipv4.tcp_wmem = 65536
error: "65536" must be of the ...
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IPv6 client accessing IPv4 server w/ IPv6-unaware apps via CloudFlare w/ mod_cloudflare
Our server is currently IPv4 only.
However we are using CloudFlare in front of it, and we would like to take advantage of the IPv6 compatibility it offers.
In the same time we have some applications ...
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Why "my IP Address.com" is showing that I've 2 IP address? [closed]
A device is assigned unique and single IP address then why my device has 2?
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Setting a static IP exactly as the dynamic IP yields loss of connection
Before I start I would like to point out that I do not want to get hung up on DNS issues with this question. EVEN IF DNS issues are apparent that would have nothing to do with basic IP traffic and ...
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Two subnets, two DHCP servers. How to stop both DHCP servers from responding to requests from both networks?
I have an environment with two subnets 192.168.1.x/24 and 192.168.2.x/24
Each subnet/network has a Cisco RV082 router as the gateway and a domain controller in each environment that also has a DHCP ...
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Adding an IPv4-only Domain Controller to an existing pool of Domain Controllers with both IPv6 and IPv4
We have an existing pool of Windows 2008 R2 Domain Controllers on-premises. These Domain Controllers have IPv6 and IPv4 configured.
Now we need to add another Domain Controller that will seat on an ...
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Building router with one ethernet interface
Good day!
I have 2 servers in datacenter and I want to use one of them as router for another instead of default gateway provided by DC. Both servers have one ethernet interface called 'eth0' with ...
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Drop fragmented packets in nftables
Using iptables is it possible to block fragmented packets with this rule:
iptables -A INPUT -f -j DROP
But there isn't a equivalent in nftables. There is any way to do it?
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Is an IPv6-only MTA possible yet?
Has anyone had tried to run an IPv6-only SMTP engine?
Pretty much everybody with any sense has IPv6 configured for major front-end servers.
I was curious if anyone had tried to run an IPv6-only MTA ...
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Do NATs rewrite ipAddress in payload of ICMP packets?
Today when I test running a tracert command (windows + Wireshark) I see a outbound ICMP_ECHO_REQUEST packet that has sourceIP as "192.168.1.55" - my local IPAddress.
It is followed by a ...
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How to force Centos to use ipv6 interface only?
My Centos server has two virtual (Openvz) interfaces. One from these interfaces has ipv4 address configured, while the other one has the ipv6 one. In short this server is used for browsing / proxy.
...
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Can't discover a IPv4 link-local address when having an static IP configured
I have link-local addresses working out-of-the-box when coupled with DHCP, since when there's no DHCP, the device doesn't get an IP, only a link-local one. Still, I need to have link-local addresses ...
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HAProxy configuration problems (with source directive)
I have HAProxy setup to listen on a public IPv4 address (1.2.3.4), it is supposed to proxy all requests to my b_http backend. The back-end has a source line that makes it connect to the server/site ...
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Is it possible to configure HAProxy to listen on IPV4, but send the request using IPV6? [closed]
Trying to configure HAProxy to listen for requests on port ipv4(Port 80) but proxy the request through eth1 to a server using ipv6. The request must be show the ipv6 address for the request. We don't ...
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IPv6 DNS Connectivity through IPv6
My clients are using IPv4 in the USA. Their ISP is not ready for IPv6 yet. My public web server is on only IPv6. It is registered with a DNS Provider(GoDaddy) that is IPv4 and IPv6 enabled. Can my ...
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IPv4 assigment strategy in LAN: based on location vs. based on uniqueness of device
In our small office for many years I use IPv4 address assignment scheme based on location of user device, like:
room #1: ip-range #1
room #2: ip-range #3
room #N: ip-range #N
For me it has an ...
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HTTPD listening in IPv6, according netstat, but reacheable in IPv4
Using Openstack, I have a Web GUI (horizon) hosted on my server (HTTPS).
When I do a netstat -lt | grep https, I have:
tcp6 0 0 [::]:https [::]:* LISTEN
...
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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: x.x.x.194 ...
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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 ...
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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 ...
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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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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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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 ...
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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 ...
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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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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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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 ...
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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 ...
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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: 0....
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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 ...
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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 ...
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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 ...
user219962
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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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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 ......Intel(...
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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
...
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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 ...
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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 ...
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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 ...
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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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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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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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