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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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RIPE IPv4 Block with google cloud computing engine

I was wondering if there is a way to use the RIPE IPv4 address block owned by us on google cloud? We want the main external IP from the cloud computing to be ours and not one given by Google. Thanks for the answers in advance Regards D.
David Eisenmann
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IPv4 identification field manipulation in linux

When Don't Fragment flag is set, IPv4 RFC allows set Identification filed to 0x0000. I got a peer which is behind firewall that brakes RFC and block any IPv4 packets with such 0x0000 ID field. My "modern" 4.4.0 linux kernel generates packets with ID…
luzik
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Mikrotik port forwarding - no access to server

I need your help concerning port forwarding with Mikrotik's RouterOS! I have executed this command : /ip firewall nat add action=dst-nat chain=dstnat comment="Owncloud in NAT" dst-port=8079 in-interface=ether1 protocol=tcp to-addresses=172.16.0.50…
Jeff Labonté
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postfix still using ipv6 even if inet_protocols=ipv4

I have set this in /etc/postfix/main.cf: inet_protocols=ipv4 #I also tried with smtp_address_preference=ipv4 But still, the received message in Gmail shows an IPV6 address next to SPF. Why?
Basj
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drbd with IPv4 fallback

I was setting up DRBD over IPv6, I want to ask if it is possible to provide both IPv4 and IPv6 addresses in address section like below. on server1 { disk /dev/sdb1; address 140.X.X.X:7788; address ipv6…
Prabin Dahal
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Block Clients based on RTT

I am running an application on my Debian server, which uses IPv4 and UDP for data communication. I would like to block every client for a short while, that has a Round Trip Time above 140ms. Unfortunately i am not able to implement such a rule…
robusto
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Access IPv6 server behind router with IPv4

An IPv4 client in Germany should access an IPv6 server in the USA. This server is in a private home with a common home-router. If it was an IPv4 server, I would just configure NAT and port forwarding to access the server, but in this case I also…
schube
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Unable to communicate over vpn after enabling IPv6 on tunnel for IPv4 or IPv6

I'm trying to enable IPv6 on my OpenVPN tunnels, but when I follow https://community.openvpn.net/openvpn/wiki/IPv6 and add openvpn --version OpenVPN 2.4.0 mipsel-unknown-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [MH/PKTINFO] [AEAD] built on Feb …
Jacob Evans
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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, that an interface can have an IPv6 address in this…
Rudi
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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 together with some ve* interfaces from virtual…
J. Pee
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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 pingable. Please make sure ICMP is not blocked. If you…
Shridhar R Kulkarni
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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, for example. Now comes the problem that the…
Philippe De Muyter
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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 that's what this question is about. I was…
Arvo Bowen
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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 ICMP_TTL_EXCEEDED packet sent from an internet wild host as…
vantrung -cuncon
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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 working even if I'm setting up interfaces…
oblitum
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