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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1
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2answers
33 views

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 ...
0
votes
0answers
15 views

Script Not working. Need it to work on default route adapter to change the subnet mask only

Need a script that can be run on Windows 7 machines. Script would need to get the default route LAN adapter settings. Set the IP and Gateway to whatever they were set to and change the subnet mask ...
0
votes
1answer
24 views

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 ...
0
votes
1answer
25 views

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 ...
-2
votes
1answer
28 views

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? http://i.stack.imgur.com/V1X1E.jpg
1
vote
3answers
75 views

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 ...
0
votes
1answer
40 views

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 ...
2
votes
1answer
23 views

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 ...
0
votes
0answers
16 views

Can't connect to virsh managed QEMU-KVM via network interface

trying to connect via SSH to VM on Debian 8.4 Host. Seems the virtual ethernet adapter don't get an IP4 by DHCP. Can smb. point me in the right direction :( Some cfg. details... #ifconfig eth0 ...
-1
votes
1answer
61 views

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 ...
0
votes
0answers
97 views

IPv4/IPv6 dualstack setup in Debian/Ubuntu via preseed

I use preseed to provision my Ubuntu 16.04 installation. It has the following options to set up IPv4 or IPv6 address # Static network configuration. # # IPv4 example #d-i netcfg/get_ipaddress string ...
1
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0answers
58 views

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?
17
votes
2answers
1k views

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 ...
0
votes
0answers
80 views

IPv4 over IPv6 IPsec tunnel

I've got two Cisco 2811 routers, both with a global static IPv6 adress, and an IPsec tunnel between them (using VTIs). Is it possible to send IPv4 traffic over this tunnel? The relevant parts of the ...
1
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2answers
52 views

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 ...
0
votes
1answer
53 views

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. ...
0
votes
1answer
73 views

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 ...
0
votes
0answers
75 views

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 ...
2
votes
0answers
80 views

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 ...
0
votes
2answers
44 views

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 ...
0
votes
2answers
32 views

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 ...
1
vote
1answer
140 views

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 ...
0
votes
0answers
23 views

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....
7
votes
5answers
392 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 ...
3
votes
1answer
38 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
65 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 ...
0
votes
0answers
45 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: &...
2
votes
0answers
76 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
votes
0answers
106 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
25 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 ...
-1
votes
1answer
69 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 ...
1
vote
2answers
131 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
161 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
63 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: 0....
-1
votes
1answer
32 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
99 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
214 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
vote
1answer
76 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 ...
0
votes
0answers
94 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 ......Intel(...
0
votes
1answer
33 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: 192....
0
votes
0answers
24 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
339 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 ...
-1
votes
1answer
58 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 ...
2
votes
1answer
300 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 ...
0
votes
2answers
57 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 ...
-3
votes
1answer
104 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 ...
-2
votes
1answer
105 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
190 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 ...
1
vote
2answers
68 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 93.184....
2
votes
0answers
55 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 ...