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Questions tagged [ip]

IP - Internet Protocol, the most commonly-used set of rules for dispatching data across a large computer network.

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IP phones get DHCP NAK from superscope configured DHCP server

We are experiencing a strange problem with our 2012R2 DHCP server. Setup looks like this: Superscope with two scopes: SCOPE 1 - 192.168.100.0/24 (for PC) SCOPE 2 - 192.168.101.0/24 (for IP phones) No ...
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14 views

how to set outbound traffic for floating ip linux

I am using Heztner server for running my application, which owns IP as 95.216.167.191. Then I added a floating Ip which was 159.69.100.75. my network interface looks like that # interfaces(5) file ...
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0answers
25 views

Am I being hacked? [closed]

I hope I can find some answers here and will try my hardest to make sense since I am not very familiar with all of this. I've been having an ongoing problem with what i believe is hacking since ...
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0answers
31 views

Windows is listening on addresses never assigned

I have a Windows 2016 server used for development. Thus I have quite a lot of virtual switches and multiple addresses assigned to physical and logical network interfaces. But now I am encountering the ...
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0answers
24 views

difference between ip -s and ethtool -S?

I see inconsistent drop counts on an Intel X710 NIC between ethtool and ip - ethtool reports no drops, but ip -s and /proc/net/dev disagree. How do the tools differ in the way they account for drops? ...
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3 views

Using Fritz!Box 3490 to forward external traffic to internal servers [migrated]

I have a Fritz!Box 3490 along with 5 usable external IPv4 addresses provided by our ISP. The Fritz!Box is to replace our existing DrayTek 2925. One of five IP addresses is an MX; so we use that IP to ...
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0answers
12 views

how to only allow access to website if user access through a certain website in IIS

How can I deny access for everyone except users that originally access the site from a specific website? I use IIS 10. Does really IP/Domain filtering in IIS works for this? I tried to simulate this ...
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1answer
40 views

What private ip address space to use for a self-host VPN? [duplicate]

I have set up a private OpenVPN tunnel which uses the a 10.x.x.x private ip range as the client and server ip. I was wondering if that would cause any problem in big networks that use that ip range ...
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3answers
61 views

What significance does the subnet mask have for a public IP address? [closed]

Our hoster has assigned us multiple public IP addresses. They are individual non-contiguous addresses e.g. 1.1.1.50 and 1.1.1.222. According to them the correct subnet mask to use is 255.255.255.0. I ...
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2answers
147 views

Why do people use 172.x.x.x instead of 192.x.x.x [closed]

Since I was a kid, I've always installed our home network with the default 192.168.1.x/24, but whenever i log into my university's network, i notice that they use 172.x.x.x, and the same thing goes ...
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0answers
14 views

Reason for double addresses on single computer [migrated]

I am on the west coast and I am using Sonic fiber internet (sonic.com). The modem provided by the ISP is Pace modem. I am running Ubuntu. In the modem configuration, I saw that my public IP is 198.xx....
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2answers
102 views

How to Get IP Addresses of User In Active Directory Domain

I am trying to find IP address(es) of active directory user. If a user is logged in into multiple computers then I need to find all IP address(es) of those machines. I have tried to get the computer ...
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1answer
41 views

How to get an DHCP allocated IP address without a reboot?

I have a server which currently staticly addressed with an entry in its /etc/hosts file, e.g.: 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost ...
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0answers
27 views

What is the difference between net.core.netdev_max_backlog and net.ipv4.tcp_max_syn_backlog

Several docs on the net describe these options as following: net.core.netdev_max_backlog: Maximum number of packets, queued on the INPUT side, when the interface receives packets faster than ...
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2answers
47 views

Display only the network interfaces which has the ip address using ip command

I use ip a to get the IP address of my machine. Sometimes, it is getting difficult to identify when I have 20+ network interfaces. Is there a way to display only network interfaces which has IP? The ...
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0answers
16 views

How can you prevent X-Forwarded-For spoofing on haproxy? [duplicate]

Is there a way to prevent the X-Forwarded-For from being spoofed in haproxy? i.e. Can I rename that header to something else? Or is there another way to forward on the correct IP address of the ...
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1answer
29 views

Squid 4.2 - Different outbound IP for each client/user

I have been playing with a few different pieces of forward proxy software, primarily CCProxy and Squid Proxy/Cache. What I have is a dedicated server with a single NIC with multiple IPs assigned to it....
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2answers
33 views

Best way to secure a SQL VM when clients do not have static IPs

I have a VM running SQL in the cloud. Typically I would set up inbound rules on the SQL ports in Azure and on the VM's firewall, but my clients do not have static IP addresses to use in the rules. ...
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0answers
9 views

Upgraded from trial, no IPs pinging, need backup (novice)

I was using the GCP year-long trial to host a few fairly simple WordPress blogs, and wasn't able to upgrade before my trial ran out. I upgraded after the fact and expected my hosting to continue as ...
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1answer
36 views

How to get the IP address of a known hostname in Linux?

I have a device in a public network (I'm not the owner/admin of the WiFi) and I want to know if there is a way to get the devices IP address by knowing its hostname from a second device in the same ...
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0answers
60 views

ip blocked by ufw but still can access my server and make request

i have ubuntu 16.0.4 server with apache and node.js installed , recently i noticed that i have many request from certain ip so i tried to block it using ufw with the following output: Status: active ...
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1answer
47 views

Allow access to site only by domain name [duplicate]

I have a site that uses an AWS Application load balancer, this load balancer has two dynamic public IPs. Behind the load balancer are a few EC2 instances that server a ruby on rails site using Apache ...
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1answer
43 views

Can't ping 253.100.156.93 from Linux

At a remote location, there is a chinese ethernet enabled POS printer. It somehow garbled it's configuration, and its self-test now says that its IP address is 253.100.156.93, (which is inside a IANA ...
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0answers
27 views

hosting the MAMP apache server over my local network is not working

I have a php website that I am developing in MAMP PRO 5.0.4 running on the apache server. I have created a virtual host with a name similar to example.social and SSL enabled using a self signed ...
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1answer
66 views

Using iptables TPROXY instead of REDIRECT

I'm running Debian 8. I'm trying to intercept all packets, and are currently using iptables for this: iptables -t nat -A PREROUTING -p tcp -j REDIRECT --to-port 5000 This seems to work, but it ...
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0answers
83 views

Logstash losing connection to Elasticsearch nodes

We're running Logstash on a server which is pushing logs into an Elasticsearch cluster. In the Logstash logs we see it losing connection to the Elasticsearch servers with a connection reset error. We ...
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0answers
40 views

Add printers to cloud print by ip address

I am trying to add all the printers in my school to Google Cloud Print so students with chromebooks can print to them. The printers are on the network by ip address, with addresses like room1.printer....
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1answer
74 views

Get IPv6 route for VM

is there any option to get something like this for IPv6 (inet6 or -6): ip route get 8.8.8.8 Result: 8.8.8.8 via 94.**.***.1 dev ens3 src 94.**.**.112 uid 0 cache Where I can get the local IPv6 ...
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0answers
43 views

How to specify outbound IP when running Teamspeak 3 server within a Docker container?

I have a Teamspeak 3 server Docker container on my server. My server has several IPs assigned to the one interface eth0. 198.51.100.17 Main IP 198.51.100.18 Second additional IP 198.51.100.19 ...
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1answer
45 views

how can I know since when has a BGP prefix been allocated?

I am a bit confused. I would like to know since when a current ASN (and its corresponding prefixes) have been in place. When I look at the example at team-cymru (http://www.team-cymru.com/IP-ASN-...
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1answer
17 views

What is the command to know IP that accessing our server with Iptables

May I know what is the command that I should use to get the output of all IP & its frequent while they are accessing my server? I need this command to know the frequency of IP that access my ...
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1answer
65 views

How to run a program in the context of a VRF in Linux

I have created a VRF and I have added interfaces and routes to my VRF. My VRF is as shown below. My VRF is names wan1: [root@host ~]# ip route list vrf wan1 default via 12.12.12.12 dev enp1s0.4025 ...
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1answer
53 views

IP Routing Issues OpenVpn

I have two servers in the same datacentre, running Ubuntu 16 Server A: 10.12.96.5 Server B: 10.12.96.4 Server A, is running OPENVPN Server. When I connect to server A using SSH, I can PING server B....
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1answer
90 views

Ubuntu defaults to IPv6, should default to IPv4

Ubuntu 16.04.5 with kernel 4.4 used to work as intended: IPv4 is default. Since changing to kernel (hwe) 4.15, it uses IPv6 as default. It has IPv6 available via Tunnelbroker, broadcasted by the ...
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50 views

Is the Inside Global IP address the same as the Public IP Address? [NAT TABLES, Public IP, Private IP, Inside Global Address]

Is the Inside Global IP address the same as the Public IP address? Private IP addresses assigned to each device are translated using NAT to a Public address. Is that public address the same as the ...
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1answer
151 views

How to check IP range in nginx location?

I have nginx.conf and need to check the client request IP $remote_addr in IPs range or not? My IP range means 123.132.123.15 to 123.132.123.50 (15 - 50). And valid IPs need include some specific IPs. ...
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1answer
40 views

What is NAT port of an IP address?

I received a request from police to provide all available data of one of the users of my dating website. So, I sent them IP address, connection times, email address. Then I got another email with a ...
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1answer
41 views

Adding specific route to my IP camera through eth0 wont work, but adding a range will [closed]

I have an IP camera configured to always use the IP 192.168.1.37 connected through ethernet to my raspberry pi. I'm also connected to the raspberry pi, through wifi. If I do: pi@raspberrypi:~ $ sudo ...
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1answer
42 views

How a dynamic dns provider update my IP for the subdomain he gave me? [closed]

No-ip and dyndns, for example, give me a subdomain which will point to my latest IP address. However, how do they update the IP for this subdomain? One method would be to ask the registar for this ...
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1answer
432 views

DNS CNAME Resolution - which IP would be returned?

I saw this example of a CNAME record, but I don‘t know what IP would be returned and couldn‘t find an answer. I‘m looking for the IP of pc2.an.example.com and the mail server of an.example.com Zone ...
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3answers
112 views

My web hosting provider is providing 4 nameservers, which do I use to to point my domain?

I host my domain at GoDaddy, and purchased hosting from another website. The new website I'm using for hosting is providing 4 nameservers, while in GoDaddy it only provides 2 text fields to enter ...
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1answer
32 views

can I still map an IP address to its ASN number when the last octet is masked?

I have a database of IP addresses whose last octet has been masked IpAnonymizer.mask_ip("8.8.4.4") # => "8.8.4.0" Can I still use map these IPs to their respective Autonomous Numbers or the ...
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0answers
36 views

How to connect two different networks hosted on 2 different NICs

I have a Windows 2012 R2 server which has 4 NICs. Two of these NICs are connected to seperate private networks(not connected to internet). NIC3 is connected to 192.168.137.1 (Subnet mask: 255.255.255....
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0answers
112 views

IP Address and Subnet Address Validation

I am developing a code to validate that an IP and Subnet IP combination is a valid one. Say the IP address is 192.179.10.105 and its subnet mask is 255.255.0.0 - so what are the validations we can ...
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2answers
113 views

How does MS know which public IP addresses are dynamically assigned [duplicate]

I came across this article which says that Microsoft is blocking SMTP from dynamically allocated public IP addresses. https://support.microsoft.com/en-us/help/886692/microsoft-com-now-blocks-...
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2answers
69 views

How to access host in LAN using alternate IP address?

I have a server in LAN (192.168.1.0/24) with static IP address 192.168.1.100, now I would like all service on this server to be accessible using 192.168.100.100 for hosts in the same LAN(192.168.1.0/...
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0answers
22 views

Create a VPN across diffrent public networks

I have a bunch of 10 iDrac servers, distributed globally across different datacenters with public IPs. There are no firewalls for these servers. How can I bring them into a single network, so that all ...
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1answer
35 views

windows 10 ip route not working for modem usb 3G

i have 2 interfaces: 1 .- Cable ethernet 2 .- USB modem 3G, The problem is i cannot work with both at same time, routing seems not to be working for me... I cannot nake this work: 0.0.0.0 ...
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1answer
26 views

Link Local Addressing - Communication with Routable Addresses

As per RFC 3927 it states that There will be cases when devices with a configured Link-Local address will need to communicate with a device with a routable address configured on the same physical ...
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1answer
34 views

how to identify the organization behind a given IP address?

I have a large dataframe as follows (fake data below): ip 192.168.1.1 192.168.1.2 192.168.1.3 192.168.1.4 192.168.1.5 Given the large quantity of ip adresses in my data, I would like to merge ...