Tagged Questions

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

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2
votes
1answer
148 views

How to find out IP address held by a Windows DHCP client yesterday?

We have a Windows Server 2008 with DHCP server running. I can see the current leases and reservations, is there a way to see the status of yesterday (or at least what IP a particular client had ...
1
vote
1answer
11 views

Ip-in-Ip tunnel not working — Packets not being decapsulated

I am trying to forward packets from HostA to HostB using ip-in-ip tunneling. While packets are reaching their destination, they are not being decapsulated by the receiving host, and thus being dropped ...
0
votes
0answers
9 views

How does a web server return an HTTP request? [migrated]

I'm sorry if this is a really stupid question; my networking knowledge is pretty sparse. So, a user makes a HTTP request to some address. That request comes from an address on a local subnet, but the ...
0
votes
1answer
43 views

What use are systems that ban IP addresses if all the evildoers spoof them anyways

Many anti-spam or web applications with a security component give the ability to ban IP addresses. In my experience any bot, person or other entity that is truly nefarious is using an endless supply ...
5
votes
0answers
52 views

POST of MTU + ~798 bytes gets lost

I have a very weird issue with certain packets not arriving on the destination host. It happens when we transmit a POST that is somewhat larger than the MTU. We can reproduce it with this script: ...
-1
votes
0answers
14 views

2 IPs, need to use one specific IP with Openvpn [closed]

Ask the title suggests, I have a dedicated server (Debian) and I paid for 1 more IP. I wanted to use one specific IP for Openvpn. I'm going crazy trying to figure out how to achieve that. Any help is ...
2
votes
0answers
37 views

How do large SaaS providers support A records? [on hold]

According to RFC 1035 CNAME records cannot be used used in a zone apex because a CNAME record cannot exist alongside records such as SOA. This is frequently a source of frustration for those trying ...
-1
votes
0answers
34 views

Should I have to use internal ip's on my hosted network? [duplicate]

I have 3 servers on a small hosting company. They are on the same network. Lets give them names for simplicity. a.example.com b.example.com c.example.com All are windows server 2008. If I telnet ...
-1
votes
0answers
9 views

Routing based on source ip + anycast bgp

Client A pings ip X > always server 1 Client B pings ip X > always server 2 Random client pings ip X > always nearest server (1 or 2) Anycast DNS Using BGP Tutorial explains the last ...
0
votes
0answers
9 views

Source ip based Anycast-BGP?

I'm just getting interested in networking so don't be too harsh on me :) Ideal: 2 servers with shared ip; ip X Client 1 pings ip X > always server A Client 2 pings ip X > always server B ...
-1
votes
1answer
24 views

Geo distributed ip [duplicate]

When i ping 8.8.8.8 from my home computer (europe) i get around 26 ms latency. When i ping 8.8.8.8 from a server(US) i get around 1 ms latency. When i ping my (US) server from home (europe) i have 130 ...
0
votes
1answer
36 views

Static IP for vpn client on Win 2012 R2

I have Windows Server 2012 R2. I have configured VPN to the server. External clients can connect ok with AD credentials. I am able to assing static IP for specific user like in the picture below (and ...
0
votes
1answer
13 views

How to filter request using IP restrictions OR a filtering rule

We have an IIS site right now that has an allow list for a specific list of IP addresses, and all other IPs denied by default. We want to add another rule, that states that if the request coming in as ...
0
votes
1answer
24 views

Is it possible for a vhost to only listen to the generic ip?

Is it possible for a VirtualHost to listen to the public IP, without having to set it in the file (but by using the environment configuration) : <VirtualHost *:80> ServerName $IP; # If ...
2
votes
0answers
40 views

Non-local IP for next hop in routing

I'm working with an MPLS network and I am slightly confused about some route entries. Interfaces are (these are fake IPs): eth0 10.10.10.1/24 (LAN) eth1 10.9.9.1/24 (MPLS) eht2 2.2.2.2/24 ...
0
votes
1answer
30 views

How do ISPs handle Customer IPs blocked by WebHost

At my ISP, we issue static IP addresses to customers. A lot of times, we get complaints from our users unable to access their websites or emails from their IPs (but same sites and mails are accessible ...
0
votes
2answers
56 views

Is there a way to find which IP I am connected to?

Let's say my eth0 interface has multiple IP addresses and I can connect with SSH to any of these. Is there a way to find out which of those I am connected to? (The background is that certain ...
-2
votes
1answer
17 views

Windows Server 2012 - how do I expose my web site/web server to the global internet? [on hold]

So here's the deal! I've done hosted solutions for a long time (Winhost, etc.) but recently craved the power of being on a VPS and setting up stuff on my own. So ISP gave me a box and I am able to ...
-3
votes
1answer
26 views

I have a IP address with some open services. How could I contact the owner? [closed]

After having serious problems (DNS incident) I found out an IP address of a machine. Is it in any way possible to contact the owner without knowing anything else like email, domain name or website? I ...
0
votes
0answers
5 views

IPv4 and IPv6 from different browsers on same computer [migrated]

On my laptop, in Chrome, when I Google "What is my IP?", I get an IPv6 returned as my public IP address. On the same laptop, in Firefox, I Google the same thing, and get an IPv4 returned as my public ...
0
votes
1answer
25 views

IP Addresses over IPSec

I've got four hosts setup as follows: I've got an IPSec tunnel via OpenSwan over the internet between Servers B and C. Servers A and D are configured to route traffic to the other via B and C ...
-1
votes
1answer
38 views

Whatsmydns shows internal ip for class c whereas for class b it doesnt

I have a VMWare infrastructure and inside that 2 environments named A and B. "A" has its DNS in the server "D" whereas B has its DNS within itself. The scenario is as given below: A has domain ...
2
votes
2answers
128 views

How to make sure clients use only the IP assigned via DHCP

We want to limit the users Internet usage on a daily traffic basis but not the local network bandwidth. Our users are on different platforms (Windows, Android, IOS), therefore it is not possible to ...
0
votes
1answer
50 views

Why are only 3 ip xfrm policies needed for a IPsec tunnel?

I have a site-to-site IPsec tunnel up and running between a strongswan (v5.2.0) instance (site A) and a RouterOS router (site B). Everything works fine, the hosts in the two private subnets setup for ...
0
votes
0answers
43 views

flushed IPs - cannot acces to my server

Edit: If think that there is no problem with IP. However, there is something very strange. Indeed, I've no logs at all. The latest logs was when I restarted my server after removing IPs. OS: Debian ...
0
votes
1answer
28 views

Ubuntu, iSCSI LIO listen on any IPv4

I've installed targetcli from repo on my Ubuntu 14.04 server. I'm trying to figure out how to make the service listen on any (0.0.0.0) address. Trying to setup 0.0.0.0 specific gives me an error: IP ...
-1
votes
0answers
33 views

Powershell iterate over IP Range [migrated]

I would like to iterate over my IPv4 range with Powershell. For example my IP is 192.168.0.0 and my mask is /20. Therefore my usable range goes from 192.168.0.1 - 192.168.15.254. Net-ID is ...
0
votes
1answer
38 views

IPv6 configuration - cannot ping

I am trying to configure IPv6 network first time in my live. I have got on my main server following interfaces: br1 Link encap:Ethernet HWaddr 66:ea:5c:99:08:f5 inet addr:192.168.0.1 ...
-1
votes
0answers
22 views

Sonicwall + BT Infinity VDSL: how to use routed static public IP addresses [duplicate]

I have a UK BT Infinity VDSL2 connection. The ISP provide a modem, I dial a PPPOE connection over that modem from the sonicwall. The sonicwall receives a dynamic public IP address, and then my ...
-1
votes
2answers
34 views

Finding IP Of Remote Host Machine By IP Of Guest Machine

I am trying to find a way to figure out on which of the servers the virtual machine actually is residing. I know the ip of the virtual machine. It is in a bridged mode on the local network inside one ...
0
votes
1answer
29 views

how to redirect IP to a Server based on his geographical location [closed]

I have to servers : 10.10.10.10 and 10.10.10.11 both has the same domain name mydomin.com the idea is to to redirect for example visitors from Europe to 10.10.10.10 but visitors from US should ...
0
votes
2answers
50 views

sonicwall-multiple IP's for same interface

I am new to sonicwall.Is there any way to add multiple ip's to a sonicwall interface ?. In my lab there are two local networks connected to same switch (networks are overlapped). I need to communicate ...
1
vote
1answer
35 views

why i see two kind of IP at my ping?

i have a Windows Server 2008 R2 with external DNS Server on it. all domains works fine but when i ping one of theme i get this result and site is down . C:\Users\Administrator>ping xxx.com ...
-2
votes
1answer
38 views

Is there any rate limit when using the whois command on ips? [closed]

The data returned by whois ip-address appears to be very useful and more accurate than the data I get from the maxmind geoip databsae I am currently using. Where does the data come from and are there ...
0
votes
1answer
43 views

Static routing on CentOS through managed switch

I am a newbie in networking and I have a question regarding static routing through managed switch. I have a cluster which are connected to a managed switch. One of the node(call it head node) also ...
0
votes
0answers
17 views

Nginx - Mediawiki - Limit access to the connexion page to specified ip

I would like to limit the possibility to connect to my Mediawiki web site to a specified list of ip. The url to connect are : /index.php/Spécial:Connexion /index.php?title=Spécial:Connexion ...
0
votes
0answers
45 views

AWS Instance Suddenly Not Available in Browser - SSH and ping work

I am very new AWS and sys admin so bear with me... I noticed my website was suddenly down today and have been working to sniff out the issue. No site files were changed as far as I am aware. Here is ...
0
votes
0answers
10 views

How do I apply IP filters by domain on a multi-domain website in IIS 6?

I'm running one install of Kentico, a .NET content management system, running on IIS 6. One install is able to manage multiple websites. Within IIS, multiple domain names are pointed at the same ...
10
votes
1answer
217 views

Under what circumstances is TCP-over-TCP performing significantly worse than TCP alone (2014)?

Many admins keep perpetuating - on ServerFault and elsewhere - how bad of an idea TCP-over-TCP is, e.g. in VPNs. That even the slightest packet loss will make one suffer from at least severe ...
0
votes
0answers
35 views

Cisco 2901 Inbound NAT with local IP overload

Overview We are replacing a Juniper SSG on one of our networks with a Cisco 2901. Everything has so far been quite smooth except some issues have come up with external ports needing to be opened. ...
0
votes
1answer
33 views

Does the IP -> Ethernet multicast address mapping ambiguity matter for IGMP snooping switches?

There are 2^28 possible IP multicast addresses, but only 2^23 possible Ethernet (MAC) multicast addresses (http://technet.microsoft.com/en-us/library/cc957928.aspx), which is why e.g. 224.1.1.1 gets ...
0
votes
2answers
60 views

Reverse proxy on ALL ports, not just http?

Hello I recently asked a question about running multiple websites on different servers on the same network here multiple servers running the same thing, how? I have researched about setting up a ...
-5
votes
1answer
44 views

multiple servers running the same thing, how? [closed]

I have a little issue that I don't understand well enough to answer myself. Basically I have some servers on my home network, I am wondering how 2 servers could run something, lets say apache in this ...
-4
votes
1answer
46 views

Do anycast addresses imply IPv6? [closed]

From what I understand, as a random user on the Internet, you cannot really know if an IPv4 address is unicast or anycast. However if you ping that IPv4 from two hosts physically located on two ...
2
votes
1answer
142 views

OpenVPN: How to mitigate path MTU issues on a per-client basis?

We have dozens of embedded devices installed at customers, all calling home to our OpenVPN service. That works fine in general, but a few of our customers have severe path MTU issues. Our influence on ...
0
votes
1answer
48 views

blocking ip on linux(CENTOS) [closed]

I m blocking an ip from my centos server using iptables: iptables -A INPUT -s $ip -j DROP service iptables save however my ip is still able to access the ip and even view websites hosted on this ...
1
vote
1answer
187 views

Is it possible to configure a reverse VPN tunnel?

Basically, my goal is to have a 100% portable and independent server. I'm building it using a Raspberry Pi powered by solar panels and batteries, and it is to be connected to the internet using a 4g ...
-2
votes
2answers
67 views

Should my DNS server and DHCP server have the same IP address? [closed]

trying to resolve a 'Server not Found' error message. If I reload the page a few times it works.. So I went to the Event Viewer and saw my DNS timed out, went to CMD did the ol' ipconfig /all to see ...
1
vote
2answers
54 views

Difference Between Netstat and Access Log

When I was checking stats in SSH terminal for my VPS, I noticed that netstat and access log gives different results. When I used: netstat -anp I saw that one attacker having 32 concurrent ...
0
votes
1answer
47 views

Detect IP blocking or blacklisting

Unable to access a cloud server (Windows) from a particular public IP provided by the ISP. Tried to PING, tracert, telnet everything, nothing worked. No deny rule mentioned in the firewall. Properly ...