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

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2answers
1k views

SBS 2008 DNS issues in BPA

I'm gettng constant Critical Issue events in the Small Business Server Best Practices Analyser & resulting SBS Console reports that begin "The DNS client is not configured to point only to the ...
-1
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0answers
25 views

DHCP offer is unicast at both L2 and L3; how?

Recently I observed The DHCP Offer by the server is unicasted as requested by client in DHCP discover Broadcast flag. In the wireshark capture,the offerpacket had L2(Dest-Mac) and L3(Dest-IP ) ...
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0answers
15 views

Windows IP address cached even after cable unplugged? [migrated]

I have a PC which connects to a network by both wired cable and wireless. Of course, it has 2 IP Addresses : 192.168.5.111 and 192.168.5.112. (Subnet mask 255.255.255.0) As usual, the PC picks the ...
0
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2answers
14 views

Load balancing IPTABLES POSTROUTING rules

I have an interface with 5 IP addresses assigned to it (as virtual adapters) let's call them x1,x2,x3,x4 and x5. Currently I have SNAT POSTROUTING forwarding rules from local source range to specific ...
0
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1answer
799 views

Free DNS redirect for non-static IP with purchased domain?

I purchased a domain name from GoDaddy, and I'm wondering if there is a free way to create a DNS redirect to my home apache2 server (Ubuntu). I don't have a business line, so I technically don't have ...
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1answer
10 views

plesk - Loopback HTTP connections go to incorrect vhost

Running plesk 12 and noticed the default vhost log ( /var/log/httpd/access_log ) is full of these 404 errors: [25/Nov/2014:22:17:40 -0500] "POST ...
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0answers
16 views

iptables NATed traffic is not getting ack back

Ok, I'm trying to setup the classic iptables DNAT/SNAT scenario (RHEL 6.5, 2.6.32-431.17.1.el6.ppc64 kernel ): *Host A 172.16.0.0/24 nets Host B 172.16.0.0/24 + 192.168.0.0/24 nets Host C ...
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1answer
35 views

IP Network Best Practice [on hold]

On my On Premise network we use IP Span 172.17.101.0-172.17.103.254 I should now connect our Windows Azure network to the On Premise network using VPN. Is it okay to use IP Span 172.16.1.0 in the ...
1
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1answer
2k views

ping works but ssh fails

machine1 IP: 172.30.11.119 machine2 IP: 172.30.11.120 machine3 IP: 172.30.11.121 machine4 IP: 172.30.11.122 Note: These machines are connected to LAN. I have configured the static ...
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0answers
23 views

Double IP forwarding not working

I have the following 2 debian servers in my scenario: The first one is my main openvpn server, it has 2 NICS active eth0 (172.25.156.146) and eth3 (172.26.16.1) - The second server has also 2 NICS ...
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0answers
18 views

windows server 2012 ping resolves every time 169.254 [on hold]

i have a static 192.168.1.254/24 on my windows server 2012, it's a domain controller and is a A-host DNS server_a 192.168.1.254, when i ping to server_a every time resolves 169.254.222.88 but when i ...
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0answers
20 views

Monitor traffic with endpoints [on hold]

I want to monitor traffic on my linux machine with metadata (remote IP, port) like ntop does, but a bit more like webalizer or cacti over time. vnstat does not provide connection metadata, but ...
0
votes
2answers
14 views

IIS Website access by both hostname and IP address?

If I set up a website in IIS with a hostname (local.somewebsite.com) (having added it to HOSTS file) and also specify an IP address (127.0.0.1), the website is accessible by the hostname, but hitting ...
3
votes
4answers
757 views

Resolving IP address conflicts on a LAN

We have our LAN set up with DHCPD providing fixed IP addresses to the systems. However we are facing IP address conflicts if some one connects a laptop and assigns an IP address belonging to another ...
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votes
1answer
34 views

force use of specific ip when talking to specific host

I have a server with multiple interface alias running debian. lets say eth0 eth0:0 and eth0:1 I'm looking for a simple solution, when connecting to host 1.2.3.4 (or host range, would be better) that ...
0
votes
2answers
50 views

CentOS, How to allow SSH through only one server-ip [closed]

I currently have a dedicated server with two pv4 IP addresses assigned to it. I want to make one public, and the other private for SSH/FTP related material. IP 1 (The public ip): 192.23.6.11 IP 2 ...
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0answers
14 views

Change vlan settings to Yealink phones at once

I have about 90 yealink ip phones. My target is to change vlan settings to all of them massively. For example, when it's going to reboot all of them, I run the following ...
5
votes
4answers
2k views

Openvpn, forward packets very slowly

I rebooted my server, and an odd issue just came out. I am running on ArchLinux, the clients are Ubuntu, Android and Mac. The problem is that accessing the internet via the clients is slow, about ...
0
votes
1answer
58 views

How does an IP address goes down from an Application Layer to IP Layer? [closed]

Using the classical TCP/IP layers model, I am thinking about an application (for example a browser) acting as a client wanting to talk with a server (e.g. a web server). Of course it has to use the ...
3
votes
8answers
2k views

Block spam by using geoip filter?

We are looking for a way to be able to block spam based on geographic location by filtering using geoip. context: we rarely have any email correspondence outside of the USA, so we would like to block ...
1
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1answer
44 views

Linux VPS settings to allow $_SERVER['REMOTE_ADDR'] to get client ip [closed]

I have unmanaged VPS server. I am trying to get client IP form PHP $_SERVER['REMOTE_ADDR'] but it's always gives me same for all users that is server internal IP. I have done some R & D and got ...
0
votes
1answer
830 views

understanding “ip addr change” and “ip addr replace” commands

At the moment I have following IPv4 addresses associated with eth0 interface: T60:~ # ip -V ip utility, iproute2-ss110629 T60:~ # ip addr show dev eth0 2: eth0: ...
0
votes
1answer
23 views

How to get the maximum details from a remote host and forcefully get a particular IP?

I have setup a Ubuntu server(xxx.222.4.216) for our Redmine tool and recently we got a IP conflict in the machine and now im unable to get back the IP(xxx.222.4.216). I would like to know if there is ...
1
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1answer
3k views

Centos/OVH: public IP on KVM virtual machine

Since a few days, I'm trying to configure my KVM vm to have a public IP address, without any success. First, I'm on OVH, and you need to know they don't allow networking from different mac addresses. ...
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1answer
45 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
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1answer
24 views

ip route command with source option

I have multiple interfaces on my system catering to different subnets. I also have a pseudo interface which is a p-to-p driver for tunneling packets. I was trying to add routes using ip route command ...
0
votes
1answer
41 views

Ports needed for IP Subnet discovery Kaspersky Security Center 10

I'm trying to discover computers based on IP subnets. The administration server is not part of the same workgroup or active-directory as the clients, so this is the only way to do it. I can ...
0
votes
2answers
815 views

Adding a static route to a virtual interface using configuration files rather than ip command

We statically assign our routes using the /etc/sysconfig/network-scripts/route-ethx files. This makes managing them fairly easy since we add the routes during the kickstart process (by way of ...
13
votes
4answers
15k views

How is route automatic metric calculated on Windows 7?

KB299540 explains how Windows XP automatically assign metrics to IP routes: The following table outlines the criteria that is used to assign metrics for routes that are bound to network interfaces ...
2
votes
1answer
195 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
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1answer
21 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 ...
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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 ...
5
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0answers
82 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: ...
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1answer
55 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 ...
0
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1answer
37 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 ...
2
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0answers
39 views

How do large SaaS providers support A records? [closed]

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 ...
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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 ...
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0answers
14 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 ...
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0answers
10 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 ...
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votes
1answer
26 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
48 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 ...
2
votes
0answers
46 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
19 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 ...
0
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2answers
414 views

Static IPv4 tunnel with Windows Server 2008

Is it possible to create any sort of plain (IPv4, non-ipsec) static tunnel interface using only components of Windows server? Any protocol will do as long as there is reasonable linux support for the ...
65
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4answers
68k views

What's the difference between ip address 0.0.0.0 and 127.0.0.1?

I do know that 127.0.0.1 ~ 127.255.255.254 are the loopback IP addresses for most modern operating systems and we could use these IP addresses to refer to our own computer. But what's 0.0.0.0? It ...
3
votes
4answers
149 views

Remove IP with ip command in linux

If I add two IPs like this: ip addr add 1.1.1.1/24 dev eth2 ip addr add 1.1.1.2/24 dev eth2 and then I try to delete one of like this: ip addr del 1.1.1.2/24 dev eth2 BOTH IPs will be deleted ...
0
votes
2answers
60 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 ...
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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
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1answer
35 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 ...