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

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All nework interfaces hang for seconds while one interface goes up/down

I am building a client/server application that uses several network interfaces in parallel for redundancy, and I have noticed that while one network interface goes down or goes up, the communication ...
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55 views

heartbeat doesn't work on virtual interface

I try to use vertual interface as broadcast for heartbeat(bcast in ha.cf). When I try it I see this message in syslog: May 23 12:17:26 Ubuntu2 heartbeat: [1107]: ERROR: glib: Error setting socket ...
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67 views

How often does the geolocation associated to an ordinary IP address usually change?

Can anyone tell me how often should i expect a routable IP address (either v4 or v6) to have its associated geolocation (country + city level) changed, in average? I'm asking this because i'm ...
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119 views

Virtual Machine IP address type changed from static to dynamic

I am testing VMM in a lab environment, I have one VM host machine with one physical network adapter that has been allocated an IP address in the 192.168.1.0/24 subnet on a router. I have create ...
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99 views

What could be the cause for outbound TCP/IP traffic beeing blocked while ICMP is still working?

On a Windows Server 2003 there is a strange issue. Every 6 hours the server don't accept outbound TCP/IP traffic while inbound traffic working fine. If the problem occurs I can connect with RDP to ...
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27 views

squid as parent of url filtering

I have this situation: client -> url-filtering -> squid -> internet The squid proxy sees all clients as a single IP ( of url filtering) so I have a lot of connections from a single IP. Squid is the ...
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21 views

graceful tunnel remote change

I want to solve a networking problem: Say I have 3 machine A, B, X in a local-network, where user have access to network resource of X's network interface tunX, which is a tunneled interface connects ...
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63 views

Internal IP leaked to the public network

I am a programmer and I have made a production server that resides on public IP and listens for UDP packets. The purpose of this server is to collect UDP packets from a huge sensor network. And also ...
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36 views

Modems unable to acquire dhcp IPs

I work at an ISP where we use routers (7200) for dhcp. I recently reloaded one of our dhcp routers because we had complaints from many users unable to connect and the dhcp database file it was ...
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75 views

Wireless Bridging two Sonicwall Firewalls

We have two sites (essentially two small buildings side by side but we are unable to run CAT5 cable between them) which are currently linked via a wireless bridge. We will be splitting the sites so ...
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78 views

forward a specific port from linux server (ubuntu) through firewall server (ubuntu)

I'm doing the following: % autossh -i YYY.pem XXX@SERVER -N -R 90:localhost:9000 -o ServerAliveInterval=30 to forward a server port from the local machine to the public machine. But connections ...
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64 views

AWS IP Forwarding

I have an Elastic IP on AWS that I want to forward to a Public IP outside of AWS. Any ideas how I could accomplish this?
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199 views

Dell Equallogic SAN - 4000 series to 6000 series connectivity issues

I have a 4000 series in production with two physical NICs and a group IP. I have a 6000 series in a DR site with four physical NICs and a group IP. 4000 series NIC1: 10.0.12.2 4000 series NIC2: ...
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252 views

iptables dynamic NAT, SNAT: force overload on exhaustion

Is there a way to specify the use of iptables NAT'ing where you can use SNAT for a pool of outside addresses, but when the last IP is about to be used it is used as an overloaded outside IP? I ...
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302 views

switch OFF syn cookies

We have several servers they have public IP's, but work together (one is with Load Balancer, orther with Apache Web server, other with MySQL and so on. Most of the ports are fire-walled, so only ...
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124 views

How to make all of my IPs works in HyperVM XEN?

I've installed HyperVM on CentOS 5.8 final to make XEN VPS. I have 5 IPs, and added them to an IPPool. They are from *.123 to *.126. But when I add Virtual machines, just the first one (which indicate ...
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71 views

Precenting ISP IP leakage using VPN gateway service

I read a post here on serverfault detaling a procedure to re-route gateway traffic to a fake gateway to prevent ISP IP leakage if VPN dropps. My questions to adapt this prcedure to my specific needs ...
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32 views

What could cause a group of machines to fail loading secure web pages only when assigned certain IP addresses?

I have about 20 cloned machines running Windows XP Pro SP3. Three of the computers are experiencing an issue where clicking the 'Proceed to checkout' button from the amazon.com shopping cart causes ...
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150 views

keepalived - service not available on the 'passive' host

I've got ip failover configured on two hosts for a mysql (percona) cluster with keepalived; the failover works as expected, but I cannot access the service from the host that is passive or in ...
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116 views

Steps to analyze web server performance for only one Ip

We have a 2008 server, hosting 40 domains. All of our projects are developed in asp.net and using iis 7.5 in our server. Nearly 35 of these domains are sharing one IP and the other 5 is sharing ...
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56 views

Server 2003 R2 - II6- granting access to website via IP with subnet range

We are trying to allow for a client to connect to our website. By default we are Denying all access except for those with the specified IPs we have configured to run, everything before has just been a ...
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123 views

added IP address to Win2k8r2, unable to use it in IIS

I've gotten another IP address from my host. I added it to the networking settings. I can now ping that new IP address. I've bound a site in IIS to that new IP address. But i can not connect to that ...
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209 views

Can I map IP addresses to allow 2 site to site VPNs with same IP range using Microsoft TMG

I have a Microsoft TMG server with a number of site-2-site VPNs which all have different IP address ranges. Now a client has asked for another site-2-site VPN but their IP range clashes with an ...
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16 views

DD-WRT OpenVPN Client Router not routing

I have been trying all weekend to solve this and unfortunately no success. I have a DD-WRT installed router, which is intended to be a gateway or tunnel to an OpenVPN server via the internet with the ...
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9 views

Cisco ASA5505 Public IP Address

I am trying to configure a Cisco ASA5505. I am using the GUI start up wizard. When I assign the outside IP address to be a public IP address the configuration will work but after about 30 seconds the ...
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18 views

Unable to communicate with web proxy server on iOS

I am following the instructions on how to use a HTTP proxy with an iPhone, however I appear unable to communicate with the HTTP proxy. I have configured the settings in my phone correctly to use the ...
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25 views

ISPConfig and node.js on second IP

I have 2 IP addresses and I use ISPCOnfig and I would like to run node.js in on of the IP. How would I do that. I do not find any documentation regarding to ISPConfig
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27 views

KVM Networking guest issue due a provider networking limit

I have a KVM setup on Centos 6.4 64 Bits. My server provider assign us a Main IP to the Host with a gateway and netmask. Also our provider assign us additionals IP ( not in the same block as the Main ...
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32 views

Restrict DNS Resolver to specific IP Ranges

I'm running a Windows Server 2012 R2 for DNS. Is it possible, to allow normal DNS Requests for everyone whilst restricting the Resolver Service to a specific range of IPs? We tried it with the ...
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31 views

EC2: Persistent IP/Host for internal communication

I have a few servers on EC2 which intercommunicate using a RESTful interface. Currently, the addresses are saved in a configuration file which lists explicit IPs. This is prone to errors, because it ...
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56 views

Can I change venet0:0 main ip to venet0:1 ip?

I would like change my main IP from venet0:0 to venet0:1. Is this possible? This is my ifconfig: [root@marketport tmp]# ifconfig lo Link encap:Local Loopback inet addr:127.0.0.1 ...
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34 views

Using NAT with iptables between corporate network and firewall'd corporate network

At work we have a firewall between two networks. I was told they opened up the two ports for me but I needed to modify the IPtables to allow packets to go through. I'm not familiar with the correct ...
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137 views

ZNID24xx-Router public IP

I need to make my public IP the same as my internal one. My router is ZNID24xx-Router, and i'm trying to change the config of port forwarding, but i'm not certain this is the right thing to do and i ...
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36 views

Jetty and IIS on same server, different IPs

I have Windows Server 2012 R2, fresh install and I am running there IIS for .NET applications, now for many different reasons I want to run Jetty on a same server. IIS is setup to listen only on (for ...
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79 views

localhost answering wrong ip

No idea how/why, but here's what I'm seeing. Consider 3 CentOS 5.10 boxes: Host A [10.1.2.7] Host B [10.1.2.8] Host C [10.1.2.9] All of a sudden we're getting strange behavior from Host X, ...
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56 views

Linux Loop two ethernet interfaces

-1 down vote favorite I would like build a topology like this one : [ eth1 <--> eth2 SAME PC] Where two interfaces ping each others without going through the local machine, as they were two ...
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91 views

Tracert of a spoofed IP results in Infinite Loop

Our firewall picked up a spoofed IP address that caught my attention. When I did a tracert to the spoofed IP address I get what I think is an odd response. Tracing route to 192.168.1.7 1 1 ms ...
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26 views

Jumphost VM not able to communicate with LAN

I have setup a jumphost VM on WinXP. It has 2 NICs. NIC1, which is the LAN, has the following IP settings: IP: 10.0.0.1 /24 (No default/ DNS configured) NIC2, which has external connections, has ...
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77 views

Edge firewall on Ubuntu, dynamic IP address, static DNS

We're setting up a software firewall, and one of the issues we're facing is that eth0 has a dynamic IP address. In /etc/network/interfaces we've got the following: # The loopback network interface ...
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74 views

Debian on VM has web access but can't be pinged

I have just installed Debian on a Virtual Machine. I have internet access on the VM and installed SSH. I then did a ifconfig and discovered that the IP address is 10.0.2.15 which is strange as the ...
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43 views

getaddrinfo (ping) is showing out of date IP Solaris 10

We recently moved a Solaris 10 machine to a new IP. We made changes to ifconfig, /etc/hostname.*, /etc/hosts, /etc/inet/hosts, /etc/netmasks, /etc/defaultrouter, and DNS. We did not reboot. We tested ...
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242 views

How change Broadcast ip address manually (CentOS Machine)

i figured out subnet mask & broadcast ip addresses of eth0 device in my CentOS machine are different from datacenter email. datacenter email was like below : Free IP: ...
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78 views

how change the output IP of every PROXY to it's own IP in CentOS (SQUID- Multiple IP)?

i configured a proxy server in CentOS server using with squid i have multiple ips like these : 192.233.76.1 ~ 100 i've added those ips to my one interface. so every HTTPS proxy works well -> ip ...
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202 views

ModSecurity on Apache (Debian Wheezy), real-time IP-Blacklist from file

I am creating and updating an ip-blacklist dynamically with a php script based on specific bot behaviors or actions. The functions I use in the script add or remove ips, based on ban-duration set for ...
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66 views

Can a source send two fragmented IP packets at the same time?

I'm developing an app that does NAT between a virtual TAP interface and a physical interface, and I'm not sure how much buffer should I allocate for IP fragmentation. According to Wikipedia the ...
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39 views

Binding of IPs not working

I have two IP address ranges in my server. CentOS 6.2 The first one, is ok and working Then second range is suposed to be binded to eth0, using the cloning resource available in RedHat systems. My ...
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134 views

Public IPs behind Watchguard Firebox for deploying Lync

We have an XTM 515 Firewall in our company and are in Lync 2013 implementation phase. For the Edge Server we need 3 different IP addresses. Our ISP provided 8 addresses in 2 different subnets. For ...
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35 views

CONNMARK on rewritten packets

I have tried to ask this question on superuser, for it, being a custom setup, belongs there, but that got no answer even with a bounty. I have a host, on which I rewrite saddr and daddr of IP packets ...
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108 views

Why is an ack response being sent to the wrong gateway?

I was trying to determine why a packet forwarded by iptables to my internal lan is returned on the wrong gateway. Having investigated this further, I determined that, at least in the case of one of ...
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55 views

Where can I find the range of IP addresses of my container OpenVZ

I'm looking for the "range of IP addresses of my container"... Where can I find those ? /etc/network/interfaces ? ifconfig ? I don't know and I can't find any answers... I need it for this tutorial ...