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

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214 views

some IPs within a subnet not reachable

I'm running 3 Debian-Servers, each with its own IPMI. All IPs are within the same subnet with the same gateway. The problem is, that each server can ping its own IPMI but not the IPMI of the other 2 ...
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13 views

running or building docker results in net.ipv4.ip_forward being reset

this is on a rhel6 system (docker 1.7.1 from epel). basically, everytime i do a build or a run, i can see that the net.ipv4.ip_forward sysctl gets reset to 0 - which results in the container loosing ...
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119 views

how to associate a Docker network interface to a Linux network interface (eth5) on Linux host?

My Linux host has 8 Ethernet interfaces, eth0 - eth7. I'm running three Docker 1.9 containers on this Linux host. How can I associate a network interface inside one Docker container to a specific ...
2
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110 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 ...
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433 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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48 views

How to configure DNS (outside Azure) and Windows VM in Azure

I have just started getting to grips with moving existing websites in to Azure on a Windows Server (2012) VM. How do I set the DNS records (managed away from Azure) to go to the site set up on that ...
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13 views

How do I use Client9's IPCat with IPTables

I'd like to block all ips of all datacenters in the world with this list: https://github.com/client9/ipcat But I don't know how to use that list, I'd like a bash script that checks if there's an ...
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25 views

How to use virtual interface as default interface

I've got a cloud SSD VPS @ OVH, and I'd like to change the default interface used for requests. I have two interfaces: eth0 (which is the default interface) and eth0:0 (which is the new virtual ...
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74 views

2 IP cameras with same configuration but different behaviour

I have a Vodafone Station router, and 2 IP cameras connected to it through an Ethernet cable. Both have the same configuration. Both DHCP enabled, one has IP 192.168.1.10 with port 81 and the other ...
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72 views

Samba shares don't work when mounted via host names from /etc/hosts

I have /etc/hosts file with this line 10.1.17.123 SAMBAWINSERVER I am trying to mount samba shares referencing server by name in the hosts file. I tried to mount it via regular mount command or ...
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116 views

IP-rules don't seem to be working on CentOS-6.6

I faced a bit odd difficulty with policy-based routing on CentOS-6.6 server. I have a setup where I need to enroute all packets originated from 172.25.0.0/16 destinated to 172.24.0.0/16 and some ...
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797 views

FortiGate 310B public ip pool into internal port

I have a FortiGate 310B with WAN port with /27 public IP pool from the ISP. The WAN port is configured with primary IP 1.1.1.1/27 I would like to provide servers within the Internal port a public IP. ...
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466 views

Does netfilter reassemble IP fragments when packet is forwarded?

IP datagram should be reassemble in the termination of the path because the fragments may arrive from different paths. I think Netfilter need to reassemble a IP datagram to inspect the whole payload ...
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258 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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261 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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69 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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39 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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130 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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94 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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413 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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471 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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162 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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74 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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37 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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164 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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148 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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63 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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127 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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230 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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28 views

How to change IP-address of the Synology NAS-station when using VPN-connection?

I have set up VPN-connection (L2TP/IPSec) at our office lately. The main thing is that our employees could access Synology NAS-station from their home. VPN-connection works great, but the problem is ...
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13 views

How to make D-LINK switch IP permanent

I have procured a new D-Link Switch. I have changed its default ip address from 10.90.90.90 to a new ip address. eg - 192.168.100.101. But I am unable set the ip permanently. Whenever I power off the ...
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23 views

IP aliasing to a bridge interface under systemd

With Debian 8.1, how does one add a second IP address to a bridge interface under systems? Like in "IP Aliasing"? I tried it this way... In /etc/systemd/network subdirectory: File 40-br0.netdev ...
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15 views

Restrict GitLab project deployment to IP above SSH key

I was thinking if I can restrict pulling, cloneing, eftching a repository by IP above the SSH key authentication. Imagine the worst situration: Somebody steals my SSH key and Passphrase Finds the ...
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26 views

DNS registration by Windows Servers not updating automatically (after reboots)

I have an issue with our Windows 2008-2012r2 servers not updating their DNS records automatically after reboots. After a while the records get removed from our DNS-servers (running 2012r2) making the ...
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48 views

Proxmox VMs with single IP

so I don't know much about the bridges and all, but I looked around and tried to get it still working. I've got one IP for the server itself and I thought to use second IP on the VMs. I thought I did ...
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29 views

IP Address and Dom0 IP Address

What is the difference between normal IP address and Dom0 IP address? As far as I read so far, Dom0 IP is associated with VMs instances but I want to know if it there is a subtle difference here.
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13 views

What is the Red Hat equivalent of the windows “Register this connections Address in DNS”

Hi I have a collection of RHEL6 server each has 3 static IPS and interfaces Currently when we nslookup the hostname from another server it returns all 3 interfaces from the DNS server (windows) We ...
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31 views

Static route to access another IP/SUBNET from PC

Maybe it's a simple concept misunderstand. I'm in a network with ip 172.16.0.xxx (mask 255.255.240.0). How could I configure my PC (Windows 7) with a static route or any other kind of solution so I ...
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10 views

rsyslog: Template for hosts sending from 172.16.0.0/12

What is the shortest template to capture all hosts sending from an IP address within the 172.16.0.0/12 network? I would like to avoid multiple :fromhost-ip statements. Basically, I'm trying to create ...
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40 views

Assigning IP addresses to Docker containers via DHCP accordance with local segment

Here, I want to set the IP address on ubuntu images in accordance with the existing IP Segment in my local. I've configured the Ubuntu images with dockerfile, by installing mc, and openssh in the ...
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37 views

Varnish 4.x Unable to Pass Client IP

I'm currently using varnish to reduce the load on my server, however, because I want to be able to know what IP is being used regardless of my php $_SERVER request method for a visitors IP, I decided ...
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24 views

IP range connected to my server suddenly times out

I've been leasing several /24 subnets from an external source and then I had my hosting company route them to my server. I've added the IPs using a network-script file ifcfg-eth0-range1 with contents ...
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41 views

Cisco 2960X & IPDT

I am interested in finding the IP addresses assigned to devices attached to each interface on a Cisco 2960X switch. It seems like IPDT is exactly what I'm looking for. However it seems like the ...
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39 views

Preventing IP wildcard address from binding to entire loopback range

Servers often use the IPv4 wildcard address 0.0.0.0 to bind to all interfaces, one of these being the loopback interface (127.0.0.0/8). On Windows, is it possible to prevent binding to the entire ...
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34 views

Ubuntu - Destination Host Unreachable Through Router / ARP Requests

Very strange issues on an Ubuntu server running DNS. Here is the network setup. There are two class C network ranges. Let's say they are: 216.107.249.0/24 216.107.250.0/24 Server is assigned an ...
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10 views

debug connection to other server

My server suddently is unable to connect to other servers through Curl, file_get_contents etc. This issue is reported for at least 5 different server Ips. Whereas it still works with many others. ...
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25 views

Redirect external ip of server to external ip of virtual machine

I have a server with multiple virtual machines. Let's say this is my server ips: Internal 1.2.3.4 External 5.6.7.8 Now, if i go to 1.2.3.4:8082 it goes to my app (I redirect :8082 to de internal ip ...
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25 views

Support for Broadcast

I'm working on a research paper that may rely heavily on broadcasting. I've written a small prototype application to test broadcasting in a university setting, and everything works as expected. I've ...
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37 views

What is the 'group default' part in my ip link output?

I've got two servers deployed on AWS. I've got trouble connecting to one from Linux and strangely not from OS X. What I meant by connecting is large: opening an ssh connection or getting the content ...