Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

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A DIFFICULT CONFIGURATION OF 2 NICs

I have 2 network card: elan01: The work network with proxy, I use this for all the system and for the internet. I want to use this for almost every page. wlan01. I connect this direct to a ISP, but ...
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1answer
40 views

Debugging why network packets are being dropped

Preface: I have an application that I am currently testing out that runs on RHEL 6. The setup for my test is the application installed on a embedded device, connected by an Ethernet cable to PC that ...
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1answer
22 views

How to redirect traffic through IPv6 IPSec (strongswan) gateway?

I'm trying to set up IPSec secured connection to the gateway. Have three hosts: A: eth1 - fec0:1::1/64 B: eth1 - fec0:1::2/64 eth2 - fec0:2::2/64 which is gateway between A and C; forwarding is set ...
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1answer
28 views

Splitting a single fiber connection with multiple public IPs to two separate routers

We have a single WAN connection coming into our office and have 5 public IP addresses from our ISP. We have 2 separate entities underneath our main company and I want to be able to completely split ...
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2answers
41 views

VPN Connectivity

My office has VPN connectivity with client network which allows us to access internal applications at client side. My company is setting up another office in different location for which we need ...
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20 views

Proper packet size for ping test

I have been seeing an increase in network related issues lately and have started running some ping tests to different offices in the company to try and get a baseline. I want to run continuous pings ...
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0answers
16 views

connect a DSL modem with another router to load balance

How to load balance two different ISP connection one via DSL modem and another through a Dongle as iam using an ASUS router in between them.Iam a networking guy im new to it please help!
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14 views

How to share Psiphon with PC [closed]

I use to share my OpenVpn with PC using Connectify since OpenVpn comes with TAP-Windows Adapter. I will like to know if there is a way to share Psiphon vpn with PC.
4
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1answer
30 views

Can HP Virtual Connect modules be used as a layer 2 switch?

I have an HP C7000 enclosure which I recently upgraded with a pair of HP Flex-10 Virtual Connect Ethernet modules (HP PN: 455880-B21). Each module has 16 downlink ports to connect to server blades ...
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38 views

Unable to set server IP address

I have a SBS2011 server that I have virtualised and now need to set the IP address for the network adapter. Initially I was warned that the IP was allocated to a device that no longer exists which ...
0
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1answer
56 views

Connection refused to local port

I'm trying to setup a dedicated server for Rust (a game) on an AWS EC2 VPC instance running Ubuntu 14.04 64-bit. Following the instructions, I got the application started and listening on its default ...
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1answer
18 views

Create vxlan - RTNETLINK answers: Operation not supported

I knew nothing of vxlan until about 30 minutes ago, however I've come up with an issue installing OpenStack, which is vxlan related. Trying to create a vxlan on an interface on Ubuntu 14.04 (kernel ...
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12 views

IP SLA in software [closed]

I am thinking of developing a small piece of software that will mimic part of the Cisco's IP SLA feature. I am wondering, if network connectivity fails, how can one change the static routes of a ...
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0answers
17 views

Network bridge fail: RTNETLINK answers: File exists [closed]

So, i have a Debian Testing network router, which started acting up on me. I'm getting this error on network initialization: Apr 24 17:40:42 r2d2 ifup[621]: RTNETLINK answers: File exists Apr 24 ...
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0answers
25 views

How smart is a network? [closed]

There is an argument within my office about how smart/efficient the network we have set up, really is. We have a fibre line and a cable line running into a load balancing router, which has a hardware ...
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1answer
23 views

How can I only allow TCP connections for 1 port using iptables on Unbantu? How can I also set a maximum packet on a connection?

I'm running a server for public. I just want to allow TCP connections and I want to limit the packet to prevent ddosing a bit and setting a maximum IP/new connections per seconds with iptables. How ...
1
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0answers
21 views

ifconfig output different for non-root user

we use a montoring system to capture network traffic. the output as root user is fine: eth0 Link encap:Ethernet HWaddr 00:1E:67:E6:D6:FE inet addr:149.56.19.13 Bcast:149.56.19.255 ...
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15 views

DNS Issue on Windows sever 2012

First of all, I am not even sure if this is pertaining to DNS please bear with me and thanks for your patience. We are in midst of doing hardware upgrade for SAP ERP system for a defense client so ...
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2answers
59 views

Is order of network routes important in Linux?

On one of my web server the loopback route is in 2nd position and usually it is in 3rd position on other server when displaying the routes: >ip route show Results on what is displayed on one ...
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14 views

Kvm virtualization packet loss on guest machine

In Ubuntu 14.04(64-bit) by using KVM virtualization and bridging network I have about 10% packet loss in my guest machine and I have no packet loss on host machine. server1@xxxx:~$ uname -a Linux ir1 ...
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0answers
13 views

switch not giving desired dhcp leases [closed]

Our college has one router. a switch at each hostel floor. now if this router is disconnected from the switch then switch assigns IP addresses in the range of 192.168.x.x but if the router is ...
0
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1answer
23 views

Addon domain redirects to Main Domain

I have a VPS from Ramnode which I am using to host my primary domain http://african-dreamtravel.de/ and I went on adding another domain (http://www.lagerregal-pruefen.de/) to the VPS today. Although, ...
3
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2answers
66 views

Measuring 40Gbe performance

I've connected two hosts via a 40Gbe fibre link and would like to determine a baseline for data transfer between them. I'm seeing relatively low speeds (~620MB/s). It seems that the signalling rate is ...
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1answer
39 views

Running LAN services on a router/firewall [on hold]

So I work in a company where we have a linux machine acting as a router/firewall, and I like all the control you get in this kind of setup compared to having a consumer grade router that ISPs usually ...
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71 views

Windows Server 2008 - DNS Server service immediately stops are starting

Hopefully someone can explain to me why this is happening or even just how to fix this. Our sole domain controller in a branch office has been having a bunch of issues all of a sudden. It started with ...
1
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1answer
24 views

Disable eth0 on boot, but allow to turn back on

We are setting up an offline/offsite backup server. The purpose is to have it offline and uncontactable from anything. Then, once the cron starts the backup process it will enable the network, backup ...
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29 views

Redirect locally generated HTTPS traffic through external proxy

I have a configuration like this: Internet | Public Zone | Private Zone IP x.x.x.x |<--- Forward Proxy / WebCache | <--- Linux Server (RedHat) ...
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42 views

Drop fragmented packets in nftables

Using iptables is it possible to block fragmented packets with this rule: iptables -A INPUT -f -j DROP But there isn't a equivalent in nftables. There is any way to do it?
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1answer
37 views

How to optimize throughput on a linux NAT/router?

I am trying to use an old Fujitsi RX300S2, with a quad core Intel Xeon CPU @2.80GHz as a Gitabit NAT router, it has a dual gigabit NIC on board over PCI-X. The router will also forward multicast ...
1
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1answer
27 views

Unable to connect to EC2 instance from another instance

I recently added a service on server A that needs to be accessed from server B. The service is listening is on port 8182 and is operating normally: [ec2-user ~]$ sudo netstat -tnlp | grep 8182 tcp ...
0
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2answers
88 views

Collectd --> Elasticsearch if remote-host can't connect to central elasticsearch

Goal Central storage and way to analyze performance numbers: cpu load ram usage ... Current strategy I would like to implement a setup like this: collectd logstash elasticsearch kibana Like ...
3
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3answers
277 views

How to load balance with respect to memory, disk usage, and other attributes

I've found load balancers such as NGINX but those seem to work only by keeping in mind CPU usage and network traffic. How would I load balance with respect to other variables such as the amount of ...
0
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1answer
53 views

How to connect to OpenVPN clients from LAN 'members'

Working on a IoT type of thing, I want to connect some devices "in the wild" to servers in AWS through OpenVPN on an EC2 instance. So far I have been able to set up an EC2 instance configured as an ...
0
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1answer
28 views

How can ping resolve an address but other programs can't?

I get this: $ ping outlook.office365.com PING outlook-namwest.office365.com (132.245.24.2) 56(84) bytes of data. 64 bytes from 132.245.24.2: icmp_seq=1 ttl=242 time=17.6 ms $ wget ...
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38 views

Windows 7 suppression of tcpip event 4199

I've noticed that Windows 7 doesn't raise event 4199 (Duplicate IP on network) consistently when assigning static IP addresses to machines. If we configure 2 machines correctly with non-conflicting ...
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13 views

Iptables linux routing with 2 chain proxies

Im trying to setup a connection between a PCs in my local network, to foreign resource XYZ in a specific way. My network is currently configured like this: I have a pc behind the proxies -> Then I ...
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16 views

Connection to specific firebird 2.5 server is slow

I have the following setup: Two laptops connected to a network using the same switch Multiple Windows Server running Firebird 2.5. My problem is that when I try to connect to one specific firebird ...
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0answers
36 views

IPSEC help using Strongswan on CENTOS 6.6

I have been tasked with setting up an IPSEC tunnel to our remote data provider. They require my Phase 2 traffic to be PAT'd behind a public address. I am using strongswan 5.3.2 on CentOS 6.6 on a ...
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14 views

refer to an ip range list in gcp?

I have a list of ip ranges I keep adding to all my security tags to only allow inbound traffic form them, is there a way to store this list somewhere on GCP so I don't have to repeat my self?
1
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1answer
40 views

HAProxy dynamic server address based off of header value

Hello I'm attempting to route traffic back to a users machine in order to run a site locally but picking up the headers/cookies/routing logic for other origins that HAProxy supplies. Thus far though I ...
1
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1answer
58 views

ICMP ECHO REPLY is not being SNATed correctly

I am trying to provide L3 connectivity between two remote LAN networks (10.0.0.0/24, 10.0.1.0/24) using OpenVPN with the following setup: +----------------+ +---------------------+ ...
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0answers
15 views

ipSystemStatsOutDiscards increments, but not the interface specific counters?

Here's an odd one. I noticed that one of my nameservers was complaining about some outbound congestion, and that it seemed to correlate incrementing interface discards on my outbound path. Open and ...
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29 views

KVM/QEMU Connecting guests only to other guests

Heyho guys, I have one host machine with multiple VMs on it. Their gateway is the host machine (which is doing some NAT etc.). There's one bridge at the host machine and a default virtual network ...
1
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1answer
30 views

How to disconnect the openvpn client, when another client connects using same certificate?

I have openvpn server. There is no "duplicate-cn" in configuration file. The sequence of my actions: Client A connects to server. Everything works. Has access to server and to internet. Client B ...
2
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2answers
43 views

Remove Cached UNC URL Credentials Win 10/Server 2012

I need to remove the UNC\URL credentials of a share accessed via IP UNC\URL from File Explorer. For example, last week I logged into 10.10.10.20\someshare, and now, when I go to it, I do not have to ...
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36 views

How to debug issues with IPSec VPN using Shrewsoft's VPN client

I am trying to connect (from an ubuntu machine) to a IPSec VPN with pre-shared key using Shrewsoft's VPN (ike) client (just because there is an exported configuration for this client available, there ...
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1answer
31 views

Connect virtual subnets from two physical host

I have proxmox 4 based on debian 8 on two hosts A and B. Both have two NICs. One NIC from each host is connected via a Crossover cable. Host A: eth0: public IP eth1: 10.0.0.2/24 vmbr1: 10.0.0.1/24 ...
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10 views

Force an application to use a specific connection [migrated]

So my Mint 17 has 2 connections (wired and wireless) when both connected by default the wired is used, what I want to do is keep wireless for file download and general Internet usage, and use the ...
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1answer
41 views

Can't connect to Ubuntu server on LAN from pfSense VPN

Quick summary pfSense server is connected to the WAN and LAN. This box also has an OpenVPN server running. The LAN clients use 192.168.20.0/24 OpenVPN clients use 192.168.30.0/24 On the LAN I ...
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2answers
75 views

Getting NIC speed from Powershell on Win2008 R2 Server

I am trying to get the NIC speed via Powershell on some of my servers. For my lab server I know there is a 1GB NIC in there. However, when I do this via Powershell I get the below weird number: ...