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

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Reduced network throughput between linux guest and windows host

I'm running a CentOS 7 Linux VM in VirtualBox. A client application runs in the guest and a server application runs in the Windows 10 x64 host. I had a performance test whereby the client invokes a ...
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1answer
7k views

Unable to see Samba server by netbios name

We have a linux server set up with a number of samba shares on our mixed windows/mac/linux network. The shares are accessible if we go to \\192.168.x.x\share, however we can't access the server by ...
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2answers
122 views
+100

Route all network traffic through an openvpn connection and also accepting incoming requests on the hosts' real IP-address

I am searching for a solution to route all traffic from a server through OpenVPN but keep it possible to host applications on the server which can be accessed outside of the local area network. To ...
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2answers
25 views

How do I resolve hostnames on the local network in Linux Mint?

Nothing on Google, other questions on the stack websites or anywhere else seems to answer my question. Let's pretend that my Windows laptop is using the device name mylaptop. Other Windows' devices ...
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0answers
6 views

network device enrollment service greyed out

I've recently installed AD Certification Authority on one of our DCs. It acts as a subordinate enterprise CA, the Root CA is a standalone offline root CA and there is no connection between those two ...
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1answer
12k views

Will increasing net.core.somaxconn make a difference?

I got into an argument on the net.core.somaxconn parameter: I was told that it will not make any difference if we change the default 128. I believed this might be enough proof: "If the backlog ...
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1answer
2k views

openvpn: after changing to server mode, client does not create TUN device

I had a previously working configuration with the config files used in a previous question However, I've changed this now to the following configuration using server mode, everything on the logs seem ...
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1answer
29 views

What should i use instead of eth0:1 if it is deprecated

usually i create /etc/sysconfig/network-scripts/ifcfg-eth0:1 and /etc/sysconfig/network-scripts/ifcfg-eth0:2 but i seen in internet that it is deprecated using eth0 :1 so what can i use to the VPS ...
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2answers
4k views

How to block all incoming request through one network interface?

Saying I have a linux server as a router from LAN to WAN. I don't want any incoming WAN request for safety issue. So how should I block all the incoming request through the WAN interface, but ...
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0answers
19 views

New virtual interface for second set of DNS servers

I want to create a new virtual network interface within Windows that uses the same gateway as the physical adapter, but with different DNS servers (for a DNS proxy service) and use this as a priority ...
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1answer
15 views

Traffic from within Docker containers routing incorrectly— traffic from Docker host routes correctly

I'm seeing a weird problem where traffic originating from within a Docker container located on a VM in the Google Cloud in europe-west1 and destined for a UK company based in Amazon's Cloudfront is ...
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1answer
26 views

debian networking does not restart properly

I have a Debian 8 machine, where I've configured two VLAN interfaces in /etc/network/interfaces. Now I've deconfigured it (deleted information from interfaces file), restarted networking, and now it ...
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1answer
56 views

Routed bridge networking for KVM guests along with eth1 alias interfaces for shared hosting with dedicated IPs for each virtualhost

First question here on serverfault, so kind of a newbie, all feedback is welcome. I have a dedicated server running Debian GNU/Linux 8.4 (jessie) with one public IP and multiple additional public IPs ...
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0answers
14 views

virtualbox networking - difference between 10.0.2.2 and 10.0.2.15

I setting up a vm-based appliance on VirtualBox (using Chef) and, while I have figured out my networking out by trial and error, I'd like to understand better what's going on. Basically, I have 3 ...
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0answers
21 views

cisco asa public server nat issue

I have been tasked with some ASA configuration coming in a few weeks, and to test out some configuration options I have setup a web server on my local network which I would like to be able to access ...
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3answers
19 views

Expand wlan with a wlan router or access point

My wish is to expand the WLAN network, because of aborted connections. That means, the "central" router gives the internet connection in the LAN and the other router/access point uses the LAN ...
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6answers
24k views

Ubuntu Server 12.04 can access LAN but not internet

Using Ubuntu Server (12.04) via command line, I can access the LAN (e.g. ping local machines) but not the internet (e.g. "ping google.com" or "sudo apt-get update"). How should I troubleshoot this? ...
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1answer
37 views

“Ipcalc -n ipv6_addr” command is giving error

I am trying to calculate network address of Ip address by using Ipcalc command. when i am using ipcalc -n ipv4 address,then it is running fine and give the network address for the IPv4. But when i ...
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1answer
26 views

CentOS 7 statically configured network adapter keeps getting DHCP address

This is driving me nuts. I have a CentOS 7 system. It is acting as DHCP for the network it is attached to, is running Cobbler and PXE, but it is not the gateway. It is the primary file server for ...
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0answers
29 views

How many IP addresses can a single network interface have? [on hold]

The title says it all. Looking for the maximum number of different IP's. Having some trouble finding information on this topic. Can anyone help or point me in the right direction?
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1answer
1k views

vpnc client ( open source ) that can connect to checkpoint gateway

I am searching for a long time a vpnc client ( open source ) that can connect to checkpoint gateway ( firewall ) Until now without any results I need vpn / vpnc client for Linux machine ( no matter ...
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1answer
22 views

Xen Server interference on ARP requests

I have a strange behaviour on my network as my unix-like hosts seem to have problems to reach the gateway. Digging into the network traffic via tcpdump, I've seen that two different hosts answer to ...
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0answers
6 views

VirtualBox won't forward port 80 [migrated]

Windows 8.1x64 host, Debian 8.3 guest. I've got 2 network adapters set up: 1st is NAT and 2nd is Host-only. I have set up port forwarding for ports 22 and 80 for NAT adapter. Port 22 works (meaning I ...
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3answers
6k views

Can Wireshark capture an entire Ethernet frame including preamble, CRC and Interframe spacing?

I am examining an Ethernet frame in Wireshark. According to the "Ethernet frame" Wikipedia article and accompanying diagrams, "A frame starts with a 7-octet preamble and 1-octet start frame delimiter ...
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1answer
28 views

Proving packets per second bottleneck?

I have a '100Mb' network connection that's currently consistently transmitting at about 20K packets/sec, irrespective of packet size in the range of 300-600 bytes. This yields an observed bandwidth ...
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0answers
13 views

Windows Server 2012 Printer Management

I want to add a shared printer connected to a host IP (192.168.0.10,windows 7) , to a server (192.168.0.200,windows server 2012). When adding a printer using the Printer Management just the IP ...
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0answers
23 views

cannot reach gateway from unix-like devices [on hold]

I have a odd issue on my network and I cannot understand it. My Windows hosts have no problem to browse the internet while my unix-like device cannot reach the gateway at all. The issue affects a ...
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0answers
36 views

How to connect to a service on a local network machine whch which only listens to localhost?

I have a service which only listens to localhost on port 7400. There is a service running on a windows and an ubuntu machine on a private network. How can another computer on the same network ...
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1answer
40 views

Simulate massive network traffic [on hold]

We want to stress test our pfsense box with a massive amount of connections and traffic. Right now we are using iperf, but reaching a number of more than ~300 parallel connections the test clients ...
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3answers
25k views

CentOS 6.5 not bringing up network interface automatically after reboot [ifup eth0]

I am having this issue with many of my CentOS servers where after a reboot the network interface fails to come up automatically. This is a big problem for me since I need to drive to the datacenter ...
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0answers
47 views

Running Apache2 in xenserver

I am trying to run my own squirrelmail email server. This involves the use of apache2, postfix, and squirrelmail. When I first boot up the server everything will work fine, but after about 1 - 2 ...
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3answers
78 views

IP forwarding on Linux

I have three machines Source Machine Destination Machine - IP 10.20.30.40 Intermediate Machine - Host server1.test.com Source machine has SSH access to Intermediate machine and Intermediate machine ...
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1answer
44 views

Ip addressing for serial routing

I have the following packet tracer diagram: I have range of ip address : 10.0.0.0 - 10.0.255.255 I need to assign ip addresses from this range to the routers' serial interfaces as well as subnet ...
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12 views

Network issue with VMs mixing dedicated public IP and port forwarding

I already have a virtual machine with its own public ip address and I would like to set up a new VM using port forwarding from the host. I have two public addresses: X.X.X.146 for the host Y.Y.Y.99 ...
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1answer
35 views

How calculate printer average-toner-coverage used per page using SNMP

I want to know the rage toner used per page, for example: for one page print was used x toner for other page print was uses 2X toner I suppose are some SNMP mibs/oids to do this; some idea ?
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22 views

Traceroute output - Asterisks

i m pretty new using this command. I run dualboot Linux / Windows on a pc, and i ve noticed the same output whether i m using traceroute on linux or tracert on windows. Can someone explain this to me, ...
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2answers
3k views

How can I configure my network to allow bi-directional traffic between two lans?

Here's my current setup: (and it may require reworking): 2 LAN networks - 192.168.41.0, 192.168.21.0 2 Public IP's (they are assigned to us by specifying MAC Addresses - not subnetted) ...
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0answers
34 views

What is wrong with my IKEv2 configuration, and how can I fix it?

I've attempted to set up an IKEv2 VPN on my DigitalOcean server following this guide. So far, I get a connection, but I can't seem to send any data through it at all. I'm not sure what's going on or ...
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1answer
29 views

One way network bridge

I have two networks, with a single machine sitting on both (two NICs) shown below. That machine is Linux. I was hoping to set up a bridge of some sort so that work stations on the 192.168.1.x ...
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0answers
34 views

How to determine optimal fiber cable length?

We are going to send several servers for colo in a datacenter where we got 20U space (half a cabinet). Our configuration includes 1x4U, 1x2U and 1x1U servers and 1U for a switch. They'll all be ...
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0answers
9 views

Configuration snort IDS

I have installed snort on my windows 7 machine. But during configuration of snort, it gives me the following error. ERROR: c:\Snort\etc\c:\Snort\rules\app-detect.rules(0> Unable to open rules ...
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1answer
32 views

How to share two ISP in two router configuration?

I have two router configured in lab. To configure network redundancy, I want to configure one ISP on each router. So if network on one router goes down, we will have the network connectivity from ...
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0answers
17 views

Changing the subnet of docker0 in Fedora Core 23 [on hold]

I'm setting myself up a new docker host and I wanted to configure the subnet / ip-range used for docker0. Unfortunately, it doesn't seem to be as simple as just changing the parameters in ...
0
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0answers
13 views

DNS forwarder to ingest client-subnet as EDNS option in outgoing query

I am looking for DNS forwarder able to apply following logic to forwarded queries: - If EDNS client-subnet option present in query from client, preserve it - Otherwise, calculate client-subnet from ...
0
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0answers
18 views

I'm having random nfs slow downs on my nfsv4 gigabit network which cause videos to slow down then speed up

I've noticed this issue happen in two different video players so I'm pretty sure it's a network problem. I'm running Ubuntu with the kernel 4.2.0-35-generic. Here is the result of my nfsstat -4 -s ...
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2answers
7k views

Which openvpn cipher should I use?

From both a performance and security standpoint, which cipher should I use with openvpn? According to http://openvpn.net/index.php/open-source/documentation/howto.html#security , the default is ...
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17 views

Issue with nfsen in fetching sflow data from Linux host

I have two VMs. The first VM is at AWS EC2 instance (red hat). I am using this system as sflow agent. I have installed hsflowd in this machine. My hsflowd.conf file looks like following: DNSSD = ...
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2answers
1k views

Configure 2 gateways ppp0 + eth0

I have a server serving at 0.0.0.0 (for all interfaces) And my machine has 2 connections one ethernet eth0 and other a ppp0 (3G card) First without the ppp0 connection active I have the following ...
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2answers
145 views

Why is fragmentation done on layer 3 (Network layer)? [on hold]

Why is fragmentation done on network layer and why not on other layers ? Fragmentation means splitting the packet into to small pieces and sent from source to destination. The maximum MTU size is ...
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0answers
43 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?