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

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(D)DoS Detection within linux and IPTables

We currently have a hardware firewall running on Ubuntu 14.04 on a 10Ge network. We use this to filter traffic and attacks, this is all working great and we have blocked quite a lot of DNS/NTP attacks....
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1answer
9 views

How to debug a “connection refused” error with tshark?

I'm trying to establish a simple TCP connection between two machines in the same subnet (wireless network). The tool used is netcat. On machine A, I start a listener: nc -l -p 4506 On machine B, I ...
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1answer
36 views

how to make sure modem is truly in bridge mode

I need public ip in pfsense wan interface so I configure my adsl modem as bridge mode But I have little doubt on this "it is truly in bridge mode". What are the steps to make sure about bridge mode ...
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0answers
11 views

Do UDP process in netstat-ano command means being hacked? [on hold]

If yes how to stop them permanently.. I am getting these pid's for svchost.exe process whwn i check in task manager Checking for pid(process id ) again and again is not good
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42 views

Higher TCP latencies in the latest versions of Linux

In my research group, we recently upgraded the OS on our machines from Red Hat 6.2 to Debian 8.3 and observed that the TCP round trip time through the integrated Intel 1G NICs between our machines had ...
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1answer
23 views

Access shared files between two vlans using a local server

I am very new to networking. I have two VLANs, and want to read and transfer shared files between them. I cannot add a new router. I have access to a server which can be accessed by both the VLANs ...
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7 views

Exception AttributeError related to kickstart file- Unable to network boot Centos via Cobbler

I'm trying to install CentOS7 via Cobbler. I've created a new Kickstart file, although I've taken many of the lines from another Kickstart file for a different server. I'm getting the following error ...
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0answers
7 views

Is there any procedure for soft deleting interfaces in free bsd 8.3?

Is there any procedure for soft deleting interfaces in freebsd 8.3?My one of freebsd interface is showing status as " No carrier".I checked everything possible and is still showing same status....
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1answer
27 views

How to get Specs for all systems on a network? [on hold]

I have started working in a network of 50+ Computers, most of them vary in terms of specs, some have 64gb of Ram other have 24gb, some have nvidia gpus others have Raedons, Parts are swapped and ...
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20 views

Network-Wide Process Communication/Coordination

I am looking for a way to connect processes on multiple systems in potentially multiple locations. An event bus or message queue seems the ideal way to do this, but I have not been able to find an ...
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0answers
19 views

Wan ip always 0.0.0.0 after set bridge mode

I try to set my my modem(unnanti A-300M) as Bridge Mode (set eventhing as a default), After getting wan addr is 0.0.0.0. Easy for your reference note: unnanti A-300M = Modem + Router
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1answer
22 views

WIndows is not following TcpAckFrequency settings

This is a wierd one. I have set the tcpackfrequency to 2 and windows does not seem to honor it no matter what I do. I would need your help with this. My current template is Internet and congestion ...
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0answers
14 views

ASUS RT-N66R won't allow port forwarding of 80 [on hold]

Has anyone else tried to port forward outside port 80 to inside port 80 on an ASUS RT-N66R? I just spent 3 hours trying to get a new web server functioning from the internet (which I've done quite a ...
-3
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0answers
27 views

Route between two private networks [on hold]

I have a two private networks (home: 192.168.1.0/24 and virtual: 10.10.0.0/24) which I like to connect and have them to be reachable in both ways. Network home is managed by my home router which is ...
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1answer
27 views

I cannot determine hostname of remote machine, but my local DHCP server can [on hold]

I have 3 devices in my network - my PC and 2 self-made devices. My PC serves as DHCP server for devices. All this is connected via ethernet and switch. DHCP server shows valid hostnames of devices: ...
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1answer
40 views

Routing external traffic to a backup datacenter

I'm planning a backup data center and want all external hosts to transparently connect to DC2 if DC1 goes down. Assume I have public ip 1.1.1.1 at DC1, and public ip 2.2.2.2 at DC2. Obviously if ...
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1answer
217 views

How is Elastic Beanstalk forwarding traffic on port 80 to my app at port 8080 without nginx/apache?

This is the weirdest thing ever. I've configured my AWS Elastic Beanstalk environment's proxy server setting to none instead of nginx or apache, to reduce the server overhead, and since I don't need ...
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0answers
13 views

Frequent “socket timeout after 10 seconds” service alerts with check_mk on check_http checks - how to debug?

I've set up a monitoring server with Check_MK Raw Edition on Ubuntu 14.04 Server. It doesn't really check a lot of services. There are currently 5 servers (that also use Ubuntu 14.04 Server as OS) ...
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0answers
20 views

Tools for automated network device discovery and config? [on hold]

Two weeks into a new job, I've just spent far too long on the shop-floor manually configuring and troubleshooting one of $company's products ready for shipment. We produce products which, for the ...
0
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1answer
17 views

smb prompting me for root password?

I issued the command: sudo smbclient -L //serverXYZ to list the shares on a remote Windows server on the network and Ubuntu system asked me first for my password (I am a sudoer), then it asked ...
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23 views

How to resolve Linux web server lost network pockets

My website is hosted on a Ubuntu web server. The web server is installed on VMware from the win server 2012. Server and web server are in same subnet, 20.235.*.*. Yesterday I restarted the web ...
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1answer
20 views

How to deal with a short in a cat 5e cable [on hold]

I am in the process of cleaning up my cables and as part of it testing all connections. One cat5e wire that snakes thru the walls and I can NOT replace as it's not going to pull around the bends, is ...
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1answer
12 views

vSphere - Virtual Network Device Issue

So I have network monitoring at our business and since we have been monitoring I have noticed massive spikes on one of our core switches in particular -it is causing our internal network to slow down. ...
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5 views

Connecting 2 servers with QLogic BCM57810

I'm experimenting with different ways of connecting 2 servers together I already have 2 Qlogic BCM57810 and Avago AFBR-709SMZ along with some fiber patch leads. This is my first time playing around ...
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25 views

Ubuntu virtual machine (hosted on Windows) only connecting to google, facebook, etc [on hold]

I was setting up GitLab and Gerrit servers for my company on a virtual image of Ubuntu when at some point (not sure what I did), I was unable to connect to the internet (besides google, facebook, and ...
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20 views

What and How should be network design for 5 floor building? [duplicate]

5 Floors. 1st floor-185 nodes, 2nd floor-160 nodes, 3rd floor-340 nodes, 4th floor-100 nodes. My server Room is on Third Floor. Plz help me to find my network should be distributed with hub room at ...
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2answers
29 views

Internal network can't see mailserver on public ip address Mikrotik

Please esxcuse my english as it is not my home language I have mailserver in my network behind a mikrotik router and firewall the problem that I'm having is that my mailserver is on a public ip ...
2
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1answer
72 views

How to troubleshoot a MAC flapping between switch ports. (Cisco)

I'm working on a rather small Layer 2 network segment that contains a physical loop. (I have included a picture of the topology below). The core switches are stacked 3850s. The other switches are ...
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1answer
27 views

What's the legit use of a deauthentication packet?

Most people that have tampered with external wireless networks in a malicious fashion for the sake of education (hopefully your own personal testing network) have probably heard of a deauthentication ...
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0answers
22 views

What is the purpose of a “static LACP” trunk group on HP switches?

I'm in the process of educating myself regarding configuring aggregated links on HP ProCurve switches. Looking at non-vendor-specific documentation regarding link aggregation, the defining ...
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0answers
15 views

Windows 7, 64 bit, Office 2013 [closed]

July 2016 - I got Cisco Any Connect Secure Mobility Client v 4.2.03013 pushed on us at work. We have Windows 7 64 bit. This is causing us to loose all network connectivity. This is not my strength so ...
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1answer
10 views

Bridging host-only subnet on multiple Dom0s

I currently have two XEN-Hosts running a set of virtual machines. These machines can communicate with each other via a host-only network. I want to be able to move virtual machines between both ...
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2answers
43 views

What is the benefit of the port portion of the “Host” header in HTTP/1.1?

Can anyone explain what is the benefit of the port portion of the "Host" header in HTTP/1.1? Is it so that we can have two or more websites with the same names (but different ports)?
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22 views

Have Internet access but no Ping [closed]

l am running a VM with Centos 7 on my windows7 machine . The problem is i can't ping to any network but i have internet access on my machine. Also my network status on VM shows: Failed to start LSB:...
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2answers
44 views

How to count the number of SYN, ACK, or SYN-ACK in a second? [closed]

I want to make a DDoS SYN Flood Detection, so i need to count the number of SYN, ACK, or SYN-ACK packet per second.
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29 views

Diagnosing slow server networking

So, I have 3 servers all networking together to run a single high traffic website all of which use Cloudflare for reverse proxy purposes. Two are webservers (which are identical) and one is a ...
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10 views

Can't access server after editing network interfaces during openstack installation

I was following the instructions at http://www.tecmint.com/openstack-networking-guide/ to configure openstack networking for openstack interfaces. I found I had two network card files, I edited the ...
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33 views

libvirt IPv6 Guest can't connect outside of the Host

i am trying to get a address from my IPv6-Subnet working in a Virtual Machine(libvirt, qemu). IPv4 over nat works like a charm. The host is a Debian 8.5 with qemu 1.2.9 and a 4.6.3-1~bpo8+1 (2016-07-...
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0answers
9 views

Freesco cant ping other machines [closed]

Im having some trouble with setting up Freesco on my VMworkstation, hoping someone can help.. I have a freesco VM with 3 NICS NIC 1 - Bridged with host 192.168.0.2 255.255.255.0 GW 192.168.0.1 (my ...
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14 views

CISCO: Use Specific Outbound IP For Locally Initiated NAT-ed Connections

I have a CISCO 2911 router, multiple public IPs and few servers. I have setup my router (ROUTER1) to be accessible through internet-accessible public IP (lets say) 190.0.0.250 and its local IP to 10....
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1answer
9 views

Accessing to a remote PostgreSQL server using port forwarding to another machine

I try to access to a Server_A on which PostgreSQL is running. This server is on a local network, that's why I have to forward port from Server_B which is accessible and in the same network. To access ...
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0answers
12 views

Access Home Network from an External IP Address [closed]

So I'm tapping into the PhilipsHue API to turn on/off. However, I can only do this on my home's internal network and so I want to be able to access it from the outside so here is what I tried after ...
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1answer
43 views

Is it necessary to include “Connection: Keep-Alive” in the response message?

Based on my understanding, a server uses the Connection: Keep-Alive header in the response message to tell the client that it will not close the connection after sending the response message. But is ...
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0answers
8 views

How is MAC address loaded to ip stack in kernel? [closed]

I am now trying to find out how MAC address of network device is loaded to kernel. OS I am using is Cent OS 6.8 64 bit . I see that whenever device is inserted , kernel automatically recognizes the ...
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1answer
59 views

What does “Connection: close” means when used in the response message?

When the client uses the Connection: close header in the request message, this means that it wants the server to close the connection after sending the response message. I thought that this header is ...
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1answer
44 views

how to ping ipv6 neighbor with global scope address [closed]

I have 3 virtual machines. (VyOS router, 2 x Ubuntu 14.04). VyOS advertised some prefix 2001:DB8:0:1234::/64. Now my ubuntu hosts have two ipv6 addresses: ubuntu 1: link-local scope: fe80::1111:...
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1answer
40 views

can't connect to couchdb remotely

I am trying to connect to Couchdb remotely, however, I just get Unable to connect . I can ssh into the server (actually just a Raspberry pi currently) through an ASUS router. netstat -an | ...
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35 views

How to forward traffic from A to B on the default gateway for sniff? [closed]

I have the following devices: A laptop (192.168.1.128) A Linux box (192.168.1.156) A router running OpenWRT(also the default gateway for the LAN) (192.168.1.1) Now I want to achieve the following: ...
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17 views

CentOS/RHEL Limit Bandwidth to specific IP

The scenario: We have a file server (local1). local1 is directly internet connected (no router/firewall in front). We have several remote VPS nodes (remote1,remote2,remote3). We use UDP (udt-...
3
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1answer
103 views

When wouldn't an ARP reply be generated?

Summary of the problem: a ping from client does not go to rpi1, its ARP call is not answerd at srv. host0and tap0 are bridged by br0. vpninand lan0 are two independent interfaces. All traffic ...