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

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Softether on lxc container with bridged connection

I've configured an lxc container with softether. The lxc container has a bridge connection, so I have a LAN IP with my lxc container. Here's the IPs of my office: Router/DHCP Server: 192.168.1.1 ...
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1answer
560 views

Fast ARP scan in address-less DAD (Duplicate Address Discovery) mode

I am developing system for detecting network actual state. One part is to get all IPs and their respective MAC addresses. Right now I am using arping in DAD (Duplicate Address Discovery) mode. I send ...
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0answers
10 views

AWS EC2 instance is not accessible from time to time

I have instance in AWS EC2, that periodically (without any pattern) is getting not accessible from outside of AWS (I am using openVPNAS to get into subnet) but for most of cases it is accessible from ...
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4answers
12k views

Should a webserver in the DMZ be allowed to access MSSQL in the LAN?

This should be a very basic question and I tried to research it and couldn't find a solid answer. Say you have a web server in the DMZ and a MSSQL server in the LAN. IMO, and what I've always ...
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0answers
2 views

Program Can't Access Repository Through VPN

Having an issue with a VPN. The VPN is a basic PPTP VPN which is setup on our Firewall, for a user to connect the simply create a new VPN point it to our IP and log in with a username and password. ...
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0answers
7 views

TP Link mc220l loses (switches off) fiber connection

I'm using a fiber optic symmetric 1gbps internet and trying to use TP Link mc220l as media converter I came across an issue. Here are configurations that I've tested so far: isp - (fiber) - TP-Link ...
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0answers
4 views

Multiple WiFI Access Points

I have a site with multiple access points approx 50 of them. They are all in caravans. I have eight switches which are spread across the caravan park, there is three rows of caravans, and the 8 ...
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2answers
82 views

How to make a disconnected drive?

kind of a weird question but how do I make a drive go from a OK state to disconnected state using net use? I do not want to delete it. I am testing a script but the annoying thing is that to test the ...
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1answer
13 views

How can I force PostgreSQL to start after network is setup on Ubuntu Server 16?

PostgreSQL fails to bind socket because it starts before network is setup. I use Ubuntu Server 16.04.1 LTS and PostgreSQL 9.5. I have read many docs over the internet but nothing solved my problem. ...
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2answers
32 views

Nagios - external monitoring host without real connect - how do?

I've got a problem. I have a few external servers that need monitoring by Nagios, but they are in remote VPN networks. I must send monitoring data from vpn's host to Nagios who is working on public ...
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2answers
1k views

Wrong IP address registering in DNS

I've just taken over a small business network with 2 Windows servers. SRV2 (Server 2008 R2) is primarily a data backup for SRV1 (Server 2003); they're both DNS servers as well. Our primary LAN ...
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1answer
1k views

vmware esxi host ha state in election

In my Vmware Esxi server 5.1 , 2 host machines which are added as cluster ,there HA state is turned to ELection .I tried Reconfiguring the vsphere for HA it is not working .In cluster it shows issue ...
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2answers
5k views

Mikrotik simple queue, Limiting range of IPs

I'm using a Mikrtotik RB201UiAS to manage my network. To avoid creating simple queues for every IP i have created queues for ranges of IPs. Target: 172.16.2.0/25 Dst: ...
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0answers
27 views

Is there a way for services like whatsapp to make their service block-proof? [on hold]

With governments constantly blocking services like whatsapp and the like, I'm curious to know if there's a way for these services to bypass these restrictions. In particular, is it possible to do some ...
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3answers
1k views

ping and traceroute does not work when UFW deny outgoing by default

How to make ping and traceroute work after setting UFW with deny outgoing by default? Here is my UFW configuration: sudo ufw status verbose Status: active Logging: on (low) Default: deny (incoming), ...
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1answer
11 views

DHCP/Gateway done by pfSense Virtual Machine to physical network

I have an ESXi host server that has a pfSense virtual machine within it. The VM is acting as a DHCP Server / Gateway to an internal vSwitch that is within that ESXi host. If I use a physical NIC on ...
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4answers
49 views

CentOS extremely slow DNS lookup

For some reason, two of my machines have started suffering from extremely slow DNS lookups. Sample timed output of 'host' command: [root@ns507403 ~]# time host www.google.com www.google.com has ...
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0answers
11 views

How to create local subdomain using avahi

I have Debian based server that starts a web page in local network. Avahi is set up with hostname "name.local" and it can be opened from Linux and Windows. I want to add subdomain to it to have "...
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5answers
27k views

Docker containers can't resolve DNS on Ubuntu 14.04 Desktop Host

I'm running into a problem with my Docker containers on Ubuntu 14.04 LTS. Docker worked fine for two days, and then suddenly I lost all network connectivity inside my containers. The error output ...
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0answers
11 views

Monitor my hom network with my DD-WRT / RFlow [on hold]

I would like to see what is going on with my network! I do not want to see the content of the traffic , all I need is: time source, destination, protocol, App (Viber, Skype, Line, ....) how I can ...
2
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2answers
128 views

difference em0, em1, bge0 - pfsense

While assign interface in pfsense I found three interfaces em0, em1, bge0. I assigned bge0 for WAN and em1 for LAN. it worked. but honestly I don't know what is the exact difference between these ...
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0answers
6 views

Socks/HTTP proxy over pptp without default route over pptp [on hold]

I have the following setup: My machine is a Raspberry Pi running Raspbian. Should this setup work it'll be moved to a different *nix machine later on. A pptp VPN connection named ppp0 and on the ...
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2answers
12k views

Lost connection to MySQL server at 'reading initial communication packet', system error: 0 with windows

I found similar questions but none of them helped me with a windows machine. I originally posted this on stack overflow but it was suggested that I ask here. I was able to connect to mySQL through my ...
2
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1answer
26 views

Connection speed between blades

a local company sponsored our university a bladecenter (HP c7000) equipped with 16 HP c460 blades. Our main issue is, that we don't know at which network speed the blades talk to each other. Our goal ...
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6answers
7k views

Windows Server 2012 R2 performance for Mac OS X Clients (File Services)

I am inheriting a Windows 2012 R2 Server that is experiencing abysmal SMB/CIFS performance for Mac OS X Clients in particular. The server is doing file services and is an Active Directory Domain ...
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1answer
1k views

For a switch using RSTP (or MSTP) on which port states/roles does it send BPDUs?

In trying to wrap my head around MSTP and RSTP I have read conflicting information about which ports a switch will send BPDUs through. It is clear to me that for MSTP the switch sends the BPDUs needed ...
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0answers
18 views

(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
18 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
2k views

snort complains on local.rules

I just installed snort-2.9.7.0 on Fedora 20, and am getting error when running: % snort -c /etc/snort/snort.conf --dump-dynamic-rules=/tmp Running in Rule Dump mode --== Initializing Snort ==...
0
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1answer
311 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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2answers
2k views

Unable to access different subnet

Router ip: 192.168.3.1 Windows server: 192.168.3.50 (WLan) and 192.168.2.1 (LAN) PCs: 192.168.2.x I am able to access 192.168.3.50 from laptop (in 3.x network) but unable to access through other ...
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1answer
35 views

Ubuntu LAMP server disconnects after some time

I am trying to move my websites from shared hosting to the vps I rented, so I am trying to set up LAMP stack. After installing all, the server works fine at start, when I visit it's IP address on ...
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1answer
48 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
23 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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1answer
27 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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0answers
12 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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2answers
1k views

how to get ip address of a PPP(Point-to-Point Protocol) network interface?

I have a Linux machine with two network interfaces, and I'd like to get the IP address of the PPP interface w1g1 but it doesn't show up in ifconfig. There is a public IP on the PPP interface, but ...
4
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0answers
71 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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2answers
1k views

Traceroute doesn't reach gateway

I have problem with my openSUSE 11.3 network. So, I've assigned IP address 192.168.137.2 to it, and another computer (Windows 7) with IP address 192.168.137.1. On the openSUSE, the gateway is the 192....
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votes
1answer
26 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 ...
2
votes
2answers
3k views

Juniper SSG5 DHCP IP Pool is full. Unable to offer IP address to client

hope we have some Juniper guys around, I have configured a Juniper SSG5 as our main firewall/router the DHCP server set on interface bgroup1 to have a rang from 10.10.10.76 to 10.10.10.210 All ...
14
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9answers
52k views

How to tell if it's your problem or your ISP's problem

I originally titled this "how to tell if your internet is down or your network is just screwed up" and Jeff's AI said that this questioned would probably be closed. Nevertheless, someone here is ...
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votes
1answer
27 views

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

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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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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0answers
20 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
7
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2answers
8k views

HP ProCurve 2920 switch stack topology for TWO switches? Ring vs. Chain vs. trunk?

I have a customer whose two HP ProCurve 2910al PoE switches have failed. This was backing a VoIP deployment for a small call center. They are interested in replacement PoE switches, but there's a ...
2
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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 ...
2
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1answer
84 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 ...
-1
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1answer
28 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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0answers
16 views

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

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 ...