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

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No connectivity between azure VMs

In my azure environment, I have 4 VMsx running Windows Server 2012 R2 10.0.0.4 (AD, DNS) 10.0.0.5 (ADFS) 10.0.0.6 (MSSQLSERVER) 10.0.0.7 (IIS) All of the machines are connected by an azure virtual ...
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1answer
49 views

Need advices on iptables

Helly guys ! :-) . I need a (several?) advice(s) from you about my iptables setup. I'm pretty new to iptables, and this is the first time I configure a server with iptables ONLY as a firewall (we ...
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1answer
186 views

snort: drop icmp rule doesn't actually drop packets

I installed snort-2.9.7 from sources, and launch as IDS: % snort -devQ -A console -c /etc/snort/snort.conf -i eth0:eth1 Enabling inline operation Running in IDS mode ... The config file is very ...
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1answer
79 views

How to remove crypto-ransomware on my network domain

Today some computer on my domain got infected with crypto-ransomware and have infected some folders on file server that only some computers on network have access to. So I presume one or more of five ...
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0answers
43 views

VLAN configuration on HP J9279A

I've tried to set up separate VLAN for lab environment on one of my HP switches (J9279A/J9280A). Network schema: WAN | GW | ...
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1answer
92 views

Watchguard Mobile VPN with SSL - user can't connect - failed to open shared memory for openvpn command (error: 2)

I have a problem with my Watchguard VPN. I've set up the device for SSLVPN (added policies, users, a group etc.) according to this description from the Watchguard docs. The authentication itself ...
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0answers
38 views

Persistent error when installing windows server essentials in windows server 2012

I'm getting an error when trying to perform post installation configuration of windows server essentials in windows server 2012: An error occurred when installing Windows server essentials. Please try ...
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1answer
36 views

What exactly happens to packets written to a TUN/TAP device?

I'm trying to send packets to an application listening on eth0 from machine's user-space as if they were coming from a remote machine. What I can't seem to find good documentation for is the exact ...
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2answers
79 views

Rack Server Width

I am dabbling into the world of rack servers and trying to teach myself a thing or two. I have come to a roadblock about the width of a rack server, I have read that the standard width for a rack ...
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1answer
44 views

Routing on outgoing data packet in linux kernel? [closed]

I am currently studying iptables. So far all the articles and howtos I have found on google/duckduckgo has only ever mentioned routing on incoming packets (passing the INPUT och FORWARD chain). I find ...
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1answer
26 views

What is the purpose of the apache address binding?

Apache virtual host configuration files are wrapped in a container like so: <VirtualHost *:80> # # Virtual host config etc... # </VirtualHost> Where the * represents the ...
2
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1answer
52 views

Limited Connection - Network Issue

I'm having issues with a Windows Server 2012 - Dell PowerEdge R300. Every time the server restarts the network adapter gets limited connection and does not work. I have to locally disable the network ...
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0answers
68 views

Connect AWS and Azure via OpenVPN

I am trying to connect two networks (AWS and Azure) together via OpenVPN. I am aware of other implementations (OpenSwan+Azure GW etc.) but I need maximal portability as I will be expanding this to ...
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1answer
38 views

Performance Implications to Using a Full Class A Subnet

Let's say you have a small network (50-60 IPs) and assign everything a 10.x.x.x IP with a subnet of 255.0.0.0. This gives you a huge range of usable IPs. What performance implications will this have ...
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1answer
55 views

iptables and routing mechanics [closed]

At what stages of handling a data packet does the linux kernel apply the different iptables chains and routing? I am looking for a schematic overview of the process.
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2answers
88 views

router: ping fails at specific time for 40 seconds

my network looks like this: ISP cable --- ISP modem/router (2 in 1) \ \--- my router --- wifi connection --- computer 1 \----------- cable connection ...
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1answer
96 views

How to configure a bridge between two interfaces in Ubuntu server 14.04?

I am trying to configure a bridge between two interfaces em1 and em2 in Ubuntu server 14.04. This is my configuration: auto lo iface lo inet loopback auto em1 iface em1 inet dhcp auto em2 iface ...
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0answers
37 views

Determine is VPS is slow just through PING?

I'm running a severe issues on this site and I'm trying to see if the problem is at server side (just if VPS is slow or some kind of miss configuration) or software side (Wordpress). I'm not an expert ...
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0answers
69 views

Cisco DNS doctoring or Hairpinning?

I've the following configuration: CISCO 881, IOS 15.2(4)M6. On WAN interface is configured the 86.34.156.48/29 subnet from our ISP. Behind the router is staying 2 webserver. NAT: 86.34.156.51 <> ...
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0answers
71 views

Hyper-V guest VM disrupt host network connectivity

I'm experience strange connectivity issues on a Windows Server 2012 R2 Standard installation with installed Hyper-V role and one Server 2012 R2 guest machine. Whenever the Guest tries to access the ...
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5answers
62 views

Multiple Computers Running IIS with a Singular Public IP how to handle incoming communications?

At our company, we have three separate servers that house IIS currently. Each of these three servers have the same public IP address and essentially reside on the same network under different subnets. ...
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0answers
49 views

Forwarding traffic between interfaces inside a docker container

I have created a docker container executing the following command docker run -it --net=none --cap-add=NET_ADMIN --name firewall ubuntu /bin/bash after I have attached it two interfaces eth0 and ...
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1answer
38 views

OpenVPN all subnets the same, send a single client to tun0?

The two networks in question are listed here.. The wlan0 is on 10.0.0.23/24. tun0 (openvpn) is on 10.8.0.6 but is routing traffic to the network 10.0/16. So both wlan0, and perhaps tun0 could have ...
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0answers
42 views

Port Mirroring on Wireless router

I will be going on site to help hotel manager to identify who is using P2P (torrents) in hotel and abusing network usage for other guests. Easy option would be 1. Port Mirroring on wireless router ...
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0answers
28 views

Strange haproxy behaviour

So I'm trying to set up a dual site haproxy (1.5.10) on Ubuntu 14.04. http://i.stack.imgur.com/EtdYo.png When I do service heartbeat restart on eartha, both machines go green briefly; then earthb ...
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0answers
80 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. ...
0
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1answer
78 views

How to configure dynamic DNS updates when using stateless IPv6 addressing?

I am using Server 2012 with AD/DNS/DHCP. I have successfully configured stateful DHCPv6 however this does not accomplish what I would like to achieve so I disabled it and I'm currently trying to get ...
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1answer
42 views

Routing between two servers via a virtual interface

I have two servers, each running an openvpn service, the first one (uno) has the vpn range 10.170.0.0/16 tied to UDP 1194, and the second one (dos) has 10.180.0.0/16 tied to TCP 443. I would like to ...
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1answer
63 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 ...
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0answers
38 views

Connect DOS 6.22 Client to Wireless router USB Shared Drive

We have a DOS 6.22 client OS currently configured as NETBEUI. We would like to know if there are any wireless routers with a USB shared port for sharing files, that will allow a DOS 6.22 client to ...
0
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0answers
73 views

No connection from one Mac OS X workstation to Qnap TS-470 Pro NAS

We face a very strange problem which we are unable to debug ourselves. Suddenly one of our Mac OS X workstations (connection wirelessly to the network) was unable to connect to the Qnap TS-470 Pro NAS ...
1
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1answer
56 views

HyperV External Switch Multiple VMs

I'm quite new to hyperv and I am having problems setting up network access for my VMs. The host has two physical network ports and I've assigned one to an external virtual switch. I've then setup two ...
4
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1answer
62 views

Open Source Puppet for Network Devices

I'm attempting to determine whether I'd be able to run Puppet on network devices (switches, firewalls etc.). From what I can tell after reading online documentation, Puppet Enterprise will cater such ...
12
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1answer
562 views

Packet capture via cmd

I want to know if there is a tool that I can use to script out packet captures (command line) without having to install anything (and preferably not even pcap). This is for Windows machines; the tool ...
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0answers
22 views

Azure VM stopped communicating with other VM:s in same virtual network

We have three VM:s in an Azure Virtual Network: VM01 (Subnet 1) - 192.168.100.4 - Running SQL Server 2012 VM02 (Subnet 2) - 192.168.200.4 - Running IIS8 with WCF-service on port 8083 and ...
1
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1answer
43 views

AD Dynamic DNS not working with Linux IPv6

I have an AD DNS/DHCP enabled server. I have mixed Windows and Linux machines/servers. IPv4 is working great with DNS/DHCP, even for the Linux systems. IPv6 is working great except that it won't ...
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1answer
40 views

iptables - Redirect except list MAC Address

I'm using iptables on my router to redirect all web traffic to my page. But i don't know how to except my mac address list. I did command like this iptables -t nat -A PREROUTING -m mac ! ...
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1answer
44 views

how to determine client side or server side retransmission from a pcap

I am trying to get some clarification on something I read here: how to calculate packet loss from a binary TCPDUMP file The first answer says that the sequence number will be the same from client to ...
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1answer
47 views

Using a pfSense guest to firewall/route traffic for other guests

I was curious if this falls into the "why..." category or not. I have a dedicated, hardware UTM (Untangle) that's serving as an edge device with two hosts and a dozen guests behind it. Right now, I ...
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0answers
36 views

ClearOS route configuration not working. How to setup route-eth0 properly?

I am running a ProxMox Server with ClearOS as a VM. I have the following requirements: extIP 1.1.1.1 gateway 2.2.2.2 I can not get clearos to automatically add the required routes. Here is what my ...
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0answers
29 views

Lock custom APN

I need to lock APN settings of a Mobile Broadband Connection on a number of Windows 7, Windows 8 and Windows RT machines. We are using a custom APN and can't let users (no administrator rights) change ...
1
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1answer
25 views

Selecting a TCP stream with most bytes transferred in Wireshark

I have captured traffic in Wireshark and I want to follow the TCP stream with most bytes transferred in the traffic. After opening Statistics > Conversations and sorting by Bytes column I filter the ...
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0answers
24 views

Inconsistent speed with simultaneous FTP downloads from same server

I have a hosted VPS running CentOS and PureFTPd. When I try to download from multiple FTP accounts on the server simultaneously, I get wildly different speeds for each of the FTP connections: some are ...
0
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0answers
33 views

ATM connection has slow upload speed when connected to switch or router

We just got a new additional ATM line with 10/10 Mbps. When connected directly to a PC NIC, internet speed tests all come up as 10/10 Mbps. However, when connected to any of several routers or ...
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0answers
53 views

Setting up Infiniband network - wrong route

So I'm trying to set up an Infiniband network alongside my Ethernet network. I have 10 compute nodes and one conductor node. All 11 machines are running CentOS and are plugged in to an Infiniband ...
0
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1answer
24 views

MAC ID Binding to IP on Windows

Is there a way i can bind a certain IP to have traffic allowed if it has a certain MAC ID on windows routing and remote access or network policies? Basically Associated MAC ID to IP xxx.xxx.xxx.xxx ...
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0answers
30 views

Unable to traceroute on Amazon EC2 Ubuntu

I have setup a brandnew Ubuntu 14.04 instance, with a public IP, with a security groups that allows all inbound and outbound traffic using all protocols on all ports from/to any IP. I have installed ...
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1answer
53 views

Remove the unspecified gateway from linux routing table

I've a remote linux machine whose the routing table is : [root@hostname]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 ...
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109 views

Windows Server 2008 r2 clients can connect to AD but no Internet. Server connects to Internet fine

I've recently been assigned to manage a network at work. There are two labs (over 40 clients in total) connected to one Windows 2008 r2 server. Roles installed are as follows: Active Directory DNS ...
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2answers
46 views

AWS EC2 : No HTTP Traffic after reboot but SSH is ok

I have a small ami EC2 instance @ AWS. I had to reboot yesterday and after reboot, I couldn't access the websites hosted on the EC2 while there was no problem at all through SSH. Things I checked ...