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

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Lags on a specific Windows 10 installation over MS VPN

I have a Windows 10 machine that is connected over MS VPN to a company intranet. All traffic to this company intranet and to the internet go over the VPN. When using remote desktop over the VPN the ...
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30 views

Network layout advice needed

I have been doing some research, I keep reading about source guard on Cisco for segregating subnets and only allowing certain ports access to an IP Address range. However, I don't use Cisco switches, ...
2
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1answer
70 views

Pinging Hostname results in reply from 2 different IP addresses

I have an odd behaviour on my Windows 2008 R2 server, when I ping a hostname of another system, my first reply has a different IP address then the following replies. For example, if I was to ping ...
2
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0answers
33 views

Ubuntu Network Performance on over 2k connections

I'm using an EC2 c3.8xlarge Ubuntu 14.04 LTS machine with over 3k threads simultaneously downloading web pages one after another. Although this machine should have a 10Gb network performance, I ...
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0answers
37 views

How to use an IPv6 Edge router in an IPv4 network?

Background I have the following set-up: I use 6LOWPAN (IPv6 implementation in IEEE 802.15.4) on my sensor link that have IPv6 addresses (stateless) as aaaa::xx/64 It uses RaspberryPi (RPI) as an ...
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1answer
23 views

Need some clarification on a NIC functionality on a Dell Poweredge r610

Quick question. I'm trying to understand the NIC functionality of this server. NIC specs from manual: My question is, do the two broadcom controller chips provide fail-over redundancy? For example, ...
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12 views

Dell R710/C1100 For a Rendering Farm? [closed]

I own a data center in Los Angeles and have an abundance of Dell R710 and C1100's that I have been renting as dedicated servers. I would like to deploy a rendering farm here as well. From what I have ...
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1answer
50 views

port listening in netstat can't telnet

I'm trying to connect to port 8020 on a CentOS vm but I'm getting telnet: connect to address <public_ip>: Connection refused when I run telnet public_ip 8020. When I run netstat -anp | grep 8020 ...
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22 views

IP Address and Dom0 IP Address

What is the difference between normal IP address and Dom0 IP address? As far as I read so far, Dom0 IP is associated with VMs instances but I want to know if it there is a subtle difference here.
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1answer
28 views

port forwarding by iptables failed

I hope to forward from 192.168.1.230:9090 to 192.168.1.231:8080. I execute the following command: iptables -t nat -A PREROUTING -d 192.168.1.230 -p tcp --dport 9090 -j DNAT --to 192.168.1.231:8080 ...
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2answers
56 views

Azure Virtual Machine can't serve websites

I am unable to get an Azure VM running Windows Server 2012 to serve up the IIS default website from it's public static IP. Created a VM running Win Server 2012 R2 and installed web server role. ...
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1answer
43 views

First ping (to any destination) fails from switch but not from router

I've got a basic network setup, just doing NAT to a single public address to an internal /24 without any VLAN's or fancy routing. Both my router and switch are running Cisco IOS 12.x. My ...
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7 views

How can I create separate/isolated regions on a home network? [migrated]

I currently have a flat network at home. My boradband router comes in and is connected to a switch, which supplies the Ethernet drops within the house. I also have a wireless router connected to the ...
0
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1answer
16 views

How to let FreeBSD get IP address automatically in VMware?

I use FreeBSD 10.2 VM image in VMware workstation. Although I set bridge mode in VMware: I find the OS can't get an valid IP address: How can I let FreeBSD get IP address automatically in VM?
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41 views

Set default route to virtual ip

I have a Virtual private cloud running on 10.0.0.x. In this network two machines share a virtual ip to provide HA and connection to the internet via aaa.bbb.ccc.164. There configs are: Proxy1: ...
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1answer
31 views

Network Drives reappearing over and over

At the beginning we use a Startup-scipt to map 3 Network-Drives: M,Q,S using net use. (Unknown, if /persist has been used) Later, the logon script has been removed, the mapping has been relocated to ...
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1answer
50 views

Dumping command output from SSH session to procurve

I am trying to get information from the command "show mac-address" out of a collection of 12 procurve switches in 2 different locations all connected via fiber PTP. I want to import this into SQL for ...
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0answers
29 views

Is there a single Linux commandline tool that displays network connections AND processes

Bascially, I'm looking for a combination of iftop and nethogs in a single tool. iftop shows information on the network layer: source/destination target and ports, throughput and all that in a nice ...
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20 views

pfSense Killing Uploads to Any Wordpress Site

I am running a pfSense firewall on version 2.2.6. As far as I remember I have had working rules and have not had any issues uploading to my wordpress sites until this last upgrade. If I try to upload ...
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17 views

Amazon EC2 losing connectivity every day

Didn't find anything wrong on logs but my instance remains losing connectivity every day. According to AWS Console it's running fine but can't access through ssh or http. It resolves after rebooting ...
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1answer
39 views

Windows Server with Router in the same network, How to configure?

I have a network with Router that provide DHCP and DNS services to my network. Also, i have a windows server 2008R2 in the same network. I have +100 computers in the network, some must join the ...
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26 views

ubuntu: add 1000 ipv6 addresses on if-up

I'm trying to configure 1,000 IPv6 addresses using if-up.d. However, when the server is rebooted, they aren't configured properly and eth0 isn't up, even though I'm still able to connect to the server ...
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1answer
19 views

CentOS7 Network Bridge Fails on boot until cable unplugged and plugged back in

I have a problem with a brand new CentOS 7 server I am trying to set-up. I have set-up a network bridge as per instructions on the redhat documentation website and it all works great until I reboot. ...
2
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1answer
16 views

How to properly configure a classless reverse zone in BIND 9

I'm trying to configure reverse DNS for a sub Class C block. My ISP has delegated 128/25.2.0.192.in-addr.arpa. I've spent a good few hours reading everything I can find on classless reverse map ...
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1answer
30 views

How to check if promiscuous mode is enabled on network interface in windows server 2012 R2

I'm working with basic windump commands. After I close the windump, my pc is slowly and cpu range is high. How to check if promiscuous mode is enabled on network interface in windows server 2012 R2.
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4 views

How can a WiFi router recognize MAC address change of a connected device? [migrated]

My teen son and I are playing a hacking game. I've installed an WiFi router with parental controls, MAC filtering, VPN, etc. I block Internet for him, he tries to break out of the cage (for now I'm ...
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45 views

Why is CentOS 7 ignoring NETMASK?

I have a networking issue that I eventually tracked down to an incorrect network prefix setting. ip addr is reporting that the current prefix is /8 when it should be /24. However, when I look in ...
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1answer
36 views

What initiates parsing of the /etc/sysconfig/network-scripts/ifcfg-* interface scripts?

I have been searching for a while and looking at source code and various scripts on the Linux filesystem and still have been unable to figure out what ultimately initiates the reading of the scripts ...
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1answer
17 views

How to connect to ftp server from within LAN when the router port-forwards external connection away from it

Sorry for the long question. What it means is this: I am managing a small LAN that is protected by a router. router 192.168.1.1 server 192.168.1.9 client 192.168.1.2 client ...
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1answer
33 views

Setting up LAN at conference network

I have a customer that will be going to a conference. They have apache application installed on one of the machines but will need to access it from another machine. Normally this isn't an issue when ...
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1answer
19 views

Multihomed Windows 2008 R2 outgoing connection

I have Windows 2008 R2 Server with several directly connected networks and interface with default route to the Internet. Today I noticed (and then checked with Wireshark), that if I make request to ...
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18 views

SNMP OID mappings

I am trying to get ifDescr and ifHCInOctets OID from my pfsense firewall. When I issue a Get from snmpwalk: snmpwalk -v 2c -c xxxxx 10.1.0.41 .1.3.6.1.2.1.2.2.1.2 I receive the following output: ...
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1answer
15 views

HP 2530: multiple management IP Addresses possible?

I have two HP 2530 switches in our hosting center. Because of some VPN problems between our office and the HC, i need to change their management IP Addresses to a different IP network. Currently they ...
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1answer
22 views

Unable to connect to a port from a remote machine in Centos?

I am not able to connect to 9423 port of a machine from another machine though the local telnet localhost 9423 works. Here is my netstat -putna. Is there anything suspicious? 10000 works just fine ...
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16 views

direct connect (back-to-back) two servers with 82599ES SFP+ NIC

I want to connect two linux-server directly without a switch, using two Intel based 82599ES X520-2 SFP+ cards. On both sides there are FTLX8571D3BCV-IT transceivers (1GB/10GB, SR). If I connect each ...
2
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2answers
267 views

Cannot ping remote server; how can I debug local networking misconfiguration vs my IP is blocked?

I manage a KVM VPS at 104.143.14.103 that for some reason cannot reach http://pecl.php.net. When I ping the IP address of the PECL server (104.236.228.160), to make sure that it isn't a DNS problem, ...
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1answer
22 views

SMTP network ACL on AWS

I have a very restricted ACL for my VPC. We have a public subnet and a private subnet, each subnet has its own individual ACL. What I don't understand is why the following ACL works for sending email ...
2
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2answers
41 views

How do I move vCenter Server Appliance to a vDS?

I am trying to migrate both the only vCSA and the VMKernel interface in my ESXi host from a standard vSwitch to a vDS, and that gave me all kinds of mess. How to do that properly? Bear in mind that ...
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30 views

How do I use OpenVPN as an appliance in Azure to access protected resources?

I've been successful in creating a Virtual Network, adding subnets and security groups to different levels of our infrastructure, and installing OpenVPN on a VM and establishing a connection to it ...
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1answer
19 views

What is “full bi-section bandwidth” on AWS

Could somebody explain the concept "full bi-section bandwidth" in the context of AWS? I've seen the term mentioned in several places (Placement Groups, VPC peering). Say, I launch four c4.8xlarge (10 ...
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0answers
13 views

FritzBox 7390: Too low download bandwidth [migrated]

A few weeks ago, I switched to a faster internet plan. Before the change, I had 6 MBit/s, now I should have 18 MBit/s. However my download has not become faster. My router is an AVM FritzBox 7390. I ...
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1answer
25 views

Combine multiple root server to private network

we have a 4 root (dedicated) servers (no virtual servers/vservers, full hardware servers with asus mainboards and 6 real Intel cores) running Debian hosted by another company and standing in their ...
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4 views

Vmware guests high ping times [migrated]

My host server is Debian 7 running Vmware Workstation 12 PRO. I experience high ping times sometimes to guests: 64 bytes from 10.0.0.50: icmp_req=2198 ttl=64 time=0.255 ms 64 bytes from 10.0.0.50: ...
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1answer
32 views

Intermitent connection issues inside LXC

I am experiencing connection issues inside a LXC that are driving me mad. They are intermitent. They appear during some time, and they suddenly disapear. Scenario A lxc inside a host. Both are ...
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30 views

Is it normal to have unstable ping on local AP

I am about 1 or 2 level better than newbie in networking so i hope i didn't say anything wrong, except for my english. I have AP, TP-LINK TD-W8951ND that connected with ADSL. MY PC1 connected by ...
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12 views

rs232/console hub on a budget

For our office HW lab I am building single point of management of all HW elements that require console connection (firewalls, routers, switches etc) Since I am challenged to keep the budget low I ...
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1answer
32 views

Asterisk server with two connections [closed]

I need that configuartion It works, but with only one connection, with eth0 Or with only mobile broadband I searched for it, but found only forwardind/routing solutions. How i can see asterisk ...
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0answers
13 views

Why can't I disable routing/route or ndp on OmniOS? (Illumos)

I'm trying to harden this server and eliminate unused processes. I've been reviewing the output of netstat -a and see several entries under UDP and TCP with State LISTEN. I've disabled most of the ...
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2answers
43 views

How to know the external ip address of my gateway?

In my office network i unknowingly changed a setting of my gateway of lan network .. I had set my phone's ip address under a section in setting which states that.. Only this ip can login to the ...
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9 views

Another get pfctl equivalent of iptables, use ipfw or pfctl?

I'm trying to get the OS X equivalent of this iptables usage: sudo iptables -t nat -A OUTPUT -p tcp -m owner ! --uid-owner mitm_account --dport 80 -j REDIRECT --to-port 9001 But having a really ...