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

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PPTPD VPN Can't connect to the internet

I'm running a Ubuntu 16.04 Server on a VMWare ESXI Server with its own public IP, I have setup a pptpd vpn server which works but only with connected devices. I can't connect to the internet with it ...
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1answer
51 views

Network maps, best admin practises and how them saved your ass?

I am reviewing the security of a (quite large) network. There are a some thousands switches, several hundred routers, several hundred access points, tenths of FW, IPS, and so on. PCs and servers are ...
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1answer
74 views

How to secure dual-homed Windows Servers that are connected to the internet

We have two machines running windows server 2012. Both have one NIC port connected to the public internet and another NIC port connected to a switch with internal IPs (192.168...). What is the most ...
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3answers
50 views

VisualSVN server visible on internet, but not all subcommands work on client

So my boss is a nice guy who's open to trying new ideas, and I talked him into letting me start new projects on svn (instead of an older version control system). At this time, we've realized that it's ...
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1answer
36 views

Can I create an Ad-Hoc network between NAT virtual machines and computers/virtual-machines external to host? [closed]

I want to create a network between virtual machines on my laptop which are running Windows Server and other virtual machines in another laptop that will be running Windows Server as well without using ...
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1answer
218 views

Huge performance penalty in gbit link with ip forwarding / masquerade through clear VPN tunnel

I have a problem with IP forwarding between my home computer and a remote server (from online.net). My home connection is a 1 Gbit/s FTTH and the remote server has a 2.5 Gbit/s bandwidth. The context ...
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0answers
28 views

Set-up VPN using DD-WRT router

I'm trying to set-up a VPN with a DD-WRT router in a Windows 2012 environment. I followed the steps from DD-WRT wiki 2, but I can't manage a connection. Firmware: DD-WRT v3.0-r28788 std (01/13/16) ...
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1answer
61 views

duplex affecting bandwidth test, router--switch--NIC

Netgear FVS336gv3 router, 50x50 dedicated fiber. ISP instructed us to set WAN port speed to 100mbps full duplex; done. Router connected to Netgear GS748T 48-port switch. GS748T port set to "auto" ...
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0answers
19 views

GNS3 - Connecting Emulalated IOS to TWO PHYSICAL networks

I have a CISCO c3725 router on GNS3 connected to two different and separate unique LANs via the CLOUD/HOST icon, attaching each of the virtual CISCO c3725 to my computer's physical NIC (NIC 1 and NI2.)...
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0answers
48 views

linux veth use existing peer interface

I have a sit tunnel interface which I want to transparently connect with one end of a veth pair so that everything that drops out of the tunnel interface flows through the veth interface and vice ...
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3answers
43 views

Override AWS Auto-assign Public IP settings after instance launch

There is a limit to 5 public IP addresses (Elastic IPs) for each AWS Account and I have reached such limit. Now I have many EC2 instances created without the "Auto-assign Public IP" attribute, which ...
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34 views

Ubuntu 16.04 LXD No any communication between guests and master

Welcome. I had a little problem with my LXD server. On my master I have some guests systems (ubuntu 16.04 image), all of them are bridged to master and are in my local subnet at home, and have an ...
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0answers
21 views

Can't reach centos server after “Multicast listener report” IPV6

I ran into a problem that occurs only on a few servers. Every 5-6 minutes I lose connection to the server, and it get backs after a few minutes. In most cases it's a VM that is not reachable while ...
1
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2answers
54 views

Debian / IPv6: Default route expires after 1800 secs, loosing connectivity

I'm running Debian 8 on a vServer. After installing docker and enabling IPv6 i noted something strange. I don't know if docker has anything to do with this, it's just that i noticed this problem after ...
2
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0answers
113 views

How to verify network quality before running important benchmarks?

I have multiple CentOS servers around the world. They all are running a PHP script that tests the latency of some services once per minute. The problem is that sometimes these servers have local ...
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1answer
21 views

DHCPv6 CONFIRM message in Linux

I'm testing DHCPv6 client. One of the tasks I need to check is if the CONFIRM message is sent as described in RFC (if it occurs in specified timeout). I know that this message is sent to be sure if it ...
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2answers
29 views

Software to Detect Device Missing from Network?

I have several small Android tablets that I am going to deploy in a manufacturing environment. Each one will be assigned to an individual, but I'd still like to have some way of detecting if the ...
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0answers
16 views

Checking RadHuntGroup And Radgroupcheck to login specific NAS

I am actually setting up a FreeRADIUS Version 2.1.12, server that will manage authentication Users Cisco Switchs in company .. and i have one problem : I need to create some accounts that can be ...
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0answers
22 views

Bridge not functioning as expected

I want to put a listening machine in my test network using a bridge setup. I now have the following test setup: PC1 (192.168.40.250/24) --- Bridge (192.168.40.160/24) --- PC2 (192.168.40.132/24) ...
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0answers
21 views

SAVE default scope global nexthop in CENTOS 7

I have two internet connections from two different ISPs and I need to balance & failover the traffic originating to and from my network between the two ISPs. My settings: FIRST ISP (eno1): 152....
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2answers
82 views

Can a DNS server uniquely identify a specific client device behind a NAT?

I've been playing around with this Netflix Proxy setup (https://github.com/ab77/netflix-proxy), and I noticed that it might be possible to use the DNS endpoint to function like a hotspot with a walled ...
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1answer
47 views

On a host with multiple network interfaces, which interface resp. DNS server is used to resolve the hostname of the local machine (Windows)?

I am trying to answer the following question: What happens if a machine that has multiple network interfaces, gateways, and DNS servers (for example an interface for an Ethernet adapter and one for a ...
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0answers
26 views

VoIP NAT to connect to companies of the same ip address range together

I am currently using packet tracer to configure the network for Company A. I have configured DHCP and telephony service successfully but the problem I'm facing is when company A tries to contact ...
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2answers
395 views

802.3ad bonding configuration file on an Ubuntu 16.04 LTS Server

If I use a manual setup on the command line (following the kernel instructions), I can properly setup my network connection: # modprobe bonding mode=4 miimon=100 # ifconfig bond0 up # ip link set ...
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36 views

Public port forwarding from site A to site B (connected through a site-to-site VPN)

I have two distant offices (site A and site B). The two offices are connected through a site-to-site OpenVPN solution (the VPN servers are independent of the office routers, each router has a static ...
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1answer
22 views

Download Office before or after connecting computer to server?

I work at a small business with very limited access to IT support, so I apologize for having a "Servers for Dummies" question. I am trying to get several new computers as ready as possible to save ...
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0answers
11 views

rfc2307bis LDAP schema: ipNetmaskNumber lookup for an ipHost object

I'm using Openldap for IAM, and consider using it also as a configuration management backend. The rfc2307bis schema has an ipHost class, which allows for ipHostNumber attribute, but not for the ...
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1answer
56 views

OSPF port number

What does that mean "OSPF runs over IP as protocol number 89" as it bypassing transport layer using some socket?
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1answer
76 views

extremly slow lan speed between the working station and the server [closed]

when you are transfer a file to our server it takes realy long time but when you are on the server and transfer a file from a drive to another it just do it immediately i had tried a ping test and ...
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1answer
26 views

Using a Gandi domain and a cloudfront default cert, how can I set up my CNAME records so that https works?

I have a website (www.foo.com), registered with Gandi. I have a static page on Amazon S3 (let's say s3.foo.us-west.com). I also have a Cloudfront distribution (foo.cloudfront.net). Originally, my ...
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1answer
18 views

Does adding more applications to a Citrix session increase network usage?

My understanding of the way Citrix works is that it basically sends screens from the server to the user at the other end. If the server has more applications running can it increase the amount of ...
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44 views

SMB2 disabled, but still functional?

The SMB2 protocol is: Enabled on SERVER1 (i.e, HKLM\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters\SMB2 DWORD is set to 1). Disabled on SERVER2 (the DWORD is set to 0). Enabled on ...
3
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1answer
142 views

Create a multi-homed linux load balancer with two internet connections and one LAN connection

OK,... this has possibly been answered, unfortunately, I have not found anything that looks like it might be the resolution. Ive looked at these pages and they have some useful information, but not ...
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33 views

Configuration SNAT iptables in ubuntu

I have 2 PC be created by VMWARE 1. PC1 (make iptables router): eth0 's IP: 192.168.1.4/24 (network connection is bridged) eth1 's IP: 192.168.2.2/24. (network connection is wmnet9) 2. PC2: ...
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1answer
17 views

How can I have one network card that allows traffic between two private networks?

This is a a question about a private network. I have two servers (Linux), srv1, srv2, each has one NIC. I have two switches (Cisco 3750), sw1, sw2 The servers are on two different subnets. srv1 is ...
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2answers
118 views

No internet access, but DHCP gives out IP?

I'm following EliTheComputerGuy's Windows Server 2012 tutorials to setup my Windows Server and office computers with Active Directory: https://www.youtube.com/watch?v=ZfsXh_LSkgE I want to setup ...
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37 views

“The specified network name is no longer available” after little time inactivity

From a Windows 10 machine I use to connect to a remote machine. While some activity is performed between the two machines, everything is OK, but, if I stop all communications among them for a while (e....
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1answer
40 views

How can I ping devices on Class B network when remote VPN issues Class A network address?

I've been playing with the Sophos UTM Home Edition, and I've noted that SSL VPN connections are issued Class A addresses. Given that the current internal network leases Class B addresses, why can I ...
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2answers
43 views

DNS Look up does not show if domain starts with www

I am a little confused about DNS look up. If I add 'www' to the domain while looking up I see no records. But if I remove 'www' from the domain and then query, I see the DNS records. DNS Propagation ...
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0answers
36 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 ...
1
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1answer
46 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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37 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 ...
0
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1answer
33 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
34 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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3answers
38 views

Expand wlan with a wlan router or access point [closed]

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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1answer
68 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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35 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 ...
1
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1answer
53 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 ...
0
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1answer
40 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
16 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 ...