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

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2answers
96 views

IP on different subnet mask [closed]

I'm still learning the ropes of Windows Server (specifically 2012R2). My assigned task is to setup a static local IP address, I managed to get it set to 192.168.1.96 (with subnet mask 255.255.255.0) ...
1
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1answer
27 views

KVM fastest network between 2 guests

I wonder if there is any way to speed up the network communication between 2 KVM guests on the same physical machine. Would that help at all if I would configure a separate bridge network for just ...
-1
votes
1answer
43 views

Hostname is not mapped to the ip address correctly [closed]

I recently installed Wordpress on my home server running Arch Linux. Everything else works smoothly except that when try to access the server externally, the style sheet is not rendered. I have read ...
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votes
0answers
16 views

Can't access host-only network when on two interfaces [migrated]

I'm trying to use a host-only connection with my VirtualBox VM. My VM is set up and can ping the host (192.168.56.1) on vboxnet0. If I disconnect the host from my local network (internet access) I ...
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votes
1answer
38 views

How to extend the VLAN defined in the Ethernet network into the WiFi network? [closed]

How to extend the VLAN that you have defined in the Ethernet network into the WiFi network?
1
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3answers
2k views

Cannot ping from a bridged inteface

I am trying to bridge between eth2 and br0 from Ubuntu 11.04 within virtual box. There is network bridging to host physical machine. From the guest OS after bridging I can ping from br0 but ...
0
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0answers
12 views

ip command vs qdisc discrepancy in dropped packets

I am simulating packet loss via mininet network on Ubuntu 14.04. Why are there no dropped packets showing up in ip command? For switch s3, I have Qdisc (sudo tc -s qdisc show): qdisc htb 5: dev ...
0
votes
1answer
31 views

RTNETLINK answers: Invalid argument while specifying packet loss by tc command

I am trying to specify packet loss by tc command on interface (port) 1 of switch part of network I have created using mininet : sudo tc qdisc change dev s1-eth1 root netem loss 0.1% but gettring ...
4
votes
2answers
258 views

Interconnecting options for server rack and network rack?

This is my first post on Stack Exchange after years of roaming around. I'm having difficulty deciding on a rack setup that meets our company's needs for scalability, management, and future proofing. ...
0
votes
0answers
59 views

Proxying request from nginx docker container to tomcat docker container (all inside Vagrant VM)

Running a Vagrant (virtualbox) VM with two docker containers inside, nginx and tomcat. Want to host static files in nginx container and proxy web requests to the tomcat container. I've read up on ...
2
votes
1answer
3k views

How do I view cached PMTU under Linux (and all other OSs)

When I ping a remote site with the DF bit set and a packet size that is too big for my router the first ICMP "fragmentation required" message is sent from the router. After that the message comes from ...
0
votes
0answers
31 views

changing IP for specific host DNS entry in BIND for dedicated server [duplicate]

changing IP for specific host DNS example (test.com) entry in BIND to point to different IP let say my 2nd dedicated server IP. I have dedicated server hosting on data centre running BIND9, connected ...
0
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0answers
42 views

Solaris 5.10 telnet connection closed by foreign host

I try to connect to a Solaris 5.10 server using telnet, but I only see: $ telnet xxx.xxx.xxx.xxx Trying xxx.xxx.xxx.xxx... Connected to xxx.xxx.xxx.xxx. Escape character is '^]'. Connection closed by ...
-4
votes
1answer
86 views

Migrating from a Class A network to a Class C network [closed]

In broad terms, how can one safely to transition from a Class A (10.x.x.x) to Class C network? We have a gateway for the internet, and a separate local DNS and DHCP server, in this setup.
1
vote
1answer
107 views

Receive many UDP packets & ksoftirqd load

I want my server to be able to handle more than 1Mpps from a 10g card. Is it possible? I have Ubuntu 14.04 with kernel 3.11 and a 16 core Xeon machine. It seems that ksoftirqd becomes bottleneck in ...
0
votes
2answers
21 views

How do I monitor network usage on a Windows server?

I would like to monitor server bandwidth usage. The server OS is Windows Server 2012 This should give me as result the amount of data over a certain period of time and separate it by protocol and by ...
0
votes
1answer
18 views

Connection from application on network share fails

EDIT: I tested some more...If I copy nslookup from the Windows directory to my mapped network drive, it cant' resolve hostnames: H:\nslookup dbserver (null) UnKnown Address: 192.168.0.195 If I ...
0
votes
1answer
69 views

Ping response time suddenly rose up to average 1500ms or more

At normal situation the ping (8.8.8.8) response time is 50ms. But out of sudden it just peaked to 1500ms average or more and quite frequent recently. My server is CentOS 6.6 with eth0 (192.168.1.1) ...
1
vote
1answer
23k views

Setting a static route for a specific network adapter with two network adapters

I have a virtual windows server 2008 r2 with 2 virtual network adapters, one is part of a domain and the other isn't. When I ping to a specific PC that is part of the domain it connects to it through ...
-1
votes
2answers
161 views

Trouble understanding how to setup network Bridge on Ubuntu 14.04.2 to act as a web content filter

I am trying to build an Ubuntu server to act as a web content filter, using Squidguard and Dansguardian. There are great resources such as this: ...
0
votes
1answer
34 views

Import a vm image to a new host machine with virt-manager

I need to recover a guest machine with Windows 2003 on a new host server on Centos 7 with virt-manager. I've shut down a guest machine and simply copied its .img file from /var/lib/libvirt/images. ...
0
votes
0answers
12 views

response ping is expired in transit [duplicate]

I've configured my debian's network on virtual box: auto lo iface lo inet loopback auto eth0 allow-hotplug eth0 iface eth0 inet static address 192.168.56.15 netmask 255.255.255.0 gateway ...
1
vote
2answers
55 views

setting up linux router

I have setup three Ubuntu VMs in vmware. These are connected as: Now I want to use UBUNTU2 as router, so that when I run these commands in UBUNTU1, I get response from UBUNTU3, commands: ping ...
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votes
1answer
59 views

Two network adapters for a machine to double the transfer speed [closed]

i am new to this. In my scenario, i have a desktop pc running windows 7 and planning to set up a local web server using xampp for big file transfer in the lab. The problem is that,there are 80 ...
1
vote
1answer
92 views

Which kernel parameters should be adjusted to fix RX overruns?

I have a Centos 6 server that handles a lot of traffic. I see RX overruns increasing all the time: RX packets:11191345002 errors:0 dropped:0 overruns:35592596 frame:0 TX packets:15262461573 errors:0 ...
10
votes
14answers
40k views

How to securely join two networks together over the Internet?

Let's say there are two locations. Both locations have their own fast Internet connections. How do you join these two networks together such that every computer can see every other computer? Do you ...
2
votes
2answers
4k views

Windows Server 2012 R2 runs out of ephemeral ports, though it shouldn't

We are regularly experiencing strange issues with networking on our dedicated server. It runs Windows Server 2012 R2 x64 on Xeon E5620 with 16 GB RAM and Intel 82575EB network adapter. Please note ...
0
votes
1answer
38 views

Intermittent server LAN drop

I've been trying to hunt down a network issue we've been having for a while. We have two Dell T310 servers running Windows Server 2008 R2 on them. Quite a few users have complained that they get ...
0
votes
1answer
61 views

How to mount network drive as local disk?

I have some resource, which I can open by address \\dir\bin. I want to mount this resource on disk Z. In other words, I want to have path like Z:\file1.txt and get file \\dir\bin\file1.txt. I tried ...
0
votes
0answers
27 views

Creation of a guest Wireless network 802.1X - easy to configure out of the box on clients (android, ios, computers,..)

I would like to create a Guest wireless network with 802.1X (WPA enteprise). On the client side, it must be easy to configure, so the users can enter a login and password during the authentication ...
0
votes
1answer
67 views

HA-Proxy 301 re-direct: https to https://www

I am trying to have HA-Proxy 301 redirect an https domain. I need: https://example.com to redirect to https://www.example.com This is what I was trying to get it to work: # corp - example.com ...
0
votes
2answers
29 views

Windows Server 2012 two out going connections

I have a server with several Ethernet ports. I have the first 3 bridged together for the local network. The 4th is plugged into the modem which is giving it a public IPv4 address. How do I tell the ...
0
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0answers
7 views

Not able to authenticate via internal DNS

When I installed Sharepoint on my server, I gave the internal DNS to access the Sharepoint internally (by DNS Manager), but when I am trying access the Sharepoint by DNS sharepoint.abc.com then it is ...
0
votes
0answers
12 views

Cisco 1941 HWIC Prohibitions

I recently upgraded our Cisco 1941/K9 router (see figure 4 here) to include an additional HWIC (HWIC-2FE) without issue. During my research for an applicable module to provision the necessary ports I ...
0
votes
1answer
36 views

What does a switch do with invalid VLAN tagged traffic?

Say you're plugged into a switch that allows TAGGED 2; and treats UNTAGGED 5. However, say you tag your traffic 10... which isn't "valid" on that port. What happens to any traffic you send?
0
votes
2answers
162 views

PCI scan failed for “scan interference” on Sonicwall NSA E5500 firewall

We've started having Trustwave do monthly PCI network vulnerability scans. The last couple months we've passed, but this month it failed for "Scan Interference Detected." This is their recommendation: ...
0
votes
0answers
16 views

No package transfer from host to guest on KVM

I want to assign external static IPs to my KVM guests. I do not prefer a NAT solution. What should be the configuration of network and routing tables? I manually assing a static IP to guest. I can ...
0
votes
0answers
59 views

Cisco 3120 blade switch does not boot after power outage

We use a Cisco WS-CBS3120G-S in a HP BladeCenter. After a power outage, the switch will not boot anymore. The switch dose not output anything on serial console. The LEDs SYST, STCK and active (under ...
0
votes
1answer
85 views

Is there any harm to use the broadcast IP for a host?

I'm managing a /27 network. Obviously I cannot assign the network address to any host, but I found assigning the broadcast IP to a host seems to be OK. The host with the broadcast IP of the network as ...
1
vote
1answer
64 views

Debian Linux default interface?

I have a Debian machine with an SNMP pooler running, but I am running into an issue with getting the pooler to use a specific interface. The Debian machine has 3 interfaces allow-hotplug eth0 iface ...
0
votes
1answer
32 views

Network route quality - test if server has good routes to users

I noticed between two servers I get about 500Mbps of throughput and between two others I get about 25Mbps. While it may not be related to my issue (which I'm not interested in solving for the ...
0
votes
1answer
32 views

Sending file with netcat over UDP: Unusual Wireshark output

For the purposes of demonstrating differences between TCP and UDP, I'm piping the contents of a file across a network connection, and recording the interaction with Wireshark. Everything looks normal ...
0
votes
1answer
22 views

Bind9 DNS Setup

I have my network set up like this: My question: what is the best approach for setting DNS on this network so that all host (H1, H2 and H3) can resolve each other? It is enough to just have NS1 as ...
0
votes
1answer
32 views

NetBios issues with multiple adapters, may not be turning on

I'm working in a Windows 2008 server. I'm getting conflicting messages as to weather or not netbios is enabled. The problem is that my AD users can't "discover" the server. I think that netbios is to ...
0
votes
0answers
12 views

Create a top Bond (ALB) on 2 lower Bond (LACP)

Is it possible to create a BOND over a BOND? or this will cause some networking issue? Why do I need this setup? I have 2 switch that support LACP but not distributed LACP! My Server has 4 ethernet ...
9
votes
3answers
824 views

How does Intel AMT (Active Management Technology) not interfere with the TCP/IP host stack?

The Intel dev kit I've been using includes a remote management feature (also see the Ubuntu man page here) which allows remote reboots in case the operating system hangs. It has the capability of ...
0
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1answer
75 views

Mapped Network Drive Dropping

We have a Head Office with a file server containing shared folders. Group Policy is used to map all of the network drives on every domain joined PC. One of our remote sites, connects back to Head ...
0
votes
0answers
29 views

SonicWall Global VPN only works with old static IP

I have a Sonicwall NSA 2400 MX that has been working just fine with GlobalVPN client. We received a new fiber connection with a new block of IP's. I have set one of the LAN ports to the WAN portshield ...
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votes
1answer
42 views

Servers in different DC's - performance impact

Today Linode eat my nerves completely by shutting down main DB server for 25 minutes due to their internal network problems. Right today I was going to set up another one server at linode to set up ...
1
vote
2answers
578 views

Sonicwall NSA 2400 Not switching back to Primary VPN after Failover

We are experiencing an issue with our SonicWall NSA 2400 Firewall. We have a secondary gateway over IPSec setup in the event of a failure of our main ISP (which is unfortunately common). The ...