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

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IPFIX collector with extension support

I need a tool to collect IPFIX records and log the contents of each packet to a log file or database to validate the accuracy of an IPFIX emitter. This IPFIX emitter sends enterprise extensions in the ...
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1answer
45 views

FreeNAS: terrible FTP speeds … what can we do?

We are running FreeNAS 8.2.0 (specs below), and getting extremely slow FTP performance. We have a 100/70mbps FIOS connection, yet FTP (remote) from the FreeNAS is never more than about 5mbps. We ...
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0answers
11 views

Is The MaxUserPort Restriction In Windows Server Accumulative Across All Local IPs?

I have a Windows 2003 server with multiple IPv4 addresses assigned to it. Each single IP address doesn't use more than 2000 outbound sockets/connections. Collectively though across all IPs, this adds ...
2
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1answer
223 views

Is there a standard managed switch configuration protocol?

is there a vendor-independend managed switch configuration protocol e.g. for creating VLANs that can be run over TCP or serial port?
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0answers
19 views

Routing all network traffic through a VPN for VOIP purposes

We have recently moved offices and as we are in a rural area there is no broadband, but there is a strong 4G signal. Problem I have is that our VOIP phones are not allowed to pass through the 4G ...
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3answers
31 views

I have added a port to the public zone in firewalld but still can't access the port

I've been using iptables for a long time, but have never used firewalld until recently. I have enabled port 3000 TCP via firewalld with the following command: # firewall-cmd --zone=public ...
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0answers
22 views

No ethernet link with certain combination of devices and cables [migrated]

I have a problem that seems odd to me. I have a small patch panel in my home which is wired to various outlets. Until recently, I was running my router (an Asus RT-N66U) near the panel but am now ...
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1answer
46 views

Network flow path using spanning tree protocol

I have two machines, A and B, connected via switch S1(master) and s2(slave). I want to measure latency and identify packet flow path from machine A to Switch,switch to machine B. If the link between ...
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1answer
38 views

Serving public IP-adresses through two ethernet ports with public subnets, while protecting some interfaces for remote access

Done a lot of research and it's all kind of confusing. Some switches are also firewalls, most firewalls seems to be routers, with or without their own switches, but they're all different depending on ...
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0answers
29 views

Why are there two different protocols used for Intra- and Inter-AS? [closed]

Why are there two different protocols used for Intra- and Inter-AS? I am learning for my study right now and this is question which can appear but I don't have a idea what the answer could be. Maybe ...
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0answers
14 views

Openstack instance only accessible in host node

Every time I run an instance everything works fine and I can ssh instance only inside the host compute node.when I try it on controller I get this: Warning: Identity file kp0 not accessible: No such ...
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1answer
43 views

Launch an openstack instance with single NIC

I'm totally new to openstack and without much resources I built a cloud with my pc as controller containing a wifi for internet and ethernet for internal connection also with my laptop again with a ...
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1answer
45 views

Limit on IPs assigned to one interface

I have a unique application where I need to use many IPs on one server. Will Ubuntu networking crash if I assign 2048 IPs to one eth0 interface?
1
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1answer
53 views

Windows ignores which interface to use in routing table

Hi i'm running windows 7 and i have 2 network cards, one wireless with internet connection and one wired with local lan connection. I want to use both at the same time so i set the lan card to 1st ...
0
votes
1answer
36 views

Config OpenVPN on Window Server 2008 R2 for client can connect server's Lan network

I installed openvpn 2.1 on my Windows Server 2008 R2. My server has 2 network adapter. The first adapter connect to internet. (default gateway here) The second adapter connect to lan network. ip ...
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1answer
34 views

mikrotik joining two subnets

I have two subnets which are geographically separated, connected by a wireless point to point link (5Mbps). Both networks are connected to internet through their own separate ILL WAN links which are ...
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0answers
27 views

Windows 2008 / 2003 DC can not ping gateway or internet

Im doing some tests trying to setup a domain and i found a very weird behavior. Same thing on windows 2008 r2 and windows 2003 x64 r2. I am running on KVM over proxmox virtualized with virtio. After ...
2
votes
1answer
41 views

Restart just one NIC after IP change?

I just changed the IP address of ixgbe0 like so ipadm delete-if ixgbe0 dladm set-linkprop -p mtu=9000 ixgbe0 ipadm create-if ixgbe0 ipadm create-addr -T static -a 10.10.47.46/16 ixgbe0/v4static and ...
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votes
1answer
27 views

Get dhcp ip from a specific server [closed]

In a network that comes with two dhcp servers, how can I get network configured from one server instead of the other? Let's say there are 2 dhcp servers named A and B. My computer always get network ...
0
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1answer
50 views

Linux Unraid route traffic through different interfaces

I have two interfaces: eth0 and tun5. eth0 is an ethernet to a router and tun5 is a VPN tunnel. These are on an UnRaid server, which is based on Linux. It's a headless server so I access it via SSH. ...
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0answers
17 views

CiscoRV082 DMZ Setup

I work for a small company and we have some mobile units that we need to keep track of in the field. We though that we would set up a simple DMZ to host our new web facing service, just to be as ...
1
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1answer
126 views

Looking for a powershell script that can pull a file from a set of PC's and FTP

I'm looking to write a script (preferably powershell) that will essentially copy a file from a bunch of PC's and FTP it to a server. So the structure of the environment is that we have a file on ...
1
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2answers
55 views

Boot to CD image over network [closed]

I have multiple diagnostics CDs that I want to avoid making twenty copies of for the sake of time and convenience. I figured a good way to do this would be to boot an image of the necessary CD over ...
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0answers
32 views

Measuring latency with switch and identifying flow path

I have two machines, A and B, connected via switch S1(master) and s2(slave). I want to measure latency and identify packet flow path from machine A to Switch,switch to machine B. If the link between ...
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1answer
23 views

Monitor network nodes for availability [duplicate]

I'm installing a network at a factory with around 200-300 PLC's. I have looked into spiceworks and similar solutions, and all of them are more or less computer / printer minded. What I wan't is: A ...
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1answer
28 views

Troubleshooting High TCP Retransmit Rate

I've been attempting to troubleshoot a network issue that presents with very high rate of TCP retransmits. 36 samples (taken with Wireshark 1.10.8 running on 32-bit Windows 7) totaling a little over ...
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1answer
22 views

Connect to soap service via proxy on different ports

I need to connect from a server to a web-service server to consume a SOAP service but due to restrictions in place I cannot connect directly. They did however give me a proxy server that can, but it ...
0
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1answer
21 views

Set up a two-machine-development environment

I took over a SharePoint developing virtual machines images (VMWare) after a colleague quit. It is a two machines developer environment, one with SharePoint Server, the other one with SQL. When I ...
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votes
3answers
66 views

Link aggregation in ESXi 5.5 [closed]

I have a virtual machine on my ESXi server with Ubuntu installed on it. The server has 4 1Gb/s ports that I want to use them all for my virtual machine. An obvious (yet kinda stupid) way would be ...
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1answer
17 views

My lo interface is down on boot. What can I do?

My lo interface is down when the system boot. I can turn it up with ifconfig up lo but I wonder what could be the cause? Where can I look to debug such problem?
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votes
1answer
28 views

Users unable to connect due to an unknown plausible reason [closed]

========================= Warning: Long thread; includes a lot of information to give you some basic understanding of my issues. If you rather not read it, then here are my questions: 1) Does Linux ...
3
votes
1answer
42 views

Recommendations for fiber optic cable and connectors in outdoor 1000 ft. run to get internet connection to main building

I need to connect two buildings where building A has an internet connection and building B has a cat6 network with a bunch of people working inside. The buildings are about 1000 ft. apart. There are ...
1
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1answer
45 views

DHCP Trouble; getting APIPA addresses

I am having trouble with the DHCP Client. I am using a Netgear fvs336gv2 firewall. I recently upgraded to the new firmware and did a factory default reset and reconfigured all the vpn tunnels and LAN. ...
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0answers
52 views

2008 R2 DC / ADDS disaster recovery plan help needed [closed]

First off, I have a perfectly healthy production domain with 2 domain controllers. One is 2008R2, the other is Server 2003. Replication occurs between them, the only issue is there on the same site. ...
-2
votes
1answer
94 views

ethernet switch makes network down [closed]

I have a D-Link 8-port Ethernet switch which was perfectly working. Since 2 days ago it makes the entire network down. The problem is when I disconnect the cables it runs again and after I connect ...
0
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1answer
38 views

Linux: Duplicate network interface to simulate link failures

I run Ubuntu. I need to add some latency and/or some network errors to see if my application can handle with network failure ( connecting & disconnecting ). I found "tc" tool which will be helpful ...
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0answers
18 views

“ifup eth0” causes dhclient to bring up more than one interface

Can someone tell me why dhclient is not respecting to only handle the one interface it has been passed? I've seen this multiple times over the years; never figured it out - it's not related to ...
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0answers
34 views

Detect if Windows is having network errors

I have a server with Windows Server 2008 that is hosting a web site and some background Windows services that appears to be having network issues for the past 48 hours, but I'm not sure how to verify ...
0
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0answers
34 views

CentOS Host KVM Virtual Machine running a Windows VM - No internet access

I've installed a KVM virtual machine on a CentOS host using libvirt. I've also set up a bridged connection from the interface en0:4 running on IP x.x.x.15 to br0. (The IP is a public one). Running ...
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1answer
32 views

incorrent subnet/mask combination

For a network interface, I have defined a range of addresses for DHCP. 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether 08:00:27:5a:3e:be ...
0
votes
1answer
51 views

PXE boot with Virtualbox

I have a linux guest and that is my server. I also have created another guest as the client with no disk. I want to know, which network type and adapter is correct? NAT or Internal Network? AMD or ...
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2answers
31 views

Counting number of connections in a pcap file

What tool can I used to get a count of the number of TCP and UDP connections inside of a pcap file?
14
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2answers
535 views

How can I gain better insight into ISP-managed equipment (routers)?

I have a number of customers who have networking equipment managed by their ISP. This is usually in the form of an ISP-provided switch or router placed at the customer location(s). For sites that ...
1
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1answer
61 views

dnsmasq: failed to create listening socket: Address already in use

The OS is Scientific Linux 6.3 (which is similar to redhat, centos and fedora) and I have installed dnsmasq with the following configuration interface=eth1 domain=hpclab expand-hosts ...
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0answers
88 views

Ubuntu 14.04 KVM Host - Only network device pcnet working

I've installed a KVM host on Ubuntu 14.04. I've added a networking bridge as br0 and also added the p4p1 network adapter to it. My problem is now that only the "pcnet" networking guest driver is ...
0
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0answers
36 views

Ubuntu refuses to route packets for public subnet through linknet

I've run into the novel concept of routing through a linknet from my new ISP, and am currently trying to get a /28 routed properly on my Ubuntu 13.10 server. However, this is proving futile. This is ...
1
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1answer
43 views

NTP Server in Network Switch

Is it possible to set up a Switch to acts an NTP Server for the devices connected to its VLAN ? If so ,how can I implement it my HP Switch A3600 JG299A. I want to do this because I do not have ...
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0answers
17 views

Issue with Network IP Binding

Trying to bind a /29 (my possession, not the ISP or data center). It's routed at my core switch fine. interface Vlan70 description SERVER070 ip address xxx.xxx.42.45 255.255.255.248 Content of: ...
2
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1answer
89 views

Production servers can suddenly not access the internet anymore

Problem All Production Servers were suddenly not able to access the internet anymore, while four other Servers connected to the same VLAN and same eth0 settings can. Figure 1: System 1 represents ...
0
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1answer
49 views

Best practices for laptop on multiple networks

Scenario: W7 laptop that in the office is joined to a domain with a static I.P. address, but everywhere else needs DHCP. What is the best approach for (hopefully during start up) to determine which ...