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

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5 views

OpenVZ can't reach the internet

I have a vps running and it seems to be ok, but I am unable to access to internet. I am only able to access the internal network. Note: I only have 1 ip address and I have never done anything like ...
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1answer
15 views

Is there a way to control Internet usage on LAN?

I have a network with many client PCs. I have to block Internet access for some of the users and allow it for others. Is there a way that can control Internet access, or filter and allow based on MAC ...
1
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9answers
40k views

Windows 2008 Server cannot access any network share

I run a Windows 2008 server with SP2. This server acts as a desktop alone. Recently, I switched between two networks (corporate and other) using this system. Ever since, I am unable to access any ...
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2answers
878 views

How to share Internet connection with Ubuntu Virtual Machine?

I have Windows Server 2008 R2 as host and Installed Ubuntu 11.04 as Virtual Machine using Virtual Box. My proxy is configured using URL. I tried configuring in the networking settings and also with ...
0
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1answer
29 views

PXE boot to ISO file

I have an ISO file for an HP diagnostics boot. Rather than burning a CD for every single computer I want to run diagnostics on, I'm wondering if I could load this file onto a server and allow the ...
1
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1answer
1k views

Redirect some specific traffic to a different gateway

I have two gateways with different ISP, one of them defined as default for the LAN user and the other ISP used as the default for the Servers and VPN traffic. This is done using regular routing tables ...
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0answers
15 views

create map of network connection and firewall rules then [on hold]

There is a complex live system - few vlans, in each of them are linux servers, and on every server are services. Services connect together - for example service http on host A connect to service mysql ...
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0answers
626 views

How to execute a script only once, immediately after ALL network interfaces are up in OpenSUSE?

I run Opensuse 12.2. I have 3 network interfaces, eth[012] The interfaces are configured in /etc/sysconfig/network/ifcfg-eth[012] I want to execute a script immediately after ALL three interfaces ...
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0answers
3 views

CoreOS on VirtualBox only works with one adapter at a time [migrated]

I'm trying to learn more about CoreOS. (I'm not using Vagrant, just plain-old VirtualBox.) So I created a disk using coreos-install. Unfortunately, I can't find my original cloud-config.yaml file, but ...
6
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1answer
5k views

snmptt not translating traps, even with translate_log_trap_oid=1

I am having some trouble configuring snmptt to properly translate snmp traps. The following is a problem: /etc/snmp/snmptt.conf reflects: EVENT fgFmTrapIfChange .1.3.6.1.4.1.12356.101.6.0.1004 ...
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0answers
13 views

Draytek Vigor 2860 multiple external IP-addresses

I've bought a DrayTek Vigor 2860 for my company network. And I'd like to use it for two VLANs with separated external IP's. I have 6 LAN ports on my DrayTek. For example: External IP-adres: ...
2
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1answer
7k views

Is the airport extreme's 50 user limit the same in multiple access point configurations?

Im currently evaluating options for extending our Church's wireless connectivity. We're also installing a Win 2k8 Domain Controller, DHCP and DNS server. We need wireless access points that work ...
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0answers
17 views

Not working persistent routes on virtual debian machines

I am very new at this. Sorry , english is not my native language. I am not a network administrator or anything like that. My teacher assigned us a homework. The delivery date has already passed, but, ...
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0answers
10 views

IIS 8.5 links are showing local domain not ip

I have set up IIS 8.5 on windows 8.1 as a development site but I need to let people in different office look at it. When they load it by going to my public ip address the initial html loads fine but ...
7
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2answers
5k views

What does limit performance of scp?

I've two Debian Linux machine connected via 1 Gbit LAN. I can measure this with a raw HTTP file transfer with wget which gets around 100MB/s in either direction. When I now use scp, the maximum ...
1
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3answers
861 views

monitoring switches with Nagios

I'm trying to monitoring switch with Nagios. I had made everything like in this tutorial, but I'm getting Status Information in Nagios browser window like this: (Return code of 127 is out of bounds - ...
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0answers
31 views

Proper network configuration on WAN interfaces [on hold]

I am curious about how this configuration works. The final result (by me): When I ping from PC0 to PC1 I get a response. I left the RIP empty for each router and I could still ping PC1 from PC0. ...
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0answers
16 views

Cannot connect to the Internet, Limited Access(Ethernet), Windows Server 2012

I am using a Windows Server 2012 for my institute, due to connectivity issues I uninstalled the services AD DS, DHCP, DNS. But after the uninstall the server is unable to connect to the Internet, ...
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1answer
1k views

IP setting in CentoOS 6.2x64 by XenCenter 6.2

I have setup a Guest CentOS virtual machine in Xenserver.. I have updated the Xentools but i cannot find the option to config my IP Address which is showing to be 'unknown' currently. All i need to do ...
0
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1answer
18 views

Dell Kace1000 reset password issues

Following these instructions, and using the credentials netdiag/netdiag it returns the error: "Login Incorrect". At the login prompt, type netdiag. The password is netdiag. Note: On older ...
1
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2answers
1k views

Smoothwall Express interface issues

I have a SmoothWall Express box that is currently configured with a Green and Purple interface. Both interfaces are in the same /24 subnet (which seems odd to me). The green interface (address of ...
6
votes
1answer
825 views

Debian, 6rd tunnel, and connection troubles

Long story short, I am having issues with IPv6 using a 6rd tunnel with my ISP, Charter Business. They offer a 6rd tunnel that I think I have properly set up, but the server doesn’t reply to every IPv6 ...
2
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1answer
2k views

How to force certain traffic through GRE tunnel?

Here's what I do. Server (public internet is 222.x.x.x): echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf sysctl -p iptunnel add gre1 mode gre local 222.x.x.x remote 115.x.x.x ttl 255 ...
7
votes
1answer
884 views

Are network switch data transfer speed limits per port or per device?

When network switches report speeds of say 100 Mbit or 1 Gbit, are they referring to the maximum speed per Ethernet port or is this the physical limit of the switch on all ports? Say for example two ...
8
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5answers
12k views

Network Error: no buffer space available

After some time of running fine, one of our Windows XP SP3 machines does not open some(!) new TCP/IP connections anymore. Putty says Network Error: no buffer space available, IE won't open any new ...
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0answers
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Network Vicinity View doesn't show agent managed PCs

Network Vicinity View in my SCOM only shows other network devices+management server, but does not show any agent managed computers, why is that? Or is it supposed to be like that and i'm missing ...
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2answers
12k views

Fortigate 200A firewall CPU high resource usage

This morning I'm receiving complaints from several end users that saying their whole department network are slow and have intermittent. Therefore I've checked our firewall to see whether if something ...
1
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0answers
46 views

Can iSCSI and Internet work on same NIC? [on hold]

I have a Synology RS815+ that supports iSCSI with 4 GbE ports. I have two Mac Mini's (2014) with built-in GbE and a TB to GbE adapter. All 8 connections are tied to the same switch, with client ...
1
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1answer
37 views

Windows DHCP MAC-Range to Scope allocation

I wonder if there is any options to map a specific Range of MAC addresses to a specific DHCP address scope. The thing is, I want a specific scope for address allocation to bridged Virtual Machines ...
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2answers
19 views

Does Windows Network Load Balancing require any specific ports to be open?

I have two Windows 2012 servers, joined in a Windows Network Load Balancing cluster. I have been trying to find how the NLB heartbeat message is exchanged between those servers (to make sure it will ...
1
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1answer
18 views

Does TCP's MSS hide a mismatched intra-LAN MTU?

I'm trying to understand how mismatched MTUs behave in a network. Suppose two hosts are able to talk to each other through an Ethernet-based network. The network and host A are configured for jumbo ...
0
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1answer
33 views

PXE or other : deploy images on single board computers (SBC)

We have a few SBCs of various modeles (but a lot of freescale). When received, these SBCs are bare (no BIOS/U-boot). We generate linux embedded images with Yocto (using U-boot as bootloader), and we ...
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1answer
50 views

Connect two infiniband cards to each other without a switch

Is it possible to connect two Mellanox ConnectX-2 cards on two seperate computers to each other without a switch in between? I am just trying to learn to use verbs programming without having to spend ...
1
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1answer
35 views

Infiniband cable

What is the difference between an active and a passive cable? What is the difference between QSFP and QSFP+? Given the choice between copper and fiber, for a very short distance like 3 feet max, is ...
1
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0answers
21 views

What is the best way to configure an iDRAC/dell server in a public data center such that the idrac doesn't have to be exposed public facing

I have a server right now in a data center behind an OpenVPN using the client on the box to connect to the vpn server. I'm going to install the iDRAC and want to know how to best configure the ...
0
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0answers
31 views

Unknown device showing up in network scan

I need some help finding a device that has been showing up whenever I scan my network using Spiceworks' "Inventory" scan. I can ping the device, but nslookup returns a non-existent domain, and ...
0
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0answers
18 views

Slow download speeds from Debian server [on hold]

My server is connected to a network which allows for up to 75Mb/s down and up speeds. I have tested this on other computers on the same network with speedtest.net, and the speed is in fact 75/75. When ...
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votes
2answers
34 views

Finding the server that blocks port [on hold]

Is it possible to find which server is blocking one specific port using unix tools (on a complex local network)? I know the server to which I want to connect and also the port. But something seems ...
2
votes
1answer
29 views

why do all softphones fail to authenticate after receiving 401 unauthorized from Asterisk?

When I attempt to connect to the Asterisk server from CSipSimple, over a Cisco router, on the same network, Asterisk logs show the attempted connection: <-------------> [Mar 23 20:01:34] ...
1
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3answers
922 views

How to make same server IP accessible from multiple interfaces that are not bridged on Windows 2008 R2?

My server have two interfaces (e.g. A, B) that are not bridged. These interfaces have different IP adresses (e.g. 192.168.1.1, 10.0.0.1). These IP addresses are in different subnets. I need to ...
0
votes
1answer
26 views

NFS Server “outbound” bandwidth consumption

I need to understand about something in NFS (Server). Let say i have: Two Different Clouds (One Server on each) One NFS Server One Apache Server (as the NFS Client) with a NFS Mounted Directory ...
1
vote
1answer
17 views

Proxmox: 1 NIC, 1 Public IP, unable to get WAN interface working in VMs

I have a computer running Proxmox, and it has 1 single NIC that is directly connected to internet and has a single public IP. Then, I have different VMs (KVM) running and one of them is pfSense. What ...
1
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1answer
2k views

Assign ipv6 address to KVM guests on bridge mode

System: CentOS 6.5 Network: Bridge on br0 IPv6: ISP Native /64 block. IPv4: ISP address (not internal LAN) Purpose: To assign IPv6 only to guests (manually), I don't want ipv4 address to be ...
0
votes
3answers
162 views

Default route and backup default route

I am dealing with the following topology: I have an "ISP ROUTER" connected via fastethernet to a MAIN router. "ISP ROUTER" is also connected via serial link to router CITY. CITY and MAIN are ...
0
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2answers
853 views

Gateway gets stripped from DHCP Reply through OpenVPN tunnel

I have a bridged OpenVPN setup. This is my server config: port 1194 proto udp dev tap0 ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/server.crt key ...
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1answer
25 views

configure two routers to one T1

We have a router hooked up to our T1, and the router went down the other day and caused our phones to go down so i had an idea to use a backup router. I know very little about networking. Is it ...
0
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1answer
45 views

How can I configure multiple tap interfaces for a single KVM virtual machine

I am trying to setup a VM using Linux KVM for a F5 BIG-IP VE deployment (used in a lab) ...
0
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4answers
8k views

Download speed of 2Mbps broadband [on hold]

What is the maximum download speed in a 2Mbps broadband. Is there any relationship between the bandwidth and downloading speed?
0
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1answer
6 views

reg query inside unknown keystring

Is there a way to reg query into an unknown keystring? What I mean by this is if I do reg query HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\ the entries will ...
0
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0answers
26 views

Active directory creates network issues

I have an OpenStack virtualization environment, where I created 3 VMs using the same Windows Server 2012R2 image. Each machine is syspreped after initial deployment. My goal was setting up a simple AD ...