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
34 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 ...
0
votes
1answer
17 views

Issues configuring IPv6 on Red Hat 5.8

I'm new at linux and i'm trying to configure IPv6 on a Red Hat 5.8 due a specific application I'm working on. This Linux is installed in a VMWare 8 and the IPv4 is working fine! I can ping the host ...
0
votes
0answers
9 views

Avahi How do I setup multiple servers that originally have the same hostname

Let me explain what I'm trying to do: I'm creating a Linux Distro Image that will be installed on a SD Card Setting the default hostname to myHostname.local This is all on my local network This is ...
0
votes
0answers
9 views

Making proxies on Debian

Hi guys I am trying to create SOCKS Proxies on my VPS and currently am not getting too far so any help is well appreciated. Here's a few details on my VPS: It is running Debian linux, has 512mb ram ...
0
votes
1answer
7 views

Azure outbound communication

I'm having outbound communication issues on Ubuntu machines on the Azure service. I've setup the server using Ubuntu 14.04 (also tried 12.04) and I have no trouble SSHing into the machine or browsing ...
-1
votes
2answers
37 views

How to check if my network blocks a port on Windows? [on hold]

I'm trying to connect to a remote SSH server from my Windows machine, however the client (PuTTY) keeps raising an error telling that the remote server refuses the connection. I have already checked ...
0
votes
2answers
32 views

DHCP server does not work with 2 router

i have problem on packet tracer when i try to setup DHCP server with 2 different network and 2 router.. my setup is Two 2811 router, Two 2960 switch , One DHCP server and 4 PCs. in Router 1 I have ...
1
vote
1answer
35 views

Hyper-v Virtual Network Switch Configuration

I have Hyper-v Running. What I am trying to do is setup a CentOS firewall box which will forward all traffic to the 2nd VM CentOS box which has an internal adapter and only seen by the 1st VM ...
4
votes
3answers
162 views

Can a user see the Active Directory computer description in the Windows network browser?

This may qualify as another Stupid Question from someone fairly inexperienced in Active Directory, but I've noticed a handy "Description" field for computers in the Active Directory Users and ...
0
votes
0answers
19 views

Switchport VLAN config

I dealing with an Allied-telesis switch which just doesn't want to do what I need even if I configure it directly through the console. I have machine A plugged into port 1, B plugged into port 2. ...
0
votes
0answers
4 views

Disabling ssid broadcast programatically/CLI and keeping exsisting devices connected DD-wrt access point

I'm trying to disable/hide my SSID broadcast programatically in order to stop devices connecting to my access point (not for security reasons). I have tried renaming the SSID and setting it to nothing ...
0
votes
0answers
17 views

HTTP not redirecting to HTTPS, Router or Firewall Issue?

I manage an application server in a different department from IT and since they implemented a new firewall as part of emergency maintenance, users are having issues accessing the web app(Blackboard). ...
0
votes
1answer
16 views

Security groups or ACLs?

I'm currently setting up several subnets on Amazon VPC. For example I've got a subnet for the database servers, one for the webservers and one for the load balancers. I try to restrict the access to ...
1
vote
1answer
17 views

Resetting to factory default on a Gigamon GigaVUE-212

I purchased the above-mentioned GigaVUE-212 for my test lab from eBay, to determine if I want to use them in production. However, the thing doesn't respond to the default passwords, and I can't ...
0
votes
0answers
5 views

ISA timeout: no access to web server

we have a dlink switch connected to an ISP modem in the wan interface, to servers and to another switch (connected do hosts). The problem is that when i try to connect to a server connected to thz ...
-2
votes
1answer
9 views

Cisco 877w - Brindging Dot11Radio & ATM to access the internet [on hold]

I have a cisco 877w router, connected to ADSL internet line, what I'm looking for is to create wifi access point with the DOT11Radio interface so that client can access the internet from their phones ...
0
votes
0answers
30 views

Connect two servers with RJ-45 cable and iptables (without switch!)

I have two servers and server_1 is connected to INTERNET port (of server farm) at eth0. No switch. They connected with cable from (server_1)eth1 -> (server_2)eth0 : ifconfig of (server_1): eth0 ...
1
vote
1answer
22 views

ICMP Request not reaching the guest machine on virtualbox

I have a virtual box (4.3.14) installed on host ubuntu 12.04. I have a guest machine ubuntu 12.04 32 bit installed on this virtual box. The problem is that, my ping request is not reaching the guest ...
0
votes
1answer
16 views

Why am I seeing prefixed/duplicated packets coming from a comcast device?

I'm looking at traffic my CPE from Comcast in Wireshark, and for every packet, there is an additional packet that is the exact same, except for 4 additional bytes at the beginning of the frame ...
0
votes
1answer
20 views

TLS Error on OpenVPN

Client: OpenVPN 2.3.4 64bit (Works fine connecting to my pfSense at home) Server: OpenVPN 2.2.2 installed via yum Followed this guide: ...
-1
votes
1answer
34 views

Unable to connect to localhost or local ip but can connect to other servers or websites

I have a server with nginx|bind|mysql installed, everything is working fine but I am unable to connect to localhost or any websites hosted on server. I tried pinging and wget and none of them work ...
0
votes
1answer
36 views

How to set DNS exclusively for a Network Namespace in Linux

I've created a network namespace in Linux. I thought there was a resolv.conf file for each namespaces created but it's not the case on my system. I don't have the following path ...
2
votes
1answer
46 views

Non-invasive way for our network team to run ping/tracert/etc from various servers

In troubleshooting connectivity issues, our network team lacks the rights on our servers (Windows and RHEL) to connect and test connectivity (for example, when tweaking a firewall rule, a ticket ...
0
votes
1answer
21 views

OpenVPN routing

My VPN network is 10.10.10.0 Apart from the server I have two special machines. I need all the clients to see 10.10.10.10 and I also need 10.10.10.30 to see all the clients. Enabling ...
-1
votes
0answers
36 views

Get Vagrant running on its own ip address 127.0.0.2? [on hold]

I might be approaching this wrong but... I have a vagrant box running with varnish as a reverse proxy. It routes traffic to 3 servers, software running on different ports on the same box by domain ...
1
vote
1answer
33 views

Trying to setup Multi-Homing under Ubuntu12 but can only get 1 of 2 IP to accept requests

I am having an issue on some new servers that we are creating under Ubuntu 12 in a virtual box running under VMware(VSphere I believe). This is at an ISP not my desktop. I think that we have the same ...
1
vote
1answer
41 views

DNS and IP Configuration for Windows Server 2012 DC

I am getting these errors: SERVER Error DNS: DNS servers on vEthernet (Intel(R) 82567V-2 Gigabit Network Connection - Virtual Switch) should include the loopback address, but not as the first ...
4
votes
4answers
217 views

How do I Control the Ordering of Network Interfaces?

I'm attempting to configure a machine with 3 NICs, the first two are built-in GbE controllers, the third is a 10GbE controller. Via NetworkManager, I've configured the 'first' GbE NIC (which at the ...
-5
votes
0answers
30 views

Broadcast limiting in the switch [closed]

How a broadcast limiting in switch works. will it limit bcast only or multicast also? Any idea?
-3
votes
2answers
46 views

What is the most reliable internet connection at workplace [closed]

We need to upgrade out internet connectivity speed (infrastructure) at my workplace. Unfortunately, the office is located in a remote location and it is hard to convince the service providers to ...
-1
votes
1answer
46 views

Network load balancing: LACP between Debian & FreeNAS over Cisco Switch doesn't work

My setup: 2 Debian Server, with Bonding 2 Storage Server FreeNAS with Link Aggregation 1 Cisco Switch SG-200 with LAG enabled MTU 9000 enabled everywhere Result: Network performance is still single ...
1
vote
0answers
8 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 ...
0
votes
1answer
38 views

Relate multiple physical network ports to ESXi's virtual network adapter

I have a ESXi 5.0 machine with 1 built-in (in motherboard) network port, plus 2 ethernet PCI cards - each has 4 ports. To sum up - I have a total of 9 physical network ports in the machine. How do I ...
1
vote
0answers
73 views

Haproxy using 10GB Memory and 100% CPU with 50k connections

On a Ubuntu 14.04 x64 server, Haproxy uses 3.3 GB of memory and 6.8 GB of swap, while handling 52k connections. The CPU usage also keeps spiking to 100% before most of the traffic was redirected to ...
0
votes
1answer
44 views

Configuring a linux machine for high inbound network load

I'm running Ubuntu 12.04 on an a dual processor Intel E5-2620-HexCore, 64GB of RAM, 1Gb network link. When downloading a single test file from a location in the same datacenter (Public network) I get ...
2
votes
3answers
74 views

Should I use rsync compression over a gigabit LAN?

I normally use rsync's -z option to enable compression when transferring files over the internet. However, if I am on my own (idle) gigabit LAN, do I still want compression? Or will it be faster ...
1
vote
0answers
22 views

ping: sendmsg: Operation not permitted (sometimes)

On a Ubuntu 14.04 running Haproxy, after a service haproxy reload, Haproxy is suddenly reporting all servers behind it as down. After some digging around, I noticed that ping is not working properly, ...
-5
votes
0answers
29 views

How to use net, netsh, netstat etc. to troubleshoot/monitor network [closed]

On Windows what are these commands: net, netsh, netstat etc? Can someone please brief how can these tools be used to monitor/troubleshoot server and network connections?
0
votes
5answers
44 views

Disconnecting connections to TCP server by external means [closed]

I have a TCP server listening on some port on my box (Windows XP). There are many users connected to it. Now without bringing down server application or box, or without unplugging network cables how ...
0
votes
0answers
40 views

Web usage monitoring [migrated]

We are group of friends working in shared wifi network. Can anyone of us monitor what other guys are surfing from their computer? Is there any tools or Admin right for such monitoring?
1
vote
1answer
15 views

Why some tcp_[rw]?mem$ voodoo show all equal values?

Looking at TCP optimization guides across the Internet, a common theme is setting the tcp_mem, tcp_rmem, or tcp_wmem three-integer vector to have equal values in the sysctl.conf file. Borrowing from ...
0
votes
0answers
9 views

How do I determine what bandwidth/speed I will need for a website (I know page size, # users) [duplicate]

I am trying to determine the connection speed I would need for my website and monthly bandwidth needed. How do I do this? I know: # of users per month (I'm fine with using this number as a "fact") ...
2
votes
1answer
92 views

Weird network problems with Vagrant, VirtualBox, Ansible and Ubuntu Server box

We are using Vagrant and Ansible to provision VirtualBox machine. It was working great, but recently we've started to encounter some weird network problems with tasks that require access to the ...
1
vote
1answer
29 views

Active CARP network loop

I have to setup, no matter what, a cluster of 3 active OpenBSD 5.5 with CARP on 3 separate ESXi 5.5 hosts. I think I'm close to the end but I have this message in /var/log/messages : carp0: replay ...
0
votes
1answer
16 views

Routing of pptp clients

I have just configured a PPTP VPN server in an AWS VPC subnet. However, I am unable to ping through to other hosts in the same subnet (as the VPN server). I am not sure whether I am overlooking a ...
0
votes
0answers
30 views

Machine shows up in router but no responding to ping and any other connections [migrated]

Well, the machine is not technically a server, just a normal pc box running linux. I left that machine on in my apartment when I went home for the summer. However, about one month later, I realized ...
3
votes
2answers
67 views

same subnet,different VLAN in Virtual machine

I have 2 VLAN,VLAN 100 and 101 but only one subnet i am trying to make this work with virtual machine so that VM will have two IP address in same subnet but will actually be in two VLAN. steps ...
0
votes
0answers
9 views

ASUS RT-N66U how to identify source of traffic spike [migrated]

I have an ASUS RT-N66U as my home router. We are experiencing some traffic spikes in downloading over WiFi that slow all other activity to a crawl. Is there a way to identify the source (ip/host) of ...
-2
votes
1answer
50 views

Hardware solution for small IT company [closed]

I'm starting up a small programming company for web development soon, so I have couple of questions and dilemmas in my mind. First of all should I go for standalone machines for each programmer or ...
1
vote
0answers
22 views

trying to reach a port forwarded server from the subnet using the public IP not working

I set up a server which is connected to my router. The router forwards a port of my server. So when I scan that port using http://www.t1shopper.com/tools/port-scan/ I got: 188.143.126.14 is ...