Tagged Questions

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

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0
votes
1answer
13 views

iptables: service per physical interface

I have a vm on which I'm trying to configure (unsuccessfully) one service per physical device - i.e. ssh open only on eth0, http only on eth1 and ftp only on eth2. This has to happen regardless on the ...
1
vote
1answer
25 views

Why do I see so many ssh packets in only a couple seconds?

I am learning how to use tshark so I can better understand networking. As a user the protocol I most often use day to day is SSH. So I thought I'd start a capture filter on ssh packets on my server ...
3
votes
2answers
153 views

tcpdump truncates to 1472 bytes useful data in UDP packets during the capture

I am writing an application which work with network. To perform some tests I need to reproduce the flow which I had a day before. But at the same time it is not allowed to stop the current working ...
-4
votes
0answers
19 views

Open Source Software for Proxy Server [on hold]

I have a server that is accessed from two separate networks, one network is in the US, the other is in the Philippines. I'm looking to set up a proxy server at the US site so that all information from ...
0
votes
0answers
13 views

How do you configure CoreOS multi-region Geocluster?

How can I configure 2 CoreOS nodes on different networks? One node is in Amsterdam (Master) and the other is in New York: Master Public Network IP Address: 128.199.33.32 Gateway: 128.199.32.1 ...
0
votes
0answers
19 views

Good Internet connection, but websites load slowly or not at all and internal web server presents same issue to outside users

Lately, users in my organization have been having problem accessing web pages. The browser status bar will say "Waiting for [site]" or "Downloading...", but pages never load, or only load partially ...
-1
votes
0answers
11 views

Route Windows application to specific network interface [migrated]

I have two connections (one wired, one wireless, if relevant). One connection passes thru a proxy (which is not under my control) and is domain controlled. The other is a simple wireless connection ...
0
votes
0answers
9 views

Connect OpenWRT router, root server and roadwarrier via VPN

I want to connect a private LAN (connected over an OpenWRT router via DSL), a root server on a hoster and different roadwarrior together to one VPN. On the root server (Debian Wheezy) I´ve installed ...
0
votes
0answers
3 views

shrew soft vpn client routing to another network

I have configured Shrew soft VPN Client on Kubuntu 12.04.3 and is connecting to CISCO RV042. The CISCO router is connected to LAN 10.66.11.0/255.255.255.0 and also connects to another CISCO router at ...
-2
votes
0answers
20 views

How a client knows which DHCP server to connect? [on hold]

I am a Computer Science and Engineering student. My College has a well configured DHCP server which gives IP address to all its clients (students PC). We connect to internet via Ethernet cable. Now ...
-4
votes
1answer
18 views

Setup network between 2 computers connected using wifi [on hold]

In my office I have a WiFi Router that allows 2 computers to connect to Internet. I have 2 questions - How can I create a network between these 2 computers for file sharing? Can I access SQL server ...
-1
votes
0answers
8 views

How to use iptables and ebtables to limit qemu access to a set of IPs?

I want to limit the access of a VM (backed by QEMU) to a few IP address. The VM has a private IP received from dnsmasq. The guest is connected to outside through a bridge. To limit the access, I need ...
2
votes
1answer
36 views

Can't access Exchange OWA from Wireless Subnet - Firewall rule?

The Problem The issue is that I can't access port 80 (or 443) on the Exchange server, unless I add a blanket rule to allow all traffic from the client to the server's subnet. If I add a rule to ...
0
votes
2answers
49 views

Why would a public subnet be used here?

I'm a former DBA/Developer who now handles all IT aspects in a new role, more by chance than design - you know, "he used to be in IT so obviously he can handle everything" type of thing. I've set up ...
0
votes
1answer
16 views

KVM Isolated network between host and guest fails after few hours

I have a KVM CentOS host with several CentOS guests. All of the guests are using a bridge for network communication. The guests have been up and operational for several months and work properly. The ...
-1
votes
0answers
20 views

Internet not working on server and getting system lacked sufficient buffer space or because a queue was full [on hold]

My ASP.NET and SQL Server 2012 application is running on Windows Server 2008 R2. Suddenly, my internet on server stopped working and my application throwing, An operation on a socket could not be ...
0
votes
0answers
10 views

IIS7 HTTP Redirect not working correctly for my use

quick overview of our network. One WAN IP, two win 2k8 web servers. Initially one was for our public sites, the other was for our internal sites. Using a router as a firewall / NAT device. We now ...
0
votes
0answers
10 views

Realtek dongle not working on beaglebone [on hold]

I have a Beaglebone Black and Wifi dongle that refuses to work with it. lsusb Output: root@beaglebone:~# lsusb Bus 001 Device 002: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN ...
0
votes
0answers
13 views

Connect Multiple Users Behind same NAT l2tp/IPsec

I have installed OpenSwan on CentOS 6, the clients connection to the server is successful and when i direct my browser to http://whatismyipaddress.com on the client it shows the public ip of the ...
1
vote
0answers
61 views

Is it normal for uploads on ADSL to make the connection unusable (> 4000ms latency)? [migrated]

I have an ongoing saga with my internet connection; where the latency periodically goes through the roof. In most cases, this seems to coincide with something uploading data. I'm not having a lot of ...
0
votes
0answers
23 views

pfsense access openvpn client´s lan

I want to cover the following case: pfsense server´s LAN: 10.1.0.0/24 openvpn client network: 10.2.0.0/24 Local network of one openvpn client: 192.168.2.0/24 Working: Access the network ...
0
votes
0answers
44 views

Forwarding traffic from one ethernet interface to another

Earlier, I was trying to get traffic from one ethernet interface to another without using a bridge. Here is a link to the solution : ...
-1
votes
0answers
30 views

Send traffic out the right interface (Linux) [on hold]

I have two interfaces (wan and wan2). I want to use wan2 interface to connect to only one port (for example 9999). I do not want to use it to connect to other ports. Connections to the rest I want to ...
0
votes
0answers
4 views

wget is unable to resolve host address 80% of the time [migrated]

I have a wget 'http://xxxx.net/somepage.asp?params@abc' in a bash file. When I run it, four out of five times it says: Resolving xxxx.net (xxxx.net)... failed: No address associated with hostname. ...
0
votes
0answers
23 views

How to find Access Points that work with mDNS and have companies prove it [on hold]

I'm part of the tech department at a non-profit that does media education and professional development for youth. We are in the process of upgrading our 8 PoE wireless access points. Our old HP ...
0
votes
0answers
14 views

Azure VM belonging to multiple cloud services

I am brand new to Azure and still trying to figure everything out so please excuse my ignorance. I'm trying to take one VM running IIS and to host multiple websites on it, each with a different SSL ...
0
votes
0answers
5 views

Can't reach Ubuntu guest vm from Windows host using VirtualBox Host-only interface [migrated]

I used to have this working, but had to reinstall VirtualBox this morning. I have Windows PC with VirtualBox installed. I have an Ubuntu VM. I am unable to access services on the Ubuntu VM from the ...
0
votes
0answers
8 views

issue with QSFP+ to 4x SFP+ cable

I have a Gigabyte MD60-SC0 motherboard which has a QSFP+ port. I need to connect this with another machine I have which has a Intel X520-SR2 NIC (with two SFP+ ports) plugged in. I also have QSFP+ to ...
0
votes
0answers
19 views

Can't Ping External Servers [on hold]

I can't seem to access any external servers from my server, however my server can be reached. I am using Arch Linux. Trying a simple sanity check I found the following: ping google.com ping: unknown ...
-1
votes
0answers
16 views

Linux router under VMware can't contact physical gateway server intermittently

We're a site with upwards of 800 concurrent users with most services hosted on the Internet and a BYO service to facilitate access to these. Situation is some days - not everyday - we're seeing our ...
0
votes
0answers
4 views

I want to Host My Website from My Home Network [migrated]

I want host my simple Html Site on my Home Network using Apache Tomcat 7 I have domain which is perfectely pointing to my router's IP Address I did forward my port (Router Port) Like below Screen ...
0
votes
0answers
3 views

DDWRT router's DDNS update fails when using Static IP as Wan connection [migrated]

In my network I have two routers. 1 normal router (ADSL, given by ISP with iptv preconfigured ). 1 Asus router with DDWRT. I have set the DDWRT router to set DDNS (open dns through dnsometic). The ...
0
votes
0answers
80 views

VMs on ESXi system, only able to use internal IPs

first off I am a bit of a network newb, I know the basics but that is about it. So I have a ESXi server running a few VMs. The set up is; -Master IP (controls the ESXi box) -Internet IP (for general ...
0
votes
1answer
32 views

Server 2012 Can't Ping Local Network

I have four Windows Server 2012 servers hosted on ESXi 5.5. The first one is the firewall box with two network adapters. One with an external connection to the internet, that is shares its connection ...
0
votes
0answers
5 views

Packet forwarding for guest VMs not working [migrated]

I'm am running some VMWare Fusion VMs on OS X, and I'm having trouble with networking. OS X has a Wifi interface with two IP addresses: en0: ...
0
votes
2answers
64 views

How does Linux pick which network interface to use?

Let's say I have a machine with two network adapters on different subnets, eth0 (10.0.100.5) and eth1 (10.0.200.5). Assuming both subnets have routes to the internet (though their own NATs) and to the ...
0
votes
0answers
56 views

Unable to ping or access local device

I have a very strange problem where I can't ping a router acting as client from one pc but at the same thing I can from another pc which are both connected to the same router. I have Router-1 ...
-1
votes
0answers
17 views

How to setup public IP on localhost - Ubuntu [closed]

I have configured my Ubuntu server on localhost and got my router configured from my isp with IP. But I unsure how to configure it to make the server live. Can anyone please help me with ...
0
votes
0answers
20 views

Check concurrent connections per user on OpenVPN server

I have an OpenVPN server running on a dedicated server and I want to know how many connections each user has open with the server. To test, I made it so im the only one that can login, and then ...
0
votes
0answers
23 views

Elastic IP Not Resolving to Windows Instance

I'm sure I'm just missing a step, but I can't figure out how to get server to resolve to new elastic IP address. I appreciate everyone for their help. I've been trying to figure this out for a while ...
-2
votes
0answers
11 views

Access my own Virtualbox' services? [migrated]

Basic newbie question and I did search a bit. I have Windows 7, installed Virtualbox, installed Ubuntu 14.04 in it. It runs fine and I can sudo apt-get just fine. What I want it for is its LAMP ...
-1
votes
1answer
24 views

Interent Connection stop and reconnets intermittently, while ping requests go through [closed]

Good day all I will keep this short, for the past week my internet has started becoming jittery, It will work fine then suddenly it will "go off", how I know this is my google drive says cannot ...
0
votes
0answers
16 views

Data centre to data centre network performance compared to Users [closed]

I am creating a B2B web app/API as a product, which the client will connect their systems to directly. Light, but frequent payloads so latency is important. Is there any rough way to find out how the ...
2
votes
0answers
28 views

How to route traffic through different interfaces based on the port number?

iptables -A PREROUTING -i usb0 -t mangle -p tcp --dport 8080 -j MARK --set-mark 1 iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain ...
2
votes
2answers
56 views

Intermittent host and VM connectivity on ESXi standalone

I have a standalone ESXi 5.5.0 b2143827. It is running on a Dell R710 with 144GB of RAM. It has approximately 20 VM's on it. Right now, I cannot get onto the console via the VMWare vSphere client or ...
0
votes
0answers
26 views

discover BYOD on network powershell - basic [closed]

I am interested to learn how to discover/monitor network - on a windows domain. I have don researches but not much luck. I know that on my dchp list I can see all the devices that request IP addresses ...
0
votes
0answers
28 views

Can't reach shared folder from VM over VPN

My network knowledge is a bit lacking so I'm looking for some help on why we can't access a shared folder. We have a Windows 8 VM on a Mac host that is sharing a folder that we want accessible from ...
1
vote
1answer
65 views

Is there a netstat -s equivalent for windows?

I know that netstat -s exists on Windows, but it displays way less informations than on Linux/OS X. It only gives 8 counters about TCP, while on Linux it's more than 50. I'm looking for any ...
2
votes
1answer
52 views

DHCP reservations for a range of MAC addresses

Question Our DHCP server is set up to only give IP addresses to machines that it knows about (all IPs excluded, reservations for each MAC address). Part of the address range is used for virtual ...
-1
votes
3answers
50 views

Branch office Connectivity issues

We have two offices. One in The Netherlands and one in India. In each office we have pretty good internet connection (~20Mbps). The major problem we face is cross office connectivity. Skype calls ...