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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1answer
56 views

should a virtual interface clash with keepalived?

I was working on a server today, debian squeeze. After testing this on two staging servers, I added a virtual network interface to /etc/network/interfaces like this: # The primary network interface ...
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1answer
50 views

Changing Network Subnet Limited User Access

Our network was originally running a 192.168.3.1 /24 network with 192.168.3.1 being the gateway on a pfSense box. We decided to increase our IP range by changing the network to a 192.168.3.1 /23 ...
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1answer
34 views

HAProxy fails to connect when Shorewall firewall is enabled on web servers

I have a fairly standard HAProxy / Web Cluster setup, which is running perfectly fine - as long as I don't enable the Shorewall firewall on the web cluster servers. As soon as I do, error messages ...
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0answers
16 views

CIFS shares disconnection

On a SOLARIS system I have a CIFS share on which clients access via AD. The problem is that it desconnects (once a day maybe) when it should remain persistent. I have every time to rejoin again to the ...
1
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1answer
39 views

Connect access switches to router or core switch

My workplace consists of 4 access unmanaged network switches from three different computer rooms connected to a router. The router contains three 100mbps ethernet ports and one Gigabit (GigE) port. ...
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2answers
56 views

Node on same network cannot be reached via ping intermittantly, how to troubleshoot?

I'm connected via wire to a switch, which is connected to a router, which is connected to another server S. Normally, I can ping S, but now I get the following error: $ ping 196.168.2.106 PING ...
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votes
1answer
57 views

Do cellular network adapters (3G/4G/LTE) have MAC addresses?

We are implementing SSH restrictions by restricting by MAC address in iptables. Without the MAC address restrictions, using an app like iSSH, it's easy to access my server on the go to check on it's ...
-1
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2answers
94 views

TWO routers/modems, ONE network. Wireless Device DHCP [closed]

My company's network contains various LAN workstations and Servers, controlled by a Smoothwall firewall/gateway. Currently the Smoothwall routes outbound traffic automatically to an ADSL model (it ...
-1
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1answer
69 views

HP 570SFP+ (718904-B21) support for 1000Base-T?

I'm writing low-latency HFT application, so I want to use fast netwrok card which allows me to by-pass network stack. However 10 GB connection on Stock Exchange is too expensive that's why I want to ...
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0answers
20 views

Benchmark using netperf: At which point is the NIC and NIC driver involved?

We are hunting some performance issues on W2012R2 servers here. Some people are suspecting an issue on the network layer (LAN), or the network driver/NIC to be more specific. So they pulled out ...
3
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1answer
114 views

Ping fails with the record route option

I'm having trouble with the record route (-R) option of the ping command in Linux. It appears that when I run the command without this option, I am able to receive a response from a range of servers ...
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votes
1answer
57 views

difference between FLR-SFP+ and SFP+? [closed]

What is the difference between FLR-SFP and SFP+? For example what is the difference between cards HP 570SFP+ and HP 570FLR-SFP+? Which one it's better to buy?
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2answers
125 views

CentOS 7: Getting interface IP numbers

I am trying to autopopulate the /etc/issue in a CentOS 7 image (this will be a template, and it needs to be easy to identify the resultant VMs at a glance). I have the following in my ...
0
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1answer
40 views

Only allow a connection from specific domains

I bought a small VPS system earlier today to handle my website database, and went away for a couple of hours, but when I came back and logged in again, I found that an IP address in China had been ...
0
votes
1answer
26 views

How to find the cause of random network timetous

I have Centos 6.5 server that is having some issues with random network timeouts. It happens 3 o 4 times per day ( I couldn't identify a specific minute or hour ). When it happens, it affects almost ...
0
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2answers
140 views

Bandwidth usage per host on Vyatta/EdgeOS router

I have an EdgeRouter PoE router which runs EdgeOS (Vyatta based). I'd like to monitor bandwidth usage by host. My goal is to get a list of total downloads/uploads by host. It's not important to me ...
1
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1answer
48 views

How does this ipv4 network card understand this ipv6 listening server?

So, I just setup a new server on a droplet and looking at eth0 with ifconfig I can see that the network card is setup for one IPv4 address and one IPv6 address (IPv4 changed for protection): inet ...
0
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1answer
19 views

Automatically save documents from a scanner to a network folder

I am needing to hook up a Cannon DR225 scanner to the network at the office. We will have 3 users that are terrified of technology so I would like it if I could set up the scanner to automatically ...
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0answers
70 views

Installing phpmyadmin on rhel 7 server?

I hope someone here can help me out because I called Redhat support and all I got were links to docs that don't apply to RHEL 7 or are irrelevant. Searching Google I issued following command to add ...
0
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2answers
92 views

Using Router with DHCP and NAT and Windows Server 2012 as DNS

I have a network currently set up as per the image below. We use Regus's shared Internet and I've create a sub network for our office by using DHCP and NAT on the airport extreme router. Now the ...
0
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0answers
36 views

Adding nic to virtual machine via kvm not showing up inside machine

I'm trying to add a new nic (eth1) to a virtual machine that I have set up using virt-manager. I can use Virt-manager to add the hardware but when the machine is booted no new cards show up. What have ...
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0answers
19 views

Trunking between dell 6248p and extreme summitX440 switch

Hi Guys I'm a little bit confused and I can't seem to find what's wrong with my configuration. When I use switchport mode access on both sides, I can get connectivity. After confirming that, I need to ...
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0answers
50 views

two different ping results to the same machine, what does this mean?

I am trying to track down a network or possibly server issue, and I opened a ping to the server from my machine. I will generally receive a <1ms response for a period of time, say 10+ minutes. ...
0
votes
2answers
66 views

Wrong IP address registering in DNS

I've just taken over a small business network with 2 Windows servers. SRV2 (Server 2008 R2) is primarily a data backup for SRV1 (Server 2003); they're both DNS servers as well. Our primary LAN ...
0
votes
2answers
55 views

How to connect two building 5km apart from eachother?

I have to design a network and give an estimate of the cost of all the equipment. Now I have 3 building 100m apart which I'll connect with Fiber without a problem. Two of those though are connected ...
0
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0answers
89 views

VLAN setup Cisco SG300 and SIP gateway

Hopefully someone can shed some light here. I'm quite new to networking and not too sure if I'm doing the right thing here. We are setting up a new VOIP phone system with SIP gateway for our company. ...
0
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0answers
28 views

Networking issue in IBM x3650 after install Ubuntu 14.04

I have a problem making TCP connections after a fresh Ubuntu 14.04 installation. First of all, after booting the interface is always off. In my case the interface is manually configured and named em2. ...
0
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0answers
487 views

Need advice on Juniper OSPF networking

I have been thrown in to this project because of a coworker's termination. I have a set of Juniper SRX 550 Routers. I need to create an OSPF network that passes all traffic (All subnets) as if it ...
0
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0answers
54 views

Randomly lose the connection to router

I have been suffering with in this problem for a really long time and I'm running out of ideas. We have VMWare (Intel model server, Intel storage - Windows storage op. system, ). In the virtual ...
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0answers
54 views

Creating router between two subnets

I have created router between two subnets and installed centos on router. Below are the configuration in my router : eth0 : public ip (x.x.x.x) eth1 : internal network gateway1 (150.15.1.1) eth2 : ...
10
votes
1answer
217 views

Under what circumstances is TCP-over-TCP performing significantly worse than TCP alone (2014)?

Many admins keep perpetuating - on ServerFault and elsewhere - how bad of an idea TCP-over-TCP is, e.g. in VPNs. That even the slightest packet loss will make one suffer from at least severe ...
0
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1answer
83 views

Slow Upload Speed - CentOS 6

I've been having an issue with my servers upload speed slowing down for the last week. When it first occurred restarting the network service would resolve the slow speeds. The speed would then be okay ...
1
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1answer
30 views

Cannot view folders on client with VPN to 2008 server

Recently installed server 2008 as part of our upgrade from 2003 and managed to resolve most problems but left with the last one which is that I cannot view folders or files on 2008 server from client ...
0
votes
1answer
30 views

Firewall Rule One way smb in two network

Im trying to make an one way smb firewall rule in a MikroTik firewall rule The thing is I have two network one on 192.168.1.0/24 and one 192.168.3.0/24 192.168.3.0 is the network that should be able ...
1
vote
5answers
79 views

What software can I use to create a private network between Windows Server 2012 boxes regardless of physical location?

I have several Windows Server 2012 dedicated servers with static ip addresses. I am wondering if it's possible to create a secure private network for these machines using software only. The machines ...
0
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0answers
28 views

Extending fiber length (GPON)

How to extend the fiber length for a standard consumer-grade GPON terminal without buying special equipment? As I would think these so called GPON terminals use the cheapest multimode fiber. Are ...
1
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1answer
23 views

Linux IP Alias of different pool becomes primary

I have two different Public IP addresses of two different subnets : 1) 206.190.147.100 2) 198.105.208.3 I am using CentOS 6.5 and my configs are as follows : root> cat ...
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0answers
29 views

amazon ec2 ftp RETR hangs

The problem is with an Amazon ec2 instance "Red Hat Enterprise Linux Server 7.0 (Maipo)" (kernel 3.10.0-123.6.3.el7.x86_64) When attempting to RETR a remote file the FTP client hangs indefinitely. I ...
0
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0answers
25 views

Point to point connection not using full bandwith

Here's my network: [A]<------20 Mbit point to point ---------->[B]<-------20 Mbit point to point-------------->[C] At [A] there's a switch, at [C] there's another switch, while at [B] there's ...
0
votes
1answer
33 views

QEMU guest can access HTTPS sites, but not HTTP

So I'm configuring a QEMU guest on my Debian Wheezy server, using virt-manager. As guest I've installed Ubuntu 14.04.1 server. The server contains the following iptables rule: iptables -t nat -A ...
0
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0answers
31 views

Deny access from from/to subnet

We are running a VPC on Amazon. Our main network is 192.168.0.0/16 We have a subnet at 192.168.1.0/24 Two subnets which are entrypoints for our VPNs at 192.168.2.0/24 and 192.168.3.0/24 And more ...
0
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0answers
58 views

Configuring SoftEther on VM with two virtual ethernet card

I am very novice in networking and I just have basic knowledge. I have scenario that I'd like implement. I have a VMWare Windows 7 VM with two network interfaces. One shares the host's network using ...
0
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0answers
12 views

RX_ERR in ifconfig ouput

How can we debug the RX_ERR and find the point of the failure. I can see that number of RX_ERR and RX_DROP are the same . There isn't any TX_ERR and TX_DROP. Even when verified from the switch end I ...
0
votes
1answer
34 views

Data only seems to go one way on ethernet over usb connection [closed]

I have a router+modem combo connected via ethernet to a raspberry pi (this part works fine) The pi has a usb wifi device plugged in, and runs hostapd, does NAT and provides internet to a household. ...
0
votes
1answer
26 views

how do you query your existing ldap parameters?

ldapsearch -A locked my computer up and upchucked about 3000 unnecessary lines (not one clearly had the information I was looking for). Is their a quick summary search that will upchuck your ou, dn, ...
0
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1answer
14 views

LDAP config for Novell export

I am trying to export the email userlist from groupwise via the consoleOne export tool.. In the tool, they ask for some basic LDAP parameters that make little sense in the GUI (I dislike GUIs). ...
0
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0answers
33 views

OpenVPN network topology

I'm part of a very small startup and as such I have little money for infrastructure, etc. I need to roll out a OpenVPN service so some employees can VPN in while on-site. To give an indication of ...
0
votes
2answers
60 views

Reverse proxy on ALL ports, not just http?

Hello I recently asked a question about running multiple websites on different servers on the same network here multiple servers running the same thing, how? I have researched about setting up a ...
0
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0answers
31 views

NAT with port forwarding on same interface

I have some issues with the port forwarding on same interface. I have server1 with the public IP 5.1.1.1 and one company publish a MySQL database with IP 10.1.1.1 through VPN reached only by server1. ...
4
votes
5answers
218 views

Requests take a really long time from certain ISP

We have an Apache server with PHP running on a virtual machine. Document roots are inside the users' home folders (/home/users/{first letter}/{username}/), and /home/users/ is mounted over NFS. It ...