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
15 views

Routing particular service over vpn

Running Ubuntu 14.04 LTS. I need to connect to a SMB share that isn't local. The only way I can connect to it is over a VPN. The particular VPN service is Juniper. Connecting to the VPN is easy and ...
0
votes
1answer
34 views

Do blocking input ports increases security?

1-Do blocking unused input ports in firewall increases system security? How? (as there is no daemon listening on those ports anyway) 2-Do dropping those unused ports will positively or negatively ...
0
votes
1answer
25 views

Debugging slow network

I've been tasked with debugging why my company's network connection is running slow. Having no previous experience in this field I have absolutely no clue where to begin or what tools to use. The ...
1
vote
2answers
21 views

Why isn't my static route applying?

I'm migrating one of my services to a new public facing IP and I'm at a loss as to why the recently added route isn't functioning. This is a Server 2008 R2 box. I've covered several other questions - ...
0
votes
0answers
17 views

How to meet the arp table and the network toology with wireshark

I'm wondering if is possible meet(see) the arp table in a network traffic with wireshark or find some way to build manually the arp table, and how to see the router and swiches of topology( for ...
-3
votes
1answer
34 views

What type of switch should I get to implement a site with around 140 desktop machines, plus around 20 SIP phones?

We're moving to a new office and we will be needing to setup a network closet. I'm estimating that we will have around 140 ethernet ports and will be using CAT6a cabling for 1Gbps connections. I'm ...
0
votes
0answers
19 views

Linux: routing within 2 internal networks

We have a network that contains one gateway server with 3 network interfaces: eth0: (global IP) eth1: (internal IP 192.168.0.0/24) ib0: (internal IP 10.2.2.0/24) The other servers in the network ...
0
votes
1answer
23 views

Apache + mod_ssl (on Vagrant) HTTP connection works fine, HTTPS connection times out

Introduction Hi guys, this is quite a strange one that I've been battling with for a few hours now. I have a CentOS Vagrant box with a network adapter attached to my NAT (as opposed to host only). I ...
0
votes
0answers
16 views

Is it possible to use listening socket for initiating client connection?

Today I noticed such a situation: [root@cwf-hmaster.staging-scp ~]#netstat -taupen | grep 54310 tcp 0 0 ::ffff:10.0.12.209:54310 ::ffff:10.0.12.209:54310 TIME_WAIT 0 0 ...
0
votes
0answers
18 views

TCP/UDP Small Package Size optimization

I currently have the problem, that when a LOT of RTP streams (>800) go to one server the max. speed is onlynabout 70-80 Mbit (on a Gigabit LAN - all Hardware components are Gigabit components) 130 ...
1
vote
1answer
20 views

iptables destination NAT from one range to another

I am trying to make destination NAT from one range (192.168.2.0/24) to corresponding ip addresses in another range (192.168.1.0/24). I have managed to do this ip by ip iptables -t nat -A PREROUTING ...
-5
votes
0answers
20 views

putty in Linux for router serial connection, tty, com? [on hold]

want to access Putty on Linux for setting up a router ,but once I opened the window I found it difficult to select the port type for the serial connection which I'm having with the router, The first ...
0
votes
1answer
13 views

Don't connect to OpenVPN when on internal network

We have an OpenVPN server - it's physically running in our internal subnet. Basically the when the VPN client connects, he gets an IP from the VPN's subnet and a route to the internal subnet is pushed ...
-6
votes
1answer
37 views

encryption of fiber communications [on hold]

We have to connect one site to another using leased fiber ( theoretically it's a dark one ) in order to replace a radio link. All servers are in one site. Both location now have Gigabit networks. Can ...
0
votes
1answer
17 views

Dynamic port forwarding reports connection failed and timeout

I'm running a benchmark based on selenium to send requests to an application server. Since the application server is deployed on a private cloud, I'm not able to connect to the server from the ...
0
votes
0answers
23 views

F5 BigIP limiting the amount of sources able to connect to a virtual server

I have a public facing virtual server on an F5 bigIp LTM but want to limit the possible sources able to connect this virtual server to 3 ip addresses, none which are not in the same ip range. Do I ...
1
vote
1answer
21 views

Can't access KVM Host (network brige)

I have a strange problem since I rebooted my KVM Host running CentOS 7. I have a network bridge which was going fine, I could access my KVM hosts and guests, but since reboot, I can't access the ...
-1
votes
0answers
24 views

Building a Network [on hold]

Can anyone help or give me an idea of where to start with this? I am so confused on how to do this Use Microsoft Visio to create a network diagram for the Accounting Office. The Visio document needs ...
1
vote
0answers
12 views

Dell PE2900 seeing only 1/2 ethernet controller

I have 2 ethernet controller on my dell poweredge 2900 : http://www.dell.com/downloads/emea/products/pedge/en/pe2900_Spec_Sheet_Quad.pdf But I only see one on my linux system : $ ip addr 1: lo: ...
-1
votes
0answers
23 views

Grouping different interfaces to the same network on vyatta

Hey guys I access a vyatta router and I join the eth0 which has the subnet 10.100.100.0/24. There is another interface on vyatta (eth1) which has the subnet 198.18.103.0/24. I would like to know how ...
0
votes
0answers
1 views

Using a Barracuda F400 Firewall Router Without a Modem

I'm looking into a problem where VoIP phones don't ring for some of the incoming calls that I believe might be due to the network configuration. Do you need a modem if you are using a Barracuda F400 ...
1
vote
0answers
22 views

How to create a link between GNS3 and a VMWare Workstation VM that is totally isolated from the physical host?

My physical host machine runs windows server 2012 R2 with a DHCP server. I have the following topology in GNS3: Windows Server is the physical machine, it is connected to both VMNet 2 and VMNet 3 ...
5
votes
0answers
48 views

POST of MTU + ~798 bytes gets lost

I have a very weird issue with certain packets not arriving on the destination host. It happens when we transmit a POST that is somewhat larger than the MTU. We can reproduce it with this script: ...
0
votes
0answers
24 views

Solaris 10 inside KVM (Ubuntu 14.04) - network card not working

I have a problem with getting network running on a Solaris 10 guest running on a Ubuntu 14.04 kvm host. Installation of the guest runs fine but I can get no network connectivity from the guest to the ...
-1
votes
0answers
34 views

Should I have to use internal ip's on my hosted network? [duplicate]

I have 3 servers on a small hosting company. They are on the same network. Lets give them names for simplicity. a.example.com b.example.com c.example.com All are windows server 2008. If I telnet ...
3
votes
1answer
22 views

Windows Server to Server copy, executed remotely, process overview

Ok so I've got 3 servers in this example Server_A, Server_B, Server_C I want to move data over the network from Server_A to Server_B by executing a batch script on Server_C, it would be something ...
-1
votes
0answers
9 views

Routing based on source ip + anycast bgp

Client A pings ip X > always server 1 Client B pings ip X > always server 2 Random client pings ip X > always nearest server (1 or 2) Anycast DNS Using BGP Tutorial explains the last ...
-3
votes
0answers
15 views

ICMP admin prohibited message [closed]

me and a friend are working on an assignment for school. We have to analyze different kinds of packets of different messages. One of them is to capture a packet with the message admin prohibited. The ...
2
votes
0answers
26 views

Which openstack instance has a certain IP address

There are IPs on my network that are not configured as fixed or floating in Neutron, they are simply claimed by an instance (e.g. via ifconfig eth0:1 ip.add.re.ss). How do I get openstack (possibly ...
0
votes
1answer
14 views

What better solution to adopt for client server system implementation by java sockets

I need some advice from someone experienced in networking. I have already created a system designed to monitor some tasks (5-30) that are written in java started by a auomatic scheduler or by ...
-1
votes
1answer
38 views

what ports are used for files transfer in the lan?

when I'm using Ethernet LAN....many things you can do on the LAN, one of them is to transfer files between computers after sharing the files.....the question is : what ports are used for files ...
0
votes
1answer
29 views

Set gateway for specific ip destination and port

I have two internet connections. One has a static public ip address (WAN-STATIC gateway ip 10.0.0.1) and the other has a dynamic public ip address (WAN-DYNAMIC gateway ip 10.0.0.254). I wish to force ...
-1
votes
1answer
24 views

Geo distributed ip [duplicate]

When i ping 8.8.8.8 from my home computer (europe) i get around 26 ms latency. When i ping 8.8.8.8 from a server(US) i get around 1 ms latency. When i ping my (US) server from home (europe) i have 130 ...
2
votes
2answers
42 views

Running own DNS in intranet, how to reach outside DNS from clients

The Scenario: I am creating a Network for 8 Windows 7 Workstations running in a Student Laboratory. They are supposed to browse the internet, but not to be reached from outside their intranet. To ...
-1
votes
1answer
60 views

What should an Ops person know about hardware for an interview? [closed]

It is easy to find typical interview questions for sysadmins and network engineers, but when I search for hardware engineer (hardware operations engineer) I can't even find one site with typical ...
-2
votes
2answers
52 views

Are Add-On 10gb Nics Legit? [closed]

Sorry if this is product specific but I'm not sure where else to ask Are these AddOn nics legitimate 10gbE, or does anyone have any experience with them. There about 1/100th of the price of the ...
0
votes
1answer
9 views

Can I connect many on-prem sites to the same virtual network in Azure?

Here's a scenario: I have two branches in my company. One in Toronto, the other in Montreal. I have an Azure virtual network containing a variety of resources. I want to connect both of my branches ...
1
vote
0answers
11 views

What is the difference between an Up MEP and a Down MEP for Ethernet OAM CFM?

I'm having trouble understanding the functional difference between an Up MEP and a Down MEP in CFM applications. Some sites say they are defined based on network direction, others seem to think they ...
1
vote
0answers
21 views

Hyper-V VMs keep losing network connection

We had a major power loss in our server room two days ago and several Cisco Nexus 2232PP FEX devices went down. We were able to get everything back online, but since that event we've been experiencing ...
3
votes
1answer
75 views

How do I make a connection private on Windows Server 2012 R2

After a restart of one of our servers (a Windows Server 2012 R2), all private connections become public and vice versa (this user had the same problem). Stuff like pinging and iSCSI stopped working, ...
-1
votes
0answers
17 views

Unable to ping a computer with the same IP-range in another network through routers in the middle [on hold]

I have two routers that are connected to each other through Ethernet. Their WiFi-interfaces are broadcasting two networks with same ESSID, IP-range and subnet-mask, using different channels. The ...
0
votes
2answers
45 views

(network unreachable) error in my server logs

I'm getting lots of network unreachable lines in my Centos' messages log file. They seem they can't resolve to certain addresses which I do not have any ideas why my server has to resolve to them in ...
-1
votes
0answers
26 views

Direct port 443 to 8443 on using ip6tables only? [duplicate]

I am running CentOS 5, running Kernel version 2.6.18 & ip6tables v1.3.5. IPv6 is enabled. I would like to use ip6tables to direct traffic from port 443 to the internal port 8443. We did this on ...
0
votes
0answers
19 views

How to enable VLAN on a Tomato router, and use for vSphere. [on hold]

I saw a question asking "What is a VLAN?" So I guess the only stupid question is the one not asked. I somewhat understand how VLAN works, but not physically. I have my router on the main floor -- ...
2
votes
0answers
38 views

Non-local IP for next hop in routing

I'm working with an MPLS network and I am slightly confused about some route entries. Interfaces are (these are fake IPs): eth0 10.10.10.1/24 (LAN) eth1 10.9.9.1/24 (MPLS) eht2 2.2.2.2/24 ...
0
votes
1answer
28 views

Input traffic spikes on outside interface at same time every day

For the last two days I've had this issue where our internet connection SLOWS to a crawl and is almost unusable. I logged into our Cisco ASA 5500 (not very well versed with it) but I was able to see ...
0
votes
1answer
25 views

Cannot access Windows default shares using windows credentials

I am on (Windows 8 -ADMIN-PC) (192.168.1.10) with DNS. My other PC (windows 7 -USER-PC) (192.168.1.11) with same DNS In my PC (Windows 8 -ADMIN-PC) I try to access user-pc by using windows explorer ...
0
votes
1answer
8 views

Forwarding traffic from one virtual interface to another

I have a router with two ethernet interfaces: eth0: 1.1.1.2 (with 1.1.1.1 gateway) eth1: 2.2.2.1 I created two new virtual interfaces: eth0:1 : 1.1.1.3 (with 1.1.1.1 gateway) eth1:1 : 2.2.3.1 ...
1
vote
0answers
28 views

Redirect Default Gateway Traffic in Linux to File

I am trying to troubleshoot one of my linux servers (ubuntu server). Therefore I want to intercept all traffic that is sent to the default gateway and then write it to a file: preferably some kind of ...
-1
votes
0answers
17 views

Intermittent VPN connection in VM [closed]

I have a Virtualbox VM running Ubuntu on my Win8 host. It uses NAT for the network. When I connect to my VPN on the host machine, the VPN connection from within the VM is really spotty. To do ...