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

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29 views

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

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 ...
2
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1answer
16 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
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0answers
6 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 ...
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votes
0answers
15 views

ICMP admin prohibited message [on hold]

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
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0answers
25 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
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1answer
12 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 ...
0
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1answer
34 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
22 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 ...
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1answer
23 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
36 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 ...
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1answer
57 views

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

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 ...
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votes
2answers
47 views

Are Add-On 10gb Nics Legit? [on hold]

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
6 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
7 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
19 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 ...
2
votes
1answer
60 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
16 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
37 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
23 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
18 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
34 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
24 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
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1answer
23 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
27 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 ...
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0answers
17 views

Intermittent VPN connection in VM [on hold]

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 ...
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votes
1answer
35 views

3 NICs in VMware ESX 5.5.0 cannot connect to each other [on hold]

I have a Vmware ESXi 5.5.0 hypervisor, installed on a desktop pc with 3 physical NICs. The first NIC is connected to the internet (WAN), the 2nd and 3rd NICs have Access Points installed (plugged in) ...
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votes
0answers
17 views

lost pings and after replug works fine

I have an strange problema, on one floor, the computers randomly lost internet, I checked and I see that if I made a ping, it lost 90% of packets, I changed the switch, the computers Works fine before ...
-1
votes
2answers
56 views

Why can my servers not access their own addresses? [duplicate]

I have two VMs on CentOS 6.5, running Plesk 12, and the webserver is Apache 2.2. One is a clone of the other, and I inherited them setup by someone else. My problem is that I can access my sites ...
0
votes
0answers
20 views

base filtering engine fails to start - error 5 access denied. Server 2008 R2

We had a major server fault over the weekend where some hard drives and the mainboard's raid controller failed. Mainboard and HDD's replaced - the Windows Server 2008 R2 is loading up, but many of the ...
0
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1answer
41 views

iptables not allowing ssh

This is my iptable configuration. But I cannot connect with ssh with these rules. What am I doing wrong? I want to block all traffic except ssh coming from x.x.x.x ip address. iptables -F iptables -X ...
0
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0answers
8 views

whilst on a vpn cannot access some cdn sites [closed]

I use windows 7 machine and a VPN to access a remote work computer. This worked fine and I was able to also access skype simultaneously on the home machine (to take a work call with smooth sound) and ...
3
votes
1answer
38 views

Cisco CVE-2014-0224 Vulnerability

We have a Cisco RV-042 Small Business router and our PCI scans flagged it as being vulnerable to CVE-2014-0224 (CCS Injection/Man-in-the-Middle). It appears to be another OpenSSL vulnerability. We ...
-4
votes
1answer
32 views

can same private IP will communicate? [on hold]

Suppose Company A's Lan's network address is 192.168.10.0/24 and B's LAN network's address is 192.168.10./24. when company A brought company B..then as usual they also need to make communication ...
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votes
3answers
34 views

understanding resolv.conf nameserver through system calls [on hold]

I am trying to understand how /etc/resolv.conf /etc/nsswitch.conf exactly works and what is significance of nameserver entry 127.0.1.1 I did strace ping google.com to get to know about the system ...
1
vote
3answers
52 views

Test port reachability from a remote host even though the port is not bound to a service?

I need to check whether a remote host is able to reach a specific port. At the time of test the service bound to that port will be down. The possible issues that the test would address would be : ...
0
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0answers
26 views

CentOS 7 (Dracut) - Network boot with gateway in different subnet

I'm trying to auto-setup VM guests with CentOS 7 using network boot and kickstart with external network connectivity based on linux bridge. And I'd like to have solution lightweight, simple and ...
-5
votes
0answers
36 views

Website that is active occasionally can’t be accessed on browser [closed]

I'm having an issue where when browsing my website it will suddenly go to cannot display page. It's running Apache on CentOS 6. The weird part is the server is fine to my knowledge and actually only ...
-2
votes
0answers
35 views

WAN speed vs internet [closed]

Why does it happen that if I open a webpage hosted by a server , which is a part of WAN (Access Network) , it takes longer time to open than a webpage hosted on internet. Technically , a webpage over ...
0
votes
0answers
25 views

Why is the first of two post-up commands for routing in interfaces configuration not automatically processed

We managed to connect our servers to two distinct networks and everything works fine. We use routing rules that ensure that server responds to the right network. I followed the instructions under ...
-4
votes
2answers
45 views

How to force the network machines to get the ip from a DHCP server? [closed]

How can I force all the network machines to get the IP from the DHCP server and prevent them from manually editing the network configuration. There are both Linux and Windows machines. The DHCP server ...
-9
votes
2answers
38 views

is it possible to have Web server and NAS on the same hardware microsever? [closed]

I have a HP microserver proliant gen 8, and i want to know if there's a way to make this hardware work as NAS with freeNAS ... etc, and in the same time make it work as a web server with Centos Nginx ...
1
vote
0answers
17 views

Receive many UDP packets & ksoftirqd load

I want my server to be able to handle more than 1Mpps from a 10g card. Is it possible? I have Ubuntu 14.04 with kernel 3.11 and a 16 core Xeon machine. It seems that ksoftirqd becomes bottleneck in ...
2
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2answers
80 views

Can PoE kill unmanaged switches?

Two simple unmanaged switches have died in the same cabinet in two years, one at 18 months and one just today at six months. Both times we gradually experienced increasing intermittent verified ...
0
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2answers
55 views

Is there a way to find which IP I am connected to?

Let's say my eth0 interface has multiple IP addresses and I can connect with SSH to any of these. Is there a way to find out which of those I am connected to? (The background is that certain ...
0
votes
1answer
60 views

How to trace dropped TCP connections?

Trying to help someone with a situation where TCP connections get mysteriously dropped after a few minutes for no apparent reason (this happens even with non idle connections). Both client and server ...
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votes
1answer
42 views

How can I access a Virtual Machine on different subnet? [closed]

I have two virtual machine VMachineA and VMachineB using virtual box. VMachineA (CentOs 6.5) has two network interfaces: eth0 (IP: 192.168.3.48, GW: 192.168.3.1) and eth1 (IP: 10.10.200.1). ...
0
votes
1answer
27 views

tomcat-webapp not accessible via port after windows-update

we are running 4 Virtual Machines on a MS HyperV Host. On one of the VMs (192.168.50.15) we have multiple Tomcat-Webapps on separate ports - 9010: Jenkins - 9020: Atlassian Jira - 9030: Wiki .. ...
0
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0answers
25 views

Proxmox VE: Multiple shared public IPs with NAT configuration

I have a Proxmox VE (v3.3 @ Debian 7 Wheezy) and got 3 public IPs routed to that server. It is my aim to have multiple VMs sharing those IPs using a NAT configuration so that I can forward single ...
0
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1answer
92 views

BIND failing to resolve with 'WARNING: recursion requested but not available'

there are no errors in the logs and query logging won't initialize iptables is fully disabled but the server will respond with "WARNING: recursion requested but not available" because my client ...