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
65 views

How can my server announce its presence to everyone in the network [closed]

The situation is as follows. I want to have an application running on a server. All of the desktops in the company has to connect to it. But I do not want the IP address of the server to be hard coded ...
1
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0answers
35 views

HP ConnectX cards identifying as ConnectX EN

I bought a lot of four HP branded ConnectX card on Ebay. The cards are : HP InfiniBand 4X DDR ConnectX PCI-E Gen2 Dual-Port HCA 483514-B2 My problem is that two out of four cards identify themselves ...
1
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1answer
23 views

Win7 VM network is flaky after migrating from Hyper-V 2012 to 2012R2 and upgrading integration software

I'm in the process of upgrading our Windows 2012 Hyper-V hosts to 2012R2. As part of this process, I am migrating existing VMs from the 2012 hosts to hosts that have already been rebuilt. These are ...
5
votes
3answers
268 views

Gbit uplink vs Regular switch port

I have a 10/100/1000 24-port + 2 mini-GBIC ports switch which I have to link to other switches. Unfortunately, on the other switch all the mini-GBIC slots are taken up, so all I can do is link them ...
0
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2answers
36 views

How to use the new ifdown and ifup?

I would like to change the MAC address on a Fedora 2o webserver, but it seams that ifdown and ifup doesn't work like they used too before systemd were introduced. This is what I would like to do ...
0
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1answer
36 views

Configure IPv6 on FreeBSD webserver

Seems I just can't nail the right rc.conf configuration for IPv6 on my FreeBSD 10 VPS. I'd like to go completely IPv6 and tutorials/instructions i followed aren't really working for me somehow. It's ...
0
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1answer
34 views

openvswitch with multiple vlans

I'm having an issue wrapping my head around a setup. We currently use vmware+vsphere and switching to kvm. So we want the similar type setup using openvswitch. So our setup will be like kvm host ...
1
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1answer
46 views

Cannot communicate with network on second NIC

I am running XenServer 6.2 with two NICs on separate subnets: xenbr0 : 192.168.1.50 xenbr1 : 192.168.0.50 The .1.50 NIC communicates with an internal network and works perfectly. The .0.50 is ...
0
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2answers
86 views

Strange data in HTTP request

I have a HTTP server that serve many short time connections from many clients, the server logged that there are some invalid HTTP requests, so I decide to capture the network traffic. This is what I ...
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0answers
29 views

DNS server won't work! [Bind9 running on Debian 7; virtualized through Proxmox 3.1] [migrated]

First I'd like to thank everyone in advance for helping me - communities like this are exactly what amatuers like myself need when faced with perplexing issues. I've recently begun virtualizing ...
1
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1answer
27 views

DNS caching for a DNS name with two different IP addresses (internal vs. external)

Suppose we have a DNS entry ocean.corp.tld internally pointing to an internal IP address on our corporate network, and externally pointing to an external public IP address. Essentially same DNS name ...
0
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0answers
4 views

Guest VMs unable to ping each other within a custom host-only network in vmware workstation [migrated]

I have created a custom host only network VMNet2(without dhcp) in VMware workstation and connected my three VMs with this network. But the problem is I cannot ping any VM from any other VM, However I ...
0
votes
1answer
92 views

adding a third subnet on the same router

cisco 2800 series (isp cross connect)Eth0/0 192.x.x.x 255.255.255.252, Eth0/1 192.x.x.x 255.255.255.224 ##Eth0/1.1 192.x.x.x 255.255.255.128 <--- want to add this block in!## I've been granted ...
3
votes
1answer
76 views

Remote Desktop (RDP) configuration for a web farm

Firstly my background is more skewed towards programming rather than network maintenance so please bear with me. OK here's the problem.. I have 5 physical servers co-located in a data-center. Each ...
1
vote
1answer
25 views

ssh connection freeze after password phase

I'm trying to connect to a server (Oracle Linux 6.3) and after I insert the password the session just freeze. I checked the audit log and I've authenticated successfully, after I restarted the ...
-2
votes
1answer
52 views

Out of IP address on DHCP 192.168.1.2 to 192.168.1.254 [duplicate]

Hi I have 250+ workstations on IP's from 192.168.1.3 to 192.168.1.254 subnet 255.255.255.0 gateway 192.168.1.1 and our server on 192.168.1.2 We are expanding and need to add another 254 IP's but this ...
12
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2answers
192 views

How should I temporarily disable IPv6 for an entire network?

We have a medium sized network with IPv4 and IPv6 across it, and our upstream provider is making IPv6 go away for two weeks while they do... something. (It's "experimental" and we don't pay for it, ...
1
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0answers
42 views

upstream timed out (110: Connection timed out) while connecting to upstream

I have my backend in France and one of my frontend servers is in Japan. This issue doesn't happen with any other of my frontends, only this Japan server, which already has about 2s latency from most ...
0
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1answer
28 views

Using OpenVPN and iptables in combination

Let's imagine there are three networks, WAN, LAN-A and LAN-B. In between, there is a firewall server connecting the networks to each other. iptables ensures the following things: There is no way for ...
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0answers
30 views

Network Load Balancing (NLB), how to assign a public IP?

I have two web servers that I am trying to configure in an NLB. I have so far managed to get the NLB working on a private network range but I now need to expose this on a public IP. My servers ...
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1answer
49 views

Designing a secure network layout

Over the last few years I've accumulated a lot of hardware that all currently exists on a flat network. There are a number of devices: my desktop, laptop, and computers of the rest of the people I ...
4
votes
4answers
170 views

Monitor an internet link to a remote host

I have a Debian Wheezy server running Xivo (let's call it A), this server has 2 interfaces: eth0 and eth1 . There is no default gateway and only a few servers are statically reached from A. eth0 has ...
0
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0answers
26 views

Access switch on the LAN from a WLAN connection Sonicwall TZ205

I have a setup like the following Modem >>> Sonicwall TZ205 >>>> Linksys 8 port smart POE switch >>>> Linksys LRT224 When I am on the LAN through a wired connection ...
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1answer
36 views

Force network messages from VM's on same ESXi to gateway

In the context of introducing ESXi we would like to know if it is possible to force messages destined from VM_A to VM_B on the same ESXi towards the gateway. The reason behind this seemingly strange ...
2
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4answers
362 views

DNS A record pointing to private IP address [duplicate]

I own a domain. I will call it example.com. I want to set up a local BIND server on my private network. I have a box with the private IP address of 192.168.2.13 I would like to have this box named ...
3
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2answers
541 views

Are transceivers hot swappable?

Are transceivers in general hot swappable, and if not, how do I find out if these are? Using these adapters 665243-B21, HP Ethernet 10Gb 2-port 560FLR-SFP+ 665249-B21, HP Ethernet 10Gb 2-port ...
1
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2answers
34 views

How can I change metric of public network in route table

In my windows 8.1 ENT [64 bit] machine I have 3 network adapters. Ethernet 1 is connected to public network and other 2 ethernet adaptors are connected to different internal networks. The problem is ...
0
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0answers
23 views

Postfix+DKIM using Amazon's second private IP address

I use Amazon EC2 with 2 private IPs. I have 2 postfix instances (using multi-instance builtin support) with opendkim. Each instance works when I send email (over telnet) using the primary private IP ...
0
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1answer
35 views

Trunk port needs to be tagged or untagged?

I linking 2 different brand of switches (Linksys & Zyxel) through SPF gigabit connector. g4 1G-Combo-F Full 1000 Enabled Off Up Disabled Off It says the link is up but ...
0
votes
1answer
84 views

Is it possible to make the server accessible from two internet connections

how to make this: have: Centos 6.5 WAN1 eth0 44.44.44.44 (DEFROUTE=yes) WAN2 ppp0 95.95.95.95 (DEFROUTE=no) HTTP server work and available only in eth0 DNS server work but port 53 blocked in ...
30
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3answers
546 views

Windows TCP Window Scaling Hitting plateau too early

Scenario: We have a number of Windows clients regularly uploading large files (FTP/SVN/HTTP PUT/SCP) to Linux servers that are ~100-160ms away. We have 1Gbit/s synchronous bandwidth at the office and ...
1
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2answers
41 views

with fully permissive iptables, tcpdump shows icmp echo requests arriving, but no reply's are sent

I'm a bit stumped on where to look next. When using SoftEther IPsec VPN into my network, I can access every server in the main subnet but one. When behind the main firewall, the server responds to all ...
0
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0answers
20 views

Windows 2008 Cannot Ping/Connect to IP address that is pingable by other computers, Firewall disabled

Really weird issue that started out of the blue. I have one server and I'm trying to connect to another server, Server A. A single IP on the server is not reachable by my other server, Server B. ...
0
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1answer
28 views

Trunking cisco switch

We have a an ISP router located in one building and a firewall on a different building in my company. We want all internet traffic to pass through the firewall. The ISP router interface has an ip ...
1
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1answer
59 views

How to Configure Source NAT (Private IP => Public IP Outbound)

I'm running VMWare ESXi Free and have Zentyal SBS 3.2 running as a Gateway. I have 5 Public IPS (CIDR/29, let's call them 69.1.1.1 - 69.1.1.5) and currently Zentyal is bound to 69.1.1.1 as the ...
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0answers
21 views

Tool for Measuring UNC Path Access Times [migrated]

I'm being asked to write a tool that, given a UNC path and a set of credentials, will display the amount of time it took to access the directory. It then has to get any file in that directory, read ...
0
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1answer
32 views

Shares and printers on a server are not accessible for one workstation

The PC in question is running Windows 7 and the server is Windows Server 2012 Standard. Both machines can ping each other by IP and Name. I've tried flushing the DNS cache, removing the pc from the ...
0
votes
1answer
23 views

Very big connecting/waiting time for HTTP requests

We use server as a an aggregator with lots of small income HTTP requests (~1000 RPS). When we reached that number of RPS, http requests started to take randomly longer amount of time (100ms-4 ...
0
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0answers
15 views

Strange network issue when moving EC2 elastic IP

Recently we had an issue with a Windows 2012 EC2 server, which meant that we had to move across to another instance. We duplicated the instance, ran some tests and moved over the elastic IP. Should ...
1
vote
1answer
41 views

Intermittent switch failure and data flooding, hardware capacity?

We are using a switch (ZIO-SW500) connected to the building main network and we suffers from intermittent network halt. Normally the network works well. But, sometimes traffic designated to other ...
1
vote
2answers
37 views

Assign internal IP address based on subdomain

I have a domain name, let's say foo.com. I have a server which has a public IP (Server-A). I also have a lot of servers (Server-B, Server-C, Server-D etc) which are all connected in a private network ...
1
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2answers
43 views

Local DNS fails when another interface is connected

I have a LAN with a Linux server running BIND for addressing of local computers. When a workstation is connected to the local network (where there is no Internet access), I can successfully address ...
0
votes
0answers
16 views

How can I add a new physical interface to an Endian Community Firewall?

I just installed the Community Endian Firewall on my system. But it's just recognizing the first 4 interfaces (after going into shell and doing a ifconfig shows br0, br1, br2 and br3). How can I add ...
1
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2answers
29 views

Incoming tcp SYNs possibilities

This might be a general TCP question. Can I receive TCP SYN packet on an established connection OR a connection in TIME_WAIT state? Is is possible?
0
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0answers
27 views

Access VM from network

For my PHP-development I have VagrantBox running CentOS. This box however is only accesible from my own computer because it only has a NAT-interface and a Host-Only-network. But when I want to test it ...
1
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0answers
42 views

Redundant Debian Gateway

I have to configure a redundant gateway with Debian boxes and I would like to get some recommendation what's the best solution in my case. There are certain limitations in my setup and I have to go ...
0
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1answer
24 views

Route Redirect Issue

I have two routers in the same subnet: Linux server is a gateway to the Internet Juniper SRX100H is for connection with other offices through IPsec VPN All client machines have the Linux server as ...
1
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1answer
85 views

Trouble configuring standard VLANs on BNT G8264 and ESXi 5.5

I have a BNT (now an IBM) RackSwitch G8264 and am having problems trying to get standard VLANs configured and working with my two ESXi 5.5 hosts. I've followed the documentation (which can be found ...
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0answers
34 views

Network connection interrupted on workstation running windows server 2012 r2

So here's the scenario i'm facing: I'm running windows 2012 R2 with latest updates on non-server workstation (Intel(R) 7 Series/C216 Chipset Family SMBus Host Controller - 1E22), and following ...
0
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0answers
18 views

net view displays only my own computer

On Windows 7, I run net view. But only my own machine is displayed whereas I am supposed to see 8 others computers. However, the ping to those computers adrresses works fine. Why net view does not ...