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

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Interconnecting a fiber optic switch with a copper switch

What would be the best way to connect from a "fiber optic only" switch to a regular copper rj45 switch? Which of the configurations shown in the attached diagram would work properly? Should I go for a ...
0
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1answer
75 views

Linux ping network namespace

I added namespace to my host-machine and made it available by using this: ip netns add h1 ip link add veth01 type veth peer name veth1 ip link set dev veth1 netns h1 ifconfig veth01 10.0.0.1/24 up ip ...
0
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0answers
33 views

Network connection from old application to SQL Server 2008 R2 lost once in a while

We are trying to migrate an Axapta 2.5 database from SQL Server 2000 to 2008 R2. We are testing performance etc. on the new server, but once in a while, these two events are thrown on the Axapta ...
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2answers
66 views

Name Server with Multiple IPs

We have multiple internet connections attached to my company's network, from different providers, and there are authoritative name servers on the network as well, also with an IP from each of those ...
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3answers
3k views

Reloading NAT configuration on a running VMWare Server 2.0.2

I have a server running VMWare Server 2.0.2. The host is Debian Lenny. I have 15-20 virtual machines running, all attached to a single NAT network (named vmnet8). I have configured VMWare's NAT (the ...
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1answer
31 views

Users unable to log on to network

A strange problem came up over the last few days. Some of our users had an issue logging on to the domain network. I had thought perhaps it had something to do with a command that was run using a ...
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2answers
54 views

Would UDP over VPN eliminate packet loss?

I am receiving a MPTS UDP stream from a remote location and I am experiencing packet loss. I would like to know if there's any way to eliminate this packet loss while still using the UDP protocol? I ...
0
votes
1answer
258 views

Adding static IPs on a p1p1 interface in ubuntu 14.04

I'm wondering if anyone can give me a rundown for networking configurations in ubuntu when the interfaces are p1p1 etc. I have tried p1p1:0 (like eth0:0) for secondary IPs to no avail. If someone ...
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6answers
10k views

CIDR for Dummies

I understand what CIDR is, and what it is used for, but I still can't figure out how to calculate it in my head. Can someone give a "for dummies" type explanation with examples?
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2answers
96 views

/etc/sysconfig/network is ignored on CENTOS7

I have a server with two NIC's. The default gateway has to be on a specific one, therefore I configured the GW via /etc/sysconfig/network. But obviousely, this is completely ignored by the ...
-3
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1answer
49 views

Where to optain my client key for SSL decryption? [closed]

example.pcap is a traffic capture I have made on my local Linux box of and now I would like to decrypt it. tshark -o "ssl.desegment_ssl_records: TRUE" -o "ssl.desegment_ssl_application_data: ...
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1answer
2k views

Diagnosing packet loss / high latency in Ubuntu

We have a Linux box (Ubuntu 12.04) running Nginx (1.5.2), which acts as a reverse proxy/load balancer to some Tornado and Apache hosts. The upstream servers are physically and logically close (same ...
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2answers
1k views

Docker containers can't resolve DNS on Ubuntu 14.04 Desktop Host

I'm running into a problem with my Docker containers on Ubuntu 14.04 LTS. Docker worked fine for two days, and then suddenly I lost all network connectivity inside my containers. The error output ...
0
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0answers
36 views

packet is not being forwarded from tap interface to bridge

I am running fedora 19 on a virtual machine and have two tap interfaces (A, B) created. I'd like to be able to send packet from A to B. I am trying to do this using a bridge, however with the bridge ...
0
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0answers
14 views

Persistent promiscuous bridge interface

In an effort to try and clean up the office network I've mirrored the uplink port on our switch, plugged it into a spare port on our VM server, and set up an VM with ntop. All this works, however we ...
2
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2answers
437 views

Multiple Gateway improve performance

I have a proxy Server and a PBX server that both have their own router as a gateway. Nevertheless, the company acquired an additional more stable ISP and now I have three Internet connections. Is ...
2
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3answers
2k views

Can I add a second network adapter to my Azure VM?

I have Multiple VM's on Windows Azure. Default, they come with 1 network adapter and you can only assign 1 virtual network (Availability Set) My question is : possible to connect 1 VM to more then 1 ...
0
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1answer
24 views

ipaddress swap causes both machines to be unreachable

I got two virtual machines running on SLES11 SP3 in the same subnet for which I' d like to swap ip-addresses on the fly. I tried the following script (of course with both different ip parameters) on ...
24
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7answers
18k views

What is the minimum ethernet cable length for a CAT6 gigabit connection?

We run a Netgear GS724Tv3 switch and part of the configuration per port is an option for "Lower Power Mode". The documentation for the switch lists this feature as a "Green Ethernet Configuration" ...
5
votes
2answers
410 views

Running docker in VPC and accessing container from another VPC machine

I'm having issues while running docker in AWS VPC. Here is my setup: I've got two machines running in VPC: 10.0.100.150 10.0.100.151 both having an elastic IPs assigned to them, both running in ...
2
votes
1answer
3k views

Configuring https access on HP A5120 Switch

I am trying to configure HTTPS management on a HP a5120 switch running Version 5.20.99, Release 2215 and not having much luck. I have followed the manual by creating an SSL policy first and then ...
1
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0answers
31 views

Xen VM could not be installed

I have rented a server from Hetzner. I have installed Xen on Dom 0 - Centos 6.5. I couldn't create a Dom1 Centos 6.5 VM. The Error I see is 'Unable to retrieve 'the link for centos image' while ...
0
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1answer
41 views

How many times does switch calculates FCS?

Does a switch calculate the Frame check sequence (FCS) before sending packets? Because packet shouldn't change, so FCS should also stay the same.
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0answers
17 views

Configure Proxy Server

Here is what I want to do: I have a Java application that supports execution of any HTTP/HTTPS URL with or without proxy server. I could able to do it with HTTP and HTTPS. But I am getting stuck ...
0
votes
1answer
36 views

How do I tell a headless Ubuntu 14.04 server how to access a shared drive that is on Windows domain and renew password for a Windows user?

Inside a corporate situation, the machines are largely controlled using Microsoft technology. I have another server on the same network that is running Ubuntu 14.04 headless. No GUI. I want to write ...
2
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1answer
48 views

Simplex, half-duplex, full-duplex (ccent1)

If simplex, half and full duplex are OSI layer 5 (session layer) modes, why are they configurable on a l2 switch?
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0answers
25 views

Benchmark network (internet) connection on server

I have a dedicated ubuntu server I rentet. Now I'm running a lot of ruby background processing on that server, that - among other things - does a lot of get requests to very small images (about 10kb) ...
2
votes
5answers
4k views

Unable to browse Server 2008R2 from XP clinets

We have just deployed a Windows 2008R2 server in our Windows 2003 domain. XP clinets are unable to browse in "entire network" and find the new server. It can be accessed by entering \\servername and ...
2
votes
3answers
5k views

How to configure a network to block gmail but allow google apps mail?

Google app mail loads via http://mail.google.com/a/[domain] and gmail loads via http://mail.google.com/mail. How can I block computers on my LAN from accessing gmail urls but at the same time permit ...
1
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1answer
94 views

CentOS with multiple NIC and static route

I am trying to setup a CentOS with 3 NIC and static routes. eth0 has IP address 192.168.10.2 and GW:192.168.10.1, eth1 has IP address 192.168.20.2 and GW:192.168.20.1, eth2 has IP address ...
0
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0answers
55 views

TCP ignores some packets for no reason

I have a weird problem which I can't understand. The actual network configuration is quite complex, because I am using Openstack and Docker to build a virtual network. However, the problem is not ...
4
votes
3answers
394 views

identify physical network device by interface name in linux

I have multiple USB to ethernet devices which are plugged to the same pc. Is there a way to identify which one is mapped to which eth* network interface via usb port/etc ? I have tried looking in ...
3
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2answers
8k views

Disable TCP-Offloading {completely, generically and easily}

I want to disable tcp-offloading ("TOE") on my debian servers. ethtool -K ..... I have some wishes, though: Integrate it cleanly into debian This reads: no rc.local, I would also like to avoid ...
0
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1answer
54 views

Monitoring “external” worm activity remotely

Some of our computers in our company has been infected with the worm Conficker. We don't know the source of the infection, but I want to monitoring the outside activity to see if we are still infected ...
3
votes
0answers
91 views

TCP connection stuck in SYN_RECV state despite ACK received

My client and server are both internal machines. tcpdump on both client and server show all three parts of handshake are communicated, however netstat on server shows SYN_RECV, and on client shows ...
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1answer
22 views

Access 2 Hosts from Internet on same subnet [closed]

Hi I have 2 raspberry PI in my network. And I want both of them accessibles from the internet. Right now I have a DMZ from you can access one with NO-IP setup: www.blabla.no-ip.org ----->DMZ ...
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2answers
82 views

How to check current TCP Congestion Window on Linux?

Does anyone know how to check the current value of initcwnd? (particularly on Debian [Squeeze]) I've searched, but can't find a definitive answer to this. I haven't changed it, but may want to ...
32
votes
1answer
903 views

Random TCP RST's on certain websites, what's going on?

Short version: One Windows Server 2012 machine on my network is getting persistent but intermittent TCP RSTs when connecting to certain websites. Dunno where they're coming from. Check out the ...
9
votes
4answers
3k views

Methodologies for performance-testing a WAN link

We have a pair of new diversely-routed 1Gbps Ethernet links between locations about 200 miles apart. The 'client' is a new reasonably-powerful machine (HP DL380 G6, dual E56xx Xeons, 48GB DDR3, R1 ...
0
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0answers
33 views

Automatically configure networking on new VM in XenServer

We have a base RHEL 6.5 64-bit template that we use to create new VMs in XenServer. Every time we make one, we have to configure: /etc/hosts /etc/sysconfig/network ...
7
votes
1answer
6k views

Connect to multiple AP with one Wifi adapter under Linux/FreeBSD?

How can I connect to more than one Wifi access point simultaneously using a single wireless adapter? I'm currently using pfSense as my home router and I want it to connect to multiple APs wirelessly. ...
0
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2answers
95 views

Recommended TCP keepalive settings for a busy server

We are having some network timeout issues on a Debian server that is quite busy, and maintains multiple connections to a number of other servers on the network. Here are our current TCP keepalive ...
9
votes
5answers
12k views

Disable Windows Server Network Locations

I'm not sure what exactly this feature is called. But in Windows Server 2008, it has the Vista Public/Private/Domain locations. This makes sense for laptops, and none at all for servers. My problem ...
5
votes
3answers
330 views

Multiple ethernet interfaces

I have a two network cards, configured like this: eth0 Link encap:Ethernet HWaddr 00:19:d1:31:08:e8 inet addr:192.168.5.104 Bcast:192.168.5.255 Mask:255.255.255.0 inet6 ...
0
votes
1answer
70 views

2x uplinks in HSRP - how to setup switch?

Our ISP provides us with 2x 10G uplinks, and they use HSRP on their end. We see incoming traffic (load balanced) on both ports, but outgoing from us is only via one port. We only run L2 on our side ...
4
votes
1answer
131 views

Batch configure HP ILO from laptop

I need a method of setting over a thousand Ilo's on our HP DL360p Gen 8 servers (With hundreds more on the way!) Our environment doesn't allow for the use of any automatically assigned address such ...
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votes
2answers
50 views

TCP/UDP Small Package Size optimization [closed]

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 ...
4
votes
2answers
2k views

Best file sharing protocol for Windows clients?

I want to share files on a Linux server with Windows 7 clients. I have a choice between multiple file sharing protocols: SMB/CIFS, FTP, WebDAV, NFS… question is: which one is the best for my needs? ...
3
votes
2answers
371 views

Small office WiFi network with Airport Extreme (15 people) advice

Hi I am having some problems with creating a decent office wifi setup. This is the current setup: Users via Wifi x15 > Router wired into > Airport Extreme wired into > Phoneline So our 15 ...
0
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1answer
141 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 ...