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

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2answers
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Which Ports need to be accesable on a Domain Controller for Clients to logon?

We are currently segmenting our network. We will move the servers in another subnet than the clients. Of cause the clients still need access to the domain controller to authenticate against it. I ...
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1answer
7 views

How to forward specific packets from a machine to another machine? [on hold]

I have a network with 3 linux hosts, A, B, and C. I want to send 1,000 packets from A to B, and B should automatically forward it to C. How should I do it? B has one adapter with IP 192.168.1.100/24 ...
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0answers
6 views

How to run a function for every specific received packet? [on hold]

I am doing an experiment for my master thesis. I want to run a function (e.g. multiply two numbers) when a specific packet is received (e.g. a packet with destination TCP port 6666). For example, I ...
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3answers
1k views

ping and traceroute does not work when UFW deny outgoing by default

How to make ping and traceroute work after setting UFW with deny outgoing by default? Here is my UFW configuration: sudo ufw status verbose Status: active Logging: on (low) Default: deny (incoming), ...
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1answer
33 views
+50

No IPv6 connectivity from docker container

i'm having serious problems enabling IPv6 in docker. Environment The host is running Debian Jessie. It's a virtual Server (KVM). eth0 has a statically configured address like w:x:y:z::1 in a ...
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0answers
2 views

Linux Bridge (vmbr) has no connection to physical NIC [migrated]

I built myself a new home server and wanted to use Proxmox VE. Its Debian based and I have 3 KVM-machines running. Machine 1: "Sophos UTM" has WAN on vmbr0 and DMZ on vmbr1 (192.168.200.254) Machine 2:...
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0answers
11 views

Can't access network externally [on hold]

The network was working fine yesterday, but today I cannot access anything on the network outside the house. The browser still sees the server, but everything times out. Also the same case with ssh. I ...
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0answers
8 views

Output multiple VM's to only 4 IP addresses ESXI

I have set up a computer as an ESXI environment. The system has 1 physical network port. When I create network ports on my virtual machines, each gets an IP address assigned by my router. I need to ...
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0answers
15 views

Cannot ping one specfic website within my company network [on hold]

Within my company network I can browse and ping every external website besides my company website (e.g. example.com). If I try to browse example.com I receive an ERR_CONNECTION_TIMED_OUT. If I try to ...
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0answers
11 views

What are Gateway & Broadcast in Dedicated Server? [duplicate]

We recently purchased a dedicated server. When server details were delivered to us, we are given some more info along with the root login. Those are: xxx.xxx.xxx.24/30 - Network xxx.xxx.xxx.25 - ...
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1answer
1k views

vmware esxi host ha state in election

In my Vmware Esxi server 5.1 , 2 host machines which are added as cluster ,there HA state is turned to ELection .I tried Reconfiguring the vsphere for HA it is not working .In cluster it shows issue ...
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1answer
15 views

Linux port forwarding that automatically tries to establish a connection to the far side while keeping the originating side waiting

I've been playing around with port forwarding for web servers What I'm looking for is a way to forward the port in such a manner that even if the connection to the forwarded port is down for a moment,...
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1answer
16 views

What kind of emulator can i use to learn Cisco Router Configuration? [on hold]

I am going through my CCNA materials. I came across this one topic called configuring the router. Now, i don't have a Cisco Router but i still want to go through the commands and see the results live. ...
41
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11answers
37k views

What is the difference between UDP and TCP?

My router has two protocols (and a "both" option) that I can select when setting up port forwarding: UDP and TCP. What is the difference between these two protocols and when would you select one over ...
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1answer
1k views

For a switch using RSTP (or MSTP) on which port states/roles does it send BPDUs?

In trying to wrap my head around MSTP and RSTP I have read conflicting information about which ports a switch will send BPDUs through. It is clear to me that for MSTP the switch sends the BPDUs needed ...
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0answers
15 views

Windows server ignoring DNS resolution on private interface

I have a Windows 2012 server with two interfaces - public internet facing, and private. The private interface uses our internal DNS servers. This interface has no gateway. Static IP - not DHCP. I ...
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2answers
11k views

Lost connection to MySQL server at 'reading initial communication packet', system error: 0 with windows

I found similar questions but none of them helped me with a windows machine. I originally posted this on stack overflow but it was suggested that I ask here. I was able to connect to mySQL through my ...
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1answer
18 views

how do I measure the maximum network bandwidth? [on hold]

For the test client and the testbed, when there is no other traffic on the link between them, how do I measure the maximum bandwidth?
5
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6answers
7k views

Generate a limited amount of random network traffic between 2 hosts

I'm trying to find a utility that will allow me to generate a constant flow of random network traffic at a specified rate between 2 hosts. The utility needs to run on Windows and OSX. I've tried iperf ...
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0answers
4 views

Systemd Networkd [Match] Rule Multiple Matches

If I have a static network configuration like this: [Match] Driver=mlx4_en [Network] Address=10.1.0.10/24 Gateway=10.1.0.1 DNS=8.8.8.8 and say I have a dual port NIC which uses the driver mlx4_en ...
0
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2answers
32 views

How to setup failover with rabbitmq cluster with a loadbalancer like f5

I have been trying to find information on f5 developer central and internet regarding the following setup with no luck. We want to have a rabbitmq cluster with 3 nodes. 1 node will always be primary/...
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0answers
8 views

Decreasing boot time for Solaris 11.3

I'm trying to decrease boot times for Solaris 11.3. This is from a DL360 with 10K drives. Its the same machine that has the ACPI issues and lacks the BIOS updates. I'm seeing two issues I'd like to ...
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2answers
2k views

Unable to access different subnet

Router ip: 192.168.3.1 Windows server: 192.168.3.50 (WLan) and 192.168.2.1 (LAN) PCs: 192.168.2.x I am able to access 192.168.3.50 from laptop (in 3.x network) but unable to access through other ...
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0answers
10 views

Why does reading /proc/net/tcp take a long time ss is quick to return the same sort of data about the connections table? [migrated]

On Linux 2.6.32, if you read (for example, cat) /proc/net/tcp, on a very loaded system (for example, a web server), you will find that reading 100K entries takes over 30 seconds. That's a long time. ...
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0answers
11 views

How can I find the docker-machine network adapter name for a docker container?

I would like to introduce network variability into docker containers. Specifically, I would like to be able to run commands such as: sudo tc qdisc add dev vethecb732a root netem delay 500ms 400ms ...
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0answers
12 views

Keyboard and Monitor not getting detected on HP Proliant Server

I am having an HP Proliant Server running Windows 2008 Standard on it. Since one day we are not able to access it remotely. So I have checked the server I can see all the lights and fan is running ...
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6answers
7k views

Windows Server 2012 R2 performance for Mac OS X Clients (File Services)

I am inheriting a Windows 2012 R2 Server that is experiencing abysmal SMB/CIFS performance for Mac OS X Clients in particular. The server is doing file services and is an Active Directory Domain ...
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0answers
3 views

Monitor network traffic by FireQOS class?

I'm using FireQOS (which is basically an abstraction on top of the Linux tc qdisc mechanism as well as iptables) to classify traffic into different bandwidth classes. I can watch the bandwidth per ...
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2answers
1k 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 ...
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2answers
47 views

Linux block outgoing traffic to a specific ip without iptables

I basically need to run the following iptables -A OUTPUT -d 169.254.169.254 -j DROP except I cannot use iptables because the program is running in a docker container and I cannot use the --privileged ...
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0answers
5 views

Connecting two OpenVZ internal networks so containers can see each other

I have two OpenVZ Hosts with containers on them. This is the current layout: Host-A: (eth0 (connected to internet), eth1 (connected to Host-B)) Host-B: (eth0 (connected to internet), eth1 (connected ...
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4answers
12k views

iptables: IP alias and port forwarding

I can't figure out iptables and I don't know very much about networking and I'm really hoping that someone out there can help me. I have a server with two ip addresses associated with it: 1.1.1.1 and ...
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3answers
3k views

vSphere ESXi 5.5 Windows Guest Network card not active after reboot

Problem: Windows 2008 R2 or Windows 2012 servers have no network access after a reboot Not all VMs affected, but multiple VMs and mulitiple hosts. Windows Network configuration shows the correct ...
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0answers
30 views

Set firefox to use non default gateway

I have 2 internet connections. One is set as default, so all traffic goes through it. Other have no default routes added, so no traffic goes through this internet connection by default. boby@hon-...
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0answers
20 views

Client socket connection starts working only after being pinged by server?

I have a networked game I'm testing on a LAN. I'm using RakNet as my networking library. Generally everything works fine, but sometimes the client (an iPhone) seems to get "confused" when initiating ...
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1answer
1k views

Multiple interfaces: route packets to specific interface

I have 2 internet connections on my network. My router is running Debian. eth0 is my network (192.168.0.0/16). eth1 and eth2 are connected to 2 different internet providers (with dynamic IP). Here is ...
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1answer
49 views

Identify the ip to which an UDP port established connection

I'm trying to obtain the ip to which Rocketleague.exe has established connection on a UDP port. I've tried with netstat -p udp but for some strange reason it does not show any active udp connections . ...
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2answers
8k views

Windows Server 2012 Port Forward for Specifc Host

I am trying to have a specific host be redirected to another port when trying to access a service on port 80. So, when the client (192.168.1.22) requests a connection to the server (192.168.1.10) on ...
0
votes
2answers
67 views

Dual interface PC with one IP address

I would like to set up a machine with 2 network interfaces in the following setup: LAN1 <---> PC <---> LAN2 The tricky part is that the PC should be accessible from both LAN1 and LAN2 with the ...
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0answers
27 views

How to prevent disconnection / reconnection attempts on private LANs without internet connectivity?

I am developing an appliance system which is meant to be transportable, used monthly in a different location, for ~100 simultaneous users, with laptops and tablets. The system includes a server (http,...
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1answer
42 views

Probable network issue despite healthy ping stat?

We faced a problem with a windows network where we suspect it to be a network issue although the ping works fine. System Overview: The Windows network is accessed from multiple sites connected ...
2
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0answers
499 views

OpenVPN sndbuf and rcvbuf

I would like to know what is the difference between the sndbuf and rcvbuf buffer used by OpenVPN and net.core.w/rmem_default or net.ipv4.tcp_r/wmem. What does OpenVPN do when some value a provided ...
2
votes
1answer
3k views

How to force certain traffic through GRE tunnel?

Here's what I do. Server (public internet is 222.x.x.x): echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf sysctl -p iptunnel add gre1 mode gre local 222.x.x.x remote 115.x.x.x ttl 255 ...
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2answers
47 views

How to use 2 IPs on one Apache server

I have two IPs (and domains) on my dedicated Linux server (Debian). I'm able to access the primary domain. But when I try to access the 2nd one, I'm directed to the primary site. In /etc/network/...
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0answers
21 views

How do you ensure outgoing requests use the same IP in a Google Cloud server cluster?

I have a cluster of Compute machines on Google cloud that are load balanced for all incoming requests. These servers need to be able to make a request to an Enterprise partner of ours who requires IP ...
0
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0answers
24 views

Pinging (ICMP) Docker container on AWS ECS

I've got a script running in a Docker container that listens for ICMP packets. If you ping the container IP address, it picks them up and sends an email. However I'm having a bit of difficulty ...
2
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0answers
25 views

How to let chef listen on multiple IPs

I'm currently playing with chef to evaluate whether or not such a configuration tool might help us in our *nix-based environment. For the last few days I'm struggling with one problem I can't find a ...
0
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0answers
24 views

What is the purpose of both 802.11 authentication and association? [closed]

I mean this. Firstly I've connected to my iPhone to my D-Link router : iphone to D-link authentication, association, eapol handshake And then I've moved to another floor and was reasonably connected ...