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

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How to use host internet which is using http_proxy?

I have a virtual machine which is connected to host with NAT and host only network. if my host is using open internet my guest(RHEL 7.1) can easily use host's internet. If my host is configured with ...
2
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1answer
1k views

Route outbound connections from local network through VPN

I have a server A running OpenVPN, an OpenVPN client B (a rooted Android phone as it happens) and a third party C (a laptop, tablet etc.) tethered to B. B can use the VPN to access the internet via A;...
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0answers
12 views

Digital phone system over fibre optic

I'm a bit of a novice in this area so please forgive me if this is a stupid question! I have some experience wiring up simple CAT5/6 networks and have also setup and run digital phone systems through ...
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1answer
2k views

Kernel: dst cache overflow

I'm under continuous floods at time that are generally of lower magnitudes. I've observed my system often to become totally unresponsive on its network while I observed this in the logs, kernel: [...
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1answer
16 views

how should I divide a network into several smaller vlans on a extreme switch?

I get a C-network from my ISP, and there's a static route in ISP side pointing to one ipaddress(192.168.0.2) in my C-network so that this C-net can be reached from outside world. I use a Extreme X460 ...
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1answer
53 views

How can I change the network adapter of a vm using a cli in esxi?

I want to change the network adapter of a guest virtual machine using esxcli, vcli or any other cli means. I couldn't find an esxcli command, which is expected as its scope is primarily the host. I ...
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0answers
65 views
+100

CentOS 7 connectivity issues

I have a second CentOS 7 box that's having a lot of trouble connecting. Basically, we were running WHMCS, but a domain lookup kept failing. So the issue is IPv6 connectivity. [root@da01 ~]# yum ...
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1answer
27 views

Unable to connect two PC's in a private Network

I have the following setting: VM1 (VMNET10 - private, without any other connection to the host system or the internet) VM2 (VMNET10 - same here ;)) Now i want to connect each other. I can ping ...
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3answers
3k views

Gateway gets stripped from DHCP Reply through OpenVPN tunnel

I have a bridged OpenVPN setup. This is my server config: port 1194 proto udp dev tap0 ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/server.crt key /etc/openvpn/...
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0answers
22 views

How to setup VM network such that they all have different public IP addresses

For example, in Azure or Digital Ocean or EC2, we have an option of creating unlimited number of virtual machines. How does each of these VMs come to have different public IP addresses. More ...
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2answers
48 views

Which Ports need to be accessible 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 course the clients still need access to the domain controller to authenticate against it. I ...
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1answer
34 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
20 views

Ubuntu LAMP server disconnects after some time

I am trying to move my websites from shared hosting to the vps I rented, so I am trying to set up LAMP stack. After installing all, the server works fine at start, when I visit it's IP address on ...
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1answer
387 views

Using my IPs on OVH server via GRE

I can't route my IPs into a OVH server, can you help me to find the problem? Mikrotik GRE IP: 192.168.55.10 OVH Server GRE IP: 192.168.55.20 GRE iface name: ali1_fr1-ovz1 IP to route from Mikrotik to ...
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2answers
3k views

No Ping/Telnet connection between VM

I am new in Azure and have one problem which I can not solve. I tried asking on StackOverflow, but - quoting - "You will have better luck asking on ServerFault". I want several Virtual Machines to ...
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4answers
7k views

How to see on Linux what network interface and source IP address is used for a route to a specific destination host?

If I have multiple network interfaces (here: 2) on a Linux machine (here: Debian Lenny). How do I see, over what network interface (NIC) a route to a specific destination host is going and what source ...
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0answers
9 views

Samba4 DC for VPN

I use an strato root server with Debian 8. Now I installed an l2tp/ipsec Vpn server, the interfaces name is ppp0. Now i want the new installed and provisioned samba4 DC to only be used over that ...
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1answer
19 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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1answer
2k views

Proxmox vps container connection problems

I have Proxmox on my node server which have ip:5.189.190.* and I created openvz container on an ip : 213.136.87.* and installed centos 6 on it The problem: Cann't connect to container ssh directly ...
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1answer
1k views

Find client IP connected to VLAN from Cisco Catalyst 3600 by SNMP

I would like to get using of course SNMP, list of client IPs connected to VLAN in Cisco Catalyst 3600. So far, I have pseudo-algorithm made by me which obtains those IP addresses, but I am not sure ...
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0answers
23 views

Windows Server 2012 and VM Ware Network, Host Cannot Ping Guest

I recently setup a home network so I can practice network administration at home to supplement my knowledge and improve my confidence in my programming career. I have been working out the kinks for ...
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2answers
43 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
51 views

Iptables firewall causing instability

I've made a script to set an iptables firewall,but it's Causing instability on the local network aplication . The firewall is droping the connection between the clients and the server for a while ...
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0answers
23 views

Can IPv6 connectivity between countries be unreliable?

I’m setting up IPv6 on my existing VPS and backup server. The VPS is located in Fremont on Linode, and the backup server is located in New Zealand. I have several VPSs within the Fremont data center. ...
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1answer
1k views

Is there a traceroute command for VXWorks? Specifically a Shoretel Phone?

I can't seem to find if there is a traceroute command for VXworks online or specifically with a Shoretel phone. Once I telnet into the phone, I would like the ability to see whether packets from my ...
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2answers
1k views

Traceroute doesn't reach gateway

i have problem with my opensuse 11.3 network. So, i've assigned ip 192.168.137.2 to it, and another computer (win7) with ip 192.168.137.1 On the opensuse, the gateway is the 192.168.137.1. and the ...
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0answers
11 views

2 networks and switching gateways in Asus routers based on source ip address [on hold]

I am sure this would be very common problem but I am unable to search correct forum where this has been solved. I have got limited knowledge of networking and need some one to advise me on my problem. ...
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1answer
3k views

“RTNETLINK answers: File exists” after upgrading to Debian 7

I upgraded my system from Debian 6 to Debian 7.3 yesterday. After rebooting, I chose the new kernel linux-image-3.2.0-4-amd64 and the network became unavailable. I tried sudo service networking ...
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1answer
15 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
15 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
49 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
12 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
17 views

Cannot ping one specfic website within my company network [closed]

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
14 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
17 views

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

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,...
-1
votes
1answer
21 views

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

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 ...
2
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0answers
29 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
19 views

how do I measure the maximum network bandwidth? [closed]

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?
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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
8 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 ...
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0answers
11 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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14 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 ...