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

learn more… | top users | synonyms (1)

0
votes
0answers
61 views

Access through jmx to java application into Docker container on remote host in local network

I can't connect through jmx (with VisualVM) to java application into Docker container on remote host in local network. Screenshot of the problem. Case 1: Java application into Docker container on ...
0
votes
1answer
17 views

Ubuntu 12.04 server cannot access anything outside

My Ubuntu 12.04 server was working fine a few days ago. But today I couldn't access anything outside. And i cannot ssh to my server neither. I am directly plugged into the console through my vps ...
-1
votes
0answers
24 views

Getting slow upload (to internal Win box) only from Win10

I have a user in the office who was on Win7 Pro. Since there's a Win10 upgrade going, I thought I would test/piolit it with her, so I loaded Win10 on a spare Lenovo box (MT-M 7052-A7U). Everything ...
0
votes
1answer
19 views

Issues with DMZ on Fortigate 90D, second router can't reach internet

I am having issues setting up a DMZ port on my Firewall (hardware router). I am also assuming this belongs in Super User, as it seems like a basic DMZ setup. Here is the setup: I have a Fortigate 90D ...
0
votes
1answer
28 views

Why is my host not receiving packets sent across tun0?

I have a tun0 interface set up which allows packets to be sent as such: HOST (aaaa::1) ----> tun0 ----> SLIP ----> Router (aaaa::200:0:0:1) The router receives the packets, and can send back a ...
2
votes
1answer
16 views

Ubuntu VMware (Windows Host) - Apache only routeable by LocalHost

I am a Windows based, python developer, who is currently working with configuring his first linux VM. I am able to get the VM set up, with internet access. I can apt-get with no issues. After ...
2
votes
0answers
55 views

Painfully slow network when routed through Windows 2012 R2

I have a Windows 2012 R2 server with two network adapters, on-board 1G one for the LAN and a 100M D-Link 530T connected to the internet. Internet Connection Sharing is set up on the latter. Client ...
0
votes
0answers
31 views

Safely restart network via ssh to set static ip

In my /etc/network/interfaces.d/eth0 I have set: auto eth0 iface eth0 inet static address 10.0.0.25 netmask 255.255.255.0 gateway 10.0.0.1 dns-nameservers 8.8.8.8 8.8.4.4 Which ...
1
vote
0answers
4 views

Bind OVSBridge to an already bound port

I want to enslave a NIC to OVSBridge which is already enslaved to a Bridge. Is that possible, if yes, how ?
0
votes
0answers
29 views

Running a router inside an OpenStack VM

I'm trying to make a router VM (actually an IPsec VPN server) inside OpenStack. The OpenStack is an installation of Mirantis 7 (why not newer? 8 from some reason causes kernel OOPS to the same image ...
-1
votes
0answers
26 views

Windows 2012 R2 VPN over WAN to domain best practice

I have a windows 2012 r2 server and it's connected to our domain over WAN via VPN. We are using a standard dial-up connection. All works fine however periodically the connection is dropped and we ...
2
votes
3answers
117 views

KVM-Host lost connection to Storage

I would really appreciate some advice on how to fix this. I have a Debian KVM-Host with 9 Debian VMS running on it. The virtual machines are running on my little Storage via iSCSI. Now, my switch ...
2
votes
2answers
97 views

pfSense on x64 hardware increased network performance?

Main server has 50x50 mbps dedicated fiber ISP. We currently have a Netgear FVS336Gv3 wired router with WAN to LAN throughput rating of 300 mbps. This device performs all routing to/from the internet ...
3
votes
0answers
58 views

How can I identify a rogue IPv6 DHCP server on my LAN?

This will be kind of a long post, but I want to give complete information. I have a home/business LAN with isc-dhcp-server running an ipv4 dhcp server and bind as a DNS server running on an ubuntu ...
18
votes
2answers
2k views

Why should I use an FQDN instead of the server's IP address?

In my work with servers I have come across in configuration files where you should enter the address to an external server. I have seen some use the server's IP address directly, but I have heard many ...
-1
votes
0answers
22 views

Using reverse proxy but Site not loading [closed]

I have two websites example.com example.net both sites have its own server example.com is found in x.x.x.1 example.net is found in x.x.x.2 both using port 80 I have only one static public ip and I ...
2
votes
0answers
21 views

“Bridge” host-only adapter and NAT adapter in a VM for other VMs?

I'm running Foreman locally in a VirtualBox machine with a NAT adapter and a host-only adapter. I'm running another virtual machine locally which is bound to the same host-only adapter. I can get the ...
0
votes
1answer
31 views

Router can connect to internet but clients intermittently can't get beyond the router [closed]

Currently working with a small business which is using an ISP supplied domestic ADSL modem/router to connect their internal setup to the internet and this is also being used for DHCP. They're having ...
-1
votes
0answers
12 views

Two host communication on same gateway [duplicate]

I can't ping or enter any opened port on host which ip is for example: 125.45.47.44 My ip is: 125.45.47.22 those IPs (public IPs) provided by our ISP Gateway is: 125.45.47.1 On this IP: 125.45.47.44 ...
0
votes
0answers
21 views

Sonicwall inter WAN interface communication

I have the TZ105 sonicwall and X0 is LAN and the rest 4 interfaces are 4 different ISP connections through 4 ISP routers respectively. Basically I cannot get any device connected to an ISP router to ...
0
votes
0answers
18 views

“Connection timeout” when accessing application server (CF8.0.1 on redhat) via LAN computer

I have a Coldfusion 8.0.1 server running on a Redhat server on my LAN. It's running on port 8500. I can access the Tomcat landing page if I remote into the server and navigate to http://localhost:8500....
0
votes
0answers
23 views

How to filter outgoing Ethernet packages by Ethertype?

I'm working with Ethernet Powerlink, which is a real-time protocol using standard Ethernet hardware, but forbids any interfering Ethernet communication. Now, when I connect my Linux laptop to the ...
0
votes
1answer
25 views

How to use another IP-address for outgoing traffic?

Background I run a server with two external IPv4 addresses. IP-address A (IP-A) and IP-address B (IP-B). Goal I would like to access IP-A over HTTPS port 443 and SSH port 22 only. IP-B shouldn't ...
0
votes
1answer
24 views

Vyatta Destination NAT not working

We are running into an issue adding new IPs to a vyatta device after exceeding the limit of IPs in our first VRRP group. All of the IPs listed in the vrrp-group 1 work fine but any I add to vrrp-...
0
votes
0answers
13 views

Which SNMP OID can I use for my software project? [duplicate]

I have a small Python script which is run by crontab. I want the script to tell me via snmp that it finished successfully. Are there any OIDs designated for situations like this (like the private ip-...
0
votes
1answer
30 views

Get network interface Nginx is receiving request on

I have a server with multiple network interfaces, and I want to write a proxy server, which would listen on all of these IPs. My config so far: server { listen 111.111.111.111:40000; ...
0
votes
0answers
22 views

Cannot login using SSH with password on Dell n2024 switch

I have configured SSH server on a Dell n2024 switch (firmware 6.3.0.9), but cannot login. The connection starts, but my ssh client waits indefinitely after trying key exchange, it does not continue ...
0
votes
1answer
64 views

Why should I use VPN in this scenario?

I have one web application, that is deployed on cloud. Now, this web application needs to access 3 Postgres databases, located in 3 different location(Lets call them, client systems). So one day, I ...
0
votes
0answers
27 views

Slow NIC Speed on 2 Dell Servers

I’m getting very slow NIC speed (both LAN & WAN) on two Dell R610 servers. I have multiple other R610's with same specs, connected to the same Cisco 3750 switch and they're fine. I've done a lot ...
0
votes
1answer
31 views

ARP spoofing on switch across subnets

Consider a switch without any VLAN's defined with 2 subnets configured. Is it possible to ARP spoof from one subnet to another? According to Evans reply in What are the implications of having two ...
0
votes
0answers
8 views

vmware windows 7 network driver not installed [migrated]

I´m using VMWare Workstation 12 Player to install a fresh copy of Windows 7 Professional x64 using my current key, so that I can later upgrade it to Windows 10. I´ve created a fresh VM and installed ...
1
vote
0answers
8 views

Rabbitmq listener across machine not detected

I have multiple rabbitmq listeners running across linux boxes. However when I post a message A (which takes some time to process , around 5 mins), new messages after A wait in the queue till A is ...
0
votes
0answers
32 views

Weird thing with Vagrant and DNS on my Ubuntu

On my local computer I have make a record on hosts file pointing to a specific IP address. The record is like the following: 199.199.199.147 my-local-domain.ext The above domain it is required ...
0
votes
1answer
29 views

Throttle incoming connections with iptables

I have a slightly self-inflicted DoS happening in some circumstances, and I'm trying to figure out if I can use iptables to help mitigate it. The short version is "How can I limit the rate of incoming ...
0
votes
1answer
58 views

How to use native ipv6 together with 6to4? I got lost packets

I've found that I can't run native IPV6 interface (at eth0) with 6to4 tunnel (at tun6to4) together. Here's my setup (/etc/network/interfaces/): auto eth0 auto bond0 iface eth0 inet static ...
2
votes
1answer
25 views

LAG on one managed switch

This may be a dumb question, but is there any benefit of using LAG on only one managed switch with 2 VLAN's? By default my switch, Netgear GS724T, assigns 8 LAG's to the default VLAN. I am using VLAN1 ...
1
vote
0answers
13 views

Propgation / Transmittion delay diagram [closed]

I have this following question to which I need help. I have this network diagram: I need to calculate the time it takes for a 1 KByte package to reach from S to D. I know the path is S->R1->R4->R5->...
4
votes
1answer
36 views

Using a 1G Ethernet Pass-Thru with BL460C G7 blade?

I've installed a new G7 BL460C into my HP BladeSystem C7000 enclosure. I have not had a G7 before. In the enclosure I have two 1GB Ethernet Pass-Thru interconnect modules (406740-B21). I am able to ...
11
votes
3answers
1k views

Effect of distance from server

I have a web server in Ireland (Amazon AWS). This server appears fast from Germany (orange line) but slow from the USA (black line). The HTTP request used for the test is the same. I think this is ...
0
votes
1answer
24 views

Two untagged VLANs on one port (ProCurve)

Goodmorning I'm setting up a new network. My problem is that i have a management VLAN 99 and an IT VLAN 89. Now i want to connect my laptop to one port and access both VLANs. Because when i'm at my ...
0
votes
0answers
10 views

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 ...
0
votes
1answer
24 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 ...
-1
votes
2answers
52 views

Unable to connect two PC's in a private Network [closed]

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 ...
0
votes
1answer
33 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 ...
-1
votes
0answers
47 views

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

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 ...
0
votes
0answers
28 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. ...
2
votes
1answer
148 views

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 ...
1
vote
2answers
62 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 ...
0
votes
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:...
-1
votes
1answer
42 views

Output multiple VM's to only 4 IP addresses ESXI [closed]

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 ...