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

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Disable eth0 on boot, but allow to turn back on

We are setting up an offline/offsite backup server. The purpose is to have it offline and uncontactable from anything. Then, once the cron starts the backup process it will enable the network, backup ...
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4answers
2k views

Ubuntu Server 10.04 Heavy Network Traffic causes disconnect

I'm currently running a headless Ubuntu 10.04 server. Installed is the LAMP stack, Joomla, Virtualbox, phpvirtualbox, webmin and proFTP.. It resolves the IP address so I can access it remotely (either ...
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34 views

Routed bridge networking for KVM guests along with eth1 alias interfaces for shared hosting with dedicated IPs for each virtualhost

First question here on serverfault, so kind of a newbie, all feedback is welcome. I have a dedicated server running Debian GNU/Linux 8.4 (jessie) with one public IP and multiple additional public IPs ...
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22 views

Forward port 80 to 8080 for a specific IP on the network

I have a specific PC on my network running a web service on port 8080. I also have a different machine which acts as a gateway/router, which I configure using iptables rules. What I want to do is ...
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1answer
2k views

IP Conflicts from mikrotik router for multiple ip addresses (that it isnt assigned)

I have a point to point wireless connection using two mikrotiks. When I plug the mikrotik into a switch with just my laptop I get an IP address conflict on my machine no matter what IP I am assigned. ...
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1k 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
42 views

fast ping response, latency on traceroute

I have a very strange problem. In short pings to my wireless AP are low (around 1ms), however, once I do a traceroute, the latency to the AP (1st hop) suddenly jumps to ~1000ms. Any ideas what may be ...
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29 views

Figuring out the most efficient use of an ip range

I am working with Packet Tracer atm and have 3 subnet plans : assigned(management(104users) staff(43 users) admin(35 users)). I have an ip address range of:38.191.0.0 and subnet mask of ...
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31 views

Extreme Switch QinQ

Trying to configure QinQ solution between two extreme switches facing an issue: | Error: 8: Port cannot belong to VLAN and a VMAN at the same time.| This port is not configured in any VLAN or VMAN ...
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23k views

Why do ICMP Redirect Host happen?

I'm setting up a Debian box as a router for 4 subnets. For that I have defined 4 virtual interfaces on the NIC where the LAN is connected (eth1). eth1 Link encap:Ethernet HWaddr ...
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2answers
69 views

How to calculator IP range and subnets?

I am trying to find exact formula for finding the IP ranges for the below sample input 10.144.26.192/28 I am getting different IP count in different portals. I used the below online IP range ...
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3answers
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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 ...
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88 views

Why is fragmentation done on layer 3 (Network layer)?

Why is fragmentation done on network layer and why not on other layers ? Fragmentation means splitting the packet into to small pieces and sent from source to destination. The maximum MTU size is ...
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1answer
18 views

routing laptop to give raspberry pi internet access [on hold]

I connected my raspberry pi to my laptop (Windows 10) through direct ethernet connection. Pi is 192.168.1.250 and laptop ethernet is set to 192.168.1.180. I will have internet connection through wifi ...
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4answers
11k views

Default gateway is in different subnet. How to configure in RHEL6.2

I have two subnets routed to my server from ISP. I have only one gateway ip. The gateway is on the same VLAN as my IP address. For example netowrk 1 is 1.0.0.0/24 and network 2 is 2.0.0.0/24. Both are ...
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9answers
10k views

slow unc resolution on a win 2008 share

I've got some neworking issues with my sbs 2008 server. Basically if i try and access the server's shares via a unc path it takes a long time to resolve, but a mapped drive is quick (until i try to ...
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2answers
6k views

How do I get a network interface up in rhel 7?

I was given a rhel7 vmware template to use for provisioning rhel 7 test environments. When I created my vm, it booted up fine except that my network interface doesn't seem to come up. If I type ...
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2answers
22 views

Graph zabbix and time navigator have different time periods

why the time zone is different between the server zabbix ubuntu and console of zabbix ? the server time zone is ok (utc) but not right in the console(browser) l tried the command dpk-reconfigure ...
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2answers
78 views
+50

Collectd --> Elasticsearch if remote-host can't connect to central elasticsearch

Goal Central storage and way to analyze performance numbers: cpu load ram usage ... Current strategy I would like to implement a setup like this: collectd logstash elasticsearch kibana Like ...
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7 views

Vagrant Public Network, IP, Using .dev [migrated]

My end goal is this: Create a public networked Vagrant box with Computer1 that is accessible via LAN/Wi-Fi with a local domain like example.dev. First off, I have read this question on Vagrant Public ...
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1answer
27 views

Same script, same OS, same installation, failing

So I'm working with RANCID to monitor some switches and I'm using clogin now to test some modifications. I'm working in two different computers but both of them from the office. Althought they are ...
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1answer
39 views

ISP “hide” packet trace route

Yesterday , i've discovered changes in my network , our ISP hides trace route . ie : traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets 1 192.168.88.1 (192.168.55.1) 0.256 ms 0.251 ...
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1answer
71 views

VMWare vSphere packet loss

I have a Dell Blade Enclosure with 14 blades and ESXi 5.5 on it. On blade 7 and 14 I have round about 65 % packet loss when I ping the ESXi Management interface. On all other blades there ist no ...
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0answers
16 views

Will this setup cause a Bottleneck Connection / Speed issues? [migrated]

I'll have one cat6 cable running from my router to a switch. That switch will then give internet and network access to 5+ devices. Will this cause a bottleneck / anything negative if all devices are ...
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1answer
14 views

net use - error code 1219

I am trying to understand what causes the error code 1219 (multiple connections to server by same user). The background of my question, we are currently installing a machine at a customer, where our ...
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1answer
41 views

Point of Sale Terminal Crashing the Network

We look after a series of restaurants which is a collection of point of sale terminals and a typically a single workstation per site. We have one site that is causing a fair amount of head ache and ...
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2answers
47 views

Win 2012 server will not resolve domains using web browser, PING or NSLOOKUP, yet services on server are working

This is a windows 2012 server running SQL 2014. The server does not seem to be able to resolve IP address when given a domain name. The problem first showed itself when I tried to go to a web page ...
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22 views

debugging “eth interface using wrong IP” on server

My Uni provided me two hostnames and static IPs for two interfaces on my Fedora Server 23. My idea is to use one hostname for production and another for dev branches. It should work as: bio-db.uni.edu ...
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2answers
29 views

Tool for diagnosis/proof of network connectivity issues

I am in a shared workspace and am trying to communicate the issues I am having with the internet performance to the workspace provider. The main issue I have other than slowness is momentary ...
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0answers
13 views

Cannot connect to network from inside Virtualbox (Windows Host, Gentoo Guest) [on hold]

I recently got my computer upgraded from windows 8 to 10, and since then, I've been having trouble getting the internet to work. I was hoping that someone could give me some advice on how to debug ...
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32 views

Hyper-V vm can ping host but host cannot ping Hyper-V vm?

When ping host from hyper-v VM, it works both with ipv4 or ipv6. Pinging MyHost [fe80::3549:ee49:a75c:619c%9] with 32 bytes of data: Reply from fe80::3549:ee49:a75c:619c%9: time<1ms Reply from ...
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2answers
34 views

how to release shared files' locks from other systems before server downtime - with Powershell?

Is there a way to use Powershell to clean up/release file locks on a server when it's time to upgrade? we have other systems connecting to the server's shared resources over the network and some files ...
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22 views

How Dns Server keep tracks [on hold]

I was quite eager to understand, how does DNS server work. Scenario If i do a DNS query, it reaches to local DNS server, Now Local DNS server checks locally,if information is not present,it queries ...
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1answer
47 views

Debian : SSH port attack continues, cannot change port coz of provider, suggestions?

We have a debian server, which is running our Tomcat hosted applications and we have installed Fail2Ban on it. Everyday morning I see that a lot of people on the internet try to attack the server. ...
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10 views

OSX Network: Incoming traffic interface and outgoing traffic interface are not the same [on hold]

I'm on OSX El Capitan / Yosemite, and I've a strange behavior. I have the ethernet and Wifi interface enabled. The network interface order is set to WiFi then Ethernet, due to some proxy limitation ...
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1answer
33 views

How to optimize throughput on a linux NAT/router?

I am trying to use an old Fujitsi RX300S2, with a quad core Intel Xeon CPU @2.80GHz as a Gitabit NAT router, it has a dual gigabit NIC on board over PCI-X. The router will also forward multicast ...
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0answers
7 views

Handling time based events within a cluster [on hold]

I have a Java app which loads up records from a database and then executes something every x mins/seconds, in a one machine environment, this works fine, however if this was to be run in a cluster, I ...
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2answers
49 views

Is it really that easy to move this network?

I am just wondering if maybe I am over simplifying things here. I have a network housed in one data center in Seattle. We will be moving out of that data center this weekend. For the sake of keeping ...
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2answers
39 views

VPN Connectivity

My office has VPN connectivity with client network which allows us to access internal applications at client side. My company is setting up another office in different location for which we need ...
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0answers
20 views

dhcpd.conf options for different subnets when layer 3 switch is doing the routing

We have a flat networks in our offices and I have been tasked with creating new vlans to compartmentalize traffic. Our current network is 10..0.0 (default vlan on our switch) with a CIDR of /24, ...
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0answers
10 views

foreman, DHCP smart proxy, network set-up

How would I go about setting foreman up so it hands out a lease to any machine I connect to one of its interfaces using a private IP in the 192.168-range during provisioning, but to supply the client ...
0
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1answer
89 views

no network in nspawn container

I'm having an issue with networking in a systemd nspawn container. I have enabled the -n / --network-veth option in the systemd-nspawn command. This has worked a few hours ago (I know that because I ...
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0answers
18 views

Amazon EC2 openVPN instance connection issues

Currently trying to connect to an openVPN server set up on an EC2 instance that is also running a web application. My client establishes a connection with the server and I can ping the gateway ...
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0answers
8 views

IPsec tunnel, receiving data with wrong destination address

I've managed to stablish an IPsec tunnel using strongswan to a Cisco router. My server is an Azure VM, so it is behind NAT. I do not have control over the Cisco router. This is my /etc/ipsec.conf: ...
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1answer
1k 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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22 views

create a PPTP VPN server to act same as PureVPN PPTP server?

I'm new in networking. Our ISPs are providing us with private IP addresses so port forwarding is not possible, They are offering fixed IP addresses but with extremely high price so the only option is ...
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1answer
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How to redirect traffic through IPv6 IPSec (strongswan) gateway?

I'm trying to set up IPSec secured connection to the gateway. Have three hosts: A: eth1 - fec0:1::1/64 B: eth1 - fec0:1::2/64 eth2 - fec0:2::2/64 which is gateway between A and C; forwarding is set ...
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0answers
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What is wrong with my IKEv2 configuration, and how can I fix it?

I've attempted to set up an IKEv2 VPN on my DigitalOcean server following this guide. So far, I get a connection, but I can't seem to send any data through it at all. I'm not sure what's going on or ...
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A DIFFICULT CONFIGURATION OF 2 NICs

I have 2 network card: elan01: The work network with proxy, I use this for all the system and for the internet. I want to use this for almost every page. wlan01. I connect this direct to a ISP, but ...
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4answers
18k views

Accessing LAN resources from WLAN using SonicWALL TZ 215 wireless-N

I'm trying to allow clients connected to my SonicWALL's wireless network to connect to computers on the wired LAN. I am aware that this is a security risk. I set up the firewall to allow the ...