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

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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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34 views

Can I get a speed increase?

Due to downsizing I am forced to take over other tasks. Am I missing an opportunity for a speed increase in the following set up? 24 devices ( dedicated devices with SD card storage ) with 100Mbps ...
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2answers
5k views

Network Tap (SPAN port) on FortiGate 100D (FortiOS 4.0MR3)

I'm dealing with a FortiGate 100D for the first time, and am scratching my head as there doesn't seem to be an easy way to mirror ports in the switch; which is really a facility that I presumed it ...
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20 views

Access Point Iptable/Route rule for allowing device discovery? Devices can connect manually, but not automatically. Multicast/Upnp issue?

I setup a wireless access point on my server and for some reason, everything works but automatic discovery features. I can't see any other devices, upnp devives aren't discovered, and I think it's a ...
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1answer
179 views

Huge performance penalty in gbit link with ip forwarding / masquerade through clear VPN tunnel

I have a problem with IP forwarding between my home computer and a remote server (from online.net). My home connection is a 1 Gbit/s FTTH and the remote server has a 2.5 Gbit/s bandwidth. The context ...
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3answers
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Layer 2 segmentation and network diameter

I am studying for my CCNA. The book makes a statement that I do not completely understand: "Layer 2 segmentation at the distribution layer practically eliminates network diameter as an issue." I'm ...
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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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149 views

ICMP replies - ingress or egress interface (e.g. from a traceroute)

When a traceroute is initiated and receives an ICMP reply from the nodes, which interface should the be replying be from according to RFC 1812. they are actually replying from ingress (where they ...
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2answers
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Are you able to save the running-config on Nexus Switches

I have been trolling Cisco sites and have not been able to find an answer to this questions. Are you able to perform a write mem or likewise to save these configs on Nexus 5000 switches?
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1answer
388 views

Catalyst to Nexus Migration - Can 4948s be used for access switches

We currently have a switching topology in which two 7600 make up the core and there are N many access layer 4948s at the top of every few racks. They are trunked to both 7600s. I would like to ...
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1answer
23 views

Internal network DNS can't be configed to route domain.com to www.domain.com?

We host a domain on the internet that is accessible outside of our internal network using domain.com or www.domain.com, but is our actual internal network domain as well, but the external website is ...
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1k views

How to enable TCP Vegas on Centos 5.4?

I'm trying to enable TCP Vegas congestion control on Centos 5.4 box. According to Vegas home page it is as simple as echo 1 > /proc/sys/net/ipv4/tcp_vegas_cong_avoid but this file does not exist. I ...
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7answers
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Setting the hostname: FQDN or short name?

I've noticed that the "preferred" method of setting the system hostname is fundamentally different between Red Hat/CentOS and Debian/Ubuntu systems. CentOS documentation and the RHEL deployment guide ...
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2answers
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How can I monitor network I/O usage per process under Linux?

Such known tools like iftop/iptraf display network I/O per interface and per connection. Is there a way to see network I/O statistics per process?
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8 views

Network issue in Compute node instance

We have two servers with Openstack Essex. Controller node a. nova-compute, nova-network, nova-volume, nova-consoleauth, nova-cert, nova-scheduler installed Compute node a. nova-compute and ...
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26 views

Strange activity on Wingate Proxy

I noticed some strange network activity on my network last night. I've never seen anything like it. It appeared as though public ip addresses were connnecting outward from my private network. It only ...
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31 views

“No route to host” when i do a telnet in azure

I have two VM's in azure with different public IP's and whose private IP's are : 10.10.1.9 10.10.1.6 When i do a telnet with following command from the server 10.10.1.6, i get the a error: telnet ...
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1answer
17 views

configure docker network bridge IP for multiple IP alias

I got a Ubuntu host with multiple IP address aliases and I want to expose the ports from docker containers connected to one docker network bridge to a specific IP address of the host and the ports ...
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66 views

Any tool for forking/teeing/sharing a TCP connection to the remote server? [on hold]

Could down voter please post your reason, as it's not obvious to me? Here's my problem. I'm building an automation program that talks to a remote server (think of it as a chat server or MUD game ...
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1answer
35 views

Renewing public dynamic IP via Powershell ?- Azure Resource Manager

i need your help! I'm trying to renew a dynamic IP assigned to a VM, but i want to figure it out if there's some possibility to accomplish this via powershell cmdlets without being in the need of ...
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12 views

VirtualBox natnetwork guest ip address WITHOUT guest additions installed

How can I get the dynamically DHCP-assigned IP address of a VirtualBox natnetwork guest WITHOUT guest additions installed?
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58 views

Multiple Gateways for Single Subnet

Right, this might be a long one, so bare with me... I have 2 machines, lets call them local1 and cloud1. local1 has 3 Nics: 2 connected directly to cable modems with public IPS (call them eth0 and ...
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19 views

Basic Vlan questions

I've been "awarded" with IT infrastructure manager possition as I'm the "good with computers" guy in my small office. Nedless to say they have made a huge mistake, I have no clue.... I'd like to ask ...
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3answers
87 views

Forward traffic between VLANs with iptables

We're having the following 4 VLANs on my network, connected to an Ubuntu Linux box with DHCP. This Linux should act as the L3 router as well. VLAN 10 on interface eth1.10 with subnet 10.10.10.0/24 ...
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21 views

Azure vpn is establish but causing delay or no traffic sometimes

We are trying to establish VPN Hillstone FW (device) with Azure. VPN details are: VPN type: Policy based Gateway Subnet: 192.168.50.10/29 default subnet: 192.168.50.0/29 VM inet Address: ...
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110 views

Web servers configured to use 'localhost' not accessible inside network

What would cause an Ubuntu Server 14.04 LTS machine to lose the ability to use 'localhost' in web-server configurations? If I replace 'localhost' with the machine's static, internal IP address ...
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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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70 views

IMAP Login: Server Certificate not installed. BUT IT IS! AFAICT

5/25/16 Continuing the struggle. We have done much wonderful work, and all the port 80/443 virtual hosts are singing and dancing. Life is good. But as for the poor port 143/993 IMAP email server, ...
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3answers
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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
28 views

CentOS 6.7 vm static external IP setup issue

I have a vm setup and have setup like my CentOS 5.5. It is a strange setup since we used Comcast Gateway as the router and I really don't want to change that since we're Mac and Apple routers only ...
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8 views

Firewall-Rules on Proxmox-Node cause VPS to be offline

I'm using proxmox to virtualize some small machines based on KVM. To do so I created the following network-config on the KVM-VPS: # This file describes the network interfaces available on your ...
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Viewing current network connections/traffic in real time, inside a datacenter/cloud [on hold]

Context I am starring blankly at my list of instances on Amazon. Hundreds and hundreds of computers in the wild, talking to each other. At least that's what I suppose. The truth is I don't really ...
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10 views

What is the default value for TCP accept queue length on Linux?

I have read this article but it doesn't mention where the default accept queue length can be found (it does mention tcp_max_syn_backlog though, but it's different). I'm working on a Java 8 project ...
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1answer
501 views

Machine with bonded interface does not receive multicast packets on all slave interfaces

After an upgrade of our machines from RHEL 6.6 to RHEL 6.7 we observed a problem where 4 of our 30 machines only receive multicast traffic on one of their two slave interfaces. It is unclear if the ...
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16 views

captive portal on a router for guest acess to WiFI

I'm setting up a WiFI network in a snmall boutique hotel using ubiquiti uap-ac-3 AP's and a managed ubiquiti tough switch. I would like to set up an internal webpage with captive portal so customers ...
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LDAP Server cant talk with network printer

Recently we replace network printer hardware fuji xerox with another model and we put same configuration as like before but in new print server having issues connecting with LDAP server user cant go ...
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How to start ubuntu server with wireless Internet connection? [on hold]

I have an Ubuntu Server 14.04 installed on my system. Whenever it boots up, it requires a wired connection from a router to complete the boot process. If the connection is not present, it waits for ...
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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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2answers
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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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1answer
3k views

Why does Server 2008 running SQL 2008 produce a FlushFileBuffer exception?

Hi I run 64bit SQL2k8 on 64bit WS2k8, and backup a database to a UNC file. The backup creates the file, copies the data, and when finishing, crashes. Backup database Infovest to disk = ...
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12 views

Route to Internet router from different subnet [on hold]

I ran into a situation where my network is setup like the following: my network In this image my Computer A is connected with WiFi DSL router which is connected to the Internet. Computer A and B are ...
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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 ...
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1answer
26 views

proFTPD unable to connect after update ECONNREFUSED

I am working on Debian 8 - ran a series of automated system updates and now I am unable to connect to my local server running proFTPD. I have made no changes to the client attempting to connect to ...
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19 views

Large payload - connection get's Hung with CLOSE_WAIT or LAST_ACK state

We have a webservice client which posts data to a 3rd party Webservice. We are having an issue when the payload is a bit large (Around 600KB) xml. Once we pay the process hangs forever. The Netstat ...
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25k views

How do I force Linux to reacquire a new IP address from the DHCP server?

The environment is Debian, although the answer will apply to all distributions.
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HP ProLiant BL460C Gen9 - NICs

Is there a way to get more than 4 physical NICs (4 active/4 standby) on an HP BL460c Gen9 server WITHOUT using mezzanine cards and extra VCMs? EDIT for more information: I have two c7000 enclosures. ...
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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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Win Server 2012: Keep Network mapped drive mapped at all times

I'm trying to get the backup working for valuable client data, I have a server that is hosting client data, and are using Microsoft OneDrive as a Mapped drive... But I think the task scheduler is ...
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3answers
1k views

Reach LXC container from a virtualbox guest on the same host

Context I develop websites on my Ubuntu laptop (Ubuntu 13.04 64b). Each site runs within a dedicated LXC container¹ on network 10.0.3.x I sometimes need to reach those sites from a virtualbox guest ...
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How can I connect a group of vms in Azure?

I have a number of Azure Linux VMs. I am able to ssh into all of them using the public azure connection info, however I am not able to ssh from one vm into another vm using the private info. I have ...