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 prevent linux from dropping incoming packets that have a wrong mac address (promiscuous doesn't work)

I configured three machines in a static proxy_arp like manner: ----------------------+ +-----------------------------------------------+ +---------------------- Machine A | | ...
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1answer
36 views

Consolidate multiple physical network drops to a single server (multiple servers, but each needs to go to all)

I am not a network guy, but rather a general IT guru that knows just a small bit about networking in general (enough to get myself in trouble!). My business has been growing over the last several ...
0
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1answer
49 views

Hyper-V VM moving went wrong

I had a little project to move our DHCP server from an old host to a new one. It looked dead simple.. but after I moved it manually ( copying vhd to new host and then configuring VM there) the Guest ...
24
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2answers
2k views

Why is IPv6 adoption higher at weekends?

Look at the graph of IPv6 adoption rates maintained by Google here: https://www.google.com/intl/en/ipv6/statistics.html Zoom in to the September to December 2015 period. The graph of IPv6 adoption ...
1
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1answer
54 views

IPv6 resolving as loopback/private IP

I'm running a web crawler and I received some reports from my datacenter about connections directing to private IPs (like 10.0.0.1). I've implemented a loopback/private ip check to my crawler code and ...
3
votes
1answer
58 views

Can't Ping other local ips on l2tp vpn connection, getting: ping: sendmsg: No such device

I have setup an l2tp client using xl2tp to connect to an l2tp vpn server. The server connection requires that the connection be setup WITHOUT ipsec. So I have set up a basic xl2tp connection. The ...
3
votes
1answer
54 views

Cannot bind to a specific IPv4 address when making outbound TCP connections, to hostnames that resolve to both IPv4 and IPv6 addresses

I just spent about 6 hours trying to figure this out, and I now believe CentOS/Linux is unable to bind to a specific virtual IPv4 address when connecting to a hostname that has an IPv6 address. This ...
1
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1answer
30 views

Can't reach server connected to another network card in the main server [closed]

i have a problem here and i hope you can help me solve it. I have one server (MainServer) with 2 network cards creating two individual networks. Network 1: Internal network with IP 192.10.1... and ...
1
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1answer
36 views

Opensuse port forwarding 80 to 8080 not working

I've a glassfish server that use the port 8080. I need forward from port 80 to 8080 so I can access the content without put the :8080 port in the url. I've tried to put a masquerade rule, add ...
2
votes
3answers
65 views

Check the cause of slow loading time among different server

A e-shop has developed using perstashop and put to the three server: the first 2 are amazon EC2, should be same setting Server 1: http://be-pure.com/en/women/3-slim-y-tank.html Server 2: ...
0
votes
2answers
32 views

can't connect to tomcat/telnet to a remote host

I want to connect to a tomcat installed on a VM which is running on my laptop however I am not able to connect to it. I stopped the IPTables to ensure that this is not a firewall issue. I can ping ...
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0answers
86 views

How to send answer packets to initial NIC in Windows 2008?

There are two hosts. Both has two NICs. [host1] -- lan -- [host2] | | internet internet host1 - Win Server 2008 host2 - Linux Debian How to route tcp connections to ...
3
votes
1answer
39 views

apt-get update hangs on fresh install of ubuntu 14.04.3 in virtual box

OK, it has been a while since I have configured a virtual box from scratch. Fresh install of ubuntu 14.0.4.3 lts no proxy or anything fancy the network adapter is set to bridged after the os ...
3
votes
2answers
742 views

TCP Messages Merged?

I have an application that sends 100 of 186-byte (excluding headers) TCP messages back to back without gap from host A to host B. I ran tcpdump to capture the packets on host A (where the sender is), ...
-2
votes
1answer
21 views

How to config apache for a local network app?

Hey guys I'm really new to this please forgive me if I butcher all the terminology. I've managed to get a lamp-server running for my small business and have created a small webapp that runs on the ...
1
vote
1answer
63 views

Can't ping from guest CentOS 7 VM to another guest CentOS 7 VM

I have a problem with ping VM from and to another VM that run CentOS7. The hypervisor is KVM and I control all with CloudStack. The strange thing is that I can ping from and to secondary storage vm ...
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0answers
38 views

iptables user-defined chain not working

I am testing rate limiting to outbound IP's using iptables with user defined chains. So far I have only been able to get this to work with inbound traffic to my server. I cant seem to rate limit ...
4
votes
1answer
43 views

What happens to active TCP sessions when the active slave fails in a Linux bond (failove or LACP)?

Given an active-backup (mode 3) or 802.3ad (mode 4) type bond, when the active slave fails, is there any seamless failover for those TCP/IP connections that were active prior to and at the time of the ...
3
votes
1answer
37 views

Cisco ASA 5505 L2L vpn issue

this is my setup I already have a working L2L VPN between the sites I added the 10.10.0.0/24 to the object-groups that defines the internal network on the 1615 ASA And as a remote subnet on the ...
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vote
3answers
72 views

Dividing ISP access for all computers in LAN [closed]

My family had bought an old internet cafe with 18 computers connected to four(4) internet service provider (ISP) 3 routers and 1 modem, one 16 port desktop switch and 8 port ethernet switch to create ...
0
votes
1answer
100 views

How to set 1Mb speed per host in pfsense

Currently we are using pfsense latest version and I want to assign download speed upto 1Mbps per host and also setup squid proxy and working on bridgh mode in pfsense box.
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2answers
185 views

Find out physical network layout?

I'm dealing with some weird networking issues at a workstation in a large warehouse. There is a preexisting drop that is being used for a machine. I found the other end of the wire by using a tone ...
1
vote
1answer
118 views

Wrong hardware time on linux

I don't have the correct hardware time on my debian server: root@server[09:48]:date Tue Dec 22 09:48:52 EST 2015 root@server[09:48]:date -u Tue Dec 22 14:48:54 UTC 2015 root@server[09:48]:cat ...
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0answers
11 views

How to provide connectivity to a bridge running in a different network namespace?

I have a bridge running in a different network namespace. I want to access this bridge in host system. For e.g: I have created a network namepsace: my_namespace. Now inside this network namepsace i ...
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0answers
12 views

Transparently (reverse-)Proxying/Tunneling Traffic in both Directions through (semi-trusted) Remote Host

Following set-up is given: Some client <---internet---> P <---internet---> Server (with dynamic IP addr) The aim is to tunnel all traffic to specific ports (all email-related ports in this ...
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0answers
20 views

Is there a way to get the KVM Guest using alias interfaces to communicate with one another?

I've done lots of reading and it seems I have misconfigured my KVM Server. I would mess with the networking to get it to work but everytime I have, my company had to send somebody over while I try to ...
5
votes
3answers
161 views

10G issues centos6.7 juniper ex4500

I've been scratching my head over this for the past 1 week and can't seem to find any solution. So, this my problem... I have a Juniper ex4500 10g switch connected to my servers over sfp+ twinax ...
0
votes
1answer
31 views

how to cap server bandwidth to each client in a network?

I have a pc with windows server 2008 r2 and 100 mbps network bandwidth when a another PC connect to server pc and start copying files from server i want the server to cap bandwidth to this pc to 2 ...
0
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0answers
20 views

Bind9.10 inline signing 'loadkeys' failing

I have using the exact same rndc method to load inline signing keys as what worked yesterday, but today the same steps are failing? a stuck key? # rndc flush # rndc reconfig # rndc addzone domain.com ...
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votes
2answers
43 views

Does Windows Server 2012 R2 Come With A Proxy Serer? [closed]

I'm doing a test project in an attempt to learn how proxy servers work within the Windows 2012 Server R2 environment. Is there a built-in solution within the software itself? If not, what are some ...
3
votes
0answers
15 views

Get floating ip from mmm to work on Tinc vpn on Ubuntu

I've got 3 ubuntu servers connected with a Tinc VPN right now. 2 servers are running mysql 5.6 db's, and the 3rd is used only as a monitor. We're using mmm to do the monitoring and assign a floating ...
2
votes
1answer
27 views

How to mimic “DMZ Host” or “Default Host” NAT funcionality with iptables?

My previous DSL modem had a function called "DMZ Host" (which in other platforms seems to be named Default Host). When you select a computer in your network to be the DMZ Host, it forwards every ...
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0answers
47 views

Change Windows 2012 R2 Network from Public to Domain

I upgraded the Network Card Drivers for my Domain Controller but now it is seeing the local lan as a PUBLIC network which is messing with my firewall rules. How do I switch it back to DOMAIN?
1
vote
1answer
25 views

Why cannot I query DNS with `host -a`, but yes with `host`?

I changed my DNS and I'm having this problem: > host grupoesoc.es grupoesoc.es has address 178.62.234.188 grupoesoc.es has IPv6 address 2a03:b0c0:2:d0::127:6001 grupoesoc.es mail is handled by 20 ...
2
votes
1answer
42 views

How can I put VMware VMs running on different computers on the same network?

I have some (Windows) PCs. I have VMware (Workstation) on each PC. I want to run a VM on each PC such that all the VMs are on one network without the VMs having access to the network the PCs are on. ...
0
votes
1answer
79 views

Dual interface/network with duplicate IP (local and extern)

So, i have two virtual network, a machine with two interfaces, each on a different virtual network (but with the same logical network 192.168.0.0/24 both). eth1 : 192.168.0.10 eth2 : 192.168.0.20 I ...
2
votes
0answers
53 views

how to associate a Docker network interface to a Linux network interface (eth5) on Linux host?

My Linux host has 8 Ethernet interfaces, eth0 - eth7. I'm running three Docker 1.9 containers on this Linux host. How can I associate a network interface inside one Docker container to a specific ...
0
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0answers
20 views

Network adapter blocks connections after 1 hour

Recently imported a Windows 2008 R2 standard server into AWS EC2 Windows firewall is enabled and RDP etc functions ok through it. After exactly 1 hour all network traffic is blocked. Rebooting the ...
0
votes
0answers
10 views

Bridged network tap unable to communicate with client

User has a workstation on OSX that needs to be able to test a variety of VoIP devices by reading all packets sent and received by the test device. Workstation has two ethernet adapters running on a ...
3
votes
0answers
64 views

Windows 10 arp cache getting stuck after failed attempts when target machines are offline

After upgrading our development team to Windows 10 from 7, we are experiencing an issue with the ARP cache where a machine has the correct IP-MAC mapping cached, but the type is invalid due to failed ...
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votes
2answers
71 views

set up secure connection over SSH [closed]

I'm setting up a server application which requires to establish a secure connection over SSH2, e.g. a client must open SSH2 connection to the server to reach specific application: % ssh -s -p5000 ...
0
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0answers
45 views

Configuring VPS as VPN client

I'm trying to achieve that all outgoing connections from my VPS would go through VPN. I've ordered a VPN from a provider and am trying to set up OpenVPN according to their guide ...
1
vote
0answers
70 views

tcpdump on bridge interface (virbr) does not receive any packets destined for one of its addresses

Here's the configuration for the interface: # ifconfig virbr0 virbr0: flags=4355 mtu 1500 inet 192.168.11.1 netmask 255.255.255.255 broadcast 255.255.255.255 ether ...
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0answers
24 views

iptables string match accept connection

With iptables I setup these rules: -A INPUT -s *my.ip.address*/24 -p tcp -m tcp --dport 80 -m string --string "/test.php" --algo kmp -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j DROP When I go to ...
0
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2answers
54 views

iptables: POSTROUTING rule not matching with mark

I have a host that sends packets to virtual machine say on 192.168.0.1/24 with either 192.168.0.11 or 192.168.0.12 as the destination IP. I'm trying to set up the virtual machine as a NAT. It routes ...
1
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0answers
22 views

gitlab port forward tom foolery

We have a public-facing web server (CentOS 6 w/ Apache) that will need to forward requests, both from public and a private interface, to a separate host that's running Gitlab. For security purposes, ...
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votes
1answer
36 views

Active directory one specific account locked out continuously [closed]

one specific account locked out continuously, we have checked antivirus updation also scan no virus so please suggest Server Windows server 2003 client windows 7 pro
0
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1answer
44 views

Can I disable the Base Filtering Service in Windows 2012 for isolating a fault?

I've got an ongoing problem with Windows 2012 incoming connections (I won't go into that now as its on another question). However to do some on-site testing. I believe I need to disable the Base ...
0
votes
1answer
113 views

Running Bloomberg Anywhere Terminal on Server 2012 Remote Desktop Services Environment

Hello Internet Brain Trust! We have a Windows 2012 R2 box running RDS and would like to run the Bloomberg Desktop Terminal. We know of others running this configuration with one difference: -> We ...
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0answers
5 views

use of remote procedure call in NETCONF

I was reading RFC6241 about netconf, where it's said about RPC as a messaging mechanism of the protocol. However, the spec defines XML for transmitting RPC messages, so I don't quite understand why ...