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

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DNS problems with a static IP configuration in a VM

I am using Parallels Desktop 10.2 for Mac on OS X Yosemite. I am trying to configure my my client (Ubuntu 14.04) to host a website that is available to the host via a particular domain name. In the ...
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1answer
23 views

why my nat iptables rules dont work with marked packets?

System: debian squeeze, Linux server 2.6.32-5-amd64 #1 SMP Tue May 13 16:34:35 UTC 2014 x86_64 GNU/Linux, iptables v1.4.8 lsmod | grep iptable iptable_security 2176 0 iptable_mangle ...
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2answers
30 views

Combining two subnets with same default gateway

This is the current situation: Subnet 1: 192.168.1.x (255.255.255.0) with default gateway on 192.168.1.1 Subnet 2: 192.168.90.x (255.255.255.0) without any gateway (no internet access) -> all ...
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1answer
52 views

Multiple DSLs connected to single HP server

networking noob here! Got a pretty specific question. Is it possible to plug 10 cat5 (network) cables that come from 10 different DSL modems to an HP server so I have 10 different broadband lines ...
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6 views

How to route VPN traffic through a separate internet connection with a SonicWALL firewall?

We have a depot quite some distance from the exchange, the expensive internet connection is only getting 2/1Mb. This causes constant drops as soon as someone downloads anything. We have now got a 4G ...
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1answer
16 views

Static route to Single IP using SSL connection

I am trying to configure a static route to a single IP. My question is two fold: How do I specify a single IP using a subnet mask x.x.x.x/? (not a range of ip's) My pc is making an SSL connection to ...
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21 views

Why would my logged public IP differ depending on the type of server (or computer) I am connecting to?

I am writing a p2p gaming lan emulator that uses the torrent infrastructure to network peers, set up lobbies, etc. Currently, the only infrastructure we are using is the trackers (we plan to us Tox ...
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13 views

Connect 1 computer with to 2 networks, route through 1 VPN

Suppose the following scenario: I have a question, I am sure it has been asked but I do not know how to word it or what to look up. My Problem: I am a high school student of an advanced Video ...
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5 views

error 500 web page share point

In my environment we are having 3 branches eg:A B C all the branches are protected with cyberoam firewall also ..and IP to IP trafiic is Allowed to all three branches. Recently A branch is able to ...
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22 views

Filtering KVM guests with IPtables

My partner has a server with OVH that receives a constant variety of ddos attacks, while still staying up. We want to use IPtables on the host to filter the guests VM's traffic. The guest VM we want ...
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0answers
12 views

GigaVUE-420 ERROR: failed in probing PCI device [on hold]

A unit that was picked up was booting to the RedBoot prompt, but I was able to get it to load the image now I am getting the below message on bootup, and then it hangs. +eth0 mgmt port: NO LINK No ...
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0answers
17 views

Routing traffic using IP tables for two NICs [on hold]

I have two NICs (eth0 and eth1). I want to block all traffic (Incoming/outgoing) on eth0 except for port 25 and 993, and allow all other traffic (Incoming/outgoing) on eth1. What's the easiest IP ...
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0answers
36 views

ESXi + pfsense traffic segregation [migrated]

I'm kind of new to setting up networking with ESXi and working with pfsense, so please excuse if this cannot be done or I'm asking something the wrong way. I'm using ESXi 5.5.0 and I want to host ...
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0answers
4 views

Can I use same suricata instance for both IDS (for L3,4) and IPS (for L3,L4,L7)?

I have a interface where traffic is flowing from internet to NGINX server to application server. I want to monitor (IDS) the traffic flowing between Internet and NGINX at L3,4 and IPS the traffic ...
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36 views

Subnetting and VLANs for Multiple Buildings Strategy

Curious for a little feedback on how others do this. A site I'm looking at has multiple buildings connected by fiber and each is on their own subnet. 192.168.0.0 - Building 1 - VLAN10 192.168.1.0 - ...
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73 views

Vendor whitepaper says: 5Mpps no prob. I'm hitting already a wall at 120kpps. Where's the bottleneck?

HP's whitepaper on their Broadcom QLogic NetXtreme II adapters, which includes the specific NIC that I'm testing, states (page 7) that their small packet performance for packets up to 256 bytes/packet ...
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1answer
25 views

Forcing traffic through an IPS on a flat network through a bump in the wire

I have the following topology: Click here, unfortunently I don't have enough rep to post images Essentially I would like the packet flow to go from PC1, to the Core Switch, to the Edge Switch, and ...
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0answers
45 views

Understanding a computer providing a bridge to the Internet [migrated]

Where I work we have a very old Linux machine that is doing our DNS/DHCP and other network services. That machine is our Default Gateway and all internet connections go through this computer somehow. ...
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0answers
28 views

socat TCP file server

I'm trying to set up a simple socat fileserver using TCP to send small files (~100KB). Here are the one-line servers and client for one file: Server: socat -u -d -d OPEN:file.dat ...
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1answer
34 views

Tcpdump/Iptables on bridge interface without assigned IP address

I have set up a bridge interface without an ip on it. $ brctl addbr br0 $ brctl addif tap0 $ brctl addif tap1 $ ifconfig br0 up As seen above, this bridge is connecting 2 TAP interfaces setup ...
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1answer
31 views

CentOS 7 no biosdevname at install time

I know that I can use net.ifnames=0 biosdevname=0 in grub to use eth0 instead of enp0s3 or whatever but how to I specify this at install time in a kickstart file?
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2answers
112 views

Add a fake hop in tracert?

A client wants to add a fake hop when someone does a traceroute on his IP address. He has two ip addresses, and one interface (no problem, virtual interfaces solve it). How should I proceed? Is this ...
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0answers
22 views

Internet access not working on VPN set up with OpenVPN: DNS issue [closed]

I need to set up a VPN using OpenVPN to use it in my project. I did my researches about this subject and I found that the best solution is using OpenVPN. And I try to find a solution to set up a VPN ...
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0answers
9 views

Load balance 2 wireless adapters on 2 different computers (ie. w/NLB)

I have 2 physical servers running 2012R2. Each box has its own wireless nic. I also have 1 SSID to which both servers/WLANs connect to. While trying to setup NLB, I noticed the Wireless NICs didn't ...
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23 views

Multi-subnets topology [closed]

I have an Ubuntu Web Server running on a computer with two physical interfaces. However I need that server to serve 4 different local corporate networks and also be in DMZ and connected to internet ...
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2answers
27 views

iptables blocking script using arp table lookup

I need to block certain hosts (multi-OS) on our LAN from gaining internet access. I decided to try and block certain hosts by mac address via iptables but I can't use the mac address of the ...
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1answer
21 views

route output traffic from specific NAT'ed VM via ip alias

In a dedicated server with several containers behind NAT, I'm trying to route the output / outbound traffic from one of the containers through a specific virtual interface attached to the main ...
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0answers
16 views

home network bridge + access point [migrated]

I want to create a wired bridge to a wifi setup a firewall + intrusion detection and then setup a wifi-access point for lan-out I currently have a d-link 1200 extender setup as bridge, my desktop ...
4
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2answers
52 views

DHCP server on subinterfaces

I have created two subinterfaces on eth0 : eth0:0 with IP 192.168.10.1/24 eth0:1 with IP 192.168.11.1/24 Configured /etc/dhcp/dhcpd.conf like that: option domain-name-server 194.204.159.1; ...
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2answers
48 views

Is the MAC address of the physical host used in a virtual environment?

In an environment with virtual servers, is the MAC address used to communicate, the MAC address of the physical host, or the MAC address of the virtual adapters. If it's is the virtual MAC address how ...
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1answer
35 views

EC2 Network Interface with secondary Private IP, not showing on Interface in Windows

I have a windows server 2012 r2 instance on EC2 under VPC, I have two Network Interfaces. The Primary Private IP is shown in windows for both. I have a secondary IP address on one of the network ...
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11 views

Virtualbox Mac host Ubuntu guest only partial internet connection [closed]

I installed virtualbox on a macbook pro with ubuntu 12.04 as the guest. I took the default network connection of NAT. From the guest, I can ping external servers, and ftp to them. However, any ...
0
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1answer
34 views

How will the LAN to LAN firewall rule affect the traffic in the rest of the network

I have a following network setup (of course a bit modified from the real situation) I would like to setup a LAN to LAN rule on the ZyWALL firewall so that only certain ports/ip adresses are allowed ...
0
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1answer
26 views

Enlarge IP Network Address Space

Our small company uses a 192.68.0.0/24 network. As there are only 256 IP addresses, we will be running out of IP addresses soon. I wonder about the best strategy to change the network. Some devices ...
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2answers
29 views

Is a “bridging device” required to join two networks?

We're considering two NBN fibre connections to the Internet (NBN is a fibre connection for those of you not living in Australia), with each connection having it's own subnet. The first connection's ...
0
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1answer
44 views

Windows Server 2012 - Prompt on accessing network resource from server hosting resource

Here's an odd one that I've not been able to crack. For my home lab setup, I've got two near identical physical servers that run Windows Server 2012 R2. The goal of my home lab setup is to be able ...
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1answer
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Windows 7 x64 Enterprise all network printers greyed out on reboot

We've got a bunch of network printers on SL7 running CUPS. These are distributed via GPP printers. This all works with older images. In the last week or so, new installs from the same base image are ...
1
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1answer
42 views

VPN (PPTP) connects successfully but unable to ping some devices in the LAN

My working company has this router (Cisco RV042G Gigabit Dual WAN VPN Router) and it has the IP 192.168.1.1 with subnet mask 255.255.255.0. It has 3 devices directly connected to its LAN ports, an ...
4
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1answer
71 views
+50

Iptables LOG rule inside a network namespace

I'm trying to setup iptables rules for a docker container. I'm using nsenter to execute the iptables command inside of the container's network namespace: # log access to port 8080 PID=$(docker ...
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0answers
32 views

Router behind router [migrated]

To extend my wireless upstairs I salvaged a second router and have been trying to set it up so that: SSID matches with primary router Password matches with primary router Secondary router: Dlink ...
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0answers
14 views

local network : route to host going through the wrong switch [closed]

I have two main switches on my building , one in the data center(3COM 2948 SFP PLUS) and another in the administrative area (3COM 2952 PLUS) both in the same network, dhcp disabled. I am close to the ...
3
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0answers
76 views

Multiple Websites on Multiple Servers behind One Public IP

Brief I’m currently working on a project to bring two of our hosted servers (one email, one web) in-house to run alongside our other web server. Hosting one web server is fairly straightforward, but ...
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2answers
41 views

DNS: Root hint server 2001:500:1::803f:235 must respond to NS queries for the root zone

We are using IPv4 in our company. Our ISP does not provide IPv6 and this won't change in the next years. The Best Practices Analyzer (BPA) of our Server 2012 R2 DNS server warns about the IPv6 DNS ...
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0answers
33 views

AWS SSH Session getting closed by Server intermittently

I have connected to the AWS EC2 Ubuntu instance using putty on Windows 7(ppk authentication). Most of the time I'm getting this message on putty: Network error: Software caused connection abort. But ...
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1answer
54 views

Trouble understanding how to setup network Bridge on Ubuntu 14.04.2 to act as a web content filter

I am trying to build an Ubuntu server to act as a web content filter, using Squidguard and Dansguardian. There are great resources such as this: ...
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1answer
32 views

Hide OpenVPN client's IP

Is it possible for a OpenVPN server letting clients communicate with one another and they do not know other's IP in VPN? My VPN server is ubuntu 14.04 32bit
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0answers
42 views

Hyper-V, Subnet Masks, External IP Addresses, Hetzner [closed]

I am pretty new to this so I am going to try and explain this as best as I can. All Servers I have dealt with in the past have always had an internal IP address, the external access has always been at ...
1
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1answer
33 views

Can't get iptables working in VPS - state and conntrack not possible

I've been browsing and reading documentations all night and I can't figure out any solution... I'm trying to get iptables working on my VPS (Debian 7). But I can't get established connections ...
1
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1answer
29 views

What is wrong with my simple dnsmasq setup?

I have dnsmasq running on a server (its IP is 10.10.31.22), let's say its hostname is mydns here's the dnsmasq.conf: domain-needed bogus-priv local=/argonath.mydomain.com/ interface=eth0 ...
2
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1answer
47 views

Linux TCP connection establishment is very slow

I'm not sure what's wrong, but every outgoing network connection is very slow on my server (called dikkenek in the snippets below). It seems it's at the connection establishment. bicou@dikkenek:~$ ...