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

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175 views

Openstack with no fixed range

I test-drove various Openstack installations (devstack, offical guides and so on) on VM's and me&my devs love it, so we acquired the HW to set a small production cluster (3 IBM x3650, 4 ethernets ...
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2k views

Issue with Netgear GS108T Managed Switch and Jumbo Frames

I recently purchased a Netgear GS108T managed switch and I am trying to configure jumbo packets between my NAS (Thecus N4100Pro), PC and managed switch. I should mention the fact that I was able to ...
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231 views

How do I make dnsmasq serve IP addresses via IPoIB?

I have a cluster farm that I'm setting up. The nodes (computers in the farm) are connected via ethernet & IP over Infiniband. I'm needing to netboot the nodes and thought dnsmasq would fit well ...
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907 views

Clickonce applications being allowed through firewall

The company I work for uses an application that is deployed through clickonce. This means that everytime they update said program the program regenerates in a new location ie: C:\Users\%username%\...
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2k views

Outbound traffic being blocked for MIP/VIPped servers (Juniper SSG5)

As we've been having some problems with sporadic packet loss, I've been preparing a replacement router (also an SSG5) for our current Juniper SSG5. I've setup the new SSG5 identically to the old one. ...
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583 views

VMware - Broadcom 1000Gbps NIC does not link at 100Mbps to a Cisco switch port

Today we've stumbled on a very awkward situation with our VMWare Server. The server is with ESX 3.5 that has a 1Gbps NIC. We bought a brand new managed Cisco Linksys switch with 10/100Mbps interface ...
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352 views

Setting PHP remote write permissions in IIS7

I have two windows server 2008 servers. One is a web server one is a file server. A php script runs on the web server and is supposed to write to the other server. I am getting a permissions error. I ...
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803 views

Getting ipsec-tools to work between Ubuntu Lucid hosts

I have two hosts, one is Charity with IP 67.207.128.184, the other is Hope with IP 67.207.130.204. I've installed the ipsec-tools package on each host. I have not installed racoon on either host. ...
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484 views

File property information (last write time and file size) in explorer out of date by hours over network folder share

An application is running on a windows XP prof machine picking up file from a network share from another windows machine. It detects that the file has been updated (by date and time or optionally ...
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128 views

How to configure MODBUS on a Cyclades TS100?

I have a Cyclades TS100 which is used to communicate with a Modbus Slave. I selected Protocol: Modbus and configured MODBUS Serial Mode: RTU The thing is, I event don't get a connection to the Serial ...
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47 views
+100

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 ...
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7 views

Systemd Networkd [Match] Rule Multiple Matches

If I have a static network configuration like this: [Match] Driver=mlx4_en [Network] Address=10.1.0.10/24 Gateway=10.1.0.1 DNS=8.8.8.8 and say I have a dual port NIC which uses the driver mlx4_en ...
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13 views

How can I find the docker-machine network adapter name for a docker container?

I would like to introduce network variability into docker containers. Specifically, I would like to be able to run commands such as: sudo tc qdisc add dev vethecb732a root netem delay 500ms 400ms ...
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51 views

Iptables firewall causing instability

I've made a script to set an iptables firewall,but it's Causing instability on the local network aplication . The firewall is droping the connection between the clients and the server for a while ...
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59 views

Failed to bring up eth0; can't establish any network connections

So for 1,5 years now I was running a DigitalOcean droplet without any problems. did apt-get upgrade several times, changed some things - all fine! Last night suddenly all my alarms went off and my ...
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33 views

RDP Connection Times out Only When Connected over SSH Tunnel

I have an interesting issue. let me describe my setup: I have a server at home that serves as my Virtual Machine Host. All of the computers here are VM Computers, I don't think that makes a ...
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21 views

Can't ping my LXC container

I have set up a linux container on my server. The problem I have right now is that I cannot ping my linux container from my laptop, but I can ping the hypervisor. I created the LXC by using: lxc-...
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22 views

KVM/libvirt: NAT forwarding virtual bridge to host bridge

I currently have a VM setup where only a few 'special' VMs are allowed to have outward facing IP addresses and the rest aren't. All of them are configured with two interfaces attached to a virtual ...
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14 views

Sonicwall TZ205 with EnGenius ESB300 as Guest Wireless AP, Need to keep networks apart

I have a SonicWall TZ205 with an EnGenius ESB300 as a Guest Wireless AP. I would like to keep these networks segregated. Interface X0 is the LAN, X1 is WAN and the EnGenius is connected to X4 in AP ...
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19 views

Two users behind same NAT (PSK or EAP) - strongswan

I have a strongswan implementation and am running into an issue where when there are two users behind the same NAT, the second one "kicks off" the first one. I was able to resolve the issue using: ...
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20 views

Port forwarding from external providers in AWS VPC

I'm looking for general feedback regarding allowing external services access to your Amazon AWS VPC. I'm mostly wondering how other people go about doing this. If you're using an external service like ...
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19 views

GNS3 - Connecting Emulalated IOS to TWO PHYSICAL networks

I have a CISCO c3725 router on GNS3 connected to two different and separate unique LANs via the CLOUD/HOST icon, attaching each of the virtual CISCO c3725 to my computer's physical NIC (NIC 1 and NI2.)...
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48 views

linux veth use existing peer interface

I have a sit tunnel interface which I want to transparently connect with one end of a veth pair so that everything that drops out of the tunnel interface flows through the veth interface and vice ...
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11 views

rfc2307bis LDAP schema: ipNetmaskNumber lookup for an ipHost object

I'm using Openldap for IAM, and consider using it also as a configuration management backend. The rfc2307bis schema has an ipHost class, which allows for ipHostNumber attribute, but not for the ...
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36 views

network device enrollment service greyed out

I've recently installed AD Certification Authority on one of our DCs. It acts as a subordinate enterprise CA, the Root CA is a standalone offline root CA and there is no connection between those two ...
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34 views

cisco asa public server nat issue

I have been tasked with some ASA configuration coming in a few weeks, and to test out some configuration options I have setup a web server on my local network which I would like to be able to access ...
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16 views

Windows Server 2012 Printer Management

I want to add a shared printer connected to a host IP (192.168.0.10,windows 7) , to a server (192.168.0.200,windows server 2012). When adding a printer using the Printer Management just the IP ...
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51 views

How to connect to a service on a local network machine whch which only listens to localhost?

I have a service which only listens to localhost on port 7400. There is a service running on a windows and an ubuntu machine on a private network. How can another computer on the same network ...
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29 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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41 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 ...
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30 views

ifconfig output different for non-root user

we use a montoring system to capture network traffic. the output as root user is fine: eth0 Link encap:Ethernet HWaddr 00:1E:67:E6:D6:FE inet addr:149.56.19.13 Bcast:149.56.19.255 ...
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56 views

Drop fragmented packets in nftables

Using iptables is it possible to block fragmented packets with this rule: iptables -A INPUT -f -j DROP But there isn't a equivalent in nftables. There is any way to do it?
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41 views

Connection to specific firebird 2.5 server is slow

I have the following setup: Two laptops connected to a network using the same switch Multiple Windows Server running Firebird 2.5. My problem is that when I try to connect to one specific firebird ...
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22 views

ipSystemStatsOutDiscards increments, but not the interface specific counters?

Here's an odd one. I noticed that one of my nameservers was complaining about some outbound congestion, and that it seemed to correlate incrementing interface discards on my outbound path. Open and ...
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63 views

Joining a UDP multicast through a server on the other side of the tunnel

I've drawn a diagram below to help with this question! So a company published a multicast UDP feed (company A) and another company connects to it (Company B). I have a point-to-point tunnel to ...
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42 views

How to configure firewalld for source-specific rules?

I have a server in a datacenter that serves as an IPA master and VPN server. For simplicity, assume I need to enable the "ipsec" service for VPN, and the "kerberos" service for IPA. I would like to: ...
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43 views

Understanding arp request tcpdump

I noticed the below tcp dump when pinging a docker container B on bridge B from a docker container A on bridge A. Container A: 10.0.0.3 / 02:42:0a:00:00:03 Container B: 10.0.0.4 / 02:42:0a:...
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64 views

forcing proxy traffic to route via a specific 3G dongle interface

I've searched for details on how to do this but I've been unsuccessful - I wondered if someone could offer up some advice. I have 2 network cards (LAN and 3G in my case), LAN is my main interface (...
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1k views

Using NAT in qemu

I have used Qemu to install a windows xp guest. The command I run is qemu -m 2048 -gda winxp64.img \ -boot d -usbdevice tablet \ -enable-kvm -vnc :10 \ -netdev user,id=network0 -device ...
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38 views

How to correctly set up a bridge interface in GCE

I'm trying to set up a bridge interface as described in many docs, for instance: https://help.ubuntu.com/community/OpenVPN My setup in identical to that one, except obviously I used my GCE internal ...
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30 views

Configure Cisco QoS for VLAN

I have two VLANs (20 and 21) that are accessing the same resource on a switch. Clients on VLAN 20 access this resource only at schedule times, but when they do, they generate lots of traffic as they'...
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25 views

IPsec: hide private IP behind Gateway IP

I have an IPsec Gateway to a customer, and the VPN tunnel is up, the problem is that they don't allow me to use my private address because it used by another VPN they use. Our gateway is an EC2 ...
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28 views

iperf actual send rate always lower than the expected target bandwidth until some equilibrium reached. Why?

I did an UDP iperf 2.0.5-Ubuntu test between two VMs on the same hypervisor. As can be seen in the iperf output below I started my first test with "-b 686M" flag. However, iperf reported that it was ...
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17 views

trouble setting up a small network- Can't Ping BorderGateway

RTR Configuration : http://pastebin.com/Pg4SxG65 Network Topolgy: https://goo.gl/h043A7 BR: its an RV320 if you guys need some info let me know. It's running DHCP to provide ip address to the ...
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53 views

Dealing with refreshed IP addresses in Docker

I'm trying to wrap my head around Docker and the various tools around it. And a common problem for me is that if my VM's are restarted, they might end up with different IP addresses. e.g. VirtualBox ...
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58 views

Cannot Route RDP Traffic Through AWS Site-to-Site VPN

Hi I have establish VPN connection to the AWS VPC, but still there are some routing issues that make RDP connections fail to initiate, because the router WAN IP is differs from the Public IP, lets say:...
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30 views

rx_queue value in /proc/net/udp grows to twice the SO_RCVBUF value

When using an SO_RCVBUF of 10485760 (which is also the current limit as stipulated by sysctl's net.core.rmem_max setting, and sending UDP packets faster than the receiving side is able to handle, the ...
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29 views

How do I set up multiple displays for a single computer over ethernet

Currently I have 4 computers in separate rooms, connected through ethernet. It is a dental clinic and those computers are used to plug in some equipment via usb. I was wondering if it would be ...
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84 views

How to prevent persistent naming of network interfaces, like eth1

I have a freshly installed Debian Jessie. I had two NICs, which were eth0 and eth1, now I took out one, however I still have eth1 left in the system: % dmesg ... tg3 0000:03:00.0 eth0: Tigon3 [partno(...
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56 views

Change NAT IP for Proxmox (Keep host IP)

I have a Proxmox server with many IPv4 addresses available to it. As it stands, an instance (Either LXC or KVM) that connects out to the Internet will be connecting from the host's IP address. For ...