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

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Can I add a static route to a VPN network if the default gateway IP is dynamic? (Windows 7)

Can I add a static route to a VPN network if the default gateway IP is dynamic? (Windows 7) This is easy to solve with a permanent route if the default gateway does not change as you can do this: ...
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4 views

distribute and install packages in google cloud platform

I need to run some MapReduce task on a linux cluster which supposes that on each reducer I run some specific algorithm stored in a package. Is it possible to install packages on a Google Cloud ...
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1answer
23 views

Using gateway on remote network to reach another subnet

I have the setup like this: VPN Clients VPN Server 10.1.1.2 10.1.1.1 ---> Internet 10.1.1.3 10.1.1.4 10.1.1.5 | \ 10.0.0.0/24 LAN The VPN clients are using the VPN server as ...
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13 views

Cannot Ping DC with expanded scope

i have inherited a network and do not know how to find the culprit here is the setup 1. Server 2008R2 with DHCP 2. 2 nics, 192.168.1.6 Static, 192.168.2.254 nic 2 3. Subnet 255.255.0.0 4. Scope is ...
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37 views

Can't ping domain controller from PC on a remote subnet

In trying to connect a PC from a remote subnet to our domain controller. Initally the domain controller couldn't contact the pc, but resetting the vpn connection resolved that. Currently the PC from ...
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87 views

Networking with Direct Attached twinax cables

This shows my lack of experience I think. But, I added 2 port 10G SFP+ cards to 3 dell R610 servers running windows 2012. Then I connected them together using direct attached twinax cables. At the ...
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1answer
38 views

differences between adding ip route to system and adding additional ip address

I found that I can add an additional ip address to a network adapter which appears to be solving my problem of having multiple devices I need to talk to which are on different subnets (but same ...
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2answers
23 views

Share folders for different network cards

I have a server WS2008R2 with 2 network cards (Both are on the same LAN) Eg: server1 IP1: 192.168.0.2 IP2: 192.168.0.3 I'd like to share some directories on IP1, and other directories ...
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1answer
26 views

Use WAN as internal network

Suppose I have a little web infrastructure for serving clients that contains nginx as a frontend server, couple of backends (upstreams), a messaging system, db and so on. This stuff is located on ...
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0answers
55 views

Create Bridge interface on linux board

My current configuration and topology look like below: +++++++++++++++++++++++++++++++++ +++++++++++++++ | Linux Board eth0 | | Switch | | with openWRT ...
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1answer
37 views

Patch panel confessions

So the old IT guy was a college student with no experience prior to be hired beyond some classes. The one before him had no experience at all and just did his best with what he had. Now I am here and ...
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35 views

How to troubleshoot network bandwidth limitation

Using a dedicated server with 3gbps connection streaming, server crashes at 1Gbps. Pings go from 20ms to 100-500ms, server is slow or unresponsive, streams start buffering or drop. dmesg |grep eth0 [ ...
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32 views

Error: Cannot open NBD: No such file or directory

I was testing nbd-client. Followed the steps as: server: sudo dd if=/dev/zero of=/mnt/dhini bs=1024 count=36000 $ sudo mke2fs /mnt/dhini mke2fs 1.42 (29-Nov-2011) /mnt/dhini is not a block special ...
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2answers
112 views

Is this my network being flooded?

I noticed this strange pattern on the bandwidth graph of the pfsense firewall on my work network: If I'm reading it righ, there is a constant stream of 6 Mbps data going from the local network into ...
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0answers
21 views

Network syslog with port number

I am collecting syslog from VoIP phones over the network and it is usual having several phones behind same NAT device. I need to collect syslog files to different files or be able to differ lines ...
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0answers
7 views

Virtualbox - how to custom NAT and port forward? [migrated]

How can I use Virtualbox custom NAT and also port forward? For demos, I am running my VMs behind NAT on my laptop. If I run it in the vanilla NAT mode, then each VM I spin up automatically gets ...
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0answers
46 views

Linux: Same static IP configured for all NICs

I am shipping some servers out to remote colo sites. I want to configure them so at the other end any port can be lit-up and the boxes will be good to go. I had originally been planning on bonding ...
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2answers
94 views

How to tell if someone is trying to use my IP Address?

I use a relatively low-cost host for my personal server, and occasionally I get a rash of downtime alerts. These are all from today. If my host were to ("accidentally") assign my IP to someone ...
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1answer
48 views

iptables slow down connections

When I enable iptables (v4/v6) for my server, every connection like ssh, imap, smtp, http, https and so on are slow down so if I try to connect to ssh, it tooks up to 30 (!) seconds. The imap service ...
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30 views

Can I specify a port when connecting to a Windows share?

I have a network setup like this (Windows File Server) <-> (Windows Gateway) <-> (Workstation). I am trying to allow the Workstation to access a share on the Windows File Server. I was ...
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1answer
58 views

Private communications between AWS EC2 instances

I have three EC2 instances with elastic IPs. Each one contains a server. Each server needs that TCP ports 8181, 2181, 2888 and 3888 are opened on each machine. Each server should have the possibility ...
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3answers
35 views

Ubuntu / iptables: Using a server as middle-man to talk to firewalled server [duplicate]

I have a situation where I need to communicate with an API that only allows connections from one particular IP. So api.example.com accepts connections on port 443 from whitelisted-ip I want to be ...
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1answer
24 views

How to configure bridging

I am trying to configure a bridged network in a CentOS machine created with virtual box. I already did the same on two ubuntu 12.04 machines, and this is how the /etc/network/interfaces file looks ...
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1answer
51 views

Benchmarks for server response time [closed]

I was testing my website’s performance on Google Page Speed and it mentioned the response time at It average between .6-.8 seconds. What’s the optimal server response time that’s acceptable? Is ...
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2answers
106 views

Trouble Connecting with Cisco VPN client reason 412

I'm using Windows 8.1 trying to connect to an Office using Cisco VPN. I try to connect and after a few seconds I get this: The Secure VPN connection terminated locally by the client reason 412: ...
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2answers
232 views

What problems result from servers not time-sync'd?

What problems might arise within a domain when the member servers are not properly time-sync'd? I'm aware that log entries are incorrect making troubleshooting more difficult in time-sensitive ...
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0answers
32 views

Unable to access ISP gateway user interface

I am hoping that someone can assist. I have a Windows 2012 Server that is a domain controller and serves local ip addresses out on our network (DHCP). Everything is working fine with the exception of ...
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0answers
30 views

Windows 8.1 stops responding to ping after user has signed off [migrated]

When i sign out of my win 8.1, it stops responding to pings from my other machine. This win 8.1 is installed on a laptop, so I guess this may be a power plan issue, but currently I have power plan ...
2
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1answer
86 views

cannot ping linux network namespace within the same subnet

Here is a quick summary of the issue. I cannot communicate with a linux network namespace within the same subnet. I am running Ubuntu 14.04.1 LTS on a headless server. I have been troubleshooting this ...
6
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1answer
138 views

Is it possible to process millions of datagrams per second with Windows, using a vendor agnostic API? [closed]

I am investigating if I can implement an HPC app in Windows that receives small UDP multicast datagrams (mostly 100-400 Bytes) at a high rate, using a dozen or up to maybe 200 multicast groups (i.e. ...
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1answer
54 views

WAN IP Ranges and NAT [closed]

Let's say we have a router with a WAN IP assigned by DHCP: 1.1.1.1/255.255.255.255 The ISP subnet for it's lan interface is 82.5.167.161/255.255.255.248 My firewall behind this router is on WAN IP: ...
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1answer
51 views

Can not connect into a subnet across a StrongSWAN VPN

This is a simplification of a bigger problem I'm experiencing, but I think it covers everything. The production issue is between a StrongSWAN VPN and a Juniper SSG550. The network setup is clearly not ...
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1answer
50 views

Low TCP down speed on network interface

We have HP Proliant ML370 G6 server with 4 gigabit ports on it. 3 ports work well, but 1 (LAN1) cuts TCP Down traffic. TCP Up and UDP is ok. Here is the speed test result. Here is the windows monitor ...
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3answers
123 views

vSphere ESXi 5.5 Windows Guest Network card not active after reboot

Problem: Windows 2008 R2 or Windows 2012 servers have no network access after a reboot Not all VMs affected, but multiple VMs and mulitiple hosts. Windows Network configuration shows the correct ...
1
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1answer
39 views

Routing issue on Linux with Mobile Broadband

Note: This is a "cross-post", I asked this same question on "superuser" StackExchange site, but without obtain any answers, just a comment (now curiously disappeared). I've thought this site is ...
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0answers
59 views

kvm guest routing with 2 default gateways

I have a kvm guest with two virtual NIC. NIC with internal IP III.III.III.III (eth0) NIC with external IP EEE.EEE.EEE.EEE(eth1) I'm using macvtap. The host has his own external IP. I can ping ...
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1answer
27 views

NAT forwarding (whole IP) working only on some ports

Since my hoster doesn't allow briged setups I had to go for a NAT solution to run my CentOS VM on an additional IP and my host machine on the primary IP. Now, I've got a problem since for ports 22, ...
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0answers
19 views

Routing is disabled for LAN users while choosing all-net for IPSec tunnel

I have VPN with L2TP/IPSec server and tunnel configured. When I choose all-nets 0.0.0.0/0 to allow connection from any computer in the world, all LAN users with subnet 10.0.0.0/8 are disconnected from ...
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1answer
41 views

Share a folder programatically with custom credentials

Is it possible to share a windows folder with custom credentials (rather than a windows account)? I'm developing internet cafe software. I want to mount a desktop folder from a network share upon ...
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0answers
26 views

GPON Gateway Settings

So recently my ISP installed optical fiber device. From the device description according to the gateway setting, it's a GPON Device The default package by the ISP is set to 4mbps. But when I started ...
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1answer
65 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
57 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 ...
0
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1answer
58 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 ...
0
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1answer
60 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 ...
0
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1answer
31 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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35 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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18 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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1answer
72 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 - ...
16
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1answer
228 views

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

HP's whitepaper on their QLogic (fka Broadcom) 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 ...
0
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1answer
33 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 ...