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

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2
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3answers
949 views

How to speed up Drupal 7 with remote DB (not DNS resolving)

we have Drupal 7 on Ubuntu LTS virtual machine (VMWare) with MySQL 5.1 server on the same physical server, but on a different virtual machine. The Drupal website is currently under development, ...
0
votes
1answer
853 views

Redirect some specific traffic to a different gateway

I have two gateways with different ISP, one of them defined as default for the LAN user and the other ISP used as the default for the Servers and VPN traffic. This is done using regular routing tables ...
1
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0answers
6 views

How to set up a hotspot with socks5 proxy [migrated]

I have a laptop with linux installed on it. The laptop has two network interfaces: eth0 and wlan0. Normally I surf the Internet through eth0, and I've successfully set up a hotspot in linux for my ...
10
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3answers
1k views

Native VLAN mismatch and missing VLAN?

I'm trying to wrap my head around what exactly is going on here with a new site's configuration of their networking stack. This particular piece I am working is pretty simple but I having a hard time ...
1
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0answers
57 views
+50

CoreOS bare-metal vlan networking

I need to write a CoreOS Cloud Config file in which I need to setup networking. But i have a problem because I have a bit weird environment. What I'm trying to accomplish; I have a Sophos UTM thats ...
1
vote
1answer
3k views

ping works but ssh fails

machine1 IP: 172.30.11.119 machine2 IP: 172.30.11.120 machine3 IP: 172.30.11.121 machine4 IP: 172.30.11.122 Note: These machines are connected to LAN. I have configured the static ...
0
votes
1answer
20 views

NAT to two different servers on the same port via hostname with Mikrotik RB2011

I have a Mikrotik RB2011 router, running RouterOS which connects to the internet via a static IP. In my lan I have two different servers, one that is on IP 192.168.89.11 and another on 192.168.89.12 ...
1
vote
1answer
891 views

TCP Zero Window with no corresponding Window Update

I am trying to debug a network issue and am using Wireshark and tcpdump to grab packets from my server. I have one client application that is grabbing all my available connections and then holding ...
0
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0answers
3 views

Network loss after installing Hyper-V [migrated]

I am running Windows Server 2012r2, after adding Hyper-V my NIC thinks it is unplugged although I have activity lights blinking. mobo: MSI A88X-G45 Gaming I'm using the latest Win8.1 x64 (since ...
0
votes
1answer
37 views

How to expose DomU's to router network?

I currently have a server connected to a router through a single NIC. The server has a running XEN setup with several DomU's. Everything seems to work fine, I can access internet from both Dom0 and ...
1
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0answers
18 views

how multicast stream passes when receiving locally

If suppose I have TX application which transmits UDP multicast to 239.0.0.1:1234. And I have RX application which joins multicast (239.0.0.1:1234), and receives this multicast (239.0.0.1:1234). I ...
5
votes
2answers
2k views

“cat /proc/net/dev” and “ip -s link” show different statistics. Which one is lying?

I notice that /proc/net/dev says eth3 has 1753 drops. ip -s link shows 0 dropped. Why is there a difference? Where is the different data coming from? Which one is correct? I've stripped the out extra ...
0
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2answers
307 views

How can I route some (but not all) web traffice over a VPN tunnel. Sonicwall appliances on each end

I have two networks: Network A Private 10.0.0.0/24 Network B Private 10.0.10.0/24 Both running Sonicwall ~200 appliances, connected by a VPN tunnel. I am able to reach specific internal address on ...
3
votes
1answer
195 views

Overlapping subnets - VPN

I have Site to Site VPN on Debian box which is setup by rackoon. It works fine, however because subnetworks overlap NAT is used on both ends of the VPN (1.1.1.1/32 & 2.2.2.2/32) On both subnets I ...
2
votes
2answers
1k views

IP Conflicts from mikrotik router for multiple ip addresses (that it isnt assigned)

I have a point to point wireless connection using two mikrotiks. When I plug the mikrotik into a switch with just my laptop I get an IP address conflict on my machine no matter what IP I am assigned. ...
4
votes
6answers
38k views

Ping returns an IPv6 address

I have 3 servers, a DC an exchange server and an apps server. If I ping the DC from any server or ping any server from the DC I get an IPv4 response, as you would expect, however if I ping exchange ...
1
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0answers
84 views

trying to reach a port forwarded server from the subnet using the public IP not working

I set up a server which is connected to my router. The router forwards a port of my server. So when I scan that port using http://www.t1shopper.com/tools/port-scan/ I got: 188.143.126.14 is ...
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votes
1answer
23 views

Switches without SFP and with SFP

So I am looking at two different rackmount switches, one I do not have SFP ports on there and one that does. Would it be possible to have those two switches linked up through just looping through ...
1
vote
1answer
33 views

KVM bridged network like in virtualbox

I have a server with 3 NIC's with OpenSUSE 13.2 and KVM installed. I have installed Debian as guest. My network is 192.168.88.0/24, DHCP server is at 192.168.88.1. Now I want my guest to also get a ...
0
votes
2answers
17 views

LDAP config for Novell export

I am trying to export the email userlist from groupwise via the consoleOne export tool.. In the tool, they ask for some basic LDAP parameters that make little sense in the GUI (I dislike GUIs). ...
-1
votes
0answers
10 views

Privoxy - Route certain traffic through VPN [migrated]

I'm trying to setup privoxy so certain traffic is routed through a VPN tunnel. The idea is: Clients -> Server running privoxy -> send requests directly or through VPN based on URL. I already had a ...
0
votes
1answer
21 views

Unable to connect the Ubuntu EC2 instance to VPC LAN on AWS using secondary NIC adapter?

Infrastructure setup: VPC is created with 192.168.254.0/24 netwok Private subnet within VPC (Virtual Private Cloud) is created with 192.168.254.0/25 network Public subnet within the VPC is created ...
0
votes
2answers
941 views

Access print server through firewall?

At my workplace, we have two fiber networks setup, one for the business network and the other for process control (industrial manufacturing). On the business network, there is a standard print server ...
1
vote
1answer
40 views

Forward one IP to a docker container

As far as I understood, docker run containers with their own IPs, and fully open ports, on the bridge interface docker0. Let's say I launch a container, and it has its own IP: 172.17.0.11, and I have ...
2
votes
2answers
1k views

Network connection to Firebird 2.1 became slow after upgrading to Ubuntu 10.04

We've got a setup that we're using for different clients : a program connecting to a Firebird server on a local network. So far we mostly used 32bit processors running Ubuntu LTS (recently upgraded ...
1
vote
1answer
1k views

How to force certain traffic through GRE tunnel?

Here's what I do. Server (public internet is 222.x.x.x): echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf sysctl -p iptunnel add gre1 mode gre local 222.x.x.x remote 115.x.x.x ttl 255 ...
1
vote
1answer
30 views

How to reconnect to the backend with HAProxy

I'm new in working with HAProxy. I couldn't figure out how to make HAProxy to reconnect to backend that was down and started up back again. I have a configuration of two backend servers. When they ...
0
votes
1answer
10 views

Keep showing old processes in nethogs

Nethogs stops showing idle processes after a while. How can I make it keep showing them? I want to have a complete history of processes for long time. Is there any alternative to nethogs?
3
votes
0answers
16 views

Filter mirrored port traffic using iptables

I receive traffic from a mirrored port and I would like to send it into an NFQUEUE for processing. Because of the mirrored port, the packets destination MAC addresses are not my host MAC address. ...
0
votes
2answers
200 views

host with default gateway as itself

I am facing a peculiar problem. Earlier we had 4 network segments in our production setup, say segment A,B,C and D. A,B and C are able to communicate with each other,the corporate lan and the ...
0
votes
1answer
42 views

Linux: iptables and marking confusion

Before I ask my question, let me first pose the situation: I have 2 network interfaces: eth0 and eth1 I bridge those 2 (using brctl) and form a new interface: br0 This bridge gets the ip address ...
1
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2answers
2k views

Unable to connect via NetBIOS Name

I can't connect to machines/shares by NetBIOS names. Below is console output showing the problem. C:\>nbtstat -n Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] ...
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votes
0answers
4 views

cant ping specific device [migrated]

i have these nodes on the same network Sasmung GT-S5300 192.168.12.38 Asus Zenfone 5 192.168.12.37 pc(windows 7) 192.168.12.36 i tried to access my pc with my samsung through web browser, and ...
0
votes
2answers
11k views

Fortigate 200A firewall CPU high resource usage

This morning I'm receiving complaints from several end users that saying their whole department network are slow and have intermittent. Therefore I've checked our firewall to see whether if something ...
2
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0answers
46 views

Is it at all commonplace to make service available via the same host as its redundancy, just different ports? [on hold]

I am writing software that allows for the configuration of parameters for authentication with a Primary and Secondary RADIUS server. Server administrators, in your experience, is it common or not for ...
1
vote
1answer
1k views

Assign ipv6 address to KVM guests on bridge mode

System: CentOS 6.5 Network: Bridge on br0 IPv6: ISP Native /64 block. IPv4: ISP address (not internal LAN) Purpose: To assign IPv6 only to guests (manually), I don't want ipv4 address to be ...
0
votes
1answer
39 views

Forwarding Ports on Centos 7

I'm working on a CentOS 7 server and I'm trying to get JBoss to work the way I want it too. I'm running Java 8 and JBoss(wildly) 8. I have gotten those installed and working on the default ports, ...
1
vote
2answers
1k views

Smoothwall Express interface issues

I have a SmoothWall Express box that is currently configured with a Green and Purple interface. Both interfaces are in the same /24 subnet (which seems odd to me). The green interface (address of ...
2
votes
0answers
47 views

Current state of Tinc 1.1? [on hold]

So as probably any Tinc user ( www.tinc-vpn.org ), I noticed there are two versions: 1.0 and 1.1. On the website is explained that 1.1 is the stepping stone for 2.0 and that it has a lot of neat ...
6
votes
1answer
662 views

High throughput meshed VPN to connect datacenter hosts

We're renting a number of hosts in a public datacenter. The datacenter does not offer private VLANs; all hosts receive one (or more) public IPv4/IPv6 addresses. The hosts come with very modern CPUs ...
1
vote
1answer
727 views

Routing default gateway for 2nd vlan over a tunnel (linux/tinc)

Fixed: It turned out to be a combo of what BatchyX said (missing the 172.16.101.0/24 route on the remote end), and tinc on the remote side failing to run a -up script (the script wasn't executable). ...
1
vote
2answers
42 views

Rotating outgoing IP's

I want to rotate IP addresses for web-scraping, and here is my setup: I have configured multiple IP addresses as below in my /etc/network/interfaces file: # The loopback network interface auto lo ...
0
votes
1answer
858 views

IP setting in CentoOS 6.2x64 by XenCenter 6.2

I have setup a Guest CentOS virtual machine in Xenserver.. I have updated the Xentools but i cannot find the option to config my IP Address which is showing to be 'unknown' currently. All i need to do ...
1
vote
7answers
3k views

My Windows 7 PC receives a double gateway from the DHCP server. Why?

I have a windows 7 pc in a windows 2003 server environment. every now and then (about twice a day), the gateway setting is changed to 0.0.0.0 and 192.168.1.1. Now, the 192.168.1.1 setting is correct, ...
1
vote
2answers
1k views

Untangle VPN setup, how to see internal addresses?

So Untangle is setup as the default gateway at 192.168.100.1/24, it is the authorative DHCP server issuing addresses from 192.168.100.100 to 192.168.100.200 and is successfully connected to the ...
0
votes
0answers
17 views

Path throughput estimation with one cooperating host only [closed]

I need a Linux tool that estimates throughput on a path where the host at the other end is not actively cooperating. This means that I can not use tools that establish a TCP connection. However, we ...
-1
votes
1answer
29 views

Capacity Planning - Servers / Equipment vs Bandwidth [closed]

I am not a tech person, and I am researching a company as an investor. This company does live streaming / webcasting. Not surprisingly they have really high bandwidth costs, but I was surprised to ...
0
votes
1answer
851 views

How do I connect two Cisco Catalyst 2950 over LAN?

I'm trying to connect (2) Cisco Catalyst 2950's over each's respective FastEthernet 0/1 ports, but for some reason, they're not communicating. I'm doing this to physically extend my network and add ...
1
vote
3answers
3k views

Routing between two subnets using a Linux box with two NICs

I have a Linux box with two NICs, each connected to a different LAN: Network A: 192.168.1.0 255.255.255.0 Network B: 192.168.2.0 255.255.255.0 The routers are: 192.168.1.1 192.168.2.1 Linux NICs are ...
0
votes
0answers
17 views

Does Ubuntu with Linux 3.5 having TX RX ring buffers or BQL

My linux uname -a command outputs: Linux Davinci001 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux So, does NICs with this Ubuntu machine is ...