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

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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 ...
2
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36 views

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

I am writing software that allows for the configuration of parameters for authentication with a Primary and Secondary RADIUS server. Oh server administrators, in your experience, is it common or not ...
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1answer
32 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, ...
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0answers
36 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 ...
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2answers
39 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 ...
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16 views

Path throughput estimation with one cooperating host only [on hold]

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 ...
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1answer
27 views

Capacity Planning - Servers / Equipment vs Bandwidth [on hold]

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 ...
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0answers
13 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 ...
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0answers
19 views

Windows 8.1 third party firewalls and Hyper-V virtual switch compatibility [on hold]

I have the following problem: Hyper-V is installed on windows 8.1 with an external virtual switch. Everything works fine with windows firewall. When i try to install any third party firewall on ...
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2answers
48 views

Limiting IP access geographically

I don't want to cause any offence here, but whenever I take a look at the logs for my servers I can see I am constantly having IP addresses in China try to login to my machines, hoping to get access ...
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1answer
63 views

Restrict shared folder access to specific computer/IP [on hold]

How to configure a server [having DNS and ADS roles installed user account created/configured] to restrict its shared folder access to a specific computer in the network. Sol-1: Solution proposed ...
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17 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 ...
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41 views

Mystery IP address attached to Windows Server

While scanning my network I came across a mysterious IP address which shows no open ports but responds to pings. It is in the range of static IPs I reserve for servers. When checking arp table of PC ...
4
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1answer
39 views

Ping time variation correlates with IP phones not working

We have an IP Phone system (most models are snom 320). Today someone's phone has decided to stop working. It has an IP address assigned to it by DHCP, and I can sometimes go to it's IP address to view ...
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2answers
35 views

Use OpenVPN tun device for specific request

I have setup an OpenVPN connection with the route-nopull configuration. So now no special routes have been added to the client's configuration and only a TUN device is created, like so: tun0 ...
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46 views

Not getting ping My Local Network Domain xxx.local [on hold]

My Domain OS is Server 2008 r2 with DNS and we have 200 PCs in Different VLANs, Currently my domain PCs Network shows xxx.local(Unauthenticated) also some time DHCP not providing IP address to Client ...
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1answer
31 views

Windows redirect outgoing traffic

I need to redirect network traffic in a windows server which is destined to for example 111.111.111.111:100 to 222.222.222.222:100 This would be easy with iptables but cannot find any method how to ...
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22 views

How do I know the remaining buffer space?

There is a socket error 10055, meaning "No buffer space available". But what is this buffer space and how do I know, how much of it is still available? At the time I've got this error, the server had ...
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0answers
12 views

OpenWRT: Software update wget returns “Network is unreachable” [migrated]

I have OpenWRT [Barrier Breaker 14.07 / LuCI Trunk (0.12+svn-r10530)] installed on a TP-Link Wifi Extender (TL-WA850RE v1), though acting like a simple Access Point, DHCP & DNS are provided by a ...
9
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1answer
163 views

SSH tunneling is faster than OpenVPN, could it be?

Logically, VPN should be faster than SSH for tunneling, because: It's running on UDP and not TCP (so no TCP over TCP) It has compression However, today I tested Redis replication over both ...
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0answers
20 views

Want to block torrent traffic (p2p) & other unwanted sites [closed]

I have a Dlink 260E UTM & subscription IPS/IDS , WCF & antivirus.i want to know how to block P2P traffic on it & other unwanted sites by using IPS/IDS & WCF. I am new to this ...
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1answer
25 views

Common ethernet settings for UDP when bandwidth usage is high [on hold]

Suppose I have lot of servers which TX and RX lot of UDP traffic. Suppose I have 100 Mbps ethernet to use to TX or RX around 80 Mbps UDP traffic. And suppose I have 1 Gbps ethernet to use to TX or RX ...
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44 views

linux not replying to an arp request

I am running linux 3.14 on a system with 2 interfaces. on the first interface, i can access our local network. on the second interface, arp packets come in but linux doesn't send out reply. is it ...
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2answers
227 views

Should a NAS with multiple ethernet ports be split across network devices

I'm adding a Synology DS 1513+ NAS to a small business network. The NAS has four ethernet ports for data transfer. The current network configuration has a modem in bridge mode, hooked up to a ...
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2answers
21 views

Cisco PIX 501 and jumbo frames

We currently have a cisco pix 501 running in our office building and we just got word that our network is going to updated to run jumbo frames. I haven't been able to find much information, but from ...
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34 views

openvpn rdp networking mystery : can connect HTTP cannot RDP, even with firewall off

I have 2 small networks joined using OpenVpn (routed configuration), lets call them A and B. on A, I have a test web server (IIS, Windows 2008R2 or Windows 2012 depending on test machine), lets call ...
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1answer
18 views

How to scan mails with amavis from other mailserver

I have two postfix mail servers mailserver1 is running amavis to scan spam and virus mails mailserver2 is running without amavis. My question is how is the smartest way to use mailserver1 ...
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0answers
20 views

Equivalent to TYPE=“OVSPort” DEVICETYPE=“ovs” OVS_BRIDGE=br-ex in Ubuntu 14.04?

Is there an equivalent to TYPE="OVSPort" DEVICETYPE="ovs" OVS_BRIDGE=br-ex in Ubuntu 14.04? The system is OpenStack Icehouse with 3 nodes (controller, network, compute1) each on a VirtualBox Ubuntu ...
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0answers
12 views

Is virtualbox birdged adapter slower than NAT? [migrated]

I use samba server to share files between ubuntu and windows 7. The samba requires the Windows 7 and Ubuntu must be in same net section (eg. 192.168.0.108 and 192.168.0.125) in this way the samba ...
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34 views

DFSR speed Server 2008r2

So, here’s the simple setup: 2 sites, each with their own file server (server standard 2008r2 fully updated) 100MB WAN link at each site 1.7TB shared drive Replication schedule 64Mbps at night and ...
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1answer
21 views

is host id size of IP address will vary between the private and public networks? [duplicate]

I understood that size of host id in the class c network is 8 bits(1 Octet) Classful network After started exploring about private networks, in the below link Private network The host id size of ...
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20 views

how to setup a bridge on a server with the two NIC's to implement redundancy network [closed]

I have an ESXi host with 4 nics and 2 switches and I would like to setup a redundancy network. How can I setup a bridge on the 4 nics so I can connect 2 nics to each switch?
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1answer
51 views

Is this a switch loop?

I have a quesion regarding creating switch loops. I have 1 server with 2 network cards (nic1 and nic2) and 2 switches (sw1 and sw2) Question: Am I creating a switch loop if I connect nic1 to sw1 and ...
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1answer
14 views

Brocade FCX648-I In password recovery process

Brocade FCX648-I In password recovery process I get to a Monitor> prompt. The password recovery instructions tell me to assign a new password at this point but doesn't tell me how. There is a link to ...
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1answer
38 views

can't ssh into KVM VM despite using bridged network

I'm trying to access a KVM virtual machine running inside my company's network. I am VPN'ed into the network from my laptop and can ssh into other VMs, and I set up my VM to use a bridged network for ...
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2answers
35 views

Restrict SSH access to whitelist IP - what is stopping someone pretending to be from my IP? [closed]

I know I can whitelist a client IP for connecting to SSH on server and then Deny All other IPs. However, seeing as how the packet arriving at the server network interface must include the IP, what is ...
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0answers
63 views

Can I install an internet connection on a small town? What would I need? How much would it cost? [closed]

Here is the problem. 3,000 people with no internet or internet very slow. Here is what I want to do. Give them free or almost free internet based on how much money they make or have. Can I do it? ...
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0answers
35 views

syslogd is attached to a remote IP address

I have a hosted server and I have 3 VM's on the server. I did a netstat -antup and noticed this: tcp 0 0 192.168.0.15:37023 73.167.119.19:21333 ESTABLISHED 4039/syslogd Does this ...
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0answers
7 views

promisc mode doesnt work - better solution?

I have a Debian Wheezy server running snort with two network cards: eth0 and eth1. Eth0 is used to recieve a packet stream to inspect by snort - while eth1 is used by the admin to connect to the ...
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0answers
10 views

FailOver Ip configuration

i have got a new Ip from my provider un-configured one i have tried everything to configure it but nothing didn't work, when i ping it from the server it is working but when i try to ping it from my ...
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2answers
39 views

Disable all outbound network

I cannot seem to find any information on how to completely disable all networking. Essentially I want to flip the switch for any outbound or inbound networking. Like the wifi button on my computer, ...
2
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0answers
20 views

Device not accepting connections from a forwarded port. Security Issue?

I am forwarding a port through to a PLC/Management unit type device for a heatpump. The device accepts local connections from the LAN on port 80. It runs a normal web site on port 80 for management. ...
0
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0answers
33 views

Packet loss between windows guest and Ubuntu 14.04 host

We are seeing packet loss between one of our Ubuntu 14.04 hosts and a KVM guest running Windows 2008 R2. The loss only shows up at high loads. Similarly loaded machines running 12.04 do not exhibit ...
4
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0answers
58 views

Configure Juniper M320 as Ethernet/STM transparent converter

There is Juniper M320. We need to move ALL the traffic from one port to another. Everything that comes to one port goes to another and vice versa. No snooping or any other processing is required. One ...
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0answers
4 views

VPN Connection Over 3G [migrated]

I have a PPTP server running on my linux box, and i can successfully connect an android client to it using WiFi but when i try to connect to the server using data-connection (3G) it fails to connect. ...
0
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1answer
22 views

IPsec transport mode and MTU

[Similar to Right way to set the MTU of an IPsec Client (Linux/Racoon), but different in that there is no router on the responder side] I have a setup where machines in a local network need to talk ...
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1answer
60 views

Is ARP Connection oriented or connectionless?

Is ARP Connection oriented or connectionless? It uses TCP, but does that consider it connection oriented?
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1answer
36 views

Secondary IPs on DMZ machines not working

I am moving some virtual machines from my DMZ in a bladecenter over to my new cisco UCS. We are using Hyper-V, and are running Server 2012 on the old bladecenter, and Server 2012r2 on the new UCS. ...
3
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1answer
20 views

meaning of rx_queue_*_csum_err and rx_fifo_errors

I am trying to debug some networking issue with one server. I monitor this machine with multiple monitors and I see that at times ping error rate jumps to 5/10% I am running on ubuntu and I see that ...
2
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2answers
44 views

Assign multiple IP and Gateway in Ubuntu Server

I'm trying to find an option to add/assign multiple IP addresses and Gateways to the Ubuntu Server. The reason behind is, I want to access devices from two different networks. For instance I may want ...