For questions on connecting devices together so that they can communicate with each other, as well as on networking equipment such as routers and switches.

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1answer
65 views

Guest VM as firewall for other Guest VM

Maybe you can help me a bit. I am new to VM player.. I have Host - win 7 and two Guests on VM player. Kali Linux and Windows xp. I have troubles with setting network connections. Task is to create ...
0
votes
1answer
80 views

How to measure the transfer speed of an individual process?

One of the processes on our webserver that talks to an external email server is running really slowly. How can I find its transfer speed to/from the mail server? Needless to say I can’t just look at ...
0
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1answer
792 views

Why filtering on udp port in TCPDUMP gives only fragmented IP frames

I've a device capturing traffic with Tcpdump filtering on "upd dst port" then it creates a pcap file to be read in wireshark. what I obtain from running: tcpdump udp dst port 5201 -qUns 0 -i wlan0 -...
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1answer
2k views

Windows 7 - Connecting to PC on same network asking for username and password

I'm trying to connect to another PC on the same network so I can transfer files. I have been using the following tutorial http://windows.microsoft.com/en-gb/windows-vista/copy-files-to-another-...
2
votes
1answer
250 views

How can I add some static IP address at IPv6 for Windows 2012 DHCP server?

I would like to add some static IP address to my Windows 2012 DHCP server. I have tried to pair the IP address with its MAC address. At IPv4 it works, but how can do it at IPv6? Could anybody link a ...
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0answers
48 views

How can I access the internet connection on a windows machine via usb from a linux machine?

Suppose I have a laptop with a linux system with no internet connection, and a windows 7 pc connected to the internet. How can I use the internet connection of the pc on the laptop, connecting the ...
2
votes
1answer
33 views

Select default network card

I have a laptop connected to the internet via Wi-Fi. It is also connected to a private network via LAN. If the laptop is connected to both networks it doesn't have internet connection. How can I tell ...
0
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1answer
1k views

Configure VPN to access remote LAN network (Asus RT-AC66U)

I want to access a remote LAN network, without using this remote Internet connection when I browse websites for example. What I have so far is a working VPN connection (PPTP) but when I connect to it,...
0
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1answer
105 views

Linux: routing table - Gateway column: 0.0.0.0 vs *?

I have found SO question about What does 0.0.0.0 gateway mean in routing table? but this is not exactly what I want to know. I have noticed that in some outputs (e.g. here) of Linux route -n command ...
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2answers
325 views

How to connect to two PPPOE connections

I'm in a network that has to connect with a PPPOE connection to get internet access: I have two enhanced adapters in my computer with different IP addresses and two username and pass to connect with ....
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4answers
954 views

How to prevent computer from taking some IP address

Imagine you got a network to which other users can connect with their PC's, you have set up some rules, for example there is a DHCP server that gives addresses 192.168.2.100 - .254 and first 100 ...
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3answers
10k views

Windows 7 DNS not working (nslookup IS working; ping -4 name.com NOT working)

nslookup IS working; ping -4 name.com NOT working The most obvious symptom of this problem is that nslookup IS working, while ping -4 name.com is NOT working. That's because nslookup contains its ...
2
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0answers
73 views

Why broadcast ping takes longer than host ping

I have a simple question. I have read that when I'm pinging broadcast address in LAN every device responds to ICMP Echo Request and console shows first(quickest) response. But when I pinged ...
0
votes
1answer
51 views

How to configure multihomed computer to force internet requests over one of the adapters?

Here is the setup. Laptop is connected via ethernet adapter to a consumer grade wireless router. This router does not have a connection to the internet. It is local only and should stay that way ...
1
vote
1answer
350 views

I can't set up the following Netsh settings, because the object is already exist

I use the Netsh int ipv6 show int in terminal, the result: 1 50 4294967295 connected Loopback Pseudo-Interface 1 11 10 1500 connected Local connection When I wanted to use the ...
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2answers
233 views

Bonding 3 10mbps adsl lines with a mikrotik

How do I get it right cause it uses all three lines for upload , but only uses two for download ? Please help Pieter
2
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0answers
223 views

Proper network architecture for fault tolerant multi WAN multi building WLAN setup

I need help with deciding the correct network architecture for a guest WLAN deployment. We have 3 buildings, and each of them has its own LTE router (Mikrotik RB411U) connected to an Ubiquiti ...
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0answers
11 views

What “device” represents between socket and network

Here is a question and an answer: How many times is the data in a message copied from a user process creating it to it being sent onto the network? Answer: two times The data is copied once from ...
0
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2answers
72 views

Is there such a thing as a double ethernet cable?

I have a cable modem in the living room. I have ethernet running out of the cable modem to an Apple Airplay, then back out of the Airplay to a 4 port switch so that I can hardwire all my consoles. I ...
1
vote
1answer
634 views

Confusion about the `conntrack` extension of `iptables`

The iptables-extensions manpage has this to say about the conntrack extension (emphasis mine): This module, when combined with connection tracking, allows access to the connection tracking state ...
2
votes
0answers
181 views

What are These Outbound Network Rules

I Have a few odd looking network outbound rules for my computer they are Name Group Application Package f5.vpn.client f5.vpn.client ...
1
vote
3answers
317 views

Can you assign different default gateways on a per-application basis in Windows 7?

I have two internet connections (one satellite and one DSL). I want to route all my gaming traffic through the DSL connection and all other traffic through satellite. Each WAN is served from its own ...
2
votes
1answer
1k views

http://localhost:3000 works, but http://127.0.0.1:3000 doesn't

I'm building a Rails application on my local dev machine. When running my local server, I can access http://localhost:3000 without a problem. However, when I try to navigate to http://127.0.0.1:3000, ...
0
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0answers
52 views

Strange intermittent lag phenomenon over wireless LAN

I'm connecting to computer Y on my wireless LAN at home. Y is a newly-assembled machine running Kubuntu 14.04; it's wireless adapter is "Realtek RTL8192CE PCIe (rev 01)". Between other machines on the ...
0
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1answer
19 views

SNMP read only risk of enabling

We are currently thinking of enabling SNMP read on our routers and switches. What are the risk of doing so. If the read mode is compromised how much damge could we be expecting.
1
vote
1answer
257 views

Make traffic go one-way by using iptables

I have a network topology: [C1] - [R1] - [R2] - [C2] C1-R1 network is 192.168.100.0/24 R1-R2 network is 10.9.8.0/30 R2-C2 network is 192.168.200.0/24 What I need to do is to make C2 be able to ...
0
votes
1answer
110 views

Forwarding requests to my external IP to a different IP

When I connect to my external IP in linux, it gets forwarded to my gateway (router). But I need to run a server, so I need to be able to forward requests to my external IP to my computers ip address. ...
0
votes
2answers
189 views

Wrong IP address present when connecting from localhost to localhost

I have a Linux server with Ubuntu installed on it. When I connecting to some service (MySQL, apache, icecast for example) from the same machine at address 127.0.0.1, they all show that I connected ...
0
votes
1answer
78 views

Where do port knocking services listen for incoming knocks?

I'm trying to understand how a port-knocking daemon is able to monitor for knocks, independent of the firewall rules (e.g. accept/drop/reject packets). I've installed knockd, which listens for lets ...
3
votes
1answer
57 views

Lan printing issue HP 8600 pro

I'm having random issues with lan printing. Network composition: 2 PCs (Windows 8) are connected by Ethernet 2 Macs (10.9 & 10.10) are connected by Wi-Fi 1 PC (Windows 8) is connected by Wi-Fi ...
1
vote
1answer
339 views

Why does IE resolve https://localhost but Firefox does not?

We're running Windows 8.1 with the current stable Firefox and IE. There's a fresh installation of Apache 2.2 that has been enabled to do SSL. http://localhost is reachable in Firefox and IE and ...
0
votes
1answer
68 views

Sawtooth shaped ping

I moved to a new place and over here, I'm getting much worse internet speeds than I should. It was ok for the first day, around 40-60Mbps but the second and third day it dropped to 5-6ish, every now ...
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6answers
926 views

Disable internet connection permanently windows 8.1 [closed]

I have used "Ipconfig/release" command to disable internet but it allows to connect to internet after I restart my PC. Is there anyway to disable internet permanently, and a method to restore it ...
1
vote
0answers
33 views

Check network speed

Is there a way to check that my network is alternating between the routers to the Internet? I wasn't the one that set up our network. Physically I can see that we have one phone line into the our ...
11
votes
3answers
11k views

What other IP addresses can/should I use for my home network?

I've been using 192.168.1.x for my home network, which has been perfectly happy for quite some time. However, I just started a new job, and they use the same set of IP addresses when I connect over ...
2
votes
0answers
877 views

Disabling/Unbinding IPv6 on a specific network adapter without UI

My problem is similar to the one described in http://serverfault.com/questions/257118/how-to-disable-ipv6-on-a-particular-network-interface-using-server-core - just on Windows 7. The answers seemed ...
1
vote
1answer
101 views

IPv6 global address lost after delay

I have a (gentoo linux) computer behind a home router (Fritz!Box 7360). When I initially connect it via a wired connection, it is assigned a link-local address (fe80:...), a unique local address (fd00:...
1
vote
1answer
74 views

Why is only 127.0.0.1 considered as a loopback when anything from 127.0.0.0/8 is routed to localhost?

In every network tutorial/reference that I've seen is as a loopback considered only 127.0.0.1 IP address. I've tried to ping any random address from 127.0.0.0/8 and it also routed me to localhost. Are ...
0
votes
2answers
244 views

Cannot connect to WiFi network on Windows 8 / 8.1

I see about 12 other WiFi networks in the WiFi list displayed by Windows and can even connect to them (one of them I know), so WiFi is basically working. However, I cannot find the network I usually ...
0
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0answers
31 views

Why do I need a loopback adapter on the target hosts of a Virtual IP?

I recently ran into a problem involving virtual IPs for the first time. The virtual IP targets two different (as far as I can tell, physical) hosts. The hosts are linux, but I don't know what software ...
1
vote
0answers
78 views

Wamp, Route External IP to one file and Internal IP and Localhost to Wamp HomePage

So I recently downloaded WampServer and was wondering if there would be away for me to be able to route my external IP address and my internal IP address, along with Localhost, to separate locations. ...
1
vote
1answer
110 views

Dns: results of dig of domain.com with and without www

I ran dig against a certain domain which I own, say for example domain.com. After executing dig domain.com, I obtained results like the following: ;; ANSWER SECTION: domain.com. 21600 IN A x....
1
vote
1answer
281 views

Why can't the VMs in my pen-testing lab ping each other?

I have setup Kali Linux and Windows XP in Virtual Box. My first problem is, these two systems are not being able to ping each other. Second is, they are not being able to connect to the Internet (...
0
votes
0answers
32 views

Cmd cannot find a mapped drive

Here's my problem: we have a network drive that's mapped to T:\, and it's pointing to \\somecomputer\somefolder\. We can run: \\somecomputer\somefolder\someapp.exe from cmd. We can also run pushd \\...
0
votes
2answers
86 views

What type of connector is on this NAS-like storage device?

I have a NAS kind of box, which I got it from my old office when they were moving out, at first I thought this was a simple Ethernet cable, but it is not. Any idea what this connection is? Another ...
0
votes
4answers
378 views

Why Telnet protocol uses only 1 port on server while FTP uses 2 ports

I got this question in a job interview and I had no idea what to answer. Can someone please help me understand it? Why does telnet protocol use only 1 port while the FTP protocol uses 2 ports on the ...
0
votes
1answer
1k views

Accessing APC Smart UPS Network Management Card via hostname

I've got a new APC SmartUPS X 1500 with the build-in network management card AP9631, which I can access it via the ip-address 192.168.0.154. This IP-address has been given by my router's DHCP. When ...
2
votes
1answer
192 views

tun interface not working in ubuntu14.4?

I have problem making the tun interface on Ubuntu 14.04 work correctly. The commands lsmod | grep tun and sudo modprobe tun return nothing. Even the module, tun.ko.gz in /lib/modules/ and ...
1
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0answers
1k views

Monitor who's connecting to your wifi connection on Kali Linux [closed]

I'm wondering if there's a software/tool which can manage the accesses to my wi-fi connection. I'm using the modem dashboard now, but it's slow and complex, as it's not direct as a software and I ...
1
vote
0answers
22 views

How to access a server on VMware from the web? [duplicate]

Here's what I have done: I set up an apache server on Ubuntu in VMware. I used the NAT config. I set up port forwarding. Now on the host machine, I can access the server using localhost. It ...