Questions about configuring, troubleshooting or using connections that one device uses to talk to another.

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68
votes
8answers
38k views

How to simulate slow internet connections on the mac

What's a good software solution to slow down internet connections on the mac for testing and simulations? My primary need is when testing code in the iPhone / iOS simulator, so slowing down the ...
43
votes
11answers
61k views

DNS not resolving on Mac OS

Some of my coworkers are having troubles on their Macs - DNS resolution does not work under Mac OS. They're running Snow Leopard 10.6.8. They can use DNS in a Windows 7 virtual machine (VMware Fusion ...
36
votes
3answers
29k views

How does the Mac choose which connection to use when both Wifi and Ethernet are connected?

When I'm connected to two networks with separate routers using Wifi and Ethernet, how does my Mac know what connection to use when I visit a website?
25
votes
12answers
8k views

Computer name keeps changing OSX 10.10 (14A389)

Since I upgraded to Yosemite 10.10 my computer name keeps changing adding a (2) and (3) and so forth. Any ideas how to fix this?
23
votes
6answers
4k views

How do I prevent document preview over slow connections?

Once in a while I have to work over a 3G network, which is reasonable, until I mount a file system on the other side of the world. When that happens OSX tries to show me "previews" of every single ...
21
votes
5answers
25k views

bandwidth shaper or bandwidth controller App for Mac OS X

I'm looking for a bandwidth/packet throttle/shaper program with the following features: Similar to Windows-based Netlimiter. GUI based and not terminal or command line. Shows list of all ...
19
votes
10answers
9k views

Why is the menu bar showing the VPN “Disconnecting” animation forever?

You know how when you disconnect from a VPN, you get a little scrolling "Disconnecting..." notification in the upper right notification area? Well, I'm getting that, but it never goes away. It's ...
19
votes
12answers
68k views

How can I save Google Maps in iOS for offline use?

Is there a way to retain a map with as much detail as possible (street view, maps, directions, zoom levels) offline? This question refers to the Apple maps program that shipped with iOS versions 1 ...
17
votes
6answers
227k views

How do I know the IP addresses of other computers in my network?

Say that I have two computers connected to the same network. I know that from computer1 and file sharing enabled I can snoop around inside computer2. But say that there is something interesting on ...
17
votes
3answers
876 views

Can anyone suggest strategies for coping with a 200MB/day Internet quota?

I have a satellite Internet connection (because I have no other choice, that's why :-) which has a quota of 200 MB per day (that is not a typo). As you can imagine, we can very easily go through that ...
16
votes
5answers
18k views

How to automatically login to captive portals on OS X?

How can I automatically login to captive portals on OS X? A captive portal is used by (often not password-protected) wireless networks that present a web page as soon as you connect to them, ...
15
votes
7answers
7k views

Start/stop internet sharing from a script?

Is there a way to start/stop internet sharing from the command line or maybe an apple script? The thing is that I move around my laptop between home and work. At one place I get wireless internet ...
14
votes
5answers
39k views

How to make Time Machine backups over network without OS X server?

At our institute, we have several Macs (from 10.6 to 10.8) but not one is running a server version. In the one running 10.8 there are 4.5 TB of hard-drives from which 2 x 2 TB are raided together ...
14
votes
8answers
33k views

How do I connect to a SOCKS Proxy from an iPhone/iPod Touch?

I like to surf securely and privately via a SOCKS proxy which I created via SSH tunneling, on the Mac. I used the SSH client on my Mac to achieve this. Then I thought, since the iPhone OS is ...
14
votes
6answers
42k views

How do I troubleshoot my Wi-Fi connection when an exclamation mark appears?

Sometimes, when I am in a public Wi-Fi an exclamation mark appears in the greyed out Wi-Fi icon. I can connect to the Wi-Fi (I get assigned an IP address), but I cannot establish an internet ...
13
votes
3answers
7k views

How can I “say” to another Mac?

I have two Macs in our house (iMac and MacBook Pro). I would like to use the say command-line utility to type something on my MPB and have it speak on the iMac, rather like an intercom system. Plus, ...
13
votes
3answers
19k views

How can I open port 80 so a non-root process can bind to it?

I want to run a web server on my Mac as a non-root process. Normally only root processes can bind to port 80 (or to any port below 1024). Can I open port 80 specifically so that non-root processes ...
12
votes
4answers
10k views

How can I quickly change DNS server

I often like to use a non-network specific DNS server (like Google's public DNS 8.8.8.8). However, many public wi-fi locations won't load their "terms of service, click here" page during the ...
12
votes
1answer
30k views

Should I block incoming connections from “netbiosd”?

My (application) firewall settings are configured to block incoming connections from netbiosd. I don't recall setting this myself, and wonder what the consequences are. What are the consequences of ...
12
votes
8answers
17k views

Can you prevent the iPhone browser from reloading pages?

I commute using the subway so this means 20 minute stretches of no internet. To give me something to do, I often open a bunch of web pages, say 3 or 4 before I'm offline so I can read them while I'm ...
12
votes
6answers
22k views

Differentiating Apple products by their MAC addresses

Apple has registered a ton of MAC address ranges for its products. Does anyone know whether it's feasible to reliably identify which Apple product (particularly iPad, iPod, iPhone, and MacBooks) a ...
11
votes
6answers
3k views

Why doesn't AirDrop work on older network adapters?

Apple has stated that AirDrop will support only the following models: AirDrop supports the following Mac models: MacBook Pro (Late 2008 or newer) MacBook Air (Late 2010 or newer) ...
11
votes
2answers
5k views

Reasons to prefer Little Snitch over the built-in firewall

Every now and then I browse through software you must have on your mac type lists and more often than not somebody mentions Little Snitch as a must-have application. Now what I think that many people ...
11
votes
3answers
8k views

Why does my Mac Pro have two ethernet ports on the back of the computer?

I'm curious as to how or why I might want to take advantage of two ethernet ports on the back of the tower?
11
votes
5answers
5k views

To let a Mac automatically use Wifi and Ethernet to double the connection speed?

I am staying at a hotel, and for some reason, I think they limit each Wifi connection to 95 kbyte / s. So that is roughly 1.2 Mbps... and since I have 18 Mbps at home, I am using a speed that is less ...
11
votes
4answers
8k views

How do I stop my computer name from automatically, and incorrectly, changing?

Ever since I upgraded my 2009 iMac to Mavericks, I often get a message stating 'The name of your computer "Foo" is already in use on this network. The name has been changed to "Foo (2)".'. The number ...
10
votes
5answers
24k views

How to find IP address of my other Mac?

I have two Macs on the same network, both plugged into my internet router. I have screen-sharing set up on one of them, so I can connect to it using command-K in the Finder with a vnc:// URL, and ...
10
votes
8answers
3k views

getting “out of memory” error when trying to load specific websites (am not out of RAM)

UPDATE: Rich's solution (with the checkmark) solved my problem! I also posted an answer with a workaround that may help if Rich's solution doesn't work for you. The answer that received the bounty was ...
10
votes
4answers
11k views

Stop Finder/OSX From creating TemporaryItems and .apdisk on Network shares

I'm looking for some way to configure OSX to prevent it creating .apdisk files and .TemporaryItems folders on network shares. These are created any time OSX accesses a shared folder on the network. ...
10
votes
3answers
595 views

Can the built-in OS X “Location” feature auto select locations based on wireless networks?

My home network is very secure, but my school's wireless network is open, which makes it vulnerable to wireless sniffing (e.g. with Firesheep). I just discovered the Location feature and I think it's ...
10
votes
2answers
412 views

In OS X is it possible to specify which network connection an app uses?

My ethernet connects to the LAN, my airport connects to a different network (it's another mac sharing a VPN connection). I want all apps except the iPhone Simulator to connect via the LAN. Is this ...
9
votes
2answers
6k views

Show Active Connections to “Internet Sharing”

How can I view a list of devices that are connected to my Apple laptop via Internet Sharing (when it's enabled)? If a list doesn't exist, does Internet Sharing log DHCP requests and if so, where? ...
9
votes
3answers
8k views

What does the dynamic global hostname option in sharing settings do?

Can anyone explain what this option does?
9
votes
2answers
3k views

Internet stops working frequently on OS X Lion

After upgrading to Lion, I started experiencing this issue: Internet stops working frequently. - I open Safari and browse for some time - Suddenly I can't open any sites; Internet will stop ...
9
votes
2answers
3k views

How to ensure that all traffic goes through VPN connection once it has been started?

I connect to the internet through a VPN provider along with other precautions in order to ensure privacy (against traffic analysis by agencies of a repressive government). I currently use Tunnelblick ...
8
votes
4answers
3k views

Remotely SSH to IP address in home network

I've got a device at home I want to SSH to from work. The device has port 22 open locally and I have port 22 opened on my AirPort Extreme. However, on the AirPort Extreme it says the open 22 port only ...
8
votes
3answers
536 views

Enable/disable Time Machine depending on network connection type

I've not got a great Wi-Fi setup here at home and it sometimes results in failed Time Machine backups. Is there a way of specifying that Time Machine only backs up under certain circumstances - i.e. ...
8
votes
3answers
4k views

ethtool Equivalent for OS X Lion

Other than ifconfig, is there an app/script for OS X Lion that produces similar output/info to ethtool? Specifically, I would like to be able to query the following: driver info online/offline ...
8
votes
4answers
25k views

What's a good iPhone app that will let me view files on my network?

I'm looking for an app which provides functionality similar to Apple Finder's "SHARED" feature, or Microsoft Windows Explorer's Network Neighborhood. Basically, I should be able to use my iPhone to ...
8
votes
3answers
7k views

My Mac mini's computer name keeps changing when it resumes from sleep

When I wake my Mac mini from sleep, it occasionally comes up with a dialog saying "The name of your computer "whatever" is already in use on this network. The name has been changed to "whatever (1)"" ...
8
votes
2answers
6k views

Workaround for Mavericks Bluetooth/Wi-Fi interference?

I have this problem: I normally have Bluetooth enabled so I can make use of my speaker system and Magic Trackpad on my mid-2012 11" MacBook Air (2.0 GHz i7, 8GB). However, when it's enabled, Wi-Fi ...
8
votes
1answer
5k views

How can I limit my download bandwidth?

Sometimes, I require a lot of bandwidth but do not want to disturb other's browsing experience. At the university I'm often connected to networks for multiple users which requires me to limit my ...
8
votes
3answers
4k views

network computers renamed after Yosemite install

Yosemite install (from Mavericks) has automatically changed the names of my network computers as shown in the Finder sidebar. For example, my name IMac now displays as my name iMac(2). My two ...
8
votes
3answers
17k views

How to monitor network traffic on a router from a Mac?

A company have a High Speed internet connection (30 MB/s) witch is enough for 10-15 computer. But for a week, there is almost no bandwidth "left" just taking the email take a long time or failed. ...
8
votes
1answer
2k views

How to set custom DNS entry for a particular wifi connection

Is there a way to set custom DNS settings for a single wifi connection without affecting other connections? I use my laptop at home and work. When at work I need to type in an IP address of a local ...
8
votes
1answer
5k views

Is it possible to configure OS X to use the domain-name supplied by DHCP option 15?

I run a small home network, and have configured my DHCP server to provide a domain name with all responses. My MacBook Air (running 10.7.3) places the provided domain in the DNS search path, but does ...
7
votes
2answers
25k views

How can I release and renew my DHCP lease from Terminal?

From the Terminal, how can I release and renew my DHCP lease? Currently, I'm doing the following for the wireless interface, but I'm wondering if there's a better way: sudo ifconfig en1 down sudo ...
7
votes
5answers
1k views

How can I tell which application is using the network?

Very occasionally when using my Mac, I notice my internet connection slowing down. Using Activity Monitor I can see that it's because something is downloading data at the full rate my connection can ...
7
votes
2answers
3k views

Turn Wifi Off via command line

I'm sharing my internet in work and forgot to turn it off! Does anyone know how I can do it via the command line? I have SSH access but thats it. D'oh.
7
votes
4answers
1k views

Can I use Dictation in OS X Mountain Lion offline?

There is a new feature in Mountain Lion, Dictation. When I try to enable it in the System Preferences, I get the following dialog: In other words, what Dictation does is just record your voice and ...