I like to change DNS address of iPhone through my application. Is it possible ? Any one let me know how i can do it, it will be very helpful. Thanks in advance.
If by DNS address you mean the IP address of the DNS server the iPhone uses for queries to resolve the domain name you provide, then it is not possible in a non-jailbreaked device. The IP address of the DNS server is provided to the iPhone through DHCP. So you would therefore have to change the DHCP settings in the setup of the network you connect to, eg. the Wifi access point.
If you want to change the IP address assigned to the iPhone (and possibly provided to other devices through DNS) then again you would have to modify the DHCP settings on your server. This IP address is provided to the iPhone through DHCP and possibly coordinated with the DNS server in the network.
Unfortunately it's not possible from an app. Oh, and I believe you mean IP address, right?
there was a trick to reset an ip address by turning airplane mode on and off, but the ip address is assigned to you by the network you are connecting to. In the apps you don't have a way to request a "reset" like this. this is done on the system level and not exposed as a method an app can use
google up netinfo+ its an app for setting dns on iphone
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I try to find the IP adresse of a Raspberry PI (LINUX) that is connected to the same Network as the iOS device my code is running on.
Is there some way to "find all" ip adress in the network the device is currently joined via SWIFT?
If you ping the broadcast address, unless devices are specifically configured not to replay, they will do so. How you do that with Swift is another question.
This question+answer will work if you know your IP address, you need to probe all the probable addresses of course.
How to check Internet is working or not in ios
Sorry if I have this in the wrong community but I'm hoping one of you can help me out anyway.
I have a web hosting account with a UK company who I'm happy with, but I'd like to set up a little hosting account from my laptop, just to see if it's possible and easy enough to do really.
Trouble is I've been doing a lot of research online but coming up empty whenit comes to more of a "complete guide". Do any of you know of a good resource for setting up a home server for publishing "Live" websites with custom TLD domain names? I have a localhost server running and files hosted on there but I'm really looking for help with the IP and DNS parts for the custom domains.
For reference, I have a machine running Win7, Appserv 2.5.10, UK broadband and a .co.uk domain name registered with 123-reg.
Any help would be hugely appreciated.
You'll need to:
Point your domain to your laptop.
If you get static public IP address from your ISP, then you can just point the A record to this IP address.
Where do I set this A record? Almost all domain registrars give you a nameserver for free. You point your domain to their nameservers (generally ns1.somedomain.com and ns2.samedomain.com etc.). In the nameserver config, create a A (stands for authoritative) record and put in your static IP address.
What if my ISP doesn't give me an static IP address? This is where services like dyndns come into picture. They give you an agent that you'll install on your laptop, it detects the change in IP address and automatically updates the Nameservers accordingly. There are some free variants of dyndns as well if you don't want to spend money on this.
But my laptops IP address is something like 192.168.x.x and my site runs on localhost (127.0.0.1)? Your laptop is most likely NATed. Think about your public IP address to be that of your router. You will need to forward any connection coming to your router on port 80 or 443 to your laptop's (192.168.x.x) corresponding ports. This is called Port-Forwarding and all routers support this. Port-Forwarding is done by logging on to the admin interface of your router (Many times its at http://192.168.0.1 or http://192.168.1.1).
But again my application is accessible at localhost? You need to make sure your apache/nginx listens on 0.0.0.0 or atleast 192.168.x.x interface. This is how computers outside your laptop will be able to make connection to your laptop on port 80/443.
I am not expert on this subject, need your suggestions. I have a few devices on ethernet/LAN. I wanted to have these devices communicate over LAN without going into their network configurations. Below is my plan, please let me know if this can be achievable:
1) I install TCP/IP stack on these devices
2) I give them their hostnames like device1, device 2 etc....
3) I configure these devices for local-link networking, so that they can configure themselves and get their IPs.
4) I use socket programming and access each device by using hostnames.
Please let me know if this can be done without much hassle, and let me know if I have missed out something in above mentioned points.
Thanks in advance.
This is basically a good approach.
If your embedded devices have a good IPv6 stack, I recommend using it instead of IPv4. link local addresses work better with IPv6. Most IPv4 stacks are configured to try to obtain an address from a DHCP server first, and only fall back to link local addresses if they can't get one. The link local address and DHCP address might be mutually exclusive, so the link local address doesn't become operational until after DHCP has been tried and timed out. The link local address might even be disrupted if DHCP periodically retries. Although the devices will normally be connected to each other and there won't be a DHCP server, you don't want to disable DHCP, because the devices probably should obtain a DHCP address if they are ever connected to a wider network. With IPv6 on the other hand, the link local addresses come up immediately when the interface comes up, and stay up continuously while other IP addresses (from autoconf or from DHCPv6) may come and go.
Link local addresses alone won't let the devices contact each other by hostname, but dns-sd (mDNS, zeroconf) will. If you are using Linux then you can use avahi as a dns-sd stack.
Better than using hostnames, consider having the devices probe for each other by dns-sd service type. If you are using a custom protocol between your devices, make up a unique service tpe name and have the devices advertise themselves it and probe for it with dns-sd.
For my development process I need to access a webserver which is behind a VPN and has no DNS entry.
What I was doing on 4.x was to edit /etc/hosts on the iPhone, and add it to the hosts file.
Now I'm on 5.0 beta, and don't want to jailbreak for now just for this purpose.
Is there a way I can add a line to /etc/hosts, just for development purposes (the final, distribution application does not need this hack), without jailbreaking? Can I use other means (declare a fake DNS entry by some unknown means at application launch, for example)?
EDIT: If you're willing to purchase a small license, I recommend using Charles Proxy, a web debugging proxy tool. It will also resolve domains from your local /etc/hosts, and it gives a lot of bonus features (i.e. inspect requests/responses and throttle network speeds). I only stumbled upon this tool from a WWDC video and I'm not affiliated with the product at all. I recommend reading Chris Ching's tutorial for iPhone and Charles Proxy to get you started.
To add to Ramon's answer, a way around it is to setup your local computer as a DNS server and have your iPhone point to your computer as a DNS server. This would also work for Android devices as well
The instructions are for Mac OSX via Homebrew:
brew install dnsmasq
dnsmasq is a lightweight dns server that will fallback to the original DNS server when it encounters an unknown domain
Add the line address=/.your.domain.com/10.0.0.5 to the file /usr/local/etc/dnsmasq.conf
The IP Address 10.0.0.5 is whatever the IP address assigned to your local computer by your router. You can find this via Network Utility (if you want to be fancy, you can assign a static IP to your local computer in your router)
sudo dnsmasq
This starts dnsmasq process, and it will listen on the DNS ports
Assign your local computer and your router as your DNS servers for your computer via System Preferences -> Network -> Advanced -> DNS Tab
You'll have two entries, one for your local computer (127.0.0.1) and one for your router. The reason why you include your router's IP is dnsmasq will fulfill unknown entries through the other known DNS servers. Without the router entry, you're whatever devices connected to you dnsmasq won't know how to connect to the internet.
Set your local computer's IP Address as your DNS Server your iPhone, go to Settings -> Wi-Fi -> Info icon for your connected router -> DNS
Some things to consider:
If you shut down your machine, your iPhone won't connect to the internet anymore. Make sure to reset your iPhone's DNS server to your router's IP
By default dnsmasq will look at your /etc/hosts, so if you had pointed your.domain.com to 127.0.0.1, your iPhone will resolve your.domain.com to 127.0.0.1, which means you won't connect to anything. To change this behaviour edit uncomment the #no-hosts line in the dnsmasq config.
Sources
http://www.davesouth.org/stories/how-to-set-up-dnsmasq-on-snow-leopard-for-local-wildcard-domains
Set up a real DNS entry, either by setting up a local DNS server on your wireless network, or by using a dynamic DNS service, or by adding an A record to a domain you control DNS for.
You can also set up dnsmasq (available from macports/brew), it acts as a DNS forwarder which allows you to set all kinds of alternative records.
You can then set up the DNS on the iphone/ipad to point to the box running DNSmasq, and any host on /etc/hosts on the dnsmasq box will be returned first. If not found, dnsmasq will send the query to the upstream DNS.
Also you can add SRV records to dnsmasq.conf:
srv-host=_sip._udp.devel.foo.com,devel.foo.com,5070
And many other niceties.
I have been looking for the answer to this question for some time. I am doing network programming for the iPhone and it is necessary for me to use the IP address of the device. This isn't a problem on the physical device as it has its own IP address on the network. However I was wondering what was the case with it on the simulator. Does it get assigned an IP address to be used?
The ip address of the machine you are running it on
should be 127.0.0.1