I was using the Google Stun server by IP 74.125.143.127, but since 21/09/2021 it seems Google changed the IP of DNS stun.l.google.com.
I know I should use DNS rather fixed IP.
Any guys have some confirmation about the IP change?
tks
I know I should use DNS rather fixed IP
Yes. That's the answer. Full stop. Don't hardcode IP addresses to services in your app. The whole point of DNS... well, you know this right?
Some recent DNS lookups:
stun.l.google.com: 74.125.197.127
stun1.l.google.com: 173.194.193.127
stun2.l.google.com: 172.253.112.127
stun3.l.google.com: 173.194.77.127
stun4.l.google.com: 172.217.215.127
Testing the old IP you referenced that's not in the DNS entries above:
>stunclient 74.125.143.127
Binding test: fail
Testing the IP address that's currently being returned:
>stunclient 173.194.193.127
Binding test: success
Local address: 192.168.1.18:55004
Mapped address: 1.2.3.4:55004
Related
I have got an authentication service. This service is behind an ingress (GKE in my case) for external API calls. When the signup function of the authentication service is called, it will send an email for email verification purpose. The link in this email has to point to the IP of ingress. In order to achieve that, my authentication service has to know the IP of the ingress. How can this be configured dynamically in k8s without storing the ingress IP[ address in a config file?
Many thanks in advance
Regards
Since by default GKE allocates ephemeral external IP address the simplest solution is to reserve static ip address. This can be done with new one or you can promote existing ephemeral IP to static one. With this solution the IP address is known in advance but the drawback of that the IP would have to be hardcoded into the application.
To avoid hardcoding this you could use nslookup to find ip address for this specific host. With this you should update your dns records with an address type record to point to you reserved static IP address. Please refer to your DNS service`s documentation on setting DNS A records to configure your domain name.
For more reading check how to configure static ip address.
The alternative way would be also to access the Kubernetes REST API directly and fetch the IP address from there. This depending on your architecture and application design will required appropriate authentication towards API.
Using cPanel WHM I have created a website hosting with Dedicated IP Address,
I'm planning to use it with the IP Address instead of a domain (e.g. http://1.2.3.4/script.php)
It opens, script also works fine.
The only issue is the IP address it uses isn't dedicated, it still uses server's shared IP.
I checked by CURL equivalent file_get_contents('http://myip.is') , the IP is the shared IP of server not the IP is use in URL or dedicated to it.
After a lot of tries, I realized the issue is because of CURL, apparently it still uses the server's main IP Address.
I managed to fixed this by adding the following to my CURL function
// Changing 1.2.3.4 with websites real IP
$website_ip = '1.2.3.4';
curl_setopt($curl, CURLOPT_INTERFACE, $website_ip);
I have a website. example.com
The website is hosted on bluehost
I would like to point a subdomain pediatri.example.com to another website hosted on another server (95.110.189.135:8080) the problem is that i can't CNAME to an ip with a port.
I tried using an SRV record like that:
I can't change the port to 80 on the other server, and i need the subdomain to point to the ip with the port and everything to work fine. Is there a way to do that? I appreciate every answer and comment. Thanks!
DNS only works at the IP Address level, its only concern is mapping domain names to IP Addresses, there is no way to specify a port number.
Srv records only work for applications that understand them and are specifically programmed to look them up and configure themselves accordingly.
So I am kind of new to networking and I'm just interested in the client/server architecture. Let's say you developed a program and the client version ran on a computer and the server version on the server(obviously). In order for the client to connect to the server, it would have to know the ip address of the server (and the port attached so it can be routed to the correct computer/program). Does that mean that the server's ip address can not change? Would you have to specifically tell your ISP to keep the ip address static? Because if both the client and server ip addresses change, then they would have no way to connect and the program wouldn't work... in other words there has to be one constant. When you sign up for a VPS do they give you a static ip address you can bind to from the client version? Thanks!
In order for the client to connect to the server, it would have to know the ip address of the server (and the port attached so it can be routed to the correct computer/program).
Correct.
Does that mean that the server's ip address can not change?
No. In fact, IPs can change at any time. Most servers that are exposed to the public Internet have a static domain name registered in the Internet's DNS system. A client asks DNS to resolve the desired domain name to its current IP address, and then the client can connect to it. But even in private LANs, most routers act as a local DNS server, allowing machines on the same network to discover each other's IP by machine name.
The OS typically handles DNS for you. A client can simply call gethostbyname() or prefferably getaddrinfo(), and the OS will perform DNS queries as needed on the client's behalf and return back the reported IP(s).
Would you have to specifically tell your ISP to keep the ip address static?
You can, but that usually costs extra. And it is not necessary if your server is registered in DNS. And there are free/cheap DNS systems that work with servers that do not have a static IP.
Because if both the client and server ip addresses change, then they would have no way to connect and the program wouldn't work...
That is where DNS comes into play.
in other words there has to be one constant.
A registered domain name that can be resolved by DNS.
When you sign up for a VPS do they give you a static ip address you can bind to from the client version?
It depends on the VPS service, but a more likely scenario would be you are assigned a static sub-domain within the VPS service's main domain. For example, myserver.thevps.com. Or, if you buy your own domain (which can be done very cheaply from any number of providers), you can usually link it to the DNS server operated by your VPS service.
Check this error and please help me.
2009-07-24 15:58:34.209 LBS[2636] Host 'staging.common.virtualearth.net' not found using 'gethostbyname()' - perhaps the hostname is wrong or networking is not set up on your machine
2009-07-24 15:58:34.209 LBS[2636] Attempt to lookup host entry for bad IP address (staging.common.virtualearth.net)
NOTE: you should run 'diskperf -y' to enable the disk statistics
I am running the objC codes for hitting a webservice on GNU for Windows.
Why is this error?
The first line says it can't find the IP address off the DNS servers.
The second is some kind of fallback with an incredibly cryptic error. Looks like it's trying reverse DNS using hostname as the IP address (hence bad IP address) or ARP resolution using hostname as IP address.
Basically fix the DNS to that host and both will be solved.