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I understand that the job of IP in the TCP stack, when dealing with an outgoing message, is to resolve an IP address from a host name and add this address as a header.
Is this process that IP goes through equivalent to using a tool like nslookup for a given hostname?
Your understanding is incorrect. IP doesn't know anything about device names, it only deals with IP addresses.
An application can query a DNS server or a hosts file to resolve a name into an IP address. This must be done prior to using IP to forward a packet since IP can only use an IP address. Tools, like you mention, and other applications, such as browsers, query a DNS server (requires you have the IP address of a DNS server configured) or use a hosts file to resolve the name to an IP address.
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Suppose there is an IPv4 over IPv6 network, and a client inside an IPv4 subnet wants to access a server that has both IPv6 and IPv4 addresses. However, the client only knows that it is in an IPv4 network and not an IPv6-supported network. So when the client resolves the server's hostname, it receives an IPv4 address from the +A record(Because it should specify the query-type as +A). How can the client use this IPv4 address to access the server via the IPv6-only network, considering that the subnet accesses the public network via an IPv6 router that only has a public IPv6 address?
I ask the question to chatgpt, but it didn't response a clear answer.
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The website is reachable by host name but not by the ip adress specified in the A record. The DNS successfully resolves the request to the same ip specified in the A record.
Postman tells me: Error: Hostname/IP does not match certificate's altnames: IP: [...] is not in the cert's list.
Background: I have connected a Firebase application with a existing Domain. Firebase has generated a certificate for this website.
There are not enough IP addresses for all web sites to have a unique IP address. Firebase Hosting makes everyone's sites share the same IP address, and is able to distinguish requests for sites using the HTTP Host header from each request. This means the Host header is required. Postman will add that for you automatically if you use the domain name of your site, but it would have no idea what to use if you just provide an IP address.
See also: What is http host header?
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When my PC is connected to Network, I will be getting couple of IP address.
1.) Modem Private IP address (will be like 192.168.1.3)
2.) ISP address (by searching "My ip address" in google it gives me my global IP address)
My roommate who is connected to same modem is able to ping my global IP address but not other person who is connected to different network, why??
Is there anyway that in ISP they block ICMP Packets?? So that no one be able to ping other machine ?? or do they use different routing instances for different sectors??
If we want a global IP address for my PC so that anyone can login/ping what should I enable??
Your router/modem gets a dynamic IP from ISP whenever you connect it to Internet. This address as name says is changing. If you want a constant public IP from ISP, you must request ISP for the same. This comes at a very high cost and not recommended unless you are serving a high revenue generating data on that machine.
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We are running a Java based web-application, and were in the process of updating the site from http:// to https:// (by installing SSL cert),but encountered issues with bringing the site online.
On further analysis, we found that the port 443 was being blocked, which was preventing this site from being accessible on https://
We informed the same to the Network team, to open firewall on port 443. But the problem is, they keep coming back asking for the destination port.
We provided the source IP (IP of the application server)...what would be the destination IP (is there a specific destination IP if a site needs to be accessible on https://) ????
My question is, what would be the destination port, to open firewall to make a site accessible on https:// ??
Most likely they want to setup NAT so that incoming requests coming to NAT:443 are routed to :443 , and for this they do need an IP of the server within the local network.
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Closed 7 years ago.
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I have a Windows 2008R2.
On a NIC, I have 3 ip aliases :
- two have the same subnet and it works well
- the third is on a different subnet
I can ping the third ip.
I can see the packets who are coming on this ip with Wireshark.
I have a service who list on the 0.0.0.0 address.
When I try to connect to this service, it is like the packet are not going to the service.
I tried with netcat also in listen mode and I had the same problem (If I connect via the loopback ip, netcat receive my datas...)
Is the ip aliases have to be on the same subnet on the same nic ?
Thanks in advance
Best regards
This will never work. I tried with an additionnal nic and it worked