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Clients are connecting to private servers using OpenVPN, currently using raw IPs (172.X.X.X) but I would like to point more user-friendly subdomains (something.ourdomain.com) to those private IPs
Key is to
Not make our private topology public, so binding subdomains to a public DNS is not an option
Be able to push new settings to all clients efficiently, so modifying local hosts-files whenever a private IP updates could potentially be cumbersome
Not tie the routing to a specific local hardware, so doing the routing on say e.g. our office router is not really an option
Any suggestions how to achieve this considering the above points? Set-up a private DNS? Do the routing in OpenVPN?
1) Set-up private DNS server(s)
2) Push DNS server to your OpenVPN clients by addding
push "dhcp-option DNS 172.X.X.X"
to your OpenVPN server configuration (where 172.X.X.X is private IP address of your DNS server)
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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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I am trying to connect 2 virtual machines on the same host. Basically trying to ping from one to another. How can it be done if both have same IP address?
edit:
I am currently using hping3 to learn about Denial of service Syn flood. So can the 2 VMs be used for this?
If they share the same IP address this isn't possible. Ping uses ICMP echo requests and replies and ICMP doesn't use ports that could be NATted to different machine.
You'll need to bridge the vNIC to the local network so each VM gets a different IP. Alternatively, you could connect both to an internal, entirely virtual network - depending on what the hypervisor can be configured to do.
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Closed 8 years ago.
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I am new to networking concepts. i know the basics of public and private ip. If two systems are in different LAN and i want to connect to one system from other and i need to send data. I've already tried with command line search, it will give only the private ip? Even if i know the public ip, how can i specify my destination system (there could be more than one system coming under the same public ip right?)
You have to configure on router or firewall of the network where the ftp server is a NAT or a PAT, in order to map a public IP address to the private address that you obtain with the netstat command.
Over than this you have to configure firewall rules on the network of the ftp server to allow inbound ftp connection to the public ip address. You can restrict this connection for the public ip used by the client.
In the network where the client is, you have to allow the client to estabilish ftp connection with the public ip address of the ftp server. You have to do it on the firewall or the router of the client network.
It is not possible to give you more details about it, the detailed implementation depends on your network topology and network devices.
Regards
Giova
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I'm using a pfSense router and I'm desperately trying to configure a custom url (eg: myurl.ext) that should mapped by pfSense to a local server (eg: 192.168.0.x).
Like I do with my /etc/hosts and creating a line myurl.ext 192.168.0.x but on the pfSense level to do that for every device that should connect on the same network.
How could I achieve so? What is a name of what I am trying to do ? (DNS forwarding, Host override, dnsmasq, NAT....)
Found that by myself some time ago.
I used "DNS forwarder" service, and added custom host overriding and redirected to a specific machine with its IP.
(used address=/domain.ext/192.168.0.42 in advanced config in DNS forwarding service)