I have a modem which used for internet broadband and I got an IP address in the 'A' class 10.x.x.x and have netmask 255.255.255.255.
dhcpcd configuration so that each client gets the subnet mask 255.255.255.255?It means that your phone is using a point to point link. All your outgoing traffic will be routed to the other end of your link and nothing will be sent to the local network, which is unsurprising as there is no local network.
A network with a subnet mask of 255.255.255.255 puts each device inside its own subnet, forcing them to communicate with the router before communicating with any other device.
An address with a 255.255.255.255 may be one end of a PTP (point to point) tunnel. Check your routing table using a command like netstat -rn. You may see a route to another address from your IP. The other address should have a route to 0.0.0.0/0.0.0.0 (the default route).
You might have site site vpn . it will broadcast all interfaces on your roter and your route will decide where to forward the traffic on the remote site
If you are subnet mask such as 255.255.255.255 then your network ID and IP address will be same. Why... because SUB_NET_MASK and IP ADDRESS = NETWORK ID, so every device connected to the device will also get network ID as IP address. If A wants to send a message to B, then it will send it to the gateway first and afterwards to B. It's nothing but an end-to-end connection.
10.0.1.1 isn't an external IP, it's a LAN, VPS, etc (Hamachi is the main use of it) address. You need a non-LAN global ip address, your router should be doing this as it is your gateway, and you can have a internal IP like yours and still be on the internet, so this isn't your problem. What is your modem? What have you changed since you got it?
It probably means you're using PPPoE. PPP links are commonly created using 32-bit netmasks.
It doesn't affect your Internet connection in any measurable way.
That mask means host only address. It means you are on the end of a point-to-point link, and are not routed through.
