Questions[dynamic-ip](ubuntu)

I want to be able to SSH to my home computer with lubuntu 18.04 from my tablet computer when I am not at home. I need this access to practice in programming when I cannot be in front of computer. I live at student apartment and ISP provides Ethernet connection to my room and I do not have any router. Alternatively I can connect to Internet by sharing Mobile data from phone. So I do not have dedicated IP on my computer.

All the instructions that I found in internet says that I must:

1. Install Open SSH server on my Ubuntu and open port 22- I have done that.
2. Get static domain from DNS service such as www.noip.net - I have done also that, now my lubuntu updates an ip to noip.net every 5 seconds.
3. Set port forwarding on the router - I cannot set port forwarding on router as I do not have any router in my scenario.

How to set SSH to my ubuntu if I do not have static IP neither a router at my place?

I would like to scp some large files from my lubuntu laptop to windows desktop. The ip address retrieved with ip -a command however only allows me connect from the laptop to itself. Router or modem is Technicolor tg558v, provider Carrytel (probably Bell reseller). Probably dynamic ip.

Workarounds that I am aware. I know I can buy a portable drive but would prefer a free solution. Fallback I am aware is Google Drive which is fine to pass smaller files (below 15G) or file chunks, but hope that scp or rsync could be faster/more convenient. Model/router is technicolor, both have wifi albeit slower than wired connection.

Draw of network is here. How can I configure Ubuntu server (A) to generate dynamic IP for new end points (like B) but C server should have static IP? (Firewall: A and C server accessible via SSH only by IPv4; C server has open ports 80 and 443 on IPv6)

I already have ddclient 3.8.2 working with OpenDNS. I'm running it on my laptop. I may travel with my laptop, and so I don't want to update the IP if I'm not home.

How do I restrict ddclient to update the IP only if I'm on my home network? This selectively has to be automated.

There are at least two ways to define whether I'm on my home network:

• Assume I use wifi, and that my home wifi SSID name is home-ssid. Assume I can configure this name.

• Alternatively, assume the MAC address of my router is F7:C1:A2:54:4F:71 (fake). Assume I can configure this value. This approach is intended to work for both wifi and/or wired.

If nothing else, a hack could be to use use=cmd instead of use=web in /etc/ddclient.conf. I can then potentially have the external command intelligently fail or return an unchanged IP if I'm not home. For this purpose, note that /var/cache/ddclient/ddclient.cache caches the last known IP.

Please provide a complete working solution.

I use ddclient to update my OpenDNS account for my home network (the router doesn't have this capability). Recently, I've been traveling and, at times, when my laptop joins another network it automatically updates that network's ip to my account (too bad for them, they're now having web filtering) and my home network loses it's OpenDNS filters.

So, is there a way to pause ddclient updates easily?