[clug] For dyndns junkies

[Hal Ashburner]

I love this idea and being a part of it excites me, thanks!

My home ip is behind an isp nat. How do all of you recommend I ssh to a
server in my house via the vps with some known, public addressable IP?
ssh reverse proxy?



On 22 Aug. 2017 12:14 pm, "Bob Edwards via linux" <linux at lists.samba.org>
wrote:

> On 21/08/17 20:10, Andrew Janke via linux wrote:
>
>> #! /bin/sh
>>
>> IP=$(wget -O - http://icanhazip.com/ -o /dev/null)
>>
>>
>> So many good things available out there that I am yet to find.  This
>> one courtesy of:
>>
>>    https://github.com/AntonioCS/no-ip.com-bash-updater.git
>>
>>
>> a
>>
>>
> Of course, you can also run your own dyndns service, as I do as
> as sub-domain of my own domain, for multiple devices.
>
> (side-story: turns out that it is cheaper to hire a VPS in a
> data-center in Sydney, with a static IPv4 address, than it is to
> get a static IPv4 address on NBN...)
>
> In this case, I use an SSH forced-command on my publicly-facing
> server to run a script which uses the client IP(v4) address and
> nsupdate to update the bind DNS server.
>
> The client just does this (regularly, in a cron job):
> ssh -i <some key> -p $PORT $USER@$MY_DYNDNS_SERVICE nsupdate.sh
>
> and the server has this script (called from another script which
> does all the SSH sanity checking):
>
> #!/bin/bash
> # by Robert (Bob) Edwards, May 2017
>
> MYNAME="my-name.dyn.example.org"
> NSKEYFILE="/path/to/a_key.+157+24468.private"
> SERVER=1.2.3.4
> TTL=300
>
> read IPADDR OUTPORT INPORT <<< $SSH_CLIENT
>
> echo "IP address is $IPADDR"
>
> cat << EOF | nsupdate -k ${NSKEYFILE}
> server $SERVER
> update add $MYNAME $TTL A $IPADDR
> send
> quit
> EOF
>
> And one more comment: using VPNs means that I don't actually care
> that much anymore what my dynamic IP address is.
>
> cheers,
>
> Bob Edwards.
>
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