# telnet mx2.ipoac.nl 25 -4
Trying 86.80.166.233...
telnet: Unable to connect to remote host: Network is unreachable
# telnet mx2.ipoac.nl 25 -6
Trying 2a02:a46f:95b7::1...
Connected to mx2.ipoac.nl.
220 mx2.ipoac.nl ESMTP Postfix
Just amazing that my cable #isp #ziggo blocks tcp dport 25 outbound over #ipv4, but #ipv6 is fine apparently.
Still not very useful with a fixed reverse #DNS that ends in cable.dynamic.v6.ziggo.nl that #spamfilters seem to love.
Not the kind of thing that you'd buy to run your little server, but the kind of thing to hoard on and use as the aluminum foil to wrap and back your corporate bonds.
Just when you think that the enshittification of our industry can't get any worse, here you go with news of somebody creating money out of thin air backed by IP addresses.
https://tech.slashdot.org/story/24/05/04/2122251/multinational-isp-offers-206m-in-secured-notes-backed-by-ipv4-addresses#
Guess, I spoilered something for #BoxyBSD now.
#illumos #solaris #opensolaris
@gyptazy I tried to migrate home network to #IPv6 until I traveled to #Finland : the #WiFi guest and my mobile operator were stuck on #IPv4. I cannot connect to my home server through #WireGuard (IPv6 only).
Then I re-enabled dual stack when I came back home 😅
My issue was not caused by a Finnish issue, except about WiFi connection. The root cause is that mobile operator provides only IPv4 on roaming.
@gyptazy I tried it with a couple of jails last year and it was a sad mess. I couldn't clone github repos and downloading certain things just didn't work but I found ways around it.
Then I went on a trip through multiple countries and it became an even bigger mess, because often I only had #IPv4 available and couldn't directly reach the services I had set up.
Sure, technically everything works fine on operating systems like #FreeBSD, #OpenBSD, #Debian, #Fedora etc. and all my monitoring, backup and admin infrastructure is #IPv6 only for years. But dealing with clients is something different. I think most clients already support #DualStack, especially within my circle but it could still be annoying for people that are forced to use #IPv4 only.
Sure, technically everything works fine on operating systems like #FreeBSD, #OpenBSD, #Debian, #Fedora etc. and all my monitoring, backup and admin infrastructure is #IPv6 only for years. But dealing with clients is something different. I think most clients already support #DualStack, especially within my circle but it could still be annoying for people that are forced to use #IPv4 only.
