<div dir="ltr">thanks for the additional color - stuff that works tends to persist.<div><br></div><div>v</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Aug 8, 2015 at 11:08 AM, Leo Vegoda <span dir="ltr"><<a href="mailto:leo@vegoda.org" target="_blank">leo@vegoda.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 8 August 2015 at 03:05, Vint Cerf <<a href="mailto:vint@google.com">vint@google.com</a>> wrote:<br>
<br>
[...]<br>
<span class=""><br>
> The TCP/IP vs OSI battle lasted from 1978 to 1993. X.25 was around from 1976<br>
> to 2003 or so as I recall. I shut down the last MCI X.25 offering about 2003<br>
> or so if memory serves.<br>
<br>
</span>In 2007 I researched the status of each of the addresses in 14/8,<br>
which at that time was reserved for the gateways between x.25 and<br>
IPv4, as a part of reclaiming that /8. A large number of the addresses<br>
were still in use for a government network in Sweden (a labor<br>
exchange, I believe) and they were returned after the gateways were<br>
renumbered. Deutsche Telekom and BT were also still selling X.25<br>
circuits at that time.<br>
<br>
Looking at BT's current published pricing, I think they still sell<br>
X.25 circuits:<br>
<br>
<a href="https://www.bt.com/pricing/current/BT_IP_Networking_boo/0177_d0e8876.htm#0177-d0e8876" rel="noreferrer" target="_blank">https://www.bt.com/pricing/current/BT_IP_Networking_boo/0177_d0e8876.htm#0177-d0e8876</a><br>
<br>
I suppose people still use X.25 and the telcos at least cover their costs.<br>
<br>
REgards,<br>
<br>
Leo<br>
</blockquote></div><br></div>