BGP announcements and small providers

Forrest W. Christian forrestc at
Thu Feb 27 00:51:24 UTC 1997


There are ways to use both numbers simulatenously.

Case in point, we have 3 sun boxes with IP addresses on their ethenet
ports of,131 & 132.  They used to be, 3, & 4.
Through the wonders of vif's and host routes BOTH IP numbers are still
reachable and usable for each box.  We had to do this because some of our
dialup customers (wich we are RENUMBERING to "dynamic") are still pointing
to 2 & 3 as thier DNS addresses.

BTW we havent't lost a customer.  The real trick is to only do it once.
DON't renumber until you can justify an /18 or so from the internic.  I'm
sure the internic will be more than willing to provide you with an /18 to
renumber into if you have close to an /18 of space in use.  Just buckle
down and say with your upstream until then.

- -forrestc at

On Wed, 26 Feb 1997, Justin W. Newton wrote:

> At 02:31 PM 2/26/97 -0500, Bradley Dunn wrote:
> >On Wed, 26 Feb 1997, Lyndon Levesley wrote:
> >
> >>  Nameservers are a bit harder to renumber, but that's not too bad.
> >
> >When you have hundreds of virtual web sites?
> Uhm, sure.  Just slowly decrease the TTL on your name server until you are
> ready to renumber (and the TTL is set to something ridiculously low such as
> 1 minute).  The customers will then experience something like a 1 minute
> outage when you renumber.  If we are going to start getting into the
> procedures of HOW to renumber this should likely move to the PIER mailing
> list.  I think if in general people become more interested in HOW to
> gracefully renumber themselves and their customers instead of worrying
> about how hard it is to do they would see that while it is work, it isn't
> really all that hard.  
> Justin Newton				
> Network Architect					
> Erol's Internet Services
> ISP/C Director at Large

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