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<TITLE>/24 assignments to multi-homed customers who can't justify the use of >126 hosts in 3-6 months</TITLE>
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<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001>Hi,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=538143418-15032001>I
received some informative responses from members of this list regarding the
initial message I sent (see below). Could someone from ARIN please respond with
your thoughts on this matter?</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=538143418-15032001>I sent
email directly to ARIN and also phoned the registration help desk. In both
situations I was informed that ARIN does not allocate or allow others to
allocate netblocks based on routing needs.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=538143418-15032001>As far
as I see it, for the Internet community as a whole, there are two
solutions:</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=538143418-15032001>1)
ARIN needs to change its policy to accommodate institutions that have a need to
be multi-homed, or,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=538143418-15032001>2)
ISPs need to modify their routing policies to allow advertisements longer than a
/24.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=538143418-15032001>In my
opinion, the most viable solution is the first one mentioned above. In order to
implement solution #2, you'd have to get all of the ISPs that are out there to
change their routing policies. This is much more difficult than having one
organization (ARIN) make the change.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=538143418-15032001>The
additional problem with solution #2 is: if ISPs change their routing policies to
allow advertisements longer than a /24, can their routers accommodate the
increased size of the Internet routing table? Probably not, since that is why
the /24 policies are in place.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=538143418-15032001>Of
course, the main problem with solution #1 is that certain netblocks will be
inefficiently allocated. However, most customers that are multi-homed typically
have enough hosts to require a /24 netblock or larger, so in all likelihood,
there probably won't be many institutions that can't justify a /24 but need to
be multi-homed.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=538143418-15032001>It
would be interesting if ARIN could share the number of ASNs that have been
registered within the last year. Based on my experience over the last 2 years
installing BGP customers at ISPs, I would estimate that, at the very high end,
10% of institutions that aim to be multi-homed will require a larger netblock
than they can justify in order to accommodate those routing needs. If the
appropriate parties at ARIN could project the number of ASNs that will be
registered over the next few years.. you could calculate how many networks/IPs
will be inefficiently allocated and see what sort of impact a policy change
would have.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=538143418-15032001>Thanks,</SPAN></FONT></DIV>
<P><FONT face=Arial size=2>Jon Foreman</FONT> <BR><FONT face=Arial size=2>BBO
-</FONT> <FONT face=Arial size=2>Service Activation Engineer</FONT> <BR><FONT
face=Arial size=2>jforeman@bbo.com</FONT> <BR><FONT face=Arial size=2>Desk:
703.641.6451</FONT> <BR><FONT face=Arial size=2>Mobile: 703.403.4263</FONT>
<BR><FONT face=Arial size=2>Pager: 7034034263@message.bam.com</FONT> </P>
<BLOCKQUOTE
style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">
<DIV align=left class=OutlookMessageHeader dir=ltr><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> jforeman@bbo.com
[mailto:jforeman@bbo.com]<BR><B>Sent:</B> Friday, March 09, 2001 2:35
PM<BR><B>To:</B> ppml@arin.net<BR><B>Subject:</B> /24 assignments to
multi-homed customers who can't justify the us e of >126 hosts in 3-6
months<BR><BR></DIV></FONT>
<P><FONT face=Arial size=2>All,</FONT> </P>
<P><FONT face=Arial size=2>For a customer of an ISP that meets the following
criteria:</FONT> </P>
<P><FONT face=Arial size=2>1) has registered an ASN and will be multi-homed to
two or more ISPs,</FONT> <BR><FONT face=Arial size=2>2) cannot reasonably
justify the use of a /24 within 3 - 6 months based on ARIN IP allocation
policies and</FONT> <BR><FONT face=Arial size=2>3) the customer is obtaining
IP space from one of their ISPs.</FONT> </P>
<P><FONT face=Arial size=2>In my view, such a customer will require at least a
/24 so that their network advertisement will be accepted by all ISPs since
most ISPs will not accept advertisements from their peers of networks
have a netmask any longer than a /24.</FONT></P>
<P><FONT face=Arial size=2>Is it acceptable, in ARIN's view, to assign a /24
to such a customer? I never came across any documentation at www.arin.net that
discusses such a situation.</FONT></P>
<P><FONT face=Arial size=2>Thanks, </FONT></P>
<P><FONT face=Arial size=2>Jon Foreman</FONT> <BR><FONT face=Arial size=2>BBO
- Data Install</FONT> <BR><FONT face=Arial size=2>jforeman@bbo.com</FONT>
<BR><FONT face=Arial size=2>Desk: 703.641.6451</FONT> <BR><FONT face=Arial
size=2>Mobile: 703.403.4263</FONT> <BR><FONT face=Arial size=2>Pager:
7034034263@message.bam.com</FONT> </P></BLOCKQUOTE></BODY></HTML>