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<DIV dir=ltr align=left><SPAN class=122095715-19012010><FONT face=Arial
color=#0000ff size=2>There is no way you are doing 5000 full 4-way handshakes a
second under ISC DHCP. We have tested this in the LAB extensively with the
fastest core hardware we could get using RAM disks and even then the most we
ever saw was around 450/second. 2-way handshakes you might see double that.
</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV class=Section1><B style="mso-bidi-font-weight: normal"><SPAN
style="FONT-FAMILY: Arial">Brad Dameron<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></B><BR><IMG
height=27 src="cid:122095715@19012010-01CB" width=91 v:shapes="_x0000_i1025">
<P class=MsoNormal style="mso-pagination: widow-orphan lines-together"><TT><SPAN
style="FONT-SIZE: 10pt">(425)216-4691 <SPAN
class=GramE>Desk</SPAN></SPAN></TT><BR><TT><SPAN
style="FONT-SIZE: 10pt">(360)340-7431 Mobile</SPAN></TT><BR><TT><SPAN
style="FONT-SIZE: 10pt">IM: <A title=blocked::serpent6877@yahoo.com
href="outbind://23-00000000029DEF604F3FF74E9CC062CD5464C7780700EBDEAF27DD61EA40A5DF1D15EAD9735300000071DB6F00006724EAC831AA6A4FBB9C93DFAD3A3BDC00000191157D0000/serpent6877@yahoo.com">serpent6877@yahoo.com</A></SPAN></TT></P></DIV>
<DIV> </DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B>
dhcp-users-bounces+brad.dameron=clearwire.com@lists.isc.org
[mailto:dhcp-users-bounces+brad.dameron=clearwire.com@lists.isc.org] <B>On
Behalf Of </B>Bunny Singh<BR><B>Sent:</B> Tuesday, January 19, 2010 6:39
AM<BR><B>To:</B> dhcp-users@lists.isc.org<BR><B>Subject:</B> Re: Concurrent hits
limitation<BR></FONT><BR></DIV>
<DIV></DIV>
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<DIV>Hi, </DIV>
<DIV> </DIV>
<DIV>We are going to update the RAM to 6 gb and no battery backed cache is
configured.</DIV>
<DIV> </DIV>
<DIV>> I find it hard to believe that you'll see 5000 DORAs per second,
unless<BR>>all of your clients come online at the same time. Do
they?<BR></DIV>
<DIV>Right now we have 48000 active clients, and i am wonder what would
happen after the downtime, when lots of hits will come at the same time.
Right now approx 250 concurrent connection (showing in the LB
connection established option) are there for the bootps. </DIV>
<DIV> </DIV>
<DIV>So i just want to know what would be the sizing and the
recommendation as per the Ip database and server specification.</DIV>
<DIV> </DIV>
<DIV>Regards</DIV>
<DIV>Daljit Singh<BR><BR>--- On <B>Mon, 1/18/10, Bunny Singh
<I><jump2fly82@yahoo.com></I></B> wrote:<BR></DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From:
Bunny Singh <jump2fly82@yahoo.com><BR>Subject: Re: Concurrent hits
limitation<BR>To: dhcp-users@lists.isc.org<BR>Cc:
sthaug@nethelp.no<BR>Date: Monday, January 18, 2010, 1:19 PM<BR><BR>
<DIV id=yiv845731360>
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<DIV> </DIV>
<DIV> </DIV>
<DIV>We are using dynamic DNS update and running two scsi disk on
RAID-1. We are having IBM X3650 server with 4 gb
RAM.</DIV>
<DIV> </DIV>
<DIV><FONT color=#ff007f><STRONG>How many IP addresses do you have
among your 800 subnets? What's your<BR>lease time? What's your
*target* for DHCP updates (Request/Ack)
per<BR>second?</STRONG></FONT></DIV>
<DIV><STRONG><FONT color=#ff007f></FONT></STRONG> </DIV>
<DIV>We have around 2, 00,000 Ip's. Our lease time is 4 days,
Target hits (DORA) will be 5000 per second.</DIV>
<DIV> </DIV>
<DIV>Actually we are in to IPTV services so clients booting their
STB's several times in a day.</DIV>
<DIV> </DIV>
<DIV>Also Please suggest is the server failover for the huge IP
database is good or we will put the servers (without running
failover protocol) behind the Loadbalance in Active Standby
state.</DIV>
<DIV> </DIV>
<DIV>Regards</DIV>
<DIV>Daljit Singh</DIV>
<DIV><BR><BR>--- On <B>Mon, 1/18/10, sthaug@nethelp.no
<I><sthaug@nethelp.no></I></B> wrote:<BR></DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From:
sthaug@nethelp.no <sthaug@nethelp.no><BR>Subject: Re:
Concurrent hits limitation<BR>To: dhcp-users@lists.isc.org,
jump2fly82@yahoo.com<BR>Date: Monday, January 18, 2010, 12:13
PM<BR><BR>
<DIV class=plainMail>> I want to know about the
limitation in DHCP server. Actually we are running dhcp on
failover mode with 800 subnet and it will be going to
expand.<BR>> <BR>> I need to know how many
hits (concurrent connections) dhcp services can
handle..<BR><BR>Heavily dependent on your disk subsystem. Also
on whether you use dhcpd<BR>to perform dynamic DNS
updates.<BR><BR>Handling DHCP requests is *disk intensive*. A
good RAID subsystem with<BR>lots of battery backed cache, or a
solid state disk, will do wonders.<BR></DIV>
<DIV class=plainMail><BR>How many IP addresses do you have among
your 800 subnets? What's your<BR>lease time? What's your
*target* for DHCP updates (Request/Ack)
per<BR>second?<BR><BR>Steinar Haug, Nethelp consulting, <A
href="http://us.mc450.mail.yahoo.com/mc/compose?to=sthaug@nethelp.no"
target=_blank
rel=nofollow>sthaug@nethelp.no</A><BR></DIV></BLOCKQUOTE></TD></TR></TBODY></TABLE><BR></DIV></BLOCKQUOTE></TD></TR></TBODY></TABLE><BR></BODY></HTML>