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Conference noted::seal

Title:SEAL
Moderator:GALVIA::SMITH
Created:Mon Mar 21 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1989
Total number of notes:8209

1787.0. "FW, tri-home, Proxy Server, T1, & DHCP sizing?" by TENNIS::KAM (AltaVista Software 714/261-4133 DTN 535.4133) Tue Feb 11 1997 02:44

    I read the following threads on sizing firewalls.  However, we have a
    particular situation:
    
    	Customer, grammar school, will have 2000 clients and wants to know 
    if a AlphaServer 1000A will be sufficient.  On the firewall system will 
    be the following:
    
    	1] T1 at the Internet (RED Net)
    	2] They want the Firewall system to do DHCP for the 2000 clients
    	3] Support a Proxy Server, we've informed them that the FW already 
           has cache for the web proxy (question 4444.13).  We hope to 
     	   eliminate this
    	4] Support for Green net on the Firewall
    
    If you have any experiences that you can share we'd greatly appreciate
    it.
    
    	Regards,
    
    
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                                      SEAL
Created: 21-MAR-1994 15:17         1785 topics        Updated: 10-FEB-1997 19:38
 Topic  Author               Date         Repl  Title
--------------------------------------------------------------------------------
   625   KETJE::BEYENS       22-SEP-1995     1  Sizing firewall systems ?
   690   TPOVC::ARROWWU      22-OCT-1995     5  How to limit the mail size in sendmail.cf
   980  ispics.stl.dec.com::  6-MAR-1996     7  Sizing of box to link speed
  1026  MXOC00::ALVAREZ      26-MAR-1996     7  Why SUN's marketshare is larger?, Sizing?
  1121   CHEFS::ANDERSONR    21-MAY-1996     6  URGENT HELP REQD - Firewall Sizing ****
  1142   HGOVC::CHRISTSANG    5-JUN-1996     1  Concurrent users support and sizings
  1278  CECAMO::JAGERMAN      2-AUG-1996     2  Sizing considerations of group tunnel?
    
T.RTitleUserPersonal
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1787.1QUICHE::PITTAlph a ha is better than no VAX!Wed Feb 12 1997 05:5218
Of course a 1000A will cope, if it has enough memory.  An AlphaStation 255 would
cope as well.  As for memory and disk requirements, you've listed several notes
that contain that information - there's also at least one from me somewhere -
use the AltaVista Notes Search to find it!!!

I would be very concerned about running the firewall as a DHCP server.  Perhaps
someone else can be more specific about this, but my concern is that DHCP should
be entirely an internal function, and putting it on the firewall is therefore a
bad move.  The firewall should not have arbitrary additional software (either
additional bits of UNIX, or additional layered products or other programs) added
to it, unless someone is going to work hard to check the security of these
additional bits.  The implications of the DHCP server are currently unknown at
least to me.  (I do know that you would have to tweak the ifaccess.conf file to
make it work, because the firewall would have to respond to IP packets with
source address 0.0.0.0, and these would by default only be accepted from the
external interface ...)

T