[Search for users] [Overall Top Noters] [List of all Conferences] [Download this site]

Conference noted::decnis

Title: DEC Network Integration Server (DECNIS)
Notice:Please read note 1 to use this conference effectively
Moderator:MARVIN::WELCH
Created:Wed Sep 18 1991
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3660
Total number of notes:15082

3595.0. "Help with IP packet filtering approach" by KAONIS::HYNDMAN (Sled Head) Wed Apr 09 1997 17:16

    
    
    I would like to restrict ip access from a remote location to specific
    hosts.  The type of ip access from these nodes would not be restricted.
    After reading the documentation for V3.1, which we are running
    (V3.1-9), it would appear IP packet filtering is the correct mechanism.
    However it looks to be horrendous and will require numerous lines of
    ncl.  I hope I'm missing something.  Here is what I believe are the
    correct elements to make this work.
    
    1. create priority
    2. create priority interfaces
    3. create priority filter for type pass tcp, pass udp, pass icmp
    4. set priority filter nnnn inbound interface priority interface
       l601-3-0, source address value xx.xx.xx.xx, source address mask 
       255.255.255.255
    5. repeat step four for every host
    6. repeat step 4 and 5 for the wan interface
    7. repeat step 3, 4, 5, 6 to create reverse pass filter
    8. enable the whole mess
    9. drink much rum while spending many hours debugging ncl try to find 
       my mistakes
    
    	
    Scott
T.RTitleUserPersonal
Name		DateLines
3595.1Wait for the V1.1 release of the DECNIS Configurator.MARVIN::MILLSThu Apr 10 1997 05:4345
Hi Scott,

for the V4.0 release of DECNIS we shipped Secure Connections
that will perform the task you are attempting. Along with this
release we shipped the DECNIS GUI Configurator for windows NT and
95 that had support for this feature.

Secure connections allows you to specify rules for PERMITing or 
DENYing connection requests being forwarded through the DECNIS. 
IP  (TCP, UDP and ICMP), DECnet Phase IV and DECnet Phase V/OSI 
connection packets can be filtered against you configured rules.

For example you can define a rule to :-

For TCP/IP,
	From node : FOO
	From circuit: circuit-1
	From Port: any port

	To node : BLAH
	To circuit : circuit-2
	To port : TELNET, FTP, FTP-DATA

	Hours: All Day
	Days: All Week

	DENY this connection.

The configurator will present you with a set of screens that
will help you develop this rules, and a file is generated along with
the NCL script that can be combined with the image file or 
down-line loaded seperatly onto the NIS.

We are very close to shipping the V1.1 release of the Windows
configurator, and I would highly recommend you wait until its release
if you wish to use secure connections.

Note that the Windows configurator for DECNIS is the only way of
configuring Secure Connections rules.

Hope this helps.

Regards,

Grant.
3595.2KAONIS::HYNDMANSled HeadThu Apr 10 1997 11:3716
    
    Grant,
    
    	Thanks for your reply.  I have looked at the GUI configurator and
    read some of the features of the Secure Connections.  These certain add
    value for the decnis product.  Unfortunately I can't wait as we have to 
    implement this next week.  Also we will have to purchase a new MPC
    card for the decnis inorder to support  V4.x of the software.  This
    will be hard to justify since we can buy a whole new router for less than
    the price of the MPC and it supports these features today.
    	
    	In the absence of the gui configurator and V4.x, are the steps in my
    base note the approach to achieve this functionality today?
    
    
    Scott
3595.3Do you have MPC-II?MARVIN::WELCHFri Apr 11 1997 05:077
Scott,
     as long as you have MPC-II you can run V3.1-9 or V4.0-2 software. MPC-III
is recommended if the cutomer wants a complex security setup. The overhead of 
checking each packet against a large number of Secure Connections rules is CPU 
intensive.  

Steve.