RE: Access-list & NAT [7:31152]

2002-01-07 Thread Lange, Eric

This should say it all.

http://www.cisco.com/warp/customer/556/5.html

-Eric

-Original Message-
From: Kwock99 [mailto:[EMAIL PROTECTED]]
Sent: Monday, January 07, 2002 10:02 AM
To: [EMAIL PROTECTED]
Subject: Access-list & NAT [7:31152]


Hi,

If I have access-list and NAT in my router, anyone knows which one will
apply
first.

Thanks.

Francis




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RE: IDS Test [7:30806]

2002-01-03 Thread Lange, Eric

No.  However,  I took the test, and failed it with a 755, and they do ask a
lot of GUI questions.  Specifically,  to do this function do you click on
this than click on this or, click on this than click on that.  Pretty
brutal.  I completed my CCNP almost a year ago and passed my MCNS exam about
3 months ago.  I thought this was the worst test so far, IMHO of course.  I
took the class, ordered the Boson exam, which out of 204 questions I scored
96% on, and still failed the test.  I know the only one to blame is my self.
Some of the questions I just didn't know the answers.  What do you do!  At
least I know what to study now!  

To make a short answer long.  You do NOT have to memorize all the
signatures.  Just know IP is 1000, ICMP is 2000 etc

Good luck!

-Eric 

-Original Message-
From: Jay Creasy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, January 03, 2002 11:56 AM
To: [EMAIL PROTECTED]
Subject: IDS Test [7:30806]


Does anyone have any info on the IDS test. Specifically, Do you have to
memories the couple hundered pages of Signatures in the IDS book ?

Thanks

Jay




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RE: question about VPN-IPSEC and NAT [7:30694]

2002-01-02 Thread Lange, Eric

IP protocol 50 and UDP port 500.  If you are doing AH you also need ip
protocol 51.

-Eric

-Original Message-
From: Leonardo Borda [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 02, 2002 12:55 PM
To: [EMAIL PROTECTED]
Subject: question about VPN-IPSEC and NAT [7:30694]


Hello,

I have in my organization a cisco router 2600 running NAT and IPSEC56. I
want to configure two access-lists. One for inbound access and another one
for outbound access and apply it in the same serial line.
Does anyone know what are the ports I have to permit to work that job
successfull as much inbound as outbound?

I had success in configuring internet access and it4s working fine but
over IPSEC my users from the other side of VPN can not access my exchange
server using VPN. but they can ping it...

thanks.

  Leonardo Borda.




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RE: NAT problems. [7:30679]

2002-01-02 Thread Lange, Eric

Could be DNS problem.  Try going to http://198.133.219.25/

This is Cisco.com.

Probably not a NAT/PAT issue.

Regards,
Eric

-Original Message-
From: Larry Brown [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 02, 2002 9:44 AM
To: [EMAIL PROTECTED]
Subject: NAT problems. [7:30679]


I set up nat with basic statements  

ip nat inside (fast 0)
ip nat outside (serial 0.1)
ip nat inside soure list 1 interface serial0.1 overload
access-list 1 permit 10.0.0.0 0.0.0.255 (This is the only access-list on the
box)

If I do a show ip nat translations I can see internal & external local and
global
mappings but only for icmp (when the user pings something) and udp - no tcp 
connections.  So, NAT&PAT is working.  The problem is Internet Explorer
times out.
Can I totally rule out NAT?  Anyone had this type of problem?

 



__
Do You Yahoo!?
Send your FREE holiday greetings online!
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RE: Fame Relay FECN BECN [7:29675]

2001-12-19 Thread Lange, Eric

When the frame has the DE bit set that is only telling the Frame-Relay
switch that if we experience congestion in our network the frames that have
the DE bit set are the frames that will be discarded first.  If you are
seeing no FECNs or BECNs that sounds to me like you are probably working
with a frame-relay provider that doesn't over subscribe it's trunks as much
as many other providers do.  That sounds refreshing for a change!  I would
say you want to implement traffic shaping regardless of the amount of DE
packets you are seeing.  DE packets are a good thing.  That's one of the
nice things about frame-relay.

Also keep in mind red frames.  If the frame-relay network is configured for
policing, any frames that are coming in faster than they are suppose to will
be dropped at the switch.  That is why it is so important to implement
traffic shaping.

Hope this helps!

-Eric

-Original Message-
From: Hire, Ejay [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, December 19, 2001 3:22 PM
To: [EMAIL PROTECTED]
Subject: RE: Fame Relay FECN BECN [7:29675]


Congratulations, you're working with a commercial frame-relay provider.
 When I was a sprint customer, they marked all of my traffic as DE,
regardless of CIR.  Very annoying.  FECN'S, BECN'S, and DE are all features
that your provider may or may not have configured (properly) in their
network.  They are required to pass data, not meet with accepted industry
standards. 

-Original Message-
From: DAGENHARDT Frank [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, December 19, 2001 2:43 PM
To: [EMAIL PROTECTED]
Subject: Fame Relay FECN BECN [7:29675]


Group,
 
I thought I had FECN and BECN down in regards to frame relay setup. Recently
I have come across some router output that doesn't make sence to me.
I don't understand why I have DE pkts when I don't have and FECN or BECN
errors. Or for that matter how I can have so many DE pks and no of them were
dropped. I was thinking of implementing traffic shaping, but I don't know if
that will help if I am not receiving any BECN errors. On top of that I
understand that when your CIR is reached packets get marked DE but at what
point do they actually get dropped. Can someone try to make a little sence
out of this for me?
 
DLCI = 131, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE =
Serial0/1.131
 
  input pkts 29103083  output pkts 23370364 in bytes 3538537810
  out bytes 941866396  dropped pkts 13  in FECN pkts 0
  in BECN pkts 0   out FECN pkts 0  out BECN pkts 0
  in DE pkts 1154469   out DE pkts 0
  out bcast pkts 1379364out bcast bytes 110300947
  pvc create time 10w2d, last time pvc status changed 3w2d
 
Thank you,
Frank




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FW: /31 subnet. [7:27742]

2001-11-30 Thread Lange, Eric

I thought  I sent this out earlier.  I may be mistaken.

-Eric

-Original Message-
From: Lange, Eric 
Sent: Friday, November 30, 2001 9:27 AM
To: [EMAIL PROTECTED]
Subject: RE: /31 subnet. [7:27742]


Sorry.  Looks like 12.2(2)T.



-Eric

-Original Message-
From: VoIP Guy [mailto:[EMAIL PROTECTED]]
Sent: Friday, November 30, 2001 8:44 AM
To: [EMAIL PROTECTED]
Subject: Re: /31 subnet. [7:27742]


It doesn't work in Cisco routers.

""Carroll Kong""  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Law of subnets is a tradeoff.  Bigger subnets, have higher
> efficiency, at the cost of bigger broadcast domains.  Smaller subnets have
> abysmal efficiency, at the benefit of smaller broadcast domains.
>  /31 is a new RFC proposed rule which eliminates the loss of
> effiency of 50% to.. 0%.
>  /30 has 2 usable addresses but loses 2 for broadcast and
> network.  So, you need 4 ips to make the subnet, but you only can use
> 2.  50% efficiency.  /31 is going to let you take 2, and use 2, and ignore
> the broadcast and network need.  This is ideal for point to point.
>
> At 08:32 AM 11/30/01 -0500, VoIP Guy wrote:
> >Maybe I'm missing something, but there are only 2 useable addresses in a
> >/30, and only 2 interfaces participating in a point-to-point link, so how
> >are there 50% of the addresses wasted.
> >
> >Steve
> >
> >
> >""MADMAN""  wrote in message
> >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > Point to point connections, with a /30 you waste 50% of the
> > > avaivalable addresses.
> > >
> > >   Dave
> > >
> > > Nicolas FEVRIER wrote:
> > > >
> > > > Hi group,
> > > >
> > > > I'm puzzled by the use of /31 subnets...
> > > > Anybody can explain me the benefits of such a subnet on an interface
?
> > > >
> > > > Thanxx.
> > > >
> > > > Nicolas.
> > > --
> > > David Madland
> > > Sr. Network Engineer
> > > CCIE# 2016
> > > Qwest Communications Int. Inc.
> > > [EMAIL PROTECTED]
> > > 612-664-3367
> > >
> > > "Emotion should reflect reason not guide it"
> -Carroll Kong




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RE: /31 subnet. [7:27742]

2001-11-30 Thread Lange, Eric

Sorry.  Looks like 12.2(2)T.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122
t/122t2/ft31addr.htm#xtocid104191

-Eric

-Original Message-
From: VoIP Guy [mailto:[EMAIL PROTECTED]]
Sent: Friday, November 30, 2001 8:44 AM
To: [EMAIL PROTECTED]
Subject: Re: /31 subnet. [7:27742]


It doesn't work in Cisco routers.

""Carroll Kong""  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Law of subnets is a tradeoff.  Bigger subnets, have higher
> efficiency, at the cost of bigger broadcast domains.  Smaller subnets have
> abysmal efficiency, at the benefit of smaller broadcast domains.
>  /31 is a new RFC proposed rule which eliminates the loss of
> effiency of 50% to.. 0%.
>  /30 has 2 usable addresses but loses 2 for broadcast and
> network.  So, you need 4 ips to make the subnet, but you only can use
> 2.  50% efficiency.  /31 is going to let you take 2, and use 2, and ignore
> the broadcast and network need.  This is ideal for point to point.
>
> At 08:32 AM 11/30/01 -0500, VoIP Guy wrote:
> >Maybe I'm missing something, but there are only 2 useable addresses in a
> >/30, and only 2 interfaces participating in a point-to-point link, so how
> >are there 50% of the addresses wasted.
> >
> >Steve
> >
> >
> >""MADMAN""  wrote in message
> >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > Point to point connections, with a /30 you waste 50% of the
> > > avaivalable addresses.
> > >
> > >   Dave
> > >
> > > Nicolas FEVRIER wrote:
> > > >
> > > > Hi group,
> > > >
> > > > I'm puzzled by the use of /31 subnets...
> > > > Anybody can explain me the benefits of such a subnet on an interface
?
> > > >
> > > > Thanxx.
> > > >
> > > > Nicolas.
> > > --
> > > David Madland
> > > Sr. Network Engineer
> > > CCIE# 2016
> > > Qwest Communications Int. Inc.
> > > [EMAIL PROTECTED]
> > > 612-664-3367
> > >
> > > "Emotion should reflect reason not guide it"
> -Carroll Kong




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RE: /31 subnet (now with info link) [7:27802]

2001-11-30 Thread Lange, Eric

It's wasn't supported until 12.2(4)T.  

Check it out.  This is from a 1750 running 12.2(4)T:

> interface Loopback9
>  ip address 111.11.1.1 255.255.255.254

It works!

-Eric

-Original Message-
From: VoIP Guy [mailto:[EMAIL PROTECTED]]
Sent: Friday, November 30, 2001 8:34 AM
To: [EMAIL PROTECTED]
Subject: Re: /31 subnet (now with info link) [7:27802]


Just tried it and the router dosen't even allow an interface to use a /31
mask, even with ip subnet-zero enabled.


""VoIP Guy""  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> I read the RFC, so I guess it can be used.  My bad.
>
> AM I correct in saying that one interface will be assigned the all zero
> subnet as it's IP and the other will be assigned the broadcast IP address
> for that subnet?
>
> Steve
>
>
>
> ""VoIP Guy""  wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > I know that, but the network and broadcast addresses are unusable.  Thus
> the
> > two good addresses for hosts.
> > ""Craig Columbus""  wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > With a /30 you use 4 IP addresses (network, 2 node, 1 broadcast).  You
> > save
> > > addresses with a /31.
> > > Here's a link with more info:
> > >
> > > http://www.ietf.org/rfc/rfc3021.txt?number=3021
> > >
> > > Thanks,
> > > Craig
> > >
> > > At 08:32 AM 11/30/2001 -0500, you wrote:
> > > >Maybe I'm missing something, but there are only 2 useable addresses
in
> a
> > > >/30, and only 2 interfaces participating in a point-to-point link, so
> how
> > > >are there 50% of the addresses wasted.
> > > >
> > > >Steve
> > > >
> > > >
> > > >""MADMAN""  wrote in message
> > > >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > > > Point to point connections, with a /30 you waste 50% of the
> > > > > avaivalable addresses.
> > > > >
> > > > >   Dave
> > > > >
> > > > > Nicolas FEVRIER wrote:
> > > > > >
> > > > > > Hi group,
> > > > > >
> > > > > > I'm puzzled by the use of /31 subnets...
> > > > > > Anybody can explain me the benefits of such a subnet on an
> interface
> > ?
> > > > > >
> > > > > > Thanxx.
> > > > > >
> > > > > > Nicolas.
> > > > > --
> > > > > David Madland
> > > > > Sr. Network Engineer
> > > > > CCIE# 2016
> > > > > Qwest Communications Int. Inc.
> > > > > [EMAIL PROTECTED]
> > > > > 612-664-3367
> > > > >
> > > > > "Emotion should reflect reason not guide it"




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RE: /31 subnet. [7:27742]

2001-11-30 Thread Lange, Eric

I think this can sum it up.

http://www.faqs.org/rfcs/rfc3021.html

-Eric

-Original Message-
From: VoIP Guy [mailto:[EMAIL PROTECTED]]
Sent: Friday, November 30, 2001 7:33 AM
To: [EMAIL PROTECTED]
Subject: Re: /31 subnet. [7:27742]


Maybe I'm missing something, but there are only 2 useable addresses in a
/30, and only 2 interfaces participating in a point-to-point link, so how
are there 50% of the addresses wasted.

Steve


""MADMAN""  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Point to point connections, with a /30 you waste 50% of the
> avaivalable addresses.
>
>   Dave
>
> Nicolas FEVRIER wrote:
> >
> > Hi group,
> >
> > I'm puzzled by the use of /31 subnets...
> > Anybody can explain me the benefits of such a subnet on an interface ?
> >
> > Thanxx.
> >
> > Nicolas.
> --
> David Madland
> Sr. Network Engineer
> CCIE# 2016
> Qwest Communications Int. Inc.
> [EMAIL PROTECTED]
> 612-664-3367
>
> "Emotion should reflect reason not guide it"




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RE: multiple DHCP scopes in a vlan with primary an [7:27264]

2001-11-26 Thread Lange, Eric

The ip helper-address command is your buddy.  The router can convert a UDP
broadcast packet into a unicast and route the packet to the appropriate
network that the DHCP server resides on.  

-Eric

-Original Message-
From: Logan, Harold [mailto:[EMAIL PROTECTED]]
Sent: Monday, November 26, 2001 11:41 AM
To: [EMAIL PROTECTED]
Subject: RE: multiple DHCP scopes in a vlan with primary an [7:27264]


For those of you that have implemented VLANs with DHCP, do you use one
DHCP server per VLAN, or is there a way to bind a specific DHCP scope to
each VLAN?

Thanks,
Hal


> -Original Message-
> From: Syed Raza [mailto:[EMAIL PROTECTED]]
> Sent: Monday, November 26, 2001 11:59 AM
> To: [EMAIL PROTECTED]
> Subject: Re: multiple DHCP scopes in a vlan with primary an [7:27264]
> 
> 
> It is not recommended to have multiple subnet in one VLAN. 
> Basically you are
> killing the whole concept of isolating the broadcast domain. 
> But you can not
> argue that it does'nt work. Your DHCP server can assign any 
> ip from its
> scopes.




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RE: FTP Server [7:24525]

2001-10-30 Thread Lange, Eric

e7phem7er7al (i-fem'?r-?l)
adj.
Lasting for a markedly brief time: "There remain some truths too ephemeral
to be captured in the cold pages of a court transcript" (Irving R. Kaufman).
Living or lasting only for a day, as certain plants or insects do.
n.
A markedly short-lived thing.

I needed to look it up : )
-Eric


-Original Message-
From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, October 30, 2001 2:43 PM
To: [EMAIL PROTECTED]
Subject: Re: FTP Server [7:24525]


If it's not passive mode, the data channel is initiated by the server from
port 20 (FTP data) to the ephemeral port provided by the client in its PORT
command. Ephemeral just means a short-lived port with a number greater than
1023.

If it is passive mode, then the data channel is initiated by the client
from an ephemeral port to an ephemeral port provided by the server in its
PASV command.

In other words, access lists with FTP are tricky.

Priscilla

At 03:14 PM 10/30/01, Jonathan Hays wrote:
>Michael Williams wrote:
>
> > That would work, although you don't need the "deny ip any any" as there
is
> > always an implied "deny all" at the end of the access list.
> >
> > However, to protect yourself from unwanted traffic/attacks, you can
changed
> > your access list to only allow traffic incoming on port 21 (eq ftp):
> >
> > access-list 110 permit tcp any host 192.3.10.10 eq ftp
> >
>
>Don't we also want a ACL line for the ftp data channel?
>
>access-list 110 permit tcp any host 192.3.10.10 eq ftp-data
>
>And if the server is using passive ftp
>
>access-list 110 permit tcp any host 192.3.10.10 gt 1023 established


Priscilla Oppenheimer
http://www.priscilla.com




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RE: PIX subnet access-lists [7:23797]

2001-10-22 Thread Lange, Eric

I don't think you want to use the 'host' command when specifying a subnet.
Try this:

access-list acl_out permit tcp 212.113.2.0 255.255.255.0 host
124.49.114.6 eq ftp

-Eric

-Original Message-
From: John Zei [mailto:[EMAIL PROTECTED]]
Sent: Monday, October 22, 2001 12:32 PM
To: [EMAIL PROTECTED]
Subject: PIX subnet access-lists [7:23797]


Does anyone know the access-list command that would allow an entire subnet
into an ftp site.  Here are some examples of what I've tried:
access-list acl_out permit tcp host 212.113.2.0 255.255.255.0 host
124.49.114.6 eq ftp
access-list acl_out permit tcp host 212.113.2.0 255.255.255.0 host
124.49.114.6 255.255.255.255 eq ftp

Neither of these worked.

Thanks,
John




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RE: Traffic Shaping [7:21991]

2001-10-04 Thread Lange, Eric

John,

Most of the traffic shaping I have done is with data only.  T1 to 56k for
example.  The rules may be very different (and I'm sure they are) while
doing VoIP.  

Traffic shaping a T1 to a 56K is pretty strait foreword.  I try and follow
the 1/8th rule when configuring my bc value.  I also always configure my CIR
to available bandwidth (not true CIR) and mincir to what is the "true CIR". 

map-class frame-relay 56k
 no frame-relay adaptive-shaping
 frame-relay cir 56000
 frame-relay bc 8000
 frame-relay be 0
 frame-relay mincir 28000

This rule seems to work great until you traffic shape a T1 pvc.

The Cisco algorithm seems to break while applying the 1/8th rule to bc. I
have been advised, please correct me if I am wrong, that the bc value should
never exceed 8.  If you are shaping T1 PVC (T1 to T1) your map class
should look like the following.

map-class frame-relay T1
 no frame-relay adaptive-shaping
 frame-relay cir 1536000
 frame-relay bc 8
 frame-relay be 0
 frame-relay mincir 768000

To verify this after applying these map class changes do a 'sh traffic' and
verify the math.

Take your interval value (given in ms) and invert it (1 / interval time in
ms).  This will give you the amount of intervals per second.  Multiply this
number by Sustain bits/interval.  This should be close to the Cisco CIR
value plus or minus a little bit.  

Here is an example:

c3640A#sh traffic

Interface   Se1/0.101
   Access TargetByte   Sustain   ExcessInterval  Increment Adapt
VC List   Rate  Limit  bits/int  bits/int  (ms)  (bytes)
Active
101   56000 8757000  0 125   875   -

1/.125 * 7000 = 56000 (Your target rate)

This is what has worked for me in the past.

You may want to do adaptive shaping, but probably not with voice.

Hope this helps.

If someone can add additional insight to FRTS with VoIP please help.

Thanks,
-Eric



 

-Original Message-
From: John Neiberger [mailto:[EMAIL PROTECTED]]
Sent: Thursday, October 04, 2001 12:05 PM
To: [EMAIL PROTECTED]
Subject: RE: Traffic Shaping [7:21991]


Here is a portion of one of the configs.  For some reason, whenever I
turn on FRTS my telnet sessions get *really* jumpy.  Sometimes it almost
seems the router locks up but I think it's just my telnet session.  If I
turn off FRTS on the main interface that jumpiness goes away.

In this particular case I haven't applied the VoIP class to all PVCs
and I'm wondering if that might cause a problem.  We have two other
locations that we're testing VoIP with and they have a direct PVC
between them.  VoIP calls between them sounds fine.

When we shutdown that PVC and then route the traffic through the
location whose config I'm including, the call quality is beyond horrid. 
Demons gargling acid in Hell probably sound better than this.  :-)

Any thoughts?

Thanks,
John

class-map match-any voicecalls
  match ip precedence 4 
class-map match-all VoIP-Control
  match access-group name VoIP-Control
!
!
policy-map voice
  class voicecalls
priority 192
  class VoIP-Control
   bandwidth 8
  class class-default
   fair-queue

interface Serial0/0
 encapsulation frame-relay
 no ip mroute-cache
 no fair-queue
 frame-relay traffic-shaping
!
interface Serial0/0.16 point-to-point
 ip address 10.12.11.75 255.255.255.0
 no ip mroute-cache
 frame-relay interface-dlci 16   
!
interface Serial0/0.18 point-to-point
 ip address 10.12.24.70 255.255.255.0
 frame-relay interface-dlci 18   
  class VoIP
!
interface Serial0/0.23 point-to-point
 ip address 10.12.26.70 255.255.255.0
 no ip mroute-cache
 frame-relay interface-dlci 23   
  class VoIP
!
map-class frame-relay VoIP
 no frame-relay adaptive-shaping
 frame-relay cir 256000
 frame-relay bc 2560
 frame-relay be 0
 frame-relay mincir 256000
 service-policy output voice


>>> "[EMAIL PROTECTED]"  10/4/01 10:25:25 AM >>>
Can you send the config?  I have been spending allot of time doing
traffic
shaping and may be able to lend some insight if I see the config.

-Eric

-Original Message-
From: John Neiberger [mailto:[EMAIL PROTECTED]] 
Sent: Thursday, October 04, 2001 10:07 AM
To: [EMAIL PROTECTED] 
Subject: Re: Traffic Shaping [7:21991]


I've had odd results implementing FRTS, as well.  I've been told by a
Cisco engineer that it helps to reload the router after applying or
changing FRTS commands.  I don't know if it's necessary but he said it
makes things work a little better.  I haven't noticed a difference but
perhaps it's worth a try.

John

>>> "Thomas N."  10/3/01 10:11:15 PM >>>
Hi All,

I implemeted the Traffic Shaping using map-class and assigned to
subinterfaces.  The PVCs sharing that physical interfaces however
increase
in reply time and eventually timeout.  What did I do wrong?  When I
tried
General Traffic Shaping, it worked with "traffic-shape rate" and
"traffic-shape adaptive" commands.  The reason I would like to
implement
Traffic Shaping with map-class because I would like to apply
"Frame-Relay
f