We use Blackholing extensively to protect our campus network from "bad"
machines. I did a writeup (replete my own personal brand of braindead
typos) a while back that details out how we set it up using OSPF and uRPF.
http://www.merit.edu/mail.archives/nanog/2003-11/msg00225.html
There are mec
What we do is to use the "priority" setting in the 3750 to determine who
is the master.
switch(config)#switch 1 priority 15
This will define that switch in the stack as the highest priority, then
set your next one to 14, etc etc through the stack. That way you will
always have deter
Oh certainly, RIPv2. I tend to just assume that "RIP" is generic and
everyone means v2.
- Robert
On Thu, 16 Sep 2004 [EMAIL PROTECTED] wrote:
> > We use RIP extensively on the edges of our network to build a Layer3
> > routed overlay between 3550/3750 switches and our 6500-based core. At
We use RIP extensively on the edges of our network to build a Layer3
routed overlay between 3550/3750 switches and our 6500-based core. At
$2k/list for the EMI license PER SWITCH ($4k for 3750s), it just wasn't
feasible for us to use EMI just for OSPF when all we were really
announcing was a
Thank you all for the responses. I got about 35 reponses and 34 of them
strongly suggested www.asterisk.org as an open-source linux-based solution
that will work with either 4-port POTs PCI cards or 1- or 4-port T1
PCI cards.
Also recommended were Turn-key solutions at www.conference-bridge.n
While this isn't directly networking related, I thought any followups
might be of interest so I'm posting here.
I'm looking to find a fairly inexpensive piece of hardware that will allow
me to set up a easy permanent telephone conference bridge. The purpose
would be to allow engineers and man
It is my firm believe that if a Powerpoint presentation was to say "The
Ocean is made of Yogurt", it would be believe by management. I believe
next time I give a presenation I will put that line in.
- Robert
On 24 Mar 2004, Robert E. Seastrom wrote:
>
>
> vijay gill <[EMAIL PROTECTED]> wri
Still 404s on me now when I try to log into CCO or follow any of my
bookmarks to case query, pricelist, or TAC Case generation.
Todays excuse of the day is:
SUNSPOTS!
On Mon, 15 Mar 2004, Todd Mitchell - lists wrote:
>
> | Behalf Of Jay Hennigan
> | Sent: March 15, 2004 3:19 PM
> |
> |
On Wed, 7 Jan 2004, Robert Blayzor wrote:
>
> On 1/7/04 6:31 PM, "Frank Louwers" <[EMAIL PROTECTED]> wrote:
>
> > Don't they use MMDDNN now? So today's version whould be 2004010801.
> > AFAIK, 1076370400 is actually "less" then 2004010801...
> >
> > I know there are ways to "trick" nameser
On Wed, 17 Dec 2003, Pekka Savola wrote:
> Now, we've seen a few pics of "good" cabling as well.
>
> However, I'm forced to ask which kind of "good cabling" is possible in
> a dynamic environment when you plug in/out, change, etc. the cables.
> This seems to invariably lead to total chaos :
Hey all,
This one is a weird one. I apologize if this is a bit off topic.
As everyone is probably aware, the Cisco 6500/7600 line is unable to
provide per-vlan I/O statistics on routed interfaces (ie, a "show int vlan
xxx" has meaningless numbers in the I/O and error fields at the end).
MIB t
I posted earlier mentioning that I was using uRPF to facilitate a
blackhole routing system on our campus. I went off to lunch and came back
to 38 private emails from people asking how I'm doing it. Rather than
respond individually, I figured I'd post an informal synopsis here.
First, I'm a n
We got so sick of dealing with Nachi that we stepped up deployment of a
uRPF-based blackhole routing system campus wide. Now when the flows show
something abnormal, we just blackhole the offending computer and
auto-generate and email to the admins of that IP space and then send them
auto nag-
On Thu, 6 Nov 2003, Eric Kuhnke wrote:
>
> Certainly not as cheap as a 2950 with two Gb ports, but this is the start
> of an entirely new generation of edge switches. Does anyone want to hazard
> a guess as how long it will be before 24+10Gb switches are selling for $1,500?
> 3 years?
Certai
2003, Jeffrey Paul wrote:
>
>
> > -Original Message-
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> > Behalf Of Robert A. Hayden
> > Sent: Wed, 2003-11-05 12:50
> > To: Joe Abley
> > Cc: Neil J. McRae; Mike Tancsa; Robert E. Seastrom; [EM
I've seen some designs that actually use water as the transport and
many-finned radiators at each end. Radiator transfer heat into cold water
inside which is pumped up a radiator in the sub-zero temps on the roof and
exchanged and then looped back.
Same basic principle as a traditional reside
I'd like to take a moment to quickly publicly thank Darryl, Kevin and Roy
from Level 3 that jumped on this issue right away tearing through logs and
historicals and then watching the suspect link and providing me the
debugging information.
In addition, I also was contacted by Todd from Covad and
7600 is also vertical boards whereas the 6500 is horizontal.
On Mon, 13 Oct 2003, Simon Lockhart wrote:
>
> On Mon Oct 13, 2003 at 01:19:21PM -0700, Tom (UnitedLayer) wrote:
> >
> > On Mon, 13 Oct 2003, Michel Py wrote:
> > > Aren't most of the 6500 blades the same as the 7600 ones anyway? Bet
Hey all,
I apologize for posting this here, especially for what is essentially an
end-user broadband issue, but I'm looking at what appears to be a link a
few hops upstream from me that has been flapping frequently and I can't
get our provider to look into it.
I am located in Madison, WI, and I
"Verisign Highjacks Internet"
That should work :-)
On Wed, 8 Oct 2003, Mike Tancsa wrote:
>
> At 03:06 PM 08/10/2003, [EMAIL PROTECTED] wrote:
>
>
> >In these days of corporate malfeasance scandal coverage, you'd think that
> >Verisign's tactics would have whetted the appetite of some brigh
On Tue, 16 Sep 2003, Damian Gerow wrote:
> How about, 'Internet Operators Across North America Struggle to Deal with
> Impact of Business Decision: Internet Functionality Worldwide
> Tampered With by Verisign'? There doesn't really appear to be a unified
> decision to do one thing, there's a lot
Can't NAT-like devices be just as viable as a security device as well?
Is the ISP willing to take responsiblity for security breaches on my home
network because they banned my firewall? From a
political/public-perception standpoint, treat those ISPs that are
complaining about NAT as being soft on
What about doing some priority-based QoS? If a single IP exceeds X amount
of traffic, prioritize traffic above that threshold as low. It would keep
any one single host from saturating a link if the threshold is low.
For example, you may say that each IP is limited to 10mb of prioirty
traffic.
Works fine if you do it using x.25 :-)
On Fri, 10 Jan 2003, Andy Dills wrote:
>
> On Fri, 10 Jan 2003, Al Rowland wrote:
>
> >
> > And you are using shielded cable, correct?
>
> Nah, I'm guessing he strung bare copper seperated by cotton balls.
> That's what I like to use in my 27-floor 100tx ru
I'm still failing to see why this required a $3M forklift of new equipment
to correct the problem. Was this just Cisco sales pouncing on someone's
misfortune as a way to push new stuff?
On Thu, 28 Nov 2002, Stephen J. Wilcox wrote:
>
> Heh, so they kept bolting stuff on and a failure somewhere
Yup. I like using OSPF to set up the mesh to the loopbacks and then ibgp
as the IGP.
On Thu, 29 Aug 2002, Michael Hallgren wrote:
> >Um. Set up more than one reflector
>
> yes... and align your setup with your physical topology(so making it
> useful);
> use other proto for mapping your in
way. Trying not to start a religious war.
On Thu, 29 Aug 2002, Ralph Doncaster wrote:
> On Thu, 29 Aug 2002, Robert A. Hayden wrote:
>
> > Um. Set up more than one reflector
>
> So how many is enough? I would think 3 is a minimum to come close to the
> reliabili
Um. Set up more than one reflector
On Thu, 29 Aug 2002, Ralph Doncaster wrote:
>
> On Thu, 29 Aug 2002, Peter van Dijk wrote:
>
> > On Thu, Aug 29, 2002 at 01:09:54PM -0400, [EMAIL PROTECTED] wrote:
> > > > Has anybody mentioned the benefits of ISIS as an IGP to them.
> > > Link-state prot
1 at 15:25, Robert A. Hayden wrote:
> > Yea. Good luck getting a DSL provider to swip an IP to you or to be
> > willing to register an IP for you.
> If you have a /29 or shorter they **HAVE** to swip it. Else they can't
> get numbers from ARIN.
>
> So, that point is moot.
>
>
>
>
Yea. Good luck getting a DSL provider to swip an IP to you or to be
willing to register an IP for you.
On Wed, 21 Aug 2002, Robert Blayzor wrote:
>
> > What about individuals that run their own mail servers? (E.G. me).?
>
> Get your mail server registered just like everyone else I suppose. I
Increased power demands from all the paper shredders? ;-)
On Thu, 11 Jul 2002, Gary E. Miller wrote:
>
> Yo Martin!
>
> If there is plenty of power in CA then howcum there was a "stage 2" alert
> yesterday and a "market alert today"? Today's "projected demand" equaled
> "available resources" t
Of course, the other question is whether Qwest will be around in six
months or if it will face the same Enron/Worldcom implosion we're seeing
now...
On Tue, 9 Jul 2002, Vincent J. Bono wrote:
>
> We always hear the worst but I just thought I would plug Qwest in that they
> just installed an OC-
On Mon, 1 Jul 2002, Leo Bicknell wrote:
> There is no way for a company to price transit below their peering
> costs and make money. So the question becomes, is $50/meg too low.
> I believe so. I think that the companies selling at $50 a meg are
> in a desperate attempt to get revenue in the d
GAH! Sorry, bad typo.
On Tue, 18 Jun 2002, Robert A. Hayden wrote:
>
> Most providers provide some kind for forward/reverse mapping, including
> ATTBI. Often, however, they do provide customized reverse mapping (ie,
^^ do not
> myhost.mydomain.com
Most providers provide some kind for forward/reverse mapping, including
ATTBI. Often, however, they do provide customized reverse mapping (ie,
myhost.mydomain.com). That may be where the disconnect.
I believe that ATTBI has a script that auto-generates forward/reverse
mappings on a regular bas
Sometimes it feels like the support departments just scan cnn.com to find
a catastrophe to blame an outtage on.
"A butterfly in outter mongolia flapped its wings" will probably be cited
before long...
On Thu, 25 Apr 2002, Sean Donelan wrote:
>
>
> That's unusual. A train derailment usually ef
On Wed, 13 Mar 2002, Sean Donelan wrote:
> Interesting idea. It would be nice if ISPs also had a way to
> instantly talk with one another.
I thought that was NANOG ;-)
37 matches
Mail list logo
