What would be nice would be if we changed the semantics a bit and made
it 16+48+64 where the first 16 of the dest+source could be
re-assembled
into the destination ASN for the packet and the remaining 48
identified
a particular subnet globally with 64 for the host. Unfortunately, that
What would be nice would be if we changed the semantics a bit and made
it 16+48+64 where the first 16 of the dest+source could be
re-assembled
into the destination ASN for the packet and the remaining 48
identified
a particular subnet globally with 64 for the host. Unfortunately, that
ship
In a message written on Sat, Oct 23, 2010 at 05:23:14PM -0700, Owen DeLong
wrote:
On Oct 23, 2010, at 8:03 AM, Carlos Martinez-Cagnazzo wrote:
On Fri, Oct 22, 2010 at 11:38 AM, Leo Bicknell bickn...@ufp.org wrote:
There are some folks (like me) who advocate a DHCPv6 that can convey
a
On Oct 24, 2010, at 6:48 AM, Leo Bicknell wrote:
In a message written on Sat, Oct 23, 2010 at 05:23:14PM -0700, Owen DeLong
wrote:
On Oct 23, 2010, at 8:03 AM, Carlos Martinez-Cagnazzo wrote:
On Fri, Oct 22, 2010 at 11:38 AM, Leo Bicknell bickn...@ufp.org wrote:
There are some folks (like
1) How necessary do you believe in local NTP servers? Do you really need th=
e logs to be perfectly accurate?
2) If you do have a local NTP server=2C is it only for local internal use=
=2C or do you provide this NTP server to your clients as an added service?
3) If you do have a local NTP
On 24/10/10 5:44 PM, Peter Lothberg wrote:
How do you knew that your local NTP server knew what time it is? (for sure)
By polling as many stratum 1 and 2 time servers as possible. Having
your own stratum 2 server(s) beats nebulous NTP servers out in the big
bad Internet every time.
On Mon, Oct 25, 2010 at 02:51:24AM +1100, Ben McGinnes wrote:
How do you knew that your local NTP server knew what time it is? (for sure)
By polling as many stratum 1 and 2 time servers as possible. Having
your own stratum 2 server(s) beats nebulous NTP servers out in the big
bad
On 10/24/2010 5:05 AM, George Bonser wrote:
And speaking of changing MTU, is there any reason why private exchanges
shouldn't support jumbo frames? Is there any reason nowadays that things
that are ethernet end to end can't be MTU 9000 instead of 1500? It
certainly would improve performance
Wow that is amazing and quite impressive that you even run the antenna
linesinteresting..do you have to pay for the GPS service?
Subject: Re: NTP Server
To: brandon@brandontek.com
From: jkre...@usinternet.com
Date: Sun, 24 Oct 2010 15:52:03 +
Internet ntp is not as
I guess what I'm trying to understand is, is having your own NTP server just a
luxury?
I personally would like to have my own, I just need to pitch its advantages to
my company. Unless everyone here on the NANOG group
clearly spells it out to me that it's a luxury.
I can see it as an added
On 10/24/2010 09:26, Brandon Kim wrote:
Wow that is amazing and quite impressive that you even run the antenna
linesinteresting..do you have to pay for the GPS service?
Make your own simple GPS NTP clock source:
http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm
~Seth
On 10/24/10 9:34 AM, Brandon Kim wrote:
I wanted to open up this question regarding NTP server. I recalled
someone had created a posting of this quite awhile back.
From a service provider/ISP standpoint, does anyone think that
having a local NTP server is really necessary?
It may not be
In a message written on Sun, Oct 24, 2010 at 11:09:28AM -0500, Jack Bates wrote:
variety of tags/tunnels/etc by the time it gets to the cell phone. It
cracks me up that SONET interfaces default 4470, and ethernet still
defaults to 1500. I've yet to see an MTU option in standard circuit
1) How necessary do you believe in local NTP servers? Do you really
need the logs to be perfectly accurate?
what is perfectly accurate? perfection is not very realistic. to
what use do you put these logs? what precision and jitter are required
for that use?
imiho, if you are just
Time Service is more complicated than just having a single NTP server. But it
can be useful and is not really a luxury.
Two primary reasons for local time service are to reliably serve a network that
is relatively or completely isolated from the general internet, and, to provide
a local time
More than likely, it's more important that all your machines are synced
accurately in time to each other, vs. a wider sync range that's
statistically closer to the 'real' value.
-Jack Carrozzo
On Sun, Oct 24, 2010 at 1:09 PM, Randy Bush ra...@psg.com wrote:
1) How necessary do you believe in
On Sun, Oct 24, 2010 at 10:44 AM, Peter Lothberg r...@stupi.se wrote:
1) How necessary do you believe in local NTP servers? Do you really need th=
e logs to be perfectly accurate?
2) If you do have a local NTP server=2C is it only for local internal use=
=2C or do you provide this NTP server
In a message written on Sun, Oct 24, 2010 at 11:34:12AM -0400, Brandon Kim
wrote:
From a service provider/ISP standpoint, does anyone think that having a local
NTP server is really necessary?
Do you provide NTP to your customers?
If you do there is probably an obligation there to make a
On 10/24/2010 12:29 PM, Brandon Kim wrote:
I guess what I'm trying to understand is, is having your own NTP server just a
luxury?
I personally would like to have my own, I just need to pitch its advantages to
my company. Unless everyone here on the NANOG group
clearly spells it out to me that
James --
Well said. I was going to submit the exact same thing. This is what we we
do at my company and it works extremely well - we only use three stratum-1
time servers, and three internal servers to go get the time from the three
externals, via a one-to-one correspondence. Once all three
On 10/24/10 10:20 AM, Christopher Morrow wrote:
On Sun, Oct 24, 2010 at 10:44 AM, Peter Lothberg r...@stupi.se wrote:
1) How necessary do you believe in local NTP servers? Do you really need th=
e logs to be perfectly accurate?
2) If you do have a local NTP server=2C is it only for local
On Sun, 24 Oct 2010 11:34:12 -0400
Brandon Kim brandon@brandontek.com wrote:
I wanted to open up this question regarding NTP server. I recalled
someone had created a posting of this quite awhile back.
From a service provider/ISP standpoint, does anyone think that
having a local NTP
On Sun, Oct 24, 2010 at 1:24 PM, Joel Jaeggli joe...@bogus.com wrote:
On 10/24/10 10:20 AM, Christopher Morrow wrote:
On Sun, Oct 24, 2010 at 10:44 AM, Peter Lothberg r...@stupi.se wrote:
How do you knew that your local NTP server knew what time it is? (for sure)
this question is a trap.
On 10/24/10 10:25 AM, John Kristoff wrote:
The perfect accuracy of log files might be hard to justify and
quantify.
more to the point what's the minimum resolution of a counter in a log
file, if it's 1s or 1ms it's a bit different than if it's 1us.
acquired the time from the three stratum-1 clocks, they all poll each other
for the average.
How many clocks/servers do you need to average from to knew that you
are within say 1ms of UTC(nist)?
-P
Just for log purposes and possibly providing it to our clients as an added
service at no charge of course.
I don't see us needing to get very granular in the details of the times on the
logs
Date: Sun, 24 Oct 2010 10:09:25 -0700
From: ra...@psg.com
To: brandon@brandontek.com
Looks like you have a pretty good setup. What vendor equipment are you using?
You can let me know offline so it doesn't
sound like you're advertising them
Date: Sun, 24 Oct 2010 11:03:18 -0600
From: br...@2mbit.com
To: nanog@nanog.org
Subject: Re: NTP Server
On 10/24/10 9:34 AM,
On Sun, 24 Oct 2010, George Bonser wrote:
The main reason for that is that the free servers won't remain free
if every single individual host on the Internet is hitting them. By
running your own internal servers a stratum down you offload that
traffic from the public servers and preserve that
I've had pretty good luck asking for higher MTU's on both customer and
peering links. I'd say about an 80% success rate for dedicated
GigE's.
It's generally not on the forms though, and sometimes you get what I
consider weird responses. For instance I know several providers who
won't
On Sun, 24 Oct 2010, Brandon Kim wrote:
1) How necessary do you believe in local NTP servers? Do you really
need the logs to be perfectly accurate?
2) If you do have a local NTP server, is it only for local internal
use, or do you provide this NTP server to your clients as an added
service?
3)
From: Peter Beckman
Sent: Sunday, October 24, 2010 11:33 AM
To: North American Network Operators Group
Subject: RE: NTP Server
On Sun, 24 Oct 2010, George Bonser wrote:
It sure would be nice if datacenter facilities offered an
independent
NTP
time source as a benefit for hosting
On Sun, Oct 24, 2010 at 8:34 AM, Brandon Kim brandon@brandontek.com wrote:
Hey guys:
I wanted to open up this question regarding NTP server. I recalled someone
had created a posting of this quite awhile back.
From a service provider/ISP standpoint, does anyone think that having a
On Sun, 24 Oct 2010, Christopher Morrow wrote:
How do you knew that your local NTP server knew what time it is? (for sure)
this question is a trap.
Quite.
We had 2 HP 5071s,(+ several GPS standards) and at the time being the
definition of a second, either could be correct at any time.
On 10/24/2010 2:14 PM, Steven Hill wrote:
On Sun, 24 Oct 2010, Christopher Morrow wrote:
How do you knew that your local NTP server knew what time it is?
(for sure)
Because you got the time service from an authoritative source who did
the rest of the work to make sure that the NTP evidence
On 10/24/2010 7:37 PM, Peter Lothberg wrote:
acquired the time from the three stratum-1 clocks, they all poll each other
for the average.
How many clocks/servers do you need to average from to knew that you
are within say 1ms of UTC(nist)?
What type of evidence model do you need to prove
Hi Sean:
By local I meant in-house, on-site in our datacenter. As far as what
applications could use our NTP service, I would
leave that up to each client and what they are running. For my own personal
purposes, it would just be for log purposes.
(error logs, syslogs, etc etc)
I have heard
Regarding leap seconds:
A modern OS kernel using the NTP daemon to control time will always experience
monotonic time. Negative leap seconds should result in the local clock slowing
slightly until the local time matches the NTP-derived time.
This is in strong contrast to what can happen when
Coming across Phil Dykstra's paper from 1999 is what got me thinking
about it (well, that and moving a lot of data between Europe and the
West coast of the US).
http://sd.wareonearth.com/~phil/jumbo.html
http://staff.psc.edu/mathis/MTU/
Found more good information here:
On Oct 25, 2010, at 3:48 AM, Matthew Petach wrote:
NTP can potentially be used as a DoS vector by your upstream clocks, if
you're not running your own.
+1
Also, if you experience a network partition event for any reason (DDoS attack,
backhoe attack, et. al.) which disrupts communications
Routers are not a good choice for time servers as it complicates configuration
and, to some extent, constrains deployment methodology for routers to be
effective with time service. We don't run DNS on routers, it is a service. Time
service via NTP is a service as well. The NTP daemon in a
Nowadays is not that difficult to get off the shelf solutions for
different applications.
Just to point to one:
http://www.symmetricom.com/products/ntp-servers/ntp-network-appliances/
Regards
Jorge
On Mon, 25 Oct 2010, Dobbins, Roland wrote:
On Oct 25, 2010, at 3:48 AM, Matthew Petach wrote:
NTP can potentially be used as a DoS vector by your upstream clocks,
if you're not running your own.
+1
Also, if you experience a network partition event for any reason (DDoS
attack, backhoe
Date: Sun, 24 Oct 2010 14:18:18 -0400
From: David Andersen d...@cs.cmu.edu
Subject: Re: NTP Server
(...)
If you find yourself needing really precise time with good guarantees,
you're not just talking about buying one GPS unit -- you can easily go
down a rathole of finding multiple units
On Sun, 24 Oct 2010, Cutler James R wrote:
In my experience, a reliable NTP peer group can be implemented on the
same set of boxes as DNS (bind, etc.) with little or no impact on DNS
performance. If you can count to four or more, you can make a reliable
peer group of time servers.
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