We're seeing frequent dropped packets between ATT and Level 3 in Atlanta
with traffic sourced from an ATT user destined for Microsoft Office 365,
making Office 365 apps unusable during critical business hours. Anyone else
have this problem with ATT?
I suspect random packet loss between an Xfinity (Comcast) cable modem user
in Atlanta, and our Chandler, Az data center. Traceroute between the
Atlanta user and Chandler shows Comcast/TW backbone handing off to
Abovenet/Zayo, finally to Internap for local loop connection. Can anyone
verify this?
Can someone from Cox reply to me offline regarding a Cox routing issue in
Omaha? Both ends of connection are on Cox network, but a traceroute shows
packets being routed into Level 3 at 4.35.186.61 24 msec 24 msec 24 msec,
and blackholed in Level 3 network.
David Holmes
Many years ago the standard books on application network programming were
based on C language. Books such as "Adventures in UNIX Network
Programming", and Professor Comer's "Internetworking with TCP/IP Vol 3"
detailed how to write C programs using BSD sockets where binding to a
socket brought the p
Does anyone know of any problems in Hawaii with email or DNS problems?
Sending from gmail.com and pacbell.net domains, I get:
host mail.hawaiilink.net[24.43.223.114] said: 553
5.1.8 emailaddr...@pacbell.net ... Domain of sender address
emailaddr...@pacbell.net does not exist (in reply to
My experience with one of the big 2 telcos in the USA is unbelievable even
now looking back a few months:
1. at my key network monitoring site telco Northern Telecom (before NT
changed their name to Nortel) SONET equipment circa 1995 kept failing,
taking legacy circuits down hard.
2. Escalating th
The Australian NBN plan evolved because, when the Australian government put
out the original RFP, the incumbent telcos wanted anti-competitive
commitments in exchange for their build-out efforts (sound familiar here in
the USA?). The Australian government deemed the original telco RFP replies
as "n
Perhaps I missed a reference to receiver sensitivity in this thread. Since
the receiver optical-electric components are binary in nature, received
optical dB only has to be equal to or greater than the receiver's
sensitivity. Low or high dB received light produces the same quality at the
receiver.
Technically, any of the architectures espoused by some of the commentators
on this thread will work, and would at least be an order of magnitude
better than what is available in the local loop today.
One of the commentators, however, did underscore the biggest challenge by
far to national broadban
The Metro Ethernet Forum (MEF) develops standards for Metro Ethernet, which
are generally implemented by telcos/cablecos. See the following link:
http://metroethernetforum.org/
The 2 biggest problems I have found with telco/cableco MEF services are:
1. In network configurations where all sites a
Does anyone have experience in running fiber optic cable with
micro-trenching techniques in areas where there is no existing asphalt or
concrete roadway, just packed earth and rock? Environmental limitations do
not allow for constructing an aerial power pole alignment, or underground
ductbank. The
I'm looking for experiences with Cisco ASR1001 as a border router,
specifically BGP stability, # full BGP feeds (with 4 GB DRAM), does it
perform according to wire speed acl/firewall/deep packet inspection
specifications.
david
-- Forwarded message --
From: david peahi
Date: Tue, Mar 6, 2012 at 9:47 AM
Subject: Re: VLAN Troubles
To: Alan Bryant
Why don't you replace the Dell switches with Cisco 3560s, and that way you
are working with a single implementation of the IEEE 802.1q trunking
standa
I also would be interested in any information. It looks like MEF recognizes
4 training companies:
http://metroethernetforum.org/page_loader.php?p_id=1577
One company offers just 1 class then an exam for certification.
On Fri, Mar 9, 2012 at 9:54 AM, Andy Susag wrote:
> Hi All,
>
>
>
> It seems
What is the SLA for FIOS? I believe that FIOS uses either PON or GPON
technology where a single data wavelength is split up to 32 times resulting
in a shared pipe back to the CO. Does Verizon offer any SLA at all for FIOS?
On the other hand Verizon Wireless offers BGP peering for business
customer
I have discovered that the Federal School Lunch E-Rate program has built
out an entirely parallel fiber optic infrastructure in the USA, bypassing
telco fiber in many urban areas such as Los Angeles/Southern California.
There are now companies that exist solely to construct E-Rate fiber.
Sunesys is
Yesterday at about 3 pm PDT DNS resolution problems were experienced
through Centurylink. Apparently their Phoenix DNS servers were unreachable
for some time. These types of incidents never happened with Qwest. Anyone
else report a service degradation since Centurylink took over?
On Tue, Apr 24, 2
We use 1X/EVDO for telemetry polling, but find that the latency is very
high with VZW to Verizon wired networks located in east Texas, so if your
network is on the west coast, every packet traverses the US continent twice
even though the endpoints may be less than 100 miles (or even 1 mile)
apart.
I'm fortunate to have a /16, and advertise 2 /18s from the primary, and 4
/17s from the backup collo, /16 from both with AS Prepend on backup /16,
and depend on BGP longest prefix route selection to create symmetric
Internet routing back to my locations. I run IBGP between geographically
diverse lo
Can anyone comment on Cisco 6509E Smartnet "chassis" coverage? In the past,
"chassis" has always meant, not just the passive chassis itself, but all of
the components including supervisor cards, line cards, power supplies, fan
trays, etc. Now it appears that Cisco is requiring Smartnet coverage on
assis, supervisor, fans, and power supplies are covered under the
> chassis contract then the pricing on the chassis contract makes sense.
>
> Curtis
>
> -Original Message-
> From: david peahi [mailto:davidpe...@gmail.com]
> Sent: Wednesday, June 20, 2012 12:02 AM
The 7200 architecture dates from the late 1990s, and is basically modeled
on a PCI-bus UNIX workstation from that era. The 7200 is usable today as a
WAN aggregation router for T1 access, and nothing else. Using it as a GiGE
transit router will place a non-deterministic node in the network, unable
t
In my neck of the woods, critical locations often exist "in the middle of
nowhere", resulting in underserved facilities, where best effort networks
such as metro Ethernet cannot be trusted to remain available 24x7x365. Many
times, during prime business hours, I will see a telco metro Ethernet
span
Those who argue that IPv4 addresses must be reclaimed seem to have
forgotten that even for small organizations, converting IPv4 address space
to RFC1918 addresses, or IPv6, is a huge task given the fixed IP addresses
of many devices (printers, copy machines, etc.), and even worse, the many
key bus
I have used BRIX active measurement for IP for many years, but here is a
link that describes BRIX in conjunction with ADVA for Ethernet probes.
There is an article in IEEE Communications Magazine circa 2004-2005 by AT&T
researchers describing their roll your own active measurement system,
theoreti
In the USA the Federal School Lunch program has built out a parallel fiber
network equal to or superior to telco fiber in many urban locations, under
the E-Rate program. TheE-Rate backbone fiber is leased typically on a
10-20 year IRU basis. Sunesys is a provider of dark fiber, and their web
site
Anyone have experience with Cisco 6509E/SUP32 crashing under heavy SNMP
polling load, causing high cpu utilization and 6509 lockup, requiring 6509
reboot? CatOS is deployed. Is the behavior any different with 6509 IOS?
David
-- Forwarded message --
From: david peahi
Date: Thu, Nov 15, 2012 at 12:15 PM
Subject: Re: MPLS acceptable latency?
To: Mikeal Clark
Assuming no configuration errors, this underscores the need to negotiate
SLAs, and serious SLA penalties, with the telcos, and to always request
Sluggish Internet via TWC and Sprint 3G/4G in Marina Del Rey area. Any
outages reported?
Regards,
David
Apologies for making what could be construed as an off topic, political
comment, but doesn't everyone in the USA know by now that the PRC
represents a dagger aimed at the economic and national security of America?
A military invasion in slow motion as it were?
David
On Thu, Jun 13, 2013 at 12:28
Last I heard NANOG stands for North American Network Operators Group.
Anti-American comments are not welcome here..
David
On Thu, Jun 13, 2013 at 1:36 PM, Jeroen Massar wrote:
> On 2013-06-13 13:01, david peahi wrote:
> > Apologies for making what could be construed as an off topic,
I have had success with the opposite approach using equipment rated from
-40 C to +85 C (+185 F), no fans, sealed NEMA4 or NEMA12 Hoffman
enclosures, cooling by equipment heat sinks. Ethernet switches and optics
rated -40 C to +85 C
This configuration has worked with the same equipment for at least
We have used the Avocent console/power terminal servers for several years.
Although the browser interface is cluttered, and the use of Java sometimes
poses connectivity challengesm Avocent is a useful console server for all
types of devices, and has the ability to remotely power-cycle AC and DC
dev
Any comments on live action Cisco qos configurator would be appreciated
Regards
David
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