[TriLUG] What does he mean?

[James Jones]

Thanks Kevin,

Now, I will mull all of this over and send some & maybe all of it to
my brother in Florida. That should put all this to rest :-)

And you can bet I will be reading up on BGP. I was reading a small
portion about it from a sample chapter from a  book on Oreilly's
website, not knowing that it was related.

I appreciate the information.

jcj KK4VUS

On Sat, Mar 15, 2014 at 10:29 PM, Kevin Otte <nivex at nivex.net> wrote:
> I wonder if the acronym soup got messed up and he meant BGP routing issue.
> The large players on the Internet are organized in Autonomous Systems
> (ASes), each of which announce to each other what IP addresses it has within
> it.
>
> If you want to get a feel for how these systems are connected, you can visit
> http://bgp.he.net/ and put an IP address in the search field. It will come
> back with which AS is announcing that prefix. Click on the AS number for
> more information.
>
> In your example I find that one of bbc.com's IP addresses
> 212.58.244.18 is being announced by AS2818. In the details page you can
> click one of the Graph tabs and see how the ASes are hooked together.
>
> There are any number of ways in which this can go wrong. The interconnection
> between two ASes can accidentally get severed and the route to where you're
> going can become too long or completely unavailable. An AS may stop
> announcing a prefix that it is supposed to be, or it may start announcing a
> prefix that it is not supposed to be. Such errors are usually detected
> fairly quickly and put right, but not before their effects are felt pretty
> widely. Google appeared to drop off the 'net briefly a couple times: in 2008
> when a Pakistani ISP started announcing their prefixes in an attempt to
> censor them [http://www.renesys.com/2008/02/pakistan-hijacks-youtube-1/],
> and again in 2012 when a router at an Indonesian ISP went mega-sideways
> [http://blog.cloudflare.com/why-google-went-offline-today-and-a-bit-about].
>
> After looking at all this, one might conclude that it's a miracle the
> Internet works at all. I agree. It's a wondrous miracle of human achievement
> that I hope continues to grow and prosper for years to come.
>
> -- Kevin
>
>
> On 03/15/2014 09:59 PM, James Jones wrote:
>>
>> Hi,
>>
>> Recently Comcast had a problem. From anywhere within their network
>> system, you could not access bbc.com/news. My brother emailed me about
>> it. I am on Uverse plus I have access to Time Warner and a server in
>> the cloud ( not sure of isp on that one ). I had no problem accessing
>> bbc.com on Uverse and time warner. Eventually, I ended up on a comcast
>> forum which had many users complaining about no bbc access.
>>
>> At one point, Jlivingood, a moderator of the forum, came forward with
>> this remark:
>>
>> "This is some kind of TBD routing issue. We are investigating it now.
>> JL
>> National Engineering & Technical Operations "
>>
>> And later -- he wrote, " Appears a connected network was announcing a
>> bad route, which we are now ignoring until we get to the bottom of
>> this. Should be resolved right now, but still chasing root cause on
>> the bad / erroneous announcement."
>>
>> Soon after this comment, my brother in Florida on comcast, wrote that
>> bbc was back on comcast.
>>
>> I would like to understand what Jason Livingood means by "a connected
>> network was announcing a bad route". I am assuming the TBD means "to
>> be decided". If there is another meaning for that, please chime in.
>>
> --
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-- 
Jc Jones
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