[ale] OT Routing Breakdown.

[Brian Stanaland]

I meant in case you manage to log in to the server that traceroutes to
clients might not show a problem. We had a case where customers in one
European city would get to our DC servers through New York. When we tried
to troubleshoot from our side we got to the clients directly from DC. It
wasn't until we got traceroutes from the client that we realized the
problem was the NY transit provider.

--Brian

Sent from my iPhone

On Nov 2, 2012, at 17:48, Bob Kruger <bkruger at mindspring.com> wrote:

True, but if they can not get to the hosting service server, then any
traffic coming back is a moot point.

V/r

Bob Kruger

-----Original Message-----
From: Brian Stanaland
Sent: Nov 2, 2012 5:41 PM
To: Atlanta Linux Enthusiasts
Subject: Re: [ale] OT Routing Breakdown.

Keep in mind that the route might be different each way. Client to web
server isn't always the same path as web server to client.

--Brian

On Fri, Nov 2, 2012 at 5:28 PM, mike at trausch.us <mike at trausch.us> wrote:

> On 11/02/2012 05:24 PM, Bob Kruger wrote:
>
>> I am sorry if this is OT, but I am hoping that someone in the ALE has
>> experience in solving the following problem.
>>
>> I maitain a site that is run right outside of Boston.  About 600 people
>> access the site from around the world.  Starting Saturday past, the site
>> became unreachable to over 200 users both in the United States and
>> worldwide.  The problem was most prevalent with AT&T subscribers, but
>> that may be due to the sheer number of people who use AT&T.  At first
>> the hosting service told me that AT&T was blocking the site. However,
>> conversations with AT&T level two tech support confirmed that it was not
>> blocked by them.  There had been some reports of SPAM, but that was
>> traced down to the emails that can be sent out when a user forgets their
>> password.  Some systems reject emails from "Webmaster".
>>
>> There seems to be a routing breakdown somewhere,  A user in California
>> did a traceroute to the system, and was able to take a snapshot of where
>> the routing broke down.  Neither AT&T nor the hosting service state that
>> this is their responsibility to pursue.
>>
>> So, how does one go about fixing a routing problem?
>>
>
> That depends on where the routing problem was found.
>
> Your best bet would be to get multiple traceroutes that show the failure.
>  Then you can (hopefully) see that there is a single point that is in
> common between all the traceroutes.  At that point, you need to contact
> whoever is the operator of the final system before the break (since you
> have no way to know what system comes after the break...) and work with
> them to let them know that they are having an issue with one of their
> network links.
>
> That is, of course, easier said than done.  My bet is that you're going to
> find that the road to resolution in this case is going to be a long and
> frustrating one.
>
> I've only ever had success in getting someone to fix routing problems when
> the routing problems originate (or appear to originate) from my own ISP.
>  I've not had any circumstances where I've needed to do anything else, as
> yet.
>
>         --- Mike
>
> --
> A man who reasons deliberately, manages it better after studying Logic
> than he could before, if he is sincere about it and has common sense.
>                                    --- Carveth Read, “Logic”
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-- 
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imaginary, exactly like his love of sense, justice and truth.
He is not actually happy when free; he is uncomfortable, a bit alarmed, and
intolerably lonely. Liberty is not a thing for the great masses of men.
It is the exclusive possession of a small and disreputable minority, like
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It takes a special sort of man to understand and enjoy liberty —

and he is usually an outlaw in democratic societies.

-- H.L. Mencken, Baltimore Evening Sun (12 February 1923)


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