black listing of web traffic

Andrey Gordon andrey.gordon at
Tue Feb 9 21:47:03 UTC 2010

Can't find my IP on any of the black lists. Don't have any proxies. Sites
that behave poorly are consistent. That is to say that, would always come up without an issue, but, know, don't ask, students), would consistently take forever to come up.

Just wanted to check of rate-limiting web clients is a common practice
nowdays in the industry. If it's not, it's probably an unlikely cause of my


Andrey Gordon [andrey.gordon at]

On Tue, Feb 9, 2010 at 4:40 PM, Geoffrey Keating <geoffk at> wrote:

> Andrey Gordon <andrey.gordon at> writes:
> > Hi list
> >
> > I have a problem that I can't seem to find a solution to yet. My student
> > network is being NATted out and anyone who's on that network had troubles
> > accessing random websites.
> > For example, going to or would work
> great,
> > but would either not load or take forever to open up.
> >
> > I've had that problem last week and thought I tracked it down to the NAT
> ip
> > being black listed with one of the span black lists. Even though that IP
> is
> > not used for mail out, that somehow seemed to affect it. Changing it to a
> > different one seemed to solve the problem and I got that original address
> of
> > the list in the mean time. Changed it back and everything was well, until
> > today.
> > Same symptoms, but now I don't see us listed anywhere.
> > The best description of the symptoms seems to be that that IP is rate
> > limited or something.
> >
> > Anyone seen that? Are there any blacklists for web access?
> Could it be related to the Pushdo botnet SSL traffic generation,
> <>?
> Perhaps you have an infected machine and so your IP is being
> blacklisted and/or rate-limited.

More information about the NANOG mailing list