Re: Best practice on TCP replies for ANY queries

[Carlos Vicente <cvicente.lists () gmail com>]

https://kb.isc.org/article/AA-01000


On Wed, Dec 11, 2013 at 2:17 PM, Arturo Servin <arturo.servin () gmail com>wrote:

> I think is better idea to rate-limit your responses rather than
> limiting the size of them.
>
> AFAIK, bind has a way to do it.
>
> .as
>
>
> On Wed, Dec 11, 2013 at 4:25 PM, Anurag Bhatia <me () anuragbhatia com>
> wrote:
> > Hi ML
> >
> >
> >
> > Yeah I can understand. Even DNSSEC will have issues with it which makes
> me
> > worry about rule even today.
> >
> >
> > On Wed, Dec 11, 2013 at 11:49 PM, ML <ml () kenweb org> wrote:
> >
> > > On 12/11/2013 1:06 PM, Anurag Bhatia wrote:
> > > > I am sure I am not first person experiencing this issue. Curious to
> hear
> > > > how you are managing it. Also under what circumstances I can get a
> > > > legitimate TCP query on port 53 whose reply exceeds a basic limit of
> less
> > > > then 1000 bytes?
> > >
> > > I'm not a DNS guru so I don't have an exact answer.  However my gut
> > > feeling is that putting in a place a rule to drop or rate limit DNS
> > > replies greater than X bytes is probably going to come back to bite you
> > > in the future.
> > >
> > > No one can predict the future of what will constitute legitimate DNS
> > > traffic.
> >
> >
> > --
> >
> >
> > Anurag Bhatia
> > anuragbhatia.com
> >
> > Linkedin <http://in.linkedin.com/in/anuragbhatia21> |
> > Twitter<https://twitter.com/anurag_bhatia>
> > Skype: anuragbhatia.com