[AusNOG] network security Question

[Joshua D'Alton]

You'll get a hundred different answers, and it'll be how 'paranoid' the
provider is and what operational requirements they have.

A 'normal' network probably doesn't need to worry about blocking, perhaps
rate limiting but likely it'd be a DDoS anyway not abuse..

Since port scanning doesn't really require ICMP any more anyway blocking
for that reason is a bit pointless. Someone who cannot troubleshoot without
ICMP might need to learn about other methods (ftp, ssh, ntp, smtp ports
often open), but it depends on the type of people you expect to have
dealings with your network.

</From the perspective of a small hosting provider, small business and
end-user troubleshooting to small to large carriers/ISPs>


On Tue, May 20, 2014 at 1:36 PM, Alex Samad - Yieldbroker <
Alex.Samad at yieldbroker.com> wrote:

> Hi
>
> Wondering what people do around
> 1) letting through icmp
>
> I like the idea of allowing icmp through, make network diagnosis a lot
> easier, but I don't want to be bomb.
> What sort of rate limiting do people think is acceptable?
> What's acceptable from client to confirm connectivity?
>
>
> 2) blacklisting ip's
>
> So I have (like a lot of others),  people port scanning look for open
> ports, what sort of levels do people actually do something about it ?
>
> I asking as an end user, but I am also curious to know what providers do.
>
> I have heard of companies blocking entire ranges, for example say china
> and/or Russia as they have no clients there. Do people do that, do ISP
> provide that service (can that be done through the auto black hole
> mechanism ?)
>
>
> Alex
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