Where are static bogon filters appropriate? was: 18.104.22.168/16 Bogons
swmike at swm.pp.se
Tue Mar 6 17:02:06 UTC 2007
On Sun, 4 Mar 2007, Sean Donelan wrote:
> When customers misconfigure their router, e.g. wrong BGP neighbor or
> ASN, wrong interface IP address, exceed max prefix limit, etc; don't
> they lose Internet connectivity until they fix it?
> A properly configure router should never forward even a single bad
> packet. If it does, isn't it likely to have configuration problems so
> why continue to keep misconfigured routers connected?
> Customers are unlikely to fix problems which don't cause them to lose
Even though the BOFH in me agrees with you, I also know that every cent on
my paycheck comes from the customers, so I prefer not to treat them like
crap. If I can protect the internet from my customers by doing uRPF or
source IP based filtering, I achieve the same thing as you but with less
Also, all the examples you give implies a BGP transit customer. I am
imagining all kinds of customers, from colo customers where I am their
default gateway, to residential customers where it's the same way.
Disabling their port and punting them to customer support is NOT a cost
efficient way of dealing with the problems, at least not in the market I
Mikael Abrahamsson email: swmike at swm.pp.se
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