Filtering is done for ICMP, 92 Bytes which W32/Nachi.worm is using
http://vil.nai.com/vil/content/v_100559.htm

> 2) unacceptable, cause they no more deliver "full" internet access.

Yes, they should rather inform the customer how to prevent this.

> 3) acceptable if they would have told their customers in advance.

In case if it is an emergency  they should inform the customer and set a 
temp rule which could be remove by ISP request.

> They told us, they did that to filter some worms. I can understand
> this, but we're an ISP and IMHO the filtering should be done at the
> edge of internet not in the core...

That is the exactly case, it have to be optional  !

-- 
* Erich Hohermuth IP Engineer - SolNet (AS 9044) PGPKEY-46A08FCB *

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