Spamming and ssh attack from a customers

Mike mike-nanog at
Thu Jan 6 02:26:24 CST 2011

On 01/06/2011 12:21 AM, Tarig Ahmed wrote:
> hi all
> I am receiving emails from many servers saying that: this ip (from a
> customer) is trying to attacking one of our servers.
> Is it appropriate to filter ssh, telnet, and smtp from my customers, or
> just forward the message to my customer contact persons?

Depends on your acceptable use policy and terms of service. I would say 
trying to micromanage the ip protos being used for these attacks is just 
creating work for you - if they are the source, and you have credible 
reports, then the customer should be notified and they should commit to 
resolving the problem. If they won't or aren't able to respond 
effectively, I would say that (depdning on the who and what of your 
customer), shutting down the port may be a viable next step.


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