How do I stop someone from saturating my line & wasting CPU cycles

Posted by JoshRibs on Server Fault See other posts from Server Fault or by JoshRibs
Published on 2013-10-30T18:47:48Z Indexed on 2013/10/31 9:57 UTC
Read the original article Hit count: 238

Filed under:

linux

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networking

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firewall

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iptables

My web host shows inbound & outbound traffic with mrtg. I have a steady 3.5mbps inbound traffic from Nigeria. Even assuming the source IPs & destination ports are blocked with Iptables & verifying nothing is listening on those ports, will the traffic still always pass through the switch & "get" to my server (where my server wastes CPU cycles "dropping" the packets)? Assuming I was setup with a hardware firewall, the traffic would still show in mrtg assuming the firewall is behind the switch?

So is there any way to stop someone from saturating your 100mbps line, if they also have a 100mbps line? Other than filing an abuse complaint with the kind folks in Nigeria?

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