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Re:Blacknurse – Low bandwidth ICMP firewall attack by peterwwillis on Monday November 14, 2016 @04:58PM (#12953742)
Mitigating control plane attacks on Cisco devices: http://itsecurity.telelink.com/control-plane-attack/

Control plane security overview: http://www.cisco.com/c/en/us/products/collateral/security/io...

Control plane best practices: http://www.cisco.com/c/en/us/about/security-center/copp-best...

Protecting the Router Control Plane: https://tools.ietf.org/html/rfc6192

You'll probably also want to read the Network Security Baseline: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Se...

More resource exhaustion DoS: TTL expiry attack http://www.cisco.com/c/en/us/about/security-center/ttl-expir...

Troubleshooting high CPU use (on 7500's) http://www.cisco.com/c/en/us/support/docs/routers/7500-serie...

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