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Black hole filtering

Black hole filtering is a technique usually used by service providers for traffic filtering without applying access-lists. The technique is very useful in mitigation of many types of DOS attacks. The idea behind Black hole filtering is very simple; just define the traffic you want to discard and configure a …

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MPLS VPN security threats

MPLS L3 VPN services is widely used nowadays by many enterprises and organizations. They provide a lot of flexibility in connecting different sites compared to L2VPN services and offloads a lot of the responsibilities from the enterprise to the provider. I have gained all my networking experience in service provider …

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Unicast Reverse Path Forwarding

In order for a router to perform its function of forwarding packets it only needs to look at the destination address of the IP packet and never at the source; this allows an attacker to send malformed IP packets using spoofed source IP address and your routers will simply forward …

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