Archive for February, 2014

ICMP Firewalling Done Right

by Jason Stewart
Most enterprise firewalls block all traffic not explicitly allowed by a rule. Because of this, people often fail to make proper allowances for ICMP in their firewall rules. The IETF has a great set of guidelines on ICMP filtering here: Some network guys will say, “I don’t want this server to be pinged or […]

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