LPI
202-450 · Question #49
A server is being used as a smurf amplifier, whereby it is responding to ICMP Echo-Request packets sent to its broadcast address. To disable this, which command needs to be run?
The correct answer is D. echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts. You've hit your weekly limit · resets 5am (America/New_York)
213 System Security
Question
A server is being used as a smurf amplifier, whereby it is responding to ICMP Echo-Request packets sent to its broadcast address. To disable this, which command needs to be run?
Options
- Aifconfig eth0 nobroadcast
- Becho "0" > /proc/sys/net/ipv4/icmp_echo_accept_broadcasts
- Ciptables -A INPUT -p icmp -j REJECT
- Decho "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
- Eecho "1" > /proc/sys/net/ipv4/icmp_echo_nosmurf
How the community answered
(61 responses)- A15% (9)
- B2% (1)
- C8% (5)
- D70% (43)
- E5% (3)
Explanation
You've hit your weekly limit · resets 5am (America/New_York)
Topics
#smurf attack#ICMP broadcast#/proc/sys#DoS prevention
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