Limiting Pings

This scenario shows how to set or remove ICMP DDoS protection features for the Ping Flood attack.

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ICMP Enable Limit On All Echo Reply

Description

Effect of enabling ICMP DDoS protection for Ping Flood.

Scenario

Step 1: Set the following configuration in DUT0 :

set interfaces ethernet eth0 address 10.0.0.2/24
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 2: Set the following configuration in DUT1 :

set interfaces ethernet eth0 address 10.0.0.1/24
set protocols static route 20.0.0.0/24 next-hop 10.0.0.2
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 3: Ping IP address 10.0.0.2 from DUT1:

admin@DUT1$ ping 10.0.0.2 count 1 size 56 timeout 1
Show output
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=0.297 ms

--- 10.0.0.2 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.297/0.297/0.297/0.000 ms

Step 4: Ping IP address 10.0.0.2 from DUT1:

admin@DUT1$ ping 10.0.0.2 count 5 size 56 timeout 1
Show output
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=0.238 ms
64 bytes from 10.0.0.2: icmp_seq=2 ttl=64 time=0.215 ms
64 bytes from 10.0.0.2: icmp_seq=3 ttl=64 time=0.322 ms
64 bytes from 10.0.0.2: icmp_seq=4 ttl=64 time=0.221 ms
64 bytes from 10.0.0.2: icmp_seq=5 ttl=64 time=0.240 ms

--- 10.0.0.2 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4098ms
rtt min/avg/max/mdev = 0.215/0.247/0.322/0.038 ms

Step 5: Modify the following configuration lines in DUT0 :

set system ip icmp rate limit 0
set system ip icmp rate messages-burst 0
set system ip icmp rate messages-per-second 0
set system ip icmp rate type echo_reply

Step 6: Ping IP address 10.0.0.2 from DUT1:

admin@DUT1$ ping 10.0.0.2 count 5 size 56 timeout 1 interval 0.002
Show output
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.

--- 10.0.0.2 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 40ms

Attention

Depending on the architecture of the device after setting messages-burst the previous burst allowance must be spent before changes take effect, by default is set to 50.

Show output
ping 10.0.0.2 count 50 size 1 timeout 1 interval 0.002