
ESR service routers. ESR-Series. Functionality description. Version 1.12.0
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Step
Description
Command
Keys
5
Enable protection against SYN flood
attacks.
esr(config)# ip
firewall screen dos-
defense
syn-flood { <NUM> }
[src-dsr]
<NUM> – maximum amount of TCP
packets with the set SYN flag per
second, set in the range of
[1..10000].
src-dst – limitation on the amount of
TCP packets with the SYN flag set,
based on the source and destination
addresses.
6
Enable protection against UDP flood
attacks.
esr(config)# ip
firewall screen dos-
defense
udp-threshold
{ <NUM> }
<NUM> – maximum amount of UDP
packets per second, set in the range
of [1..10000].
7
.Enable protection against winnuke
attacks.
esr(config)# ip
firewall screen dos-
defense winnuke
8
Enable the blocking of TCP packets
with the FIN flag set and the ACK
flag not set.
esr(config)# ip
firewall screen spy-
blocking fin-no-ack
9
Enable the blocking of various type
ICMP packets.
esr(config)# ip
firewall screen spy-
blocking icmp-type
<TYPE> – ICMP type, may take the
following values:
destination-unreachable
echo-request
reserved
source-quench
time-exceeded
10
Enable the protection against IP-
sweep attacks.
esr(config)# ip
firewall screen spy-
blocking ip-sweep
{ <NUM> }
<NUM> – ip sweep attack detection
time, set in milliseconds
[1..1000000].
11
Enable protection against port scan
attacks.
esr(config)# ip
firewall screen spy-
blocking port-scan
{ <threshold> }
[ <TIME> ]
<threshold> – interval in
milliseconds during which the port
scan attack will be recorded
[1..1000000].
<TIME> – blocking time in
milliseconds [1..1000000].
12
Enable the protection against IP
spoofing attacks.
esr(config)# ip
firewall screen spy-
blocking spoofing