
ESR service routers. ESR-Series. Functionality description. Version 1.12.0
269
Step
Description
Command
Keys
13
Enable the blocking of TCP packets,
with the SYN and FIN flags set.
esr(config)# ip
firewall screen spy-
blocking syn-fin
14
Enable the blocking of TCP packets,
with all flags or with the set of flags:
FIN, PSH, URG. The given command
provides the protection against
XMAS attack
esr(config)# ip
firewall screen spy-
blocking tcp-all-flag
15
Enable the blocking of TCP packets,
with the zero “flags” field.
esr(config)# ip
firewall screen spy-
blocking tcp-no-flag
16
Enable the blocking of fragmented
ICMP packets.
esr(config)# ip
firewall screen
suspicious-packets
icmp-fragment
17
Enable the blocking of fragmented
IP packets.
esr(config)# ip
firewall screen
suspicious-packets ip-
fragment
18
Enable the blocking of ICMP packets
more than 1024 bytes.
esr(config)# ip
firewall screen
suspicious-packets
icmp-fragment
19
Enable the blocking of fragmented
TCP packets, with the SYN flag.
esr(config)# ip
firewall screen
suspicious-packets
syn-fragment
20
Enable the blocking of fragmented
UDP packets.
esr(config)# ip
firewall screen
suspicious-packets
udp-fragment
21
Enable the blocking of packets, with
the protocol ID contained in IP
header equal to 137 and more.
esr(config)# ip
firewall screen
suspicious-packets
unknown-protocols
22
Set the frequency of notification (via
SNMP, syslog and in CLI) of
detected and blocked network
attacks.
esr(config)# ip
firewall logging
interval <NUM>
<NUM> – time interval in seconds
[30 .. 2147483647]