ZyXEL Communications ZYWALL USG 20 Manual page 486

Chapter 29 ADP
Table 138 HTTP Inspection and TCP/UDP/ICMP Decoders (continued)
LABEL
TRUNCATED-HEADER
ATTACK
TRUNCATED-
TIMESTAMP-HEADER
ATTACK
486
DESCRIPTION
This is when an ICMP packet is sent which has an ICMP
datagram length of less than the ICMP header length. This
may cause some applications to crash.
This is when an ICMP packet is sent which has an ICMP
datagram length of less than the ICMP Time Stamp header
length. This may cause some applications to crash.
ZyWALL USG 20/20W User's Guide