Signature { Large-Icmp | Large-Icmpv6 } Max-Length - HP FlexNetwork 7500 Series Command Reference Manual

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signature { large-icmp | large-icmpv6 } max-length

Use signature { large-icmp | large-icmpv6 } max-length to set the maximum length of safe ICMP
or ICMPv6 packets. A large ICMP or ICMPv6 attack occurs if an ICMP or ICMPv6 packet larger than
the specified length is detected.
Use undo signature { large-icmp | large-icmpv6 } max-length to restore the default.
Syntax
signature { large-icmp | large-icmpv6 } max-length length
undo signature { large-icmp | large-icmpv6 } max-length
Default
The maximum length of safe ICMP or ICMPv6 packets is 4000 bytes.
Views
Attack defense policy view
Predefined user roles
network-admin
mdc-admin
Parameters
large-icmp: Specifies large ICMP packet attack signature.
large-icmpv6: Specifies large ICMPv6 packet attack signature.
length: Specifies the maximum length of safe ICMP or ICMPv6 packets, in bytes. The value range for
ICMP packets is 28 to 65534. The value range for ICMPv6 packets is 48 to 65534.
Examples
# Set the maximum length of safe ICMP packets for large ICMP attack to 50000 bytes in attack
defense policy atk-policy-1.
<Sysname> system-view
[Sysname] attack-defense policy atk-policy-1
[Sysname-attack-defense-policy-atk-policy-1] signature large-icmp max-length 50000
Related commands
signature detect
signature detect
Use signature detect to enable signature detection for single-packet attacks and specify the
prevention actions.
Use undo signature detect to disable signature detection for single-packet attacks.
Syntax
signature detect { fraggle | fragment | impossible | land | large-icmp | large-icmpv6 | smurf |
snork | tcp-all-flags | tcp-fin-only | tcp-invalid-flags | tcp-null-flag | tcp-syn-fin | tiny-fragment |
traceroute | udp-bomb | winnuke } [ action { { drop | logging } * | none } ]
undo signature detect { fraggle | fragment | impossible | land | large-icmp | large-icmpv6 |
smurf | snork | tcp-all-flags | tcp-fin-only | tcp-invalid-flags | tcp-null-flag | tcp-syn-fin |
tiny-fragment | traceroute | udp-bomb | winnuke }
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