Users Guide

• ICMP Replies

• IP ID Values Randomness

You can congure the Dell EMC Networking OS to drop ICMP reply messages. When you congure the drop icmp command, the

system drops the ICMP reply messages from the front end and management interfaces. By default, the Dell EMC Networking OS responds

to all the ICMP messages. You can congure the Dell EMC Networking OS to suppress the following ICMPv4 and ICMPv6 message types:

Table 6. Suppressed ICMPv4 message types

ICMPv4 Message Types

Echo reply (0)

All sub types of destination unreachable (3)

Source quench (4)

Redirect (5)

Router advertisement (9)

Router solicitation (10)

Time exceeded (11)

IP header bad (12)

Timestamp request (13)

Timestamp reply (14)

Information request (15)

Information reply (16)

Address mask request (17)

Address mask reply (18)

NOTE: The Dell EMC Networking OS does not suppress the ICMPv4 message type Echo request (8).

Table 7. Suppressed ICMPv6 message types

ICMPv6 Message Types

Destination unreachable (1)

Time exceeded (3)

IPv6 header bad (4)

Echo reply (129)

Who are you request (139)

Who are you reply (140)

Mtrace response (200)

Mtrace messages (201)

1704 Security