Configuration Guide User guide

1084 FastIron Configuration Guide

53-1002494-02

Disabling IP checksum check

NOTE

This command is supported on FastIron X Series IPv4 devices only.

The disable-hw-ip-checksum-check command traps a packet with bad checksum to the CPU.

Previously, if the packet processor detected a packet with, for example, the checksum 0xFFFF, it

would treat it as a bad checksum even if it was correct and it would drop the packet. Now, the

command disable-hw-ip-checksum-check traps the packet at the CPU and if the checksum is

correct, it forwards the packet.

To set disable hardware ip checksum check for all ports, enter the following command.

To clear disable hardware ip checksum check on all ports, enter the following command.

To set disable hardware ip checksum check on for example, port range 0-12, enter the following

command.

To set disable hardware ip checksum check on, for example, port range 13-24, enter the following

command.

To clear disable hardware ip checksum check on, for example, port range 13-24, enter the

following command.

passive resets The number of TCP connections this device reset because the device at the other end of the

connection sent a TCP RESET message.

input errors This information is used by Brocade customer support.

in segments The number of TCP segments received by the device.

out segments The number of TCP segments sent by the device.

retransmission The number of segments that this device retransmitted because the retransmission timer for

the segment had expired before the device at the other end of the connection had

acknowledged receipt of the segment.

TABLE 191 CLI display of IP traffic statistics – Layer 2 Switch (Continued)

Field Description

Brocade# )# disable-hw-ip-checksum-check

disable-ip-header-check set for all ports

Brocade# )# no disable-hw-ip-checksum-check ethernet 13

disable-hw-ip-checksum-check cleared for ports the 13 to 24

Brocade# ))# disable-hw-ip-checksum-check ethernet 2

disable-ip-header-check set for ports ethe 1 to 12

Brocade# ))# disable-hw-ip-checksum-check ethernet 22

disable-ip-header-check set for ports ethe 13 to 24