Alcatel OmniSwitch 6624 Troubleshooting Manual page 188

Troubleshooting with Debug CLI
ip-address
ip-pair
protocol
show-broadcast
show-multicast
The debug ip packet command syntax starts IP debugging on NI #1 to show only broadcast packets,
which will include ARPs, and then outputs them to console. For example:
-> debug ip packet start board ni 1 show-broadcast on output console
1 R 1/22 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
1 S CMM 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
1 R 1/22 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
1 S CMM 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
This should be done on the destination machine's Falcon NI; if the output shows ARP Requests from your
source IP, the issue does not lie with routing.
To stop the output, use the debug ip packet stop command syntax. For example:
-> debug ip packet stop board ni 1 show-broadcast on output console
To be more specific, we can use the debug ip packet command to look only for packets destined to our
troubled destination IP address. For example:
-> debug ip packet start ip-address 192.168.1.24 output console
1 R 1/22 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
1 S CMM 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
1 R 1/22 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
1 S CMM 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
1 R 1/22 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
1 S CMM 00d095206408->(ffffffffffff) ARP Request 192.168.1.2->192.168.1.24
To stop the output, enter the following command syntax:
-> debug ip packet stop ip-address 192.168.1.24 output console
page 12-12
Specifies an IP address to debug. The debug output will only be for
packets received from this IP address. Enter ip-address, then enter the
IP address that you want to debug.
Use this option to match packets exchanged between two network
addresses. Enter ip-pair, then enter each IP address.
Specifies a protocol type to debug. Specify tcp to debug TCP packets;
specify udp to debug UPD packets; specify icmp to debug ICMP pack-
ets; specify igmp to debug IGMP packets; specify num to numerically
specify a protocol (e.g., 89); specify all to debug all protocol types.
Specifies whether or not to display broadcast packets. Specify on to
display broadcast packets on the screen or in the log; specify off if you
do not want to display broadcast packets.
Specifies whether or not to display multicast packets. Specify on to
display multicast packets on the screen or in the log; specify off if you
do not want to display multicast packets.
OmniSwitch Troubleshooting Guide
Troubleshooting IP Routing
September 2005