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Troubleshooting with Debug CLI Troubleshooting IP Routing
page 12-12 OmniSwitch Troubleshooting Guide September 2005
ip-address 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.
ip-pair Use this option to match packets exchanged between two network
addresses. Enter ip-pair, then enter each IP address.
protocol 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.
show-broadcast 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.
show-multicast 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.
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