Debug IP Packet Detail Command on CISCO Router/Switch

Command

Debug IP Packet Detail

Use

This command enables detailed IP packet debugging messages. The debugging shows detailed IP information being processed by the route. , Also, you can use an access-list to limit the debug output.

Syntax

Router#debug ip packet detail 
OR
Router#debug ip packet detail <access-list>

Example

In the below example we enable detailed IP packet debugging on R2.

R2(config)#do debug ip packet detail
IP packet debugging is on (detailed)
R2(config)#
*Mar 1 01:16:10.887: IP: s=10.1.1.2 (local), d=224.0.0.10 (FastEthernet0/0), len 60, sending broad/multicast, proto=88
*Mar 1 01:16:11.343: IP: s=10.1.1.1 (FastEthernet0/0), d=224.0.0.10, len 60, rcvd 2, proto=88
R2(config)#
*Mar 1 01:16:12.655: IP: s=10.1.1.2 (local), d=224.0.0.9 (FastEthernet0/0), len 72, sending broad/multicast
*Mar 1 01:16:12.659: UDP src=520, dst=520
R2(config)#
*Mar 1 01:16:15.523: IP: s=10.1.1.2 (local), d=224.0.0.10 (FastEthernet0/0), len 60, sending broad/multicast, proto=88
*Mar 1 01:16:15.931: IP: s=10.1.1.1 (FastEthernet0/0), d=224.0.0.10, len 60, rcvd 2, proto=88
R2(config)#
*Mar 1 01:16:16.659: IP: s=10.2.2.2 (local), d=224.0.0.9 (FastEthernet1/0), len 132, sending broad/multicast
*Mar 1 01:16:16.663: UDP src=520, dst=520
*Mar 1 01:16:17.063: IP: s=10.2.2.2 (local), d=224.0.0.5 (FastEthernet1/0), len 80, sending broad/multicast, proto=89
R2(config)#
*Mar 1 01:16:18.167: IP: s=10.2.2.3 (FastEthernet1/0), d=224.0.0.5, len 80, rcvd 0, proto=89
*Mar 1 01:16:18.491: IP: s=10.1.1.1 (FastEthernet0/0), d=224.0.0.9, len 92, rcvd 2
*Mar 1 01:16:18.495: UDP src=520, dst=520
R2(config)#
*Mar 1 01:16:19.871: IP: tableid=0, s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Loopback0), routed via RIB
*Mar 1 01:16:19.875: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:16:19.875: ICMP type=8, code=0
*Mar 1 01:16:19.879: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:16:19.883: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:16:19.883: ICMP type=0, code=0
*Mar 1 01:16:19.939: IP: tableid=0, s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Loopback0), routed via RIB
*Mar 1 01:16:19.943: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:16:19.947: ICMP type=8, code=0
*Mar 1 01:16:19.947: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:16:19.947: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:16:19.947: ICMP type=0, code=0
*Mar 1 01:16:19.947: IP: tableid=0, s=
R2(config)#10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Loopback0), routed via RIB
*Mar 1 01:16:19.947: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:16:19.947: ICMP type=8, code=0
*Mar 1 01:16:19.947: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:16:19.947: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:16:19.947: ICMP type=0, code=0
*Mar 1 01:16:19.983: IP: tableid=0, s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Loopback0), routed via RIB
*Mar 1 01:16:19.983: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:16:19.983: ICMP type=8, code=0
*Mar 1 01:16:19.983: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:16:19.983: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:16:19.983: ICMP type=0, code=0
*Mar 1 01:16:19.991: IP: tableid=0, s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Lo
R2(config)#opback0), routed via RIB
*Mar 1 01:16:19.991: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:16:19.991: ICMP type=8, code=0
*Mar 1 01:16:19.991: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:16:19.991: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:16:19.991: ICMP type=0, code=0
*Mar 1 01:16:20.343: IP: s=10.1.1.2 (local), d=224.0.0.10 (FastEthernet0/0), len 60, sending broad/multicast, proto=88
*Mar 1 01:16:20.659: IP: s=10.1.1.1 (FastEthernet0/0), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar 1 01:16:21.547: IP: s=2.2.2.2 (local), d=224.0.0.9 (Loopback0), len 132, sending broad/multicast
*Mar 1 01:16:21.551: UDP src=520, dst=520
*Mar 1 01:16:21.555: IP: s=2.2.2.2 (Loopback0), d=224.0.0.9, len 132, rcvd 2
*Mar 1 01:16:21.559: UDP src=520, dst=520
R2(config)#
*Mar 1 01:16:24.795: IP: s=10.1.1.2 (local), d=224.0.0.10 (FastEthernet0/0), len 60, sending broad/multicast, proto=88
*Mar 1 01:16:25.451: IP: s=10.1.1.1 (FastEthernet0/0), d=224.0.0.10, len 60, rcvd 2, proto=88
R2(config)#do un all
All possible debugging has been turned off
R2(config)#
*Mar 1 01:16:27.067: IP: s=10.2.2.2 (local), d=224.0.0.5 (FastEthernet1/0), len 80, sending broad/multicast, proto=89

Here we use an access-list to filter the debug output.

R2(config)#access-list 155 permit icmp any any
R2(config)#do debug ip packet detail 155
IP packet debugging is on (detailed) for access list 155
R2(config)#
*Mar 1 01:17:16.039: IP: tableid=0, s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Loopback0), routed via RIB
*Mar 1 01:17:16.043: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:17:16.047: ICMP type=8, code=0
*Mar 1 01:17:16.047: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:17:16.051: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:17:16.055: ICMP type=0, code=0
*Mar 1 01:17:16.095: IP: tableid=0, s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Loopback0), routed via RIB
*Mar 1 01:17:16.099: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:17:16.103: ICMP type=8, code=0
*Mar 1 01:17:16.103: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:17:16.107: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:17:16.111: ICMP type=0, code=0
*Mar 1 01:17:16.123: IP: tableid=0, s=
R2(config)#10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Loopback0), routed via RIB
*Mar 1 01:17:16.123: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:17:16.123: ICMP type=8, code=0
*Mar 1 01:17:16.123: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:17:16.123: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:17:16.123: ICMP type=0, code=0
*Mar 1 01:17:16.139: IP: tableid=0, s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Loopback0), routed via RIB
*Mar 1 01:17:16.139: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:17:16.139: ICMP type=8, code=0
*Mar 1 01:17:16.139: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:17:16.139: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:17:16.139: ICMP type=0, code=0
*Mar 1 01:17:16.151: IP: tableid=0, s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2 (Lo
R2(config)#opback0), routed via RIB
*Mar 1 01:17:16.151: IP: s=10.1.1.1 (FastEthernet0/0), d=2.2.2.2, len 100, rcvd 4
*Mar 1 01:17:16.151: ICMP type=8, code=0
*Mar 1 01:17:16.151: IP: tableid=0, s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), routed via FIB
*Mar 1 01:17:16.151: IP: s=2.2.2.2 (local), d=10.1.1.1 (FastEthernet0/0), len 100, sending
*Mar 1 01:17:16.151: ICMP type=0, code=0
R2(config)#

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