Reference Guide

642 | IPv4 Routing
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Example
Figure 24-3. debug ip packet Command Example (Partial)
Usage
Information
Use the count option to stop packets from flooding the user terminal when debugging is turned on.
The access-group option supports only the equal to (eq) operator in TCP ACL rules. Port operators
not equal to (neq), greater than (gt), less than (lt), or range are not supported in access-group
option (see Figure 24-4). ARP packets (arp) and Ether-type (ether-type) are also not supported in
access-group option. The entire rule is skipped to compose the filter.
The access-group option pertains to:
• IP Protocol Number 0 to 255
Table 24-1. debug ip packet Command Example Fields
Field Description
s= Lists the source address of the packet and the name of the interface (in
parentheses) that received the packet.
d= Lists the destination address of the packet and the name of the interface
(in parentheses) through which the packet is being sent out on the
network.
len Displays the packet’s length.
sending
rcvd
fragment
sending broad/multicast proto
unroutable
The last part of each line lists the status of the packet.
TCP src= Displays the source and destination ports, the sequence number, the
acknowledgement number, and the window size of the packets in that
TCP packets.
UDP src= Displays the source and destination ports for the UDP packets.
ICMP type= Displays the ICMP type and code.
IP Fragment States that it is a fragment and displays the unique number identifying the
fragment (Ident) and the
offset (in 8-byte units) of this fragment
(fragment offset) from the beginning of original datagram.
IP: s=10.1.2.62 (local), d=10.1.2.206 (Ma 0/0), len 54, sending
TCP src=23, dst=40869, seq=2112994894, ack=606901739, win=8191 ACK PUSH
IP: s=10.1.2.206 (Ma 0/0), d=10.1.2.62, len 40, rcvd
TCP src=0, dst=0, seq=0, ack=0, win=0
IP: s=10.1.2.62 (local), d=10.1.2.206 (Ma 0/0), len 226, sending
TCP src=23, dst=40869, seq=2112994896, ack=606901739, win=8192 ACK PUSH
IP: s=10.1.2.216 (Ma 0/0), d=10.1.2.255, len 78, rcvd
UDP src=0, dst=0
IP: s=10.1.2.62 (local), d=10.1.2.3 (Ma 0/0), len 1500, sending fragment
IP Fragment, Ident = 4741, fragment offset = 0
ICMP type=0, code=0
IP: s=10.1.2.62 (local), d=10.1.2.3 (Ma 0/0), len 1500, sending fragment
IP Fragment, Ident = 4741, fragment offset = 1480
IP: s=40.40.40.40 (local), d=224.0.0.5 (Gi 4/11), len 64, sending broad/multicast
proto=89
IP: s=40.40.40.40 (local), d=224.0.0.6 (Gi 4/11), len 28, sending broad/multicast
proto=2
IP: s=0.0.0.0, d=30.30.30.30, len 100, unroutable
ICMP type=8, code=0
IP: s=0.0.0.0, d=30.30.30.30, len 100, unroutable
ICMP type=8, code=0