Chapter 41 Maintenance Tools

 

 

Table 153 Maintenance Tools Commands in Configuration Mode (continued)

COMMAND

DESCRIPTION

snaplen <68..1512>

Specifies the maximum number of bytes to capture per

 

packet. The NXC automatically truncates packets that

 

exceed this size. As a result, when you view the packet

 

capture files in a packet analyzer, the actual size of the

 

packets may be larger than the size of captured packets.

 

 

arp ip_address mac_address

Edits or creates an ARP table entry.

no arp ip_address

Removes an ARP table entry.

[no] arp reply restricted

Sets the NXC to only respond to ARP requests, in which

 

both the source and destination IP addresses are in

 

different subnets.

 

The no command sets the NXC to respond to any ARP

 

request.

41.1.1 Command Examples

Some packet-trace command examples are shown below.

Router# packet-trace duration 3 tcpdump: listening on eth0

19:24:43.239798 192.168.1.10 > 192.168.1.1: icmp: echo request

19:24:43.240199 192.168.1.1 > 192.168.1.10: icmp: echo reply

19:24:44.258823 192.168.1.10 > 192.168.1.1: icmp: echo request

19:24:44.259219 192.168.1.1 > 192.168.1.10: icmp: echo reply

19:24:45.268839 192.168.1.10 > 192.168.1.1: icmp: echo request

19:24:45.269238 192.168.1.1 > 192.168.1.10: icmp: echo reply

6 packets received by filter

0 packets dropped by kernel

Router# packet-trace interface ge2 ip-proto icmp file extension-filter -s -> 500 -n

tcpdump: listening on eth1

07:24:07.898639 192.168.105.133 > 192.168.105.40: icmp: echo request (DF)

07:24:07.900450 192.168.105.40 > 192.168.105.133: icmp: echo reply

07:24:08.908749 192.168.105.133 > 192.168.105.40: icmp: echo request (DF)

07:24:08.910606 192.168.105.40 > 192.168.105.133: icmp: echo reply

8 packets received by filter

0 packets dropped by kernel

 

263

NXC CLI Reference Guide