Packet Tracer
packet-tracer inputpacket-tracer input external tcp 11.22.33.44 1010 55.66.77.88 80
VPN Example
packet-tracer input internal udp 10.10.10.10 500 10.20.20.20 500 packet-tracer input internal udp 10.20.20.20 500 10.10.10.10 500
Packet Capture
capture *NAME_OF_CAPTURE* interface *INTERFACE_NAME* match *TRANSPORT_PROTOCOL (TCP / UDP / IP)* host X.X.X.X (This is the source IP address) host Y.Y.Y.Y (This is the destination IP address) eq *PORT_NUMBER* capture cap1 interface external match tcp host 11.22.33.44 host 55.66.77.88 eq 80
Capture all syslog traffic to 10.10.10.10
capture cap2 interface internal real-time match udp any host 10.10.10.10 eq 514
View capture
show capture cap1
Show access-list
show access-list acl_external
Find access-list entries including port 514
show access-list | inc 514
Find log entries including port 514
show logging | inc 514
Show arp for specific interface
show arp | inc internal