Category Archives: Troubleshooting

Security insight: Cracking WPA2 and fun with Meterpreter

So my wife wasn’t well for most of the weekend and the kids are busy doing their stuff.  So I got some time to play around 🙂 on my home lab. – so here’s the thing: It took me less than 5 mins to obtain a WPA2 handshake and less than 5 seconds to bruteContinue reading “Security insight: Cracking WPA2 and fun with Meterpreter”

Reset Cisco IP Phone(7962) to the Factory Default

Complete these steps: Unplug the power cable from the phone, and then plug in the cable again. The phone begins its power up cycle. Immediately press and hold# and while the Headset, Mute, and Speaker buttons begin to flash in sequence, release #. The line buttons flash in sequence in order to indicate that the phoneContinue reading “Reset Cisco IP Phone(7962) to the Factory Default”

Troubleshooting Cisco ASA 5500 Firewalls

How to view interfaces and descriptions? #show nameif How to remove the entire access list? # clear config access-list <ACL-Name> –There are many things you can delete with the clear config command, be careful with how you use this command. How to view the interface name, IP address and state of the interface, similar toContinue reading “Troubleshooting Cisco ASA 5500 Firewalls”

Creating a SPAN session on a Nexus 9K

Create SPAN session ================================= 9kswitch# conf t 9kswitch(config)# monitor session 1 Configure destination port (destination cannot be a FEX port or a Port-channel!) ================================= 9kswitch# conf t 9kswitch(config)# interface eth 1/15 9kswitch(config-if)# switchport monitor 9kswitch(config-if)# exit 9kswitch(config)# monitor session 1 9kswitch(config-monitor)# destination interface eth 1/15 Configure source port (or VLAN) ================================= 9kswitch(config-monitor)# source interface ethContinue reading “Creating a SPAN session on a Nexus 9K”

Ethanalyzer

Here’s some useful ‘built-in’ Wireshark capability, for troubleshooting on the supervisor. The feature only works with process switched traffic. nexus#ethanalyzer local interface inband capture-filter  “udp port 161” nexus#ethanalyzer local interface inband capture-filter  “udp port 161” detail nexus#ethanalyzer local interface inband capture-filter “udp port 161” write bootflash:snmp.pcap An ACL log is necessary to capture data plane traffic.  Steps for this canContinue reading “Ethanalyzer”

Outlook 2016 and Win 10 – Unable to send SMTP

I ran into this issue where SMTP would not send from within Outlook 2016 running on Win 10, tried every known configuration of SMTP; both encrypted and unencrypted with the same outcome. I used the System File Checker by right clicking on the Start button and selecting Command Prompt (Admin). (You’ll need to click Yes to allow it toContinue reading “Outlook 2016 and Win 10 – Unable to send SMTP”

Handy NetFlow Commands

show ip flow interface displays the NetFlow configuration for an interface show ip cache flow Verify that Netflow is operational and display summary of NetFlow statistics. show ip cache verbose flow Used to verify that NetFlow is operational and to display the detailed summary of NetFlow statistics. show ip flow export Use this command to displayContinue reading “Handy NetFlow Commands”