Check Point and GRUB-problems

This post serves more as a reminder to myself about Grub rather than providing new and exciting information. The /boot/grub/grub.conf file is either empty, or corrupted. Check Point FW boots into grub command prompt – Manual boot If all you can see is a grub command prompt you need to do the following to manually […]

Failing to transfer image to Cisco CAP

When trying to load an image from tftp on your computer, the lightweight AP reverts its interfaces to DHCP because it is not able to find a controller. This happen when either archive download-sw or ordinary copy tftp flash It gives off the following error CAPWAP-3-STATIC_TO_DHCP_IP: Could not discover WLC using static IP. Forcing AP […]

How to show mac addresses in TCPdump

Just a quick tip on how to display MAC addresses in the TCPdump utility. Simply use the “-e” switch. tcpdump -i INTERFACENAME -e Without the -e switch: [CheckPoint]# tcpdump -i bond2.100 -n 12:28:42.257902 IP > . ack 1831 win 513 12:28:42.258620 IP > P 1:286(285) ack 1831 win 513 With the […]

The Cisco 3650 stacking module. Not really a module.

If you ever have asked yourself the question “How can I tell if my 3650 has a stacking module installed?” or “what commands shows if there is stacking module installed“. Those questions will be addressed in this post. The short answer is: Unless the switch is already stacked with another switch and you can verify […]