Linux Windows FreeBSD Solaris CISCO routers (IOS) Juniper routers (JunOS) Ping. Many times while debugging network problems of various kinds you need to send some packets of desirable size and don’t fragment bit being set. I list below how to do it for the different equipment/OSes. Let’s …

Note: This post was written for FortiOS version 2.8 and 3.x so some commands have changed, for updated debug steps please read Failed to connect to Fortiguard servers verification and debug updated Today I encountered otherwise easy to diagnose misconfiguration only that Fortinet decided to 'hide' this parameter …

Sometimes you can't set duplex/speed settings of the Fortigate interfaces. Important note: depends on which interface you are trying to set!. Upon careful examination turns out that you can't set duplex/speed settings of 4-port switch interfaces only, i.e. Internal interface of Fortigate 60, 60M, 100A, 200A, and …

Updated: 2022 You can't really debug VPN problems with static show commands, if VPN fails to function you HAVE to see it happening real-time. Below I list few debug commands to do just that for IPSEC site-to-site tunnels in Fortigate. Here: 192.168.168.254 - IP address on the LAN …

Many times there is more than one solution to the problem, and the most obvious is not the best one. I reminded myself this when came to my care Fortigate 60 unit that was periodically blocking traffic, you know this not-saying-much system alert "..has reached connection limit" and then no …