What is DoS attack? How can it be prevented?

DoS (Denial of Service) attack can be generated by sending a flood of data or requests to a target system resulting in a consume/crash of the target system’s resources. The attacker often uses ip spoofing to conceal his identity when launching a DoS attack.

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How to modify SSH/HTTP/Telnet time out in Cisco ASA firewall?

How to modify SSH/HTTP/Telnet time out in Cisco ASA firewall? By default tcp idle timeout is 1:0:0 hh:mm:ss. If in case you need to modify it you can do it by MPF (Modular Policy Framework). Let us setup a custom timeout when traffic is coming from particular host 10.77.241.129. !— Match the traffic using the access-list —! object-group service DM_INLINE_TCP_1 tcp port-object eq www port-object eq ssh port-object eq telnet access-list outside_mpc extended permit tcp host 10.77.241.129 <source ip> any object-group DM_INLINE_TCP_1 !— Define the class map Cisco-class –! class-map Cisco-class match access-list outside_mpc !— Call this class-map into policy map and set the connection reset after 10 min when traffic is coming from particular host —! policy-map Cisco-policy class Cisco-class set connection timeout idle 0:10:00 reset !— Apply the policy-map Cisco-policy on the interface. —! service-policy Cisco-p...

Checkpoint firewall common commands part 2

Checkpoint firewall common commands part 2 For basic firewall informaton gathering: fgate stat -Status and statistics of Flood-Gate-1. fwaccel <stat|stats|conns> – View status, statistics or connection table of SecureXL. fw getifs -Show list of configured interfaces with IP and netmask. cpstat <app_flag> [-f flavour] -View OS, HW and CP application status. Issue cpstat without any options to see all possible application flags <app_flag> and corresponding flavours. Examples: cpstat fw -f policy – verbose policy info cpstat os -f cpu – CPU utilization statistics cpinfo -y all -List all installed patches and hotfixes. cpd_sched_config print -Show task scheduled with CPD scheduler. enabled_blades -View enabled software blades avsu_client [-app <app>] , get_version <app> -Get signature version and status of content security .Without the -app option “Anti Virus” is used. show co...

CLI Commands for Troubleshooting FortiGate Firewalls

CLI Commands for Troubleshooting FortiGate Firewalls 2015-12-21 Fortinet , Memorandum , Network Cheat Sheet , CLI , FortiGate , Fortinet , Quick Reference , SCP , Troubleshooting Johannes Weber This blog post is a list of common troubleshooting commands I am using on the FortiGate CLI . It is not complete nor very detailled, but provides the basic commands for troubleshooting network related issues that are not resolvable via the GUI. I am not focused on too many memory, process, kernel, etc. details. These must only be used if there are really specific problems. I am more focused on the general troubleshooting stuff. I am using it personally as a cheat sheet / quick reference and will update it from time to time. Coming from Cisco, everything is “show”. With Fortinet you have the choice confusion between show | get | diagnose | execute . Not that easy to remember. It is “ get router info6 routing-table” to show the routing table but “ diagn...

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