Checkpoint   Checkpoint – Custom application signature ACST



This time I show you the Checkpoint “Application Control Signature Tool”. This tool allows you to create your own Apps and URL filtering signatures.
For example, I’m using it to block Torrent clients based on the User-Agent, but it is very versatile and you can use it in many ways.

Downloading the tool

Visit the following SK103051 and download it. … Read more

Security   Security – View HTTP headers using tcpdump



If you need to trace the HTTP request and response headers by capturing the related packets, you can use tcpdump in this way:

 tcpdump -i ens192 -A -s 10240 'tcp port 80' | grep -v IP | egrep --line-buffered "..(GET |\.HTTP\/|POST |HEAD )|^[A-Za-z0-9-]+: " |sed -r 's/..(GET |HTTP\/|POST |HEAD )/\n\n\1/g'

For example, filtering tcp port 80 and 192.168.10.100 IP address:… Read more

Checkpoint   Checkpoint – VSX Virtual Memory full – Enable 64 bit



Symptoms

I manage a 2 node VSX clusterXL environment that hosts 3 firewalls (virtual systems).
Some days ago I came across a problem in which one of them started  (or maybe more time ago but not aware) to experience bad performance, outages, timeouts…

Trying to make a failover and move the VS to the other node fixed the problem until … Read more

Checkpoint   Checkpoint – Database Revision Control



“Database Revision Control” is a really useful feature when you are going to make important and/or many changes in the firewall policy, objects…

To make an analogy, DRC are like snapshots (as in the case of VMWare of a virtual machine) of the policies, objects, etc … everything that contains the database of the management server of Checkpoint is backed … Read more

Checkpoint   Checkpoint – dropped Reason: UDP packet that belongs to an old session



Problem

Last week I came across a DHCP problem. Devices from certain VLAN were not getting DHCP assigned IP.

Even though firewall policy should have accepted those packets, tcpdump showed Checkpoint gateway was not forwarding them to the destination.

To capture DHCP traffic:

# tcpdump -n -i <interface> port 67 or port 68 -e

Incoming interface DHCP tcpdump:

# tcpdump 
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Checkpoint   Checkpoint – Incrementing virtual system instances to solve cpu overload



Due to some network infrastructure changes, the traffic passing through my internal FW (a Checkpoint VSX virtual system) started to suffer latency and packet loss.

No change had been made to the Checkpoint VSX, but for any reason, since that network changes, Checkpoint was not processing the traffic succesfully.

Performing a top on the VSX appliance containing the active “iNTERNAL … Read more

Checkpoint   Checkpoint VSX: Force VS failover



There are several reasons to force a failover on a firewall cluster (in this case a virtual system on a 2 node Checkpoint VSX cluster). For example, testing, analyzing or maintenance purposes.

First of all, we can check the cluster and virtual systems states by executing the command on the VS0 (on Gaia clish or expert mode):

[Expert@vsx1:0]# cphaprob 
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