NMAP run stages flow diagram

NMAP scanner has become over the years so friendly that it is not apparent what is going on when it runs. Below is a typicsl NMAP workflow:



Hex editor of binary files on Linux

Reading this thread on Stackoverflow http://stackoverflow.com/questions/5498197/need-a-good-hex-editor-for-linux I wondered how come with so many hex editors in Linux there is not really the best one. In Windows it is easier - the expensive WinHex or the affordable Hiew. Anyway, as to the Linux I always use Vim …



Ever wondered how much does ip addresses allocation cost to your service provier ?

Ever wondered how much does IP addresses allocation really cost to your provider? Well, that is easy. If we talk about the RIPE IP address space (majority today) then they have published their fees for PI (Provider Independent) allocations for LIRs (Local Internet Registry) which is by coincidence your ISP …



Public DNS servers open to any on the Internet

Following the good will by Google many other providers made their DNS servers available to us without any limitations as recursive resolvers. As they do not announce it widely enough you may not have heard abouth them, here is the list of these DNS servers: OpenDNS/Cisco Umbrella: 208.67 …



Linux ip route command reference by example

ip address - Manage IP address(es) on interfaces ip route - Manage routing table ip link - Link Management Interface Grouping. ip neighbor - Managing ARP table Tunnel interfaces GRE NOTE: All the commands below take effect immediately after you hit Enter, and do NOT survive reboot. ip address - Manage IP address(es …



Free public NTP servers from Google

It has passed somewhat unnoticed but Google have made available to us their free, accessible to all NTP servers. I have been using their DNS servers for years without any issues so will trust their NTP ones as well. So far works just fine. For a single server we can …



Disconnect VPN or Mobile Access or SNX user from Check Point firewall

You may need occasionally to disconnect some or all connected users from the firewall forcibly. There are few ways I can think about to do so, for example installing Security Policy clears the cached authentication of the remote users, and while it does not disconnect them it will force a …



On what Linux version do Check Point firewalls run ?

Throughout its history CheckPoint firewall changed versions and names, incorporated other products. The last, so far, evolution has been the Gaia operating system released in 2012. All this holds true of course but nevertheless the base platform for the firewall all these years has been Red Hat Enterprise Linux server …



Configure SSL protocol version used in SSL VPN by Check Point

With a lot of attention recently to the SSL protocol vulnerabilities browser vendors increase security of their SSL implementation almost daily. One of the recommendations is to use the most up to date SSL version available. Check Point for its SSL based VPNs (by the way it is the same …



Add free disk space to Check Point appliance hard disk

With previous generation of Check Point UTM appliances (so called UTM-1 which included UTM 132, 270, 450 etc.) it was a really nagging issue when firewall run out of space on its hard disk. It was especially problematic for the root partition cause it is used for update downloads, upgrade …